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ZM 75 409-446 | 24 (galil) 12-01-2007 08:07 Page 409 A revision of Myra Leach, 1817 (Crustacea: Decapoda: Leucosioidea) B.S. Galil Galil, B.S. A revision of MyraLeach, 1817 (Crustacea: Decapoda: Leucosioidea). Zool. Med. Leiden 75 (24), 24.xii.2001: 409-446, figs 1-19.— ISSN 0024-0672. Bella S. Galil, National Institute of Oceanography, Israel Oceanographic & Limnological Research, P.O.B. 8030, Haifa 31080, Israel (e-mail: [email protected]). Key words: Decapoda; Leucosioidea; Myra; Myrodes;Myrine; new genus; new species; Indo-Pacific. A study of major collections led to a revision of the Indo-Pacific leucosioid genusMyraLeach, 1817. The systematic status and nomenclatural disposition of each species was assessed, and many were diagnosed based on examination of the type material. A new genus, Myrine,is established for M. acutidens (Ihle, 1918) and M. kesslerii (Paulson, 1875).The genus Myrodes Bell, 1855, is synonymized with Myra. Nine species are retained as valid: M. affinis Bell, 1855, M. australisHaswell, 1880, M. brevimana Alcock, 1896, M. elegans Bell, 1855, M. eudactyla (Bell, 1855), M. fugax (Fabricius, 1798), M. grandis Zarenkov, 1990, M. mammillarisBell, 1855, and M. subgranulata Kossmann, 1877. Five new species are established: M. celeris, M. currax, M. curtimana, M. pernixand M. tumidospina. All species are described and illustrated, extended synonymies are given, and a key for their identification is provided. Introduction Leach (1817) established Myra for Leucosia fugax Fabricius, 1798. Myra has since been a source of systematic and nomenclatural confusion because the subtle variants on its deceptively uniform morphology may be specific characters, or sex and age- dependent. Miers (1879: 42) noted “The species of this genus [Myra] …..bear a very close resemblance to one another” and advised (1884: 250) “large series are needed to determine with certainty the distinctions between the very variable species of this genus”, and Alcock (1896: 201) cautioned “The species of this genus [Myra] are often difficult to discriminate owing to the changes that they undergo in growth”. Yet, each author described new species based on inadequate or inappropriate material (e.g., juveniles, immature females). In fact, of the eight species that were described from juveniles - M.biconica Ihle, 1918; M. carinataBell, 1855;M. coalitaHilgendorf, 1878; M. cyrenae Ward, 1942; M. dubia Miers, 1879; M. intermedia Borradaile, 1903; M. pentacan- tha Alcock, 1896; M. subgranulata Kossmann, 1877 - five were described from single specimens. A study of the collections of the Nationaal Natuurhistorisch Museum, Leiden (for- merly Rijksmuseum van Natuurlijke Historie) (RMNH), Museum National d’Histoire naturelle, Paris (MNHN), National Museum of Natural History, Smithsonian Institu- tion, Washington (USNM), Natural History Museum, London (NHM), together with material made available by the Australian Museum, Sydney (AMS), Koninklijk Bel- gisch Instituut voor Natuurwetenschappen, Brussels (KBIN), Kyushu Museum of Natural History (KMNH), National Taiwan Ocean University (NTOU), Queensland Museum, Brisbane (QM), Zoological collections, Tel Aviv University (TAU); Universi- ty Museum of Zoology, Cambridge (UMZC), Western Australian Museum, Perth (WAM), Zoological Museum, Amsterdam (ZMA), and the Zoological Museum, Uni- versity of Copenhagen (ZMUC) has enabled re-examination of many type specimens and much of the published material and led to a revision of the Indo-Pacific leucosioid ZM 75 409-446 | 24 (galil) 12-01-2007 08:08 Page 410 410 Galil. A revision of MyraLeach. Zool. Med. Leiden 75 (2001) A B C D E F Fig. 1. A, Myra affinis Bell, 1855, 26.1 mm