Zootaxa 4751 (2): 257–275 ISSN 1175-5326 (print edition) Article ZOOTAXA https://www.mapress.com/j/zt/ Copyright © 2020 Magnolia Press ISSN 1175-5334 (online edition) https://doi.org/10.11646/zootaxa.4751.2.3 http://zoobank.org/urn:lsid:zoobank.org:pub:D0ADB14D-1A73-4325-859F-570EA2042F23 Taking a closer look: an SEM review of Levinsenia species (Polychaeta: Paraonidae) reported from California LAWRENCE L. LOVELL1,2 & KIRK FITZHUGH² 1Dancing Coyote Environmental PO Box 781 Pauma Valley, CA 92061, USA. E-mail: [email protected] 2Natural History Museum of Los Angeles County 900 Exposition Blvd Los Angeles, CA 90007 USA. E-mail: [email protected] Abstract Scanning electron (SEM) and light microscope examinations of members of Levinsenia Mesnil, 1897, species from California yielded a new species, new characters, emended name and range extension for L. kirbyorum Lovell, 2002. Specimens of L. gracilis (Tauber, 1879) from Sweden, Iceland, and California were compared and could not be distinguished on the basis of morphology. Two other Californian species, L. multibranchiata (Hartman, 1957) and L. oculata (Hartman, 1957), were also examined. SEM revealed features previously undescribed for the genus. Additional prostomial ciliary bundles, dorsal transverse ciliary branchial connections, notopodial sensory pores, and neurochaetal fascicle configurations. Levinsenia barwicki n.sp. possessing a terminal sensory organ, 4-8 leaf-like ciliate branchiae, and recurved neurochaete with distal hood is described More SEM work is necessary to confirm if these features are present among other members of Levinsenia and other Paraonidae genera. The status of Levinsenia according to the phylogenetic analysis performed by Langeneck et al. (2019, Molecular Phylogenetics and Evolution, 136, 1-13) is discussed. Key words: Annelida, new species, range extension, neurochaetae, new characters, notopodial sensory pores Introduction The type species of Levinsenia Mesnil, 1897, was designated as Aonides gracilis Tauber, 1879, by Melville (1979). In the same paper, Tauberia Strelzov, 1973, was placed into synonymy with Levinsenia. Periquesta Brito & Núñez, 2002, was placed into synonymy with Levinsenia by Giere et al. (2007). The World Polychaete Database (Read & Bellan, 2013) currently lists 22 valid species in Levinsenia while Blake (2016) lists two additional species L. jo- ponica Imajima, 1973 (as a subspecies of L. gracilis) and L. pycnobranchiata (Fauchald, 1972), a new combination (Table 1). The present study reviews five species of Levinsenia reported from the Southern California Bight (SCB) in the Southern California Association of Marine Invertebrate Taxonomists (SCAMIT) Species List (Edition 11, 2016 https://scamit.org/publications/SCAMIT%20Ed%2011-2016.pdf): L. gracilis, L. sp. B SCAMIT 2007 §, L. multi- branchiata (Hartman, 1957), L. oculata (Hartman, 1957), and L. sp. SD1 Barwick 2000 § (https://www.scamit.org/ tools/#). A review of these species using scanning electron microscopy (SEM) revealed new characters, confirmed a broad geographic range for L. gracilis, reported a new geographic distribution for L. kirbyorum and contributed to the description of a new species, L. barwicki n. sp., with terminal sensory organ, 4-8 leaf-like branchiae, neuro- chaetae with recurved tip and distal hood. Specimens of Levinsenia gracilis collected from the Baltic Sea near the type locality were compared with specimens from Iceland, Puget Sound, and California, and are morphologically indistinguishable from one another. Levinsenia sp B SCAMIT 2007 § is confirmed to be L. kirbyorum Lovell, 2002, emended, reported previously from the Andaman Sea and now Southern