Rev. Mus. Argentino Cienc. Nat., n.s. 18(2): 237-241, 2016 ISSN 1514-5158 (impresa) ISSN 1853-0400 (en línea) The sea cucumber Psolus patagonicus (Echinodermata: Holothuroidea) from the southwestern Atlantic: Redescription of the holotype and a new synonym Mariano I. MARTÍNEZ Laboratorio de Ecosistemas Costeros, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” (CONICET), Av. Ángel Gallardo 470, C1405DJR Buenos Aires, Argentina. E-mail: [email protected] Abstract: Psolus patagonicus Ekman, 1925 is redescribed from material including the holotype, deposited in the Zoologisches Museum Hamburg (ZMH), and specimens of the Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” (MACN-In). Psolus marcusi Tommasi, 1971 is stated as a junior synonym. Since also the specimens used by Ludwig in 1897 to report the brooding behavior of Psolus antarcticus (ZMH: E4168) are identifiable as P. patagonicus, the latter is the only South American psolid holothuroid known to be a brooder. Key words: Dendrochirotida; Psolidae; type material; reproductive behavior Resumen: Se redescribe Psolus patagonicus Ekman, 1925 a partir de material del Zoologisches Museum Hamburg (ZMH), que incluye al holotipo, y especímenes del Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” (MACN-In). Psolus marcusi Tommasi, 1971 se propone como un sinónimo más reciente. Puesto que los ejemplares usados por Ludwig en 1897 para informar sobre el comportamiento de incubación de Psolus an- tarcticus (ZMH E4168) son identificables como P. patagonicus, este es el único psólido sudamericano del que se sabe que es incubador. Palabras clave: Dendrochirotida; Psolidae; material tipo; comportamiento reproductivo _____________ INTRODUCTION Psolus patagonicus, analyzing the holotype from the Zoologisches Museum Hamburg (ZMH) and Six species of the family Psolidae Burmeister, specimens from the Collection of Invertebrates 1837 live in the Argentine coast: Psolus patago- at the Museo Argentino de Ciencias Naturales nicus Ekman, 1925, Psolus segregatus Perrier, “Bernardino Rivadavia” (MACN-In), as a con- 1905, Psolus antarcticus (Philippi, 1857), Psolus sequence of which P. marcusi is recognized as a marcusi Tommasi, 1971, Psolidium dorsipes junior synonym, and the identity of the mate- Ludwig, 1887, and Psolidium disciformis (Théel, rial labeled as P. antarcticus by Ludwig (1897) is clarified. 1886) (Deichmann, 1947; Pawson, 1969a, 1969b; Hernández, 1981). Originally described from the RESULTS “Patagoniske Bank” (46° S), Psolus patagonicus is the commonest one. While Deichmann (1947) Psolus patagonicus Ekman, 1925 and Pawson (1969a, 1969b) studied this species from Tierra del Fuego, Bernasconi (1941) and Psolus patagonicus Ekman, 1925: 140; Bernasconi, Hernández (1981) focused the study to northern 1941: 48, fig. VI; Deichmann, 1941: 145; waters (up to 38° S), extending the known distri- Deichmann, 1947: 339; Pawson, 1964: 463; Pawson, bution of this species to almost all the Argentine 1969a: 129; Pawson, 1969b, Map 5; Hernández, shelf. Tommasi (1971) described a new species, P. 1981: 155; Tommasi et al., 1988: 2; Larrain, 1995: 89; Lancellotti & Vasquez, 1999 (anexo), 2000; Ríos marcusi, from off Mar del Plata, Argentina (38° et al., 2003, 2005: 231; Mutschke & Ríos 2006; S). Although the description was adequate, no in- Giménez & Penchaszadeh, 2010: 1; Martínez et al., formation about a holotype or type specimens was 2011: 1; Brogger et al., 2013: 380; Solís-Marín et stated. The purpose of this work is to redescribe al., 2013: 590. 