cl, NHM 1907.5.22.32; B,M. australisHaswell, 1880, 17.3 mm cl, WAM c7727; C, M. brevimanaAlcock, 1896, 16.2 mm cl, MNHN B18997; D, M. celerisspec. nov., 31.1 mm cl, NTOU; E, M. currax spec. nov., paratype, 24.2 mm cl, ZMUC; F, M. curtimana spec. nov., paratype, 21.4 mm cl, MNHN. genus Myra Leach, 1817. A new genus, Myrine, is established for M. acutidens (Ihle, 1918) and M. kesslerii (Paulson, 1875). The genus Myrodes Bell, 1855, is synonymized with Myra. Nine species are retained as valid: M. affinis Bell, 1855, M. australis Haswell, 1879, M. brevimana Alcock, 1896, M. elegans Bell, 1855, M. eudactyla (Bell, 1855), M. fugax(Fabricius, 1798), M. grandis Zarenkov, 1990, M. mammillarisBell, 1855 and M. subgranulata Kossmann, 1877. Five new species are established: M. celeris, M. curtimana, M. currax, M. pernixand M. tumidospina. Distributional information for the majority of Myra species is uncertain. Although ZM 75 409-446 | 24 (galil) 12-01-2007 08:08 Page 411 Galil. A revision of MyraLeach. Zool. Med. Leiden 75 (2001) 411 A B C D E F Fig. 2. A, Myra elegans, Bell, 1855, 16.1 mm cl, MNHN B18012; B, M. eudactyla(Bell, 1855), 20.5 mm cl, MNHN B21029; C, M. fugax(Fabricius, 1798) 31.1 mm cl, MNHN; D, M. grandisZarenkov, 1990, 37.1 mm cl, MNHN B19741; E,M. mammillarisBell, 1855, 38.5 mm cl, QM W2054; F,M pernixspec. nov., holotype, 24.5 mm cl, ZMUC. the body of litterature abounds with distributional records, many of these are suspect due to faulty identifications. The distribution records given below as part of the species account are conservative in an attempt to eliminate misleading or erroneous information. All species are described and illustrated, extended synonymies are given, and a key for their identification is provided. The abbreviation cl is used for carapace length along the median line, excluding the intestinal spine. ZM 75 409-446 | 24 (galil) 12-01-2007 08:08 Page 412 412 Galil. A revision of MyraLeach. Zool. Med. Leiden 75 (2001) A B C D Fig. 3. A, Myra subgranulataKossmann, 1877, 34.7 mm cl, TAU; B,M. tumidospinaspec. nov., 29.7 mm cl, MNHN; C,Myrine acutidens (Ihle, 1918), 11.9 mm cl, KBIN IG25715; D, M. kesslerii(Paulson, 1875), 24.7 mm cl, NHM 1884.31. Key to species of the genera Myraand Myrine 1. Well-defined beaded line along lateral margins of carapace; subhepatic denticle present; outer maxilliped endopod in female bearing vertical row of setae; anterior margin of efferent branchial channel forming lower orbital margin ................Myra3 - Lateral margins of carapace lacking beaded line; subhepatic denticle lacking; outer maxilliped endopod in female lacking vertical row of setae; anterior margin of efferent branchial channel distinct, separated from lower orbital margin by groove .....................................................................................................................................Myrinegen. nov. 2 2. Median denticle on posterior margin of carapace elongate, acuminate; apical process on first male pleopod lamellate, subrectangular .................Myrine acutidens - Median denticle on posterior margin of carapace petaloid; apical process on first male pleopod squat ...............................................................................................Myrine kesslerii 3. Carapace elongate, ovate, slightly convex; lacking subhepatic denticle, and branchial notch ..............................................................................................................Myra elegans - Carapace rounded, globose; subhepatic denticle and branchial notch present ..........4 4. Subhepatic margin rounded; ogival apical process on first male