California. Material and methods For examination using SEM, specimens were first dehydrated in an ethanol series. Ethanol was subsequently re- Accepted by P. Hutchings: 13 Feb. 2020; published: 17 Mar. 2020 257 Licensed under a Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/ moved through transfers to increasing concentrations of hexamethyldisilazane (HMDS). Specimens in HMDS were allowed to air dry, then mounted on aluminum stubs and coated with gold-palladium. Specimens were observed using a Hitachi S-3000N scanning electron microscope at the Natural History Museum of Los Angeles County (NHMLAC). The following institutional abbreviations are used: LACM-AHF, Allan Hancock Foundation Polychaete Collec- tion, Natural History Museum of Los Angeles County; USNM, National Museum of Natural History, Smithsonian Institution; ZMUC, Zoological Museum, University of Copenhagen, MBARI, Monterey Bay Aquarium Research Institute. Use of § following an undescribed taxon, e.g. Levinsenia sp B SCAMIT 2007 §, indicates an accepted provisional identification within the SCAMIT Edition 11 (https://scamit.org/publications/SCAMIT%20Ed%2011- 2016.pdf) species list, with accepted voucher sheet distinguishing characters documenting the taxon’s validity and standardizing identification in the Southern California Bight. TABLE 1. List of Levinsenia species in World Register of Marine Species (WoRMS; except L. barwicki n. sp.)*. L. acutibranchiata (Strelzov, 1973), L. antarctica (Strelzov, 1973) L. barwicki n. sp. (described herein) L. brevibranchiata (Strelzov, 1973) L. canariensis (Brito & Núñez, 2002) L. demiri Çinar, Dagli & Acik, 2011 L. duodecimbranchiata Cantone, 1995 L. flava (Strelzov, 1973) L. gracilis (Tauber, 1879) L. hawaiiensis Giere, Ebbe & Erséus, 2007 L. kantauriensis Aguirrezabalaga & Gil, 2008 L. kirbyorum Lovell, 2002 L. kosswigi Çinar, Dagli & Acik, 2011 L. marmarensis Çinar, Dagli & Acik, 2011 L. materi Çinar & Dagli, 2013 L. multibranchiata (Hartman, 1957) L. oculata (Hartman, 1957) L. oligobranchiata (Strelzov, 1973) L. reducta (Hartman, 1965) L. tribranchiata Çinar, Dagli & Acik, 2011 L. uncinata (Hartman, 1965) *Two additional species listed in Blake, (2016) not appearing in WoRMS are Levinsenia japonica Imajima, 1973) and L. pycnobranchiata (Fauchald, 1972). Results Systematics account Family PARAONIDAE Cerruti, 1909 Genus Levinsenia Mesnil, 1897 Tauberia Strelzov, 1973. Fide Melville (1979). Periquesta Brito & Núñez, 2002. Fide Giere et al. (2007). Type Species. Aonides gracilis Tauber, 1879, designated by ICZN (Melville 1979). Description. Body threadlike, 16–30 mm long, 0.15–0.35 mm wide, sometimes with spiral or corkscrew shape. 258 · Zootaxa 4751 (2) © 2020 Magnolia Press LOVELL & FITZHUGH Prostomium without median antenna; lateral, dorsal, and ventral ciliary patches present; terminal sensory organ or palpode present. Nuchal organs on peristomium. Four to seven prebranchial chaetigers, 4–22+ branchial pairs. Notopodial postchaetal lobes present; neuropodial postchaetal lobes absent. Capillary chaetae only in notopodia; neuropodia with capillary chaetae only in pre-branchial and branchial chaetigers, post-branchial chaetigers mixed, with capillary chaetae and apically curved acicular spines with fringe on convex side or with hooded apex. Py- gidium tapered, with two anal cirri. Levinsenia gracilis (Tauber, 1879) Figures 1A–D; 2A–D, 7A, B Aonides gracilis Tauber, 1879: 115. Levinsenia gracilis.–Mesnil & Caullery, 1898: 136–138, Pl. 6, Fig. 10.—Blake 1996: 33–44, Fig. 2.1. Paraonis (Paraonis) gracilis. Cerruti, 1909: 468, 498, 504.—Pettibone, 1963: 301–302, Fig. 79a–d. Paraonis gracilis.