238 Revista del Museo Argentino de Ciencias Naturales, n. s. 18(2), 2016 Fig. 1. Psolus patagonicus Ekman, 1925. Holotype: ZMH E4173, dorsal view. Scale bar: 1 cm. Psolus marcusi Tommasi, 1971: 4. with four holes (70–170 μm), slightly curved and Psolus antarcticus: Ludwig, 1897 (non Philippi, 1857). plates with multiple perforations with lobed ends (Fig. 2a, 3a). Tentacles and podia with curved Description: Psolid shape, up to 23.26 mm bars (70–200 μm), end plate up to 400 μm (Fig. long, color in life light orange to white; in alco- 2b, 3b, 3c). hol, white. Mouth and anus dorsal, covered by Distribution: Southwest Atlantic Ocean, from five valves and five interradial teeth between Mar del Plata (38° S) to Tierra del Fuego (54° the valves. Valves and interradial teeth in anus S) and Cape Horn. In the Pacific Ocean, known about half size of mouth pieces (Fig. 1). Tentacles from the vicinity of Magellan Strait (48° S) 10, white with brown dots, eight dendritic and (Hernández, 1981). the last two (most ventral) reduced, bifid-ended (ratio 1:3). Tube feet up to 0.35 mm in diameter, Examined material: Holotype “Patagonische only on ventral side; trivium with central ambu- Bank 46° S. B. 60 fad. Kpt. H. Nissen 15.VI.1906” lacra naked, and both lateral ambulacra with one (ZMH E4173); ZMH: E4172, E4171, E4168, zig-zag and two rows of podia. Calcareous ring E4167; MACN-In: 12661, 16264, 23362, 25125, simple, with five radial and five interradial pieces 34776, 34777, 37574. fused at the base. Radial piece with an anterior notch and anteriorly wider than the interradial Habitat: Rocks, shells, Macrocystis fronds and holdfast (Pawson, 1969a; Giménez & piece, which has not notch. One Polian vesicle in Penchaszadeh 2010, and this paper). the left ventral side, one stone canal and a two- kidney shaped madreporite, attached to the base Depth: Intertidal to about 308 m (Hernández, of the middorsal interradial piece. Gonad on the 1981, and this paper). dorsal side, below the calcareous ring, composed by multiple tubes, well developed during repro- Remarks: In some specimens with retracted ductive season. Respiratory trees well extended tentacles, the oral and anal valves may cover the up to the anterior part of the body, right trunk oral and anal interradial teeths, which could not longer than the left one. be seen. According to Pawson (1964) teeths could Ossicles from the ventral wall are plates be absent in small specimens. Martínez: Psolus patagonicus, redescription and new synonym 239 Fig. 2. Psolus patagonicus Ekman, 1925. Ossicles: A. plates from the sole, B. end plate. Scale bar: 50 μm. DISCUSSION only difference to P. patagonicus (Fig. 1, 4) with no comparison to the sympatric psolid, Psolus pa- The original description of Psolus marcusi tagonicus. The specimen described by Tommasi Tommasi, 1971, based on a single specimen 11 was deposited at the Museu de Zoologia da mm long, noted the absence of oral teeth as the Universidade de São Paulo (Tommasi, personal 240 Revista del Museo Argentino de Ciencias Naturales, n. s. 18(2), 2016 Fig. 3. Psolus patagonicus Ekman, 1925. Ossicles: A. Plates from the ventral side, B. Curved plates from po- dia, C. Curved plates from tentacles. Scale bar: 100 μm. Fig. 4. Psolus marcusi Tommasi, 1971. Drawings from Fig. 9 and 10 of Tommasi (1971). A. lateral, B. dorsal, C. ventral view, D-E. plates, F-G. curved plates with multiple perforations. Martínez: Psolus patagonicus, redescription and new synonym 241 communication), but no such material could be BIBLIOGRAPHY traced in that collection, so I conclude that the holotype of Psolus marcusi is lost. Bernasconi, I. 1941. Los equinodermos de la expedición Since the oral and anal teeth of Psolus patag- del Buque Oceanográfico “Comodoro Rivadavia” A.R.A. Physis 19: 37-49. onicus may be easily overlooked when they are Brogger, M.I., D. Gil, T. Rubilar, M. Martínez, E. Díaz covered by the oral and anal valves, and Pawson de Vivar, M. Escolar, L. Epherra, A. Pérez & A. (1964) pointed out that oral teeth could be ab- Tablado. 