pleopod..................... .............................................................................................................................................Myra australis Subhepatic margin faceted; apical process on first male pleopod otherwise..................5 5. Palm pyriform; cheliped dactyl twice as long as palm .........................Myra eudactyla ZM 75 409-446 | 24 (galil) 12-01-2007 08:08 Page 413 Galil. A revision of MyraLeach. Zool. Med. Leiden 75 (2001) 413 - Palm elongate, subcylindrical; cheliped dactyl not longer than palm ..........................6 6. Carapace smooth, shiny; margins of abdominal sulcus smooth............Myra grandis - Carapace granulate; margins of abdominal sulcus beaded subdistally .......................7 7. Cheliped merus in male less than carapace length .................................................................8 - Cheliped merus in male more than carapace length ...........................................................11 8. Cheliped dactyl as long as upper margin of palm, or longer ............................................9 - Cheliped dactyl 3/4as long as upper margin of palm ..........................................................10 9. Carapace and chelipeds finely granulate; apical process of first male pleopod sickle-shaped ...................................................................................................................Myrabrevimana Carapace and chelipeds coarsely granulate; apical process of first male pleopod curved, distally foliolate ...............................................................Myra curtimanaspec. nov. 10. Median posterior carapacial denticle acuminate, more prominent than lateral denticles; third thoracic sternite in male bearing horizontal granulate band; abdominal margins in female granulate .....................................................................................Myra affinis Posterior carapacial denticles subequal; third thoracic sternite in male lacking granulate band; abdominal margins in female smooth .................Myra mammillaris 11. Median posterior spine in male third as long as carapace; lateral posterior denticles acuminate .........................................................................................................................................12 Median posterior spine in male fifth as long as carapace; lateral posterior denticles triangular ..................................................................................................................................................13 12. Cheliped merus in male 1.2 as long as carapace; apical process of first male pleopod foliate, notched on interior margin .........................................Myrapernixspec. nov. Cheliped merus in male 1.4 as long as carapace; apical process with slender neck, distally lamellate, petaloid ...................................................................Myracurraxspec. nov. 13. Median posterior spine greatly swollen proximally; external denticle on anterior margin of efferent branchial channel prominent; lateral margins of fused segments of male abdomen distally sinuous ......................................Myra tumidospinaspec. nov. - Median posterior spine slightly thickened proximally; denticles on anterior margin of efferent branchial channel subequal; lateral margins of fused segments of male abdomen distally straight ......................................................................................................14 14. Cheliped merus in male 1.1 as long as carapace; cheliped dactyl as long as upper margin of palm; apical process of first male pleopod curved distad, distally vul- vate ...........................................................................................................................................Myra