—Eliason, 1920: 55–56, Fig. 16a-e. Wesenberg-Lund, 1950: 32, Pl. 7, Fig. 34.—Uschakov, 1955: 286, Fig. 103a–b. Hartman, 1957: 330–331, Pl. 22, Figs 4–5 (synonymy); 1969: 75–76, Figs 1–3. Paraonis gracilis gracilis.—Day, 1967: 566, Fig. 24.4a–b. Paraonis gracilis minuta. Hartmann-Schröder, 1965: 197–198, Figs 181–182. Fide Strelzov, 1973. Paraonis (Paraonides) gracilis.—Monro, 1930: 150–152, Fig. 58. Paraonis filiformis—Hartman, 1953: 39–40, Fig. 12B–C. Fide Hartman, 1957. Paraonis (Paraonis) ivanovi.—Banse & Hobson, 1968: 23, Fig. 5f. Fide Strelzov, 1973. Tauberia gracilis.—Strelzov, 1973: 127–133, Figs 14, 54–57 (synonymy). Material examined. Denmark, Samsø, Kattegat, coll. Winther, syntype (NHMD 108749 (prev. ZMUC CRU- 966)), as Aonides gracilis Tauber; Kattegat, Frederikshavn, Hirsholmene, July 23, 1949, coll. P.L. Kramp, det. E. Wesenberg-Lund, 1 specimen (LACM-AHF 12549).—Sweden, Kattegat, Värö, Ringhals Sund, 19 m depth, Sta. L7, 57°16.1’N, 12° 4.8’E, 0.1 m² Smith-McIntyre grab, 11 March 1975, coll. KMS Kristineberg, sample 2, det. M.E. Petersen, 1 specimen on SEM stub (LACM-AHF 12548), 9 specimens in ethanol (NHMD 644302).—Iceland, Dan- ish Ingolf Expedition, Sta. 138, 63°26’N, 7°56’W, 887 m depth, 10 August 1896, det. E. Wesenberg-Lund, 2 speci- mens (1 in ethanol, 1 mounted on SEM stub) (LACM-AHF 12550); NE of Iceland, 65°45’N, 12°10’W, 107 m depth, 13 June 1925, coll. Fisheries Board of Scotland, det. E. Wesenberg-Lund, 1 specimen (NHMD 644303).—Green- land, SW Greenland, Bankeundersøgelserne, Sta. 37 B, April 1975, 1 specimen (NHMD 644314); SW Greenland, Bankeundersøgelserne, Sta. 31-B, April 1975, 1 specimen (NHMD 644315); SW Greenland, Bankeundersøgelserne, Sta. 3C, April 1975, 5 specimens (NHMD 644316); SW Greenland, Bankeundersøgelserne, Sta. 81A, April 1975, 1 specimen (NHMD 644318).—USA, California, Santa Barbara County, Santa Barbara Channel, 12.7 miles bear- ing 86.6° True from Pt. Conception Light, 34°27’25’’N, 120°12’55’’W, 17.4 m depth, Hayward orange peel grab, R/V Velero IV, Sta. 4938-57, coll. Allan Hancock Foundation, 09 April 1957, 25+ specimens (1 specimen on SEM stub, other specimens in ethanol (LACM-AHF 12551); Northern Channel Islands, north of Santa Cruz Island, Bight 2008, Sta. 7556, 92 m depth, 34.08°N, 119.71°W, 0.1 m² Van Veen, 1.0 mm sieve, 09 September 2008, 2 specimens (LACM-AHF 12560).—San Diego County, Carlsbad, Encina, National Pollution Discharge Elimination System (NPDES) 9232, Sta. G1, replicate 4, 45 m depth, 33°06.42’N, 117°20.75’W, 0.1 m² Van Veen grab, February 1992, 3 specimens (1 specimen on SEM stub, 2 in ethanol) (LACM-AHF 12552); San Onofre, San Onofre Nuclear Generating Station (SONGS) D6700-60, Sta. XXXI, replicate 1, 33.32°N, 117.51°W, 18.3 m deep, 0.008 m² diver core, 0.5 mm sieve, 16 September 1981, 1 specimen (LACM-AHF 12553)—Orange County, Huntington Beach, Orange County Sanitation District (OCSD) Survey 8501, Sta. 13, rep. 3, 33°35.31’N, 118°2.94’W, 60 m depth, 0.1 m² Van Veen grab, 18 August 1985, 1.0 mm sieve, 1 specimen (LACM-AHF 12554); Huntington Beach, OCSD Survey 8501, Sta. 30, rep. 1, 33°35.49’N, 118°2.89’W, 30 m depth, 0.1 m² Van Veen grab, 20 August 1985, 1.0 mm sieve, 1 specimen (LACM-AHF 12555); Huntington Beach, OCSD Survey 9276, Sta. Control, rep. 5, 33°36.04’N, 118°5.39’W, 60 m depth, 0.1 m² box core, 1 specimen (LACM-AHF 12556); Huntington Beach, OCSD Survey 9382, Sta. LA3, rep. 1, 33°31.72’N, 117°54.73’’W, 436 m depth, 0.3mm sieve, 25 January 1993, 0.1m² Van Veen grab, 4 specimens (LACM-AHF 12557); Dana Point, SCWD NPDES Sta. A, rep. 3, ~33.45°N, 117.68°W, 39.6 m depth, 0.1m² Van Veen grab, 1.0 mm sieve, 16 December 1981, 1 specimen (LACM-AHF12558).—Los Angeles County, Southern California Coastal Water Research Project (SCCWRP) Los Angeles County Stormwater, survey 1914, Sta. MBD25, rep. 1, Van Veen grab, 1 specimen (LACM-AHF 12559)—Monterey County, Monterey Can- yon, MBARI sample V3147–C17, 1004 m depth, 7 January 2008, 36.74°N, 122.28°W, ROV Ventana, 1 specimen AN SEM REVIEW OF LEVINSENIA SPECIES Zootaxa 4751 (2) © 2020 Magnolia Press · 259 (LACM-AHF 12561); MBARI sample V3124─C24, 1004 m depth, 7 January 2008, 36.74°N, 122.28°W, ROV Ventana, 1 specimen (LACM-AHF 12562); MBARI sample V3147─C27, 1004 m depth, 7 January 2008, 36.74°N, 122.28°W, ROV Ventana, 1 specimen (LACM-AHF 12563).—Washington, Puget Sound, Seattle Metro, Publi- cally Owned Treatment Works (POTW), West Point, METRO/TPPS Sta. XIII-100, 47.66°N, 122.46°W, 30.5 m depth, 28 September 1981, 0.1 m² Van Veen grab, 1.0 mm sieve, 7 specimens (LACM-AHF 12564). FIGURE 1. Levinsenia gracilis (Tauber, 1879), adult, California specimen: (A) prostomium with palpode, nuchal organs, dorsal view; (B) anterior body with branchiae, lateral view; (C) transverse ciliary bands between branchiae, dorsal view; (D) notopo- dial glandular pores, acicular neurochaetae with fibrils, lateral view. Abbreviations: ci, cilia; no, nuchal organ; pl, post-chaetal lobe; so, palpode sensory organ; sp, sensory pores. Scale bars: A, 50 μm; B, 300 μm; C, 100 μm; D, 15 μm. 260 · Zootaxa 4751 (2) © 2020 Magnolia Press LOVELL & FITZHUGH Description. Specimens up to 30 mm long, 0.2–0.3 mm wide. Body thin, dorsally flattened in prebranchial region, thereafter round in cross section, uniformly wide. Body tan, gut visible in posterior chaetigers. Prostomium triangular, slightly longer than wide; terminal sensory organ present; eyes absent; nuchal organs ciliated slits; me- dian antenna absent (Fig. 1A). Prebranchial region 5–7 segments, followed by 7–16 branchial pairs (size depen- dent) (Figs 1B, 2A); branchiae distally tapered, blunt tipped, ciliated laterally, with dorsal transverse ciliary bands between branchiae (Figs 1C, 2B). Notopodial post-chaetal lobes as low mounds in prebranchial chaetigers, digitate in branchial region, shorter in post-branchial region; neuropodial post-chaetal lobes absent. Notopodial sensory pores present along entire body (Figs 1D, 2C), may have projecting filament (mucous strand?). Notochaetae capil- lary throughout; neurochaetae capillary only for anterior segments, post-branchially an anterior capillary row and posterior row of slightly curved, tapering acicular chaetae with fringe of fibrils along distal convex side, usually 3–7 acicular chaetae per fascicle (Figs 1D, 2D). Pygidium with pair of anal cirri. Methyl green stain. Ventral banding in branchial region, no MG spots in post-branchial region (Fig. 7A–B). Specimens from Sweden and California with similar staining patterns. FIGURE 2. Levinsenia gracilis (Tauber, 1879), adult, Sweden specimen: (A) anterior body with branchiae, lateral view; (B) transverse ciliary bands between branchiae, dorsal view; (C) notopodial glandular pores, lateral view; (D) acicular neurochaetae with fibrils, lateral view. Abbreviations: ci, cilia; pl, post-chaetal lobe; sp, sensory pores. Scale bars: A, 500 μm; B, 100 μm; C, 10 μm; D, 10 μm. Remarks. Several species of Paraonidae are reported with broad geographic and depth ranges. SEM images of Levinsenia gracilis from near the type locality (Baltic Sea) and Southern California Bight were compared and found to be indistinguishable morphologically. Ciliary bands dorsally connecting the branchiae are newly described for the species and consistent in material from both locations. Methyl green staining has not been previously published AN SEM REVIEW OF LEVINSENIA SPECIES Zootaxa 4751 (2) © 2020 Magnolia Press · 261 with paraonid specimens, but the same pattern is present in all L. gracilis specimens stained. For information on diagnostic character differences, see the dichotomous key below and table of character distributions (Table 2). Levinsenia gracilis has a reported cosmopolitan distribution with a broad bathymetric range (Strelzov 1973, Blake 1996). Material examined from Denmark, Sweden, Iceland, Greenland, Washington, USA, and California, USA, were all collected within the reported (very wide) depth range, are morphologically similar, and represent occur- rences indicating a broad geographic distribution. The specimen from the Zoological Museum, Natural History Museum of Denmark, is noted as the only surviving syntype and is in four pieces, but the characters match the published description of L. gracilis. It cannot be assumed that all literature reports of Levinsenia gracilis from other locations are correctly identi- fied. Nine species of Levinsenia (Table 1) have been described since Strelzov (1973) reviewed the family. Several of these new species were originally identified as L. gracilis, but later re-examined and determined to be new (see WoRMS). Type locality. Denmark. Distribution. Cosmopolitan, subtidal to 3000+ m. Levinsenia kirbyorum Lovell, 2002, emended Figures 3A–D, 7C, H Levinsenia kirbyae Lovell, 2002: 49–51, Fig. 9A–D. Levinsenia sp B SCAMIT 2007 §: SCAMIT 2007, Vol 25, No. 5, 1-12. Material examined. Indian Ocean, Andaman Sea, Sta. G-2/OS, 23 April 1996, 63 m depth, paratype (LACM- AHF 2091).—USA. California. Orange County, Huntington Beach, OCSD Survey 97130, 1997, Sta. 37, rep. 4, 56 m depth, 0.1 m² Van Veen grab, 07 January 1997, 1.0 mm sieve, 1 specimen, SEM stub (LACM-AHF 12565); OCSD Survey 9276, Sta. Control, replicate 5, 60 m depth, 0.1 m² Van Veen grab, 23 July 1992, 1.0 mm sieve, 1 specimen, SEM stub (LACM-AHF 12566).—San Diego County, Carlsbad, Encina Treatment Plant, NPDES 9126, Sta. R2, rep. 4, 33°07.566’N, 117°20.694’W, 45 m depth, 0.1 m² Van Veen grab, 1991, 1.0 mm sieve, 1 specimen, SEM stub (LACM-AHF 12567); Southern California Bight Project (SCBP), Bight 2003, Sta. A2, 29 m deep, 6 Aug 2003, North San Diego Shelf, 33.165°N 117.391°W, 0.1 m² Van Veen grab, 1.0 mm sieve, coll. Weston Solutions 1 specimen, SEM stub (LACM-AHF 12568); SCCWRP, Southern California Bight Project (SCBP), Bight 2008, Sta. 7556, 92 m deep, 09 September 2008, Channel Islands, 34.0790°N 119.7008°W, 0.1 m² Van Veen grab, 1.0 mm sieve, 3 specimens (LACM-AHF 12569); Carlsbad, Encina Treatment Plant NPDES 9232, Sta. G1, replicate 3, 33°06.42’N 117°20.74’W, 45 m depth, 0.1 m² Van Veen grab, 1992, 1.0 mm sieve, 1 specimen (LACM-AHF 12570); NPDES 9344, Sta. G2, rep. 3, 33°06.73’N, 117°20.85’W, 45 m depth, Van Veen grab, 1993, 1.0 mm sieve, 1 specimen (LACM-AHF 12571); NPDES 9232, Sta. R2, rep. 1, 33°07.566’N, 117°20.694’W, 45 m depth, 0.1 m² Van Veen grab, 1992, 1.0 m sieve, 1 specimen (LACM-AHF 12572); Cardiff by the Sea, San Elijo Treatment Plant NPDES, sta. A-2-5, replicate 2, ~33.07°N, 117.25°W, 45(?) m depth, 9 March 2004, 0.1 m² Van Veen grab, 1.0 mm sieve, 1 specimen (LACM-AHF 12573); San Onofre, SONGS D400-175 XXII, rep. 2, ~33.36°N, 117.57°W, 53.34 m depth, 6 April 1980, 0.1 m² Van Veen grab, 1.0 mm sieve, 1 specimen (USNM 1604269); Carlsbad, Encina Treatment Plant NPDES: 9344, Sta. R2, rep. 3, 33°07.566′N, 117°20.694′W, 46 m depth, 0.1 m² Van Veen grab, 1993, 1.0 mm sieve, 1 specimen (USNM 1604270).—Orange County, Huntington Beach, OCSD NPDES Survey 97139, Sta. ZB, rep. 3, 33°34.54’N, 118°0.00’W, 56 m depth, 0.1 m² Van Veen grab, 22 October 1997, 1.0 mm sieve, 1 specimen (LACM-AHF 12574); OCSD NPDES Survey 9276, Sta. 37, rep. 2, 33°34.83’N, 117°57.37’W, 56 m depth, 0.1 m² box core, 24 July 1992, 1.0 mm sieve, 1 specimen (LACM-AHF 12575) ; OCSD NPDES Survey 9276, Sta. Control, replicate 4, 33°36.04’N, 118°5.39’W, 60 m depth, 0.1 m² box core, 23 July 1992, 1.0 mm sieve, 2 specimens (LACM-AHF 12576); OCSD NPDES Survey 98151, Sta. 5, rep. 1, 33°34.74’N, 118°01.61’W, 59 m depth, 0.1 m² Van Veen, 21 October 1998, 1.0 mm sieve, 1 specimen (LACM-AHF 12577) Description. Specimens up to 39 mm long, 0.15–0.35 mm wide. Body inflated, dorsally flattened in prebran- chial region, thereafter round in cross section. Tan color. Prostomium triangular, longer than wide; terminal sensory organ present; median antenna absent; ciliated peristomial nuchal slits. Prebranchial segments slightly inflated (Fig. 3A), with two longitudinal dorsal grooves. Branchiae begin on chaetigers 7–8, 13–20 pairs, conical; cilia present on lateral branchiae margins, continue as transverse bands across dorsum (Fig. 3B). Notopodial post-chaetal lobes 262 · Zootaxa 4751 (2) © 2020 Magnolia Press LOVELL & FITZHUGH short, conical in pre-branchial chaetigers, digitate in branchial region, shorter post-branchial. Notopodial sensory pores present along entire body (Fig. 3C), immediately below notochaetae, may have projecting filament. Neuro- podial post-chaetal lobes absent. Notopodia with capillary chaetae only. Neuropodia with capillary chaetae and up to 13 concave, fringed acicular spines in post-branchial segments. Neuropodial spines thinner, straighter (superior) and thicker, more recurved (inferior), double rows in far posterior chaetigers (Figs 3E, 7H). Abdominal segments with deep, transverse dorsal intersegmental furrows. Pygidium unknown. Methyl green stain. Branchial region with ventral bands, and distinct notopodial post-branchial spots (Fig. 7C). FIGURE 3. Levinsenia kirbyorum Lovell, 2002, adult: (A) prostomium with palpode, nuchal organs, dorsal view; (B) trans- verse ciliary bands between branchiae, dorsal view; (C) notopodial glandular pores, lateral view; (D) posterior chaetal fascicle showing multiple rows of acicular spines, lateral view. Abbreviations: ci, cilia; no, nuchal organ; pl, post-chaetal lobe; so, pal- pode sensory organ; sp, sensory pores. Scale bars: A, 200 μm; B, 200 μm; C, 20 μm; D, 50 μm. Remarks. SEM images of Levinsenia sp B SCAMIT 2007 § confirmed that it is the same as L. kirbyorum, described from the Andaman Sea, as noted in the voucher sheet. The unusual dorsal longitudinal furrows on the California material, which are very clearly visible with SEM (Fig. 3A), were not described for L. kirbyorum are confirmed The paratype of L. kirbyorum (LACM-AHF 2091) was reviewed and dorsal furrows were confirmed. The original description of L. kirbyorum Lovell 2002 is emended to include these furrows. The California material AN SEM REVIEW OF LEVINSENIA SPECIES Zootaxa 4751 (2) © 2020 Magnolia Press · 263 examined also has the unique double-rowed neurochaetal fascicle arrangement described for L. kirbyorum. Identi- cal methyl green staining spots are present in post-branchial notopodial areas in both Andaman Sea and California specimens. This is a range extension from the Andaman Sea into Southern California. For information on diagnostic character differences, see the dichotomous key below and table of character distributions (Table 2). The specific epithet is emended to acknowledge that the species was named in honor of three persons; Jacqueline Kirby Lovell, Andrew Kirby Lovell, and Robin Kirby Lovell. The name L. kirbyae is emended to Levinsenia kirbyorum. Type locality. Andaman Sea. Distribution. Andaman Sea, Indian Ocean; Southern California, 42–60 m depth. Levinsenia multibranchiata (Hartman, 1957) Figures 4A–D, 7D Paraonis multibranchiata Hartman, 1957: 332–333; 1969: 79–80, Fig. 1. Tauberia multibranchiata.—Strelzov, 1973: 135–136, Figs 11(1), 59. Levinsenia multibranchiata.—Blake, 1996: 36, Fig. 2.3. FIGURE 4. Levinsenia multibranchiata (Hartman, 1957), paratype AHF-LACM POLY 648, adult: (A) prostomium with pal- pode, nuchal organs, dorsal view; (B) branchial region, dorsal view; (C) notopodial glandular pores, lateral view; (D) acicular neurochaetae with fibrils, lateral view. Abbreviations: no, nuchal organ; pa, palpode; pl, post-chaetal lobe; sp, sensory pores. Scale bars: A, 100 μm; B, 300 μm; C, 20 μm; D, 30 μm. 264 · Zootaxa 4751 (2) © 2020 Magnolia Press LOVELL & FITZHUGH Material examined. USA, California, Santa Barbara County, Santa Barbara Channel Basin, 18.0 miles bearing 135° True from Point Conception Light, 34°14’10’’N, 120°12’45’’W, 502.9 m depth, green mud, Hayward orange peel grab, R/V Velero IV, Sta. 3731-55, coll. Allan Hancock Foundation, 12 December 1955, 14 paratypes (one specimen mounted on SEM stub) (LACM-AHF POLY 648).—Orange County, Huntington Beach, OCSD NPDES Survey 9270, Sta. C2, rep. 5, 33°36.12’N, 117°56.02’W, 56 m depth, 0.1 m² Van Veen grab, 1.0 mm sieve, 1 speci- men (LACM-AHF 12578); survey 9382, Sta. C2, rep. 1, 33°36.12’N, 117°56.02’W, 56 m depth, 0.1 m² Van Veen grab, 1.0 mm sieve, 12 specimens (LACM-AHF 12579); survey 9279, Sta. C2, rep. 3, 33°36.12’N, 117°56.02’W, 56 m depth, 0.1 m² Van Veen grab, 1.0 mm sieve, 20 specimens (LACM-AHF 12580); survey 9279, Sta. C2, rep. 5, 33°36.12’N, 117°56.02’W, 56 m depth, 0.1 m² Van Veen grab, 1.0 mm sieve, 2 specimens (LACM-AHF 12581); survey 95109, Sta. C2, rep. 1, 33°36.12’N, 117°56.02’W, 56 m depth, 0.1 m² Van Veen grab, 1.0 mm sieve, 1 speci- men (LACM-AHF 12582).—San Diego County, Carlsbad, Encina Treatment Plant NPDES Survey 9344, Sta. R2, rep. 1, ~33°07.57’N, 117°20.69’W, 46 m depth, 0.1 m² Van Veen grab, 1.0 mm sieve, 1 specimen (LACM-AHF 12583); survey 9344, Sta. R2, rep. 3, ~33°07.57’N, 117°20.69’W, 46 m depth, 0.1 m² Van Veen grab, 1.0 mm sieve, 1 specimen (LACM-AHF 12584). Description. Specimens up to 30 mm long, 0.15–0.25 mm wide. Thorax slightly inflated in prebranchial chae- tigers, rounded in cross section thereafter. Body tan. Prostomium conical, wider than long; poorly-developed termi- nal sensory organ; pair of ciliated peristomial nuchal organs; median antenna absent (Fig. 4A). Branchiae begin on chaetigers 7–8, 20–36 pairs; thin, tapering, five times longer than wide (Fig. 4B); cilia present on lateral edges, with connecting transverse dorsal bands of short cilia. Notopodial post-chaetal lobes papilla-like on chaetiger 1, digitate in branchiate region, shorter post-branchial. Notopodial sensory pores (Fig. 4C) present on all segments. Neuro- podial post-chaetal lobes absent. Noto- and neuropodial capillary chaetae from chaetiger 1. Acicular neurochaetae, 5–7 per fascicle, begin post-branchial; each spine slightly curved, tapering and thinner distally, with fringe of fibrils on convex margin; spines alternating with capillary chaetae (Fig. 4D). Pygidium with dorsal anal pore, mid-ventral lobe, two short anal cirri. Methyl green stain. None present (Fig. 7D). Type locality. Southern California, Santa Barbara Basin. Distribution. Southern and Central California, 45–540 m deep. Remarks. Levinsenia multibranchiata is readily distinguished from other SCB species by the more numerous and elongate branchiae. For information on diagnostic character differences, see the dichotomous key and Table 2. Levinsenia oculata (Hartman, 1957) Figures 5A–E, 7E, F Paraonis gracilis oculata Hartman, 1957: 331–332, Pl. 44, Figs 1–3; 1963: 77–78, 3 Figs 1-3. Tauberia oculata.—Strelzov, 1973: 133–135, Figs 16(10), 58 (Synonymy).—Smith, 1985: 186. Levinsenia oculata.—Blake, 1996: 34–36, Fig. 2.2. Levinsenia kirbyorum.—of authors SCB not Lovell 2002. Material examined. USA, California, Southern California Bight, Bight 2008, Sta. 7168, 822 m depth, 33.2748°N, 118.0861°W, 18 September 2008, 0.1 m² Van Veen, 1.0 mm sieve, 1 specimen (LACM-AHF 12585); station 7251, 696 m depth, 33.5793°N, 118.3287°W, 16 July 2008, 0.1 m² Van Veen grab, 1.0 mm sieve, 1 specimen (LACM- AHF 12586); Sta. 5925, 1 specimen, SEM stub (LACM-AHF 12587). OCSD 97130, Sta. 37, rep. 4, 56 m, 0.1 m² Van Veen grab, 1.0 mm sieve, 1 specimen, SEM stub (LACM-AHF 12588). Bight 2013, Sta. 9132, 82.6 m, 9 Sep- tember 2013 (OCSD voucher 2436), 1 specimen, SEM stub (LACM-AHF 12589). Description. Specimens up to 20 mm long, 0.25 mm wide. Body slightly inflated in prebranchial region, there- after cylindrical in cross section. Body cream colored, brownish ‘ocular’ pigment on lateral margins of prostomium. Prostomium triangular, as long as wide, with terminal sensory organ, nuchal organs and lateral ciliary patches; pigmented ‘eyespots’ (Fig. 7E, F); median antenna absent; peristomium with ciliated nuchal organs. Five to eight prebranchial segments followed by 8–11 pairs of tapering branchiae, 6–7 times longer than wide, distally blunt, sparsely ciliated, connected dorsally by bands of cilia (Fig. 5B, C). Prebranchial notopodial post-chaetal lobes as low mounds, cirriform in branchial region, shorter post-branchial. Neuropodial post-chaetal lobes absent. Noto- podial sensory pores present on all segments (Fig. 5D). Notochaetae capillary throughout. Neuropodial capillary AN SEM REVIEW OF LEVINSENIA SPECIES Zootaxa 4751 (2) © 2020 Magnolia Press · 265 chaetae throughout; post-branchial chaetigers include distally curved acicular spines with convex fringe of fibrils, up to seven per fascicle, alternating with long capillaries (Fig. 5E). Pygidium narrow, two anal cirri. Methyl green stain. Thorax staining in pre- and post-chaetal areas, speckled in pre-branchial chaetigers, a solid band in branchial and 2–3 post-branchial chaetigers, with similar lighter staining in abdominal chaetigers (Fig. 7E). Type locality. USA, Southern California, outer Los Angeles Harbor. Distribution. Central California to Gulf of California, shallow subtidal to 1272 m. Remarks. This species is rarely encountered on the Southern California Bight shelf and more typically col- lected in slope and basin depths. Reports of shallow subtidal collections need to be verified. For information on diagnostic species differences see the dichotomous key below and table of character distributions (Table 2). The presence of ‘ocular’ pigment separates L. oculata from L. gracilis, but can fade over time in preserved specimens. The first author has seen freshly collected specimens from off Angola West Africa with ‘ocular’ pigment similar to L. oculata, but differs in having shorter, curved neurochaetal spines. FIGURE 5. Levinsenia oculata (Hartman, 1957), adult: (A) prostomium with palpode, nuchal organs, dorsal view; B) anterior body with branchiae, dorso-lateral view; (C) low transverse ciliary bands between branchiae, dorso-lateral view; (D) notopodial glandular pores, lateral view; (E) posterior chaetal fascicle showing capillary and acicular spines, lateral view. Abbreviations: no, nuchal organ; sp, sensory pores. Scale bars: A, 200 μm; B, 300 μm; C, 50 μm; D, 10 μm; E, 20 μm. 266 · Zootaxa 4751 (2) © 2020 Magnolia Press LOVELL & FITZHUGH