2013. Echinoderms from Argentina: sent in small specimens (up to 11 mm, i.e. the Biodiversity, distribution and current state of size of the holotype of P. marcusi), there is no knowledge. Pp. 359-402 in: Alvarado, J.J. & F.A. evidence of any meaningful difference between Solís-Marín (eds.) Echinoderm Research and these two sympatric taxa. So I conclude that P. Diversity in Latin America. Berlin: Springer. 658 marcusi Tommasi, 1971 is a junior synonym of P. pp. Burmeister, H. 1837. Handbuch der Naturgeschichte. patagonicus Ekman, 1925. Zum Gebrauch bei Vorlesungen. Zweite Abtheilung. Psolus patagonicus was reported as a brooder Zoologie, p. 471. Berlin: Enslin. xii + pp. 369–858. by Bernasconi (1941), Hernández (1981) and Deichmann, E. 1941. The Holothuroidea collected by Giménez & Penchaszadeh (2010). Martínez et al. the Velero III during the years 1932 to 1948. Part I, (2011) studied the reproductive cycle and found Dendrochirota. Allan Hancock Pacific Expeditions a spawning event during February, which is fol- 8: 61-196. Los Angeles: The University of Southern lowed by a brooding period from February to California Press. September (Giménez & Penchaszadeh 2010). Deichmann, E. 1947. Shallow water holothurians from Cabo de Hornos and adjacent waters. Anales del Ludwig (1897) reported a brooding behav- Museo Argentino de Ciencias Naturales 8: 325- ior for Psolus antarcticus (Philippi, 1857). This 351. report did not include any collection number. Ekman, S. 1925. Holothurien. Further Zoological However, the specimens E4168 from the ZMH Results of the Sweden Antarctic Expedition 1: collection, which are coincident in locality, col- 1-194. Stockholm: Norstedt. lector and date with the material mentioned by Giménez, J. & P.E. Penchaszadeh. 2010. Brooding Ludwig as P. antarcticus, were labeled as P. pa- in Psolus patagonicus (Echinodermata: Holothuroidea) from Argentina, SW Atlantic tagonicus by Power in 1965, and this identifica- Ocean. Helgoland Marine Research 64(1): 21-26. tion is confirmed herein. Therefore, Ludwig’s Hernández, D.A. 1981. Holothuroidea de Puerto (1897) report on brooding actually referred to P. Deseado (Santa Cruz, Argentina). Revista del Museo patagonicus before its original recognition as a Argentino de Ciencias Naturales “Bernardino different species by Ekman (1925). Since there Rivadavia” 4: 151-168. are no other reports on P. antarcticus brooding Larrain, A.P. 1995. Biodiversidad de equinodermos chi- behavior after Ludwig’s observations, and the lenos: Estado actual del conocimiento y sinopsis identification of his specimens was rectified, the biosistemática. Gayana, Zoología 59: 73-96. Lancellotti, D.A. & J.A. Vásquez. 1999. Biogeographical only brooder psolid up to now properly described patterns of benthic macroinvertebrates in for South America is P. patagonicus. the Southeastern Pacific littoral. Journal of Biogeography 26(5): 1001-1006. ACKNOWLEDGMENTS Lancellotti, D.A. & J.A. Vásquez. 