fugax Cheliped merus in male 1.5 as long as carapace; cheliped dactyl half as long as upper margin of palm; apical process of first male pleopod curved distad, subter- minal denticle on interior margin .....................................................Myra celerisspec. nov. - Cheliped merus in male 1.4 as long as carapace; cheliped dactyl 0.7 as long as upper margin of palm; apical process of first male pleopod curved distad .................. ...................................................................................................................................Myra subgranulata MyraLeach, 1817 MyraLeach, 1817: 23; Desmarest, 1825: 169; H. Milne Edwards 1837: 125; Bell, 1855a: 364; Bell, 1855b: 296; Bell, 1855c: 12; A. Milne Edwards, 1874: 45; Miers, 1886: 312; Alcock, 1896: 200; Klunzinger, 1906: 73; Ihle, 1918: 255; Serène, 1955: 179; Barnard, 1950: 372; Tirmizi & Kasmi, 1988: 89. MyrodesBell, 1855a: 364; Bell, 1855b: 298; Bell, 1855c: 13; Miers, 1886: 297; Alcock, 1896: 254; Ihle, 1918: ZM 75 409-446 | 24 (galil) 12-01-2007 08:08 Page 414 414 Galil. A revision of MyraLeach. Zool. Med. Leiden 75 (2001) 261; Serène, 1955: 199; Tyndale-Biscoe & George, 1962: 87. Syn. nov. PersephonaRathbun, 1902: 30. Type species.— Leucosia fugaxFabricius, 1798, by monotypy; gender: feminine. Diagnosis.— Carapace ovate or rounded; regions of carapace indistinct. Dorsal surface of carapace smooth or granulate. Front narrow, well delimited, medially notched. Antennular fossa continuous with orbit, partially sealed by basal plate on antennule; antennules fold obliquely within fossa. Antennae short, inserted between antennular fossa and orbit. Orbits small, outer orbital margin trisutured, tridentate anterior margin of efferent branchial channel forms lower orbital margin. Eyes retractible. External maxillipeds concealing buccal opening; endopod merus triangu- late, shorter than rectangular ischium; vertical row of setae on endopod in female. Lat- eral margins of carapace, from outer angle of efferent branchial channel to lateral posterior denticle, lined with closely-spaced granules. Lateral posterior denticles on lower plane than median posterior spine. Chelipeds slender, long, subequal, longer in adult male than in female specimens; fingers curved distally, their inner margins ctenoid. Pereiopods slender, dactyls styliform, setose, longer than propodi. Abdominal sulcus deep, elongate, nearly reaching buccal cavity. Male abdomen narrowly triangular; segments 3-6 fused, bearing preapical denticle; lateral margin bearing 3 indistinct ridges fitting into sutures between thoracic sternites; telson lingulate, fifth as long as fused segment. Female abdomen with segments 4-6 fused, greatly enlarged, shield- like, telson laciniate. First male pleopod elongate, shaft straight or slightly sinuous, dorso-ventrally flattened, bearing ruff of setae preapically, apical process slender, cor- nute. Second male pleopod short, curved, apex scoop-like. Remarks.— Bell (1855b: 298) separated Myrodesfrom Myramostly because of ‘the form and length of the anterior legs’. Already A. Milne Edwards (1874: 45) observed “M. Bell a formé un genre particulier (Myrodes) pour un espèce qui ne diffère des Myra que par la forme des pattes de la première paire, et présente d’ailleurs tous les caractères de ce dernier genre; elle doit donc y être réunie”. Miers (1886: 297), Ihle (1918: 205, 261), and Alcock, (1896: 254) agreed that Myrodes “closely resembles Myra in all details of form”, yet chose to retain it. It is recognized herein as a synonym of Myra. On describing Myra townsendi and M. subovata from the Gulf of California, Rath- bun noted (1893: 256) the species as “very close to Persephona”. Rathbun (1902: 30) con- tended “..that the genus Myra Leach is not distinct from Persephona Leach” and put the former into synonymy with the latter, though she retracted it later (Rathbun, 1937: 151). M. anomala Zarenkov (1990: 62, pl. 5, figs 4-10) does not belong within Myra, as the male abdomen is depicted with an articulate sixth segment. Myra affinis Bell, 1855 (figs. 1a, 4) Myra affinis White, 1847: 49 [nomen nudum]; Bell, 1855a: 364; Bell, 1855b: 296, pl. 32, fig. 2; Bell, 1855c: 12; Miers, 1884: 250 (pro parte); Alcock, 1896: 205 (pro parte); Laurie, 1906: 361; Ihle, 1918: 257; Stephensen, 1945, fig. 7a; Tyndale-Biscoe & George, 1962: 88, fig. 10a, b (pro parte); Serène, 1968: 44 (pro parte). ZM 75 409-446 | 24 (galil) 12-01-2007 08:08 Page 415 Galil. A revision of MyraLeach. Zool. Med. Leiden 75 (2001) 415 4A 4B 5A 5B 6A 6B Fig. 4. Myra affinis Bell, 1855, Lectotype, 31.6 mm cl, NHM 43.6. A, first male pleopod, ventral view; B, first male pleopod, tip, dorsal view. Scale 1 mm. Fig. 5. Myra australisHaswell, 1880, 16.4 mm cl, QM W12059. A, first male pleopod, ventral view; B, first male pleopod, tip, ventral view; C, first male pleopod, tip, dorsal view. Scale 1 mm. Fig. 6. Myra brevimanaAlcock, 1896, 16.4 mm cl, ZMUC.A, first male pleopod, ventral view, B. first male pleopod, tip, ventral view. Scale 1 mm. Persephona affinis; Rathbun, 1910: 308; Laurie, 1915: 409 (pro parte). notMyra affinis; Stimpson, 1858: 160; 1907: 153. [= M. celeris spec. nov.]. notMyra affinis; Miers, 1886: 315; Haswell, 1880: 50; 1882: 121; Campbell & Stephenson, 1970: 250, fig. 11. [= M. mammillaris Bell, 1855]. not Myra affinis; Nobili, 1906a: 165. [= M. subgranulata Kossmann, 1877]. Material.— Lectotype,1 (cid:2)(31.6 mm cl), NHM 43.6, Philippines,Cebu Island, coll. Cuming, designat- ed byTyndale-Biscoe & George, 1962: 88.— Philippines:1 (cid:3)(28.8 mm cl), NHM 43.6, Musbate Island, coll. Cuming.— Indonesia: 2 (cid:2)(15.0, 17.5 mm cl), 3 juveniles, ZMA 242034, Salawatti, 1º10.5’S 130º9’E, 18 m depth, ‘Siboga’ stn 162, 18.viii.1899; 1 (cid:2)(17.4 mm cl), 1 (cid:3)(20.7 mm cl), ZMA 242029, east coast of Sumbawa, Sapeh Bay, 8º30’S 119º7.5’E, 36 m depth, ‘Siboga’ stn 311, 12-13.ii.1900; 3 juveniles, ZMA 242028, Saleh Bay, 8º19’S 117º41’E, 36 m depth, ‘Siboga stn 313, 14-16.ii.1900.— Thailand: 1 (cid:2) (21.8 mm cl), USNM 39639, Koh Kram, 55 m, 2-21.iii.1900, coll. Th. Mortensen, det. M. J. Rathbun as Perse- phone affinis; 4 (cid:2)(24.2-30.8 mm cl), 2 (cid:3)(23.7, 23.8 mm cl), RMNH D 38712, Chonburi province, Laem Chabang, near Si Racha, 10 m depth, 11.i.1991, colls. A.C.J. Burgers & L.B. Holthuis.— Sri Lanka: 1 (cid:2) (26.1 mm cl), NHM 1907.5.22.32, coll. W.A. Herdman; 3 (cid:2)(12.0-16.2 mm cl), 5 (cid:3)(17.1-25.4 mm cl), NHM 1907.5.22.33-37, Gulf of Manaar, Pearl Bank, coll. W. A. Herdmann; 3 juveniles, NHM 1934.1.16.36-37, Trincomalee, coll. Miss Herdman. Description.— Carapace rounded, globose, dorsal surface prominently granulate. Front produced, upcurved, anterior margin v-shaped, granulate. Hepatic region ZM 75 409-446 | 24 (galil) 12-01-2007 08:08 Page 416 416 Galil. A revision of MyraLeach. Zool. Med. Leiden 75 (2001) raised, bearing granulate line. Faceted subhepatic margin terminates in blunt, granulate denticle, separated from convex lateral margin by shallow notch. Lateral margins of carapace prominently beaded. Lateral posterior denticles rounded, granulate. Median posterior spine in male 0.1 as long as carapace; triangular, granulate, slightly upcurved. Denticles on anterior margin of efferent branchial channel subequal. External maxillipeds minutely granulate. Cheliped merus in male up to 0.75 as long as carapace, in female two-thirds carapace length; proximally set with perliform granules, granules smaller distally. Carpus and propodus minutely granulate. Dactyl three-quarters as long as upper margin of palm. Pereiopodal propodi ovate. Third thoracic sternite in male anteriorly granulate in addition to horizontal granulate band. Subdistal margins of abdominal sulcus beaded. Laciniate denticle near distal margin of fused abdominal segments of male. Fused segments of female abdomen bearing granulate band proximally, margins unevenly granulate. Male first pleopod nearly straight, apical process digitate, curved distad. Remarks.— M. affinis closely resembles M. mammillaris in having a prominently granulate carapace, the cheliped merus in male less than the carapace length and the cheliped dactyl 6 as long as the upper margin of the palm. The latter species is often mistaken for the former, especially when only immature specimens were available (Miers, 1886: 315; Tyndale-Biscoe & George, 1962: 88). M. affinisis easily distinguished from M. mammillaris as its median posterior carapacial denticle is acuminate rather than petaloid, the third thoracic sternite in the male bears an horizontal granulate band, and abdominal margins in female are granulate. Distribution.— Philippines, Indonesia, Thailand, Sri-Lanka; 10-36 m depth. Myra australisHaswell, 1880 (figs. 1b, 5) Myra australisHaswell, 1880: 50, pl. 5, fig. 3; Haswell, 1882: 122; Miers, 1884: 251; Miers, 1886: 315; Cal- man, 1900: 27; Tyndale-Biscoe & George, 1962: 88, fig. 7.11; Serène, 1968: 44; Campbell & Stephen- son, 1970: 250, fig. 12. not Myra australis;Walker, 1887: 111; Henderson, 1893: 402;Lanchester, 1900: 766. Material.— Australia: 2 (cid:2)(13.9, 13.1 mm cl), 1 juvenile, NHM 1882.7, Port Molle, 26 m depth, ‘Alert’ stn 93, coll. Coppinger, det. E. J. Miers; 1 (cid:3)(14.1 mm cl), NHM 1881.31, Queensland, Port Denison, 7 m depth, ‘Alert’ stn 122; 1 (cid:2)(15.3 mm cl), NHM 1882.7, Prince of Wales Channel, 13 m depth, ‘Alert’ stn 142, coll. Coppinger, det. E. J. Miers; 1 (cid:2)(12.5 mm cl), NHM 1882.7, Prince of Wales Channel, 16.5 m depth, ‘Alert’ stn 157, coll. Coppinger, det. E. J. Miers; 2 (cid:3)(19.0, 15.1 mm cl), NHM 1882.7, Thurs- day Island, 7-9 m depth, ‘Alert’ stn 165, coll. Coppinger, det. E. J. Miers; 1 (cid:2) (18.5 mm cl), NHM 1882.7, Thursday Island, 5.5-7 m depth, ‘Alert’ stn 177, coll. Coppinger, det. E. J. Miers; 1 (cid:2)(17.8 mm cl), NHM 1884.31, Torres Strait, 10°36.0’S 141°55.0’E, 11 m depth, ‘Challenger’ stn 187, det. E. J. Miers; 1 (cid:3)(19.0 mm cl), NHM 1954.9.14.88, Torres Strait, coll. A.C. Haddon, det. W.T. Calman; 2 (cid:3)(13.5, 15.8 mm cl), NHM 1931.4.14.31-32, Queensland, Albany passage, coll. M. Ward; 1 (cid:2) (16.4 mm cl), QM W12059, Moreton Bay, Peel Island, xi.1974; 1 (cid:2)(20.0 mm cl), 1 (cid:3)ovigerous (18.2 mm cl), QM W11834, Moreton Bay, Peel Island, 26.i.1985; 1 (cid:3) (20.7 mm cl), WAM c19112, Queensland, Port George, 5 m depth, 12.vii.1988; 1 (cid:3), 6 juveniles, QM W23326, North West Shelf, 19°55.9’S 117°55.5’E, 42-43 m depth, 26.vi.1983; 1 (cid:2)(9.6 mm cl), 1 (cid:3)(11.2 mm cl), WAM c7726, Dampier Archipelago, Steamboat Island, ZM 75 409-446 | 24 (galil) 12-01-2007 08:08 Page 417 Galil. A revision of MyraLeach. Zool. Med. Leiden 75 (2001) 417 27.v.1960; 1 (cid:2)(14.3 mm cl), WAM c7725, Eagle Hawk Island, 25.6 m depth, 14.vi.1960, coll. B.R. Wil- son; 1 (cid:2)(17.3 mm cl), WAM c7727, Dampier Archipelago, 2.vi.1960. Description.— Carapace rounded, globose; dorsal surface of carapace closely set with flattened granules. Front slightly produced, upturned, weakly bilobed. Protogas- tric region depressed, hepatic region swollen. Subhepatic margin rounded, subhepatic denticle prominent, granulate, separated from convex lateral margin