2000. Zoogeografía de macroinvertebrados bentónicos de la costa de I would like to thanks Daniel M. Lauretta, Chile: contribución para la conservación marina. Julio Arriaga-Ochoa, two anonymous reviewers Revista Chilena de Historia Natural 73(1): 99-129. Ludwig, H. 1887. Die von G. Chierchia auf der Fahrt and the editor, Néstor Cazzaniga, for valuable der Kgl. Ital. Corvette Vittor Pisani gesammelten suggestions and commentaries that improved Holothurien. Zoologische Jahrbücher 2: 1-36. this manuscript. Also to Alejandro Tablado Ludwig, H. 1897. Brutpflege bei Psolus antarcticus. (MACN), Andreas Smith-Rhaesa (ZMH), Helma Zoologischer Anzeiger 20: 237–239. Roggenbuck (ZMH) and Aline Staskowian Martínez, M.I., J. Giménez & P.E. Penchaszadeh. 2011. Benetti (MZUSP) for facilitating the search Reproductive cycle of the sea cucumber Psolus pa- of specimens in each collection. This work was tagonicus Ekman 1925, off Mar del Plata, Buenos partially founded by PICT 2015-0428, PICT Aires, Argentina. Invertebrate Reproduction & Development 55(2): 124-130. 2012-0561, PICT 2013-2504 from the Agencia McEuen, F.S. & F.S. Chia. 1991 Development and meta- Nacional de Promoción Científica y Tecnológica morphosis of two psolid sea cucumbers, Psolus chi- (Argentina), PIP 0253 from Consejo Nacional de tonoides and Psolidium bullatum, with a review Investigaciones Científicas y Técnicas (Argentina), of reproductive patterns in the family Psolidae PADI Foundation (USA), and DAAD (Germany). (Holothuroidea: Echinodermata). Marine Biology 242 Revista del Museo Argentino de Ciencias Naturales, n. s. 18(2), 2016 109(2): 267-279. Ríos C., E. Mutschke & E. Morrison. 2003. Biodiversidad Mutschke, E. & C. Ríos. 2006. Distribución espacial y bentónica sublitoral en el estrecho de Magallanes, abundancia relativa de equinodermos en el Estrecho Chile. Revista de Biología Marina y Oceanografía de Magallanes, Chile. Ciencia y Tecnología del Mar 38(1): 1-12. 29(1): 91-102. Solís-Marín, F.A. et al. (69 authors). 2013. Appendix. Pawson, D.L. 1964. The Holothuroidea collected by the Pp. 543-654 in: Alvarado, J.J. & F.A. Solís-Marín Royal Society Expedition to Southern Chile, 1958- (eds.) Echinoderm Research and Diversity in Latin 1959. Pacific Science 18: 453-470. America. Berlin: Springer. 658 pp. Pawson, D.L. 1969a. Holothuroidea from Chile report Théel, H. 1886. Report on the Holothurioidea dredged no. 46 of the Lund University Chile expedition by H.M.S. Challenger during the years 1873-76. 1948-1949. Sarsia 38(1): 121-146. Part II. In: Thompson, C. W. & J. Murray (dirs.) Pawson, D.L. 1969b. Holothuroidea. In: Bushnell, V.C. Report of the Scientific Results of the Voyage of & J.W. Hedgpeth (eds.). Antarctic Map Folio Series, H.M.S. Challenger during the years 1873-76 un- 11: 38-41. New York: American Geographical der the command of Captain George S. Nares, R.N. Society. F.R.S. and the late Captain Frank Tourle Thomson, Perrier, R. 1905. Holothuries antarctiques du Muséum R.N. 14, Zoology 39, 290 pp. d’Histoire naturelle de Paris. Annales de Sciences Tommasi, L.R. 1971. Equinodermes do Brasil I. Sôbre Naturelles, Zoologie 9(1): 104-146. algumas espécies novas e outras pouco conhecidas, Philippi, R.A. 1857. Vier neue Echinodermen des para o Brasil. Boletim do Instituto Oceanográfico Chilensischen Meeres. Archiv für Naturgeschichte 20(1): 1-22. 23: 130-134. Tommasi, L.R., M.C.W. Cernea & M.C.G. Condeixa. Rios, C., E. Mutschke, A. Montiel, D. Gerdes & W.E. 1988. Equinodermes coletados pelo N/Oc. Arntz. 22000055.. SSoofftt--bboottttoomm mmaaccrroobbeenntthhiicc ffaauunnaall aass-- “Almirante Saldanha”, entre 26°59´S e 38°39´S. sociations in the southern Chilean glacial fjord Relatório Interno do Instituto Oceanográfico, complex. Scientia Marina 69(Suppl. 2): 225-236. Universidade de São Paulo 22: 1-11. Doi: 10.22179/REVMACN.18.474 Recibido: 17-XI-2016 Aceptado: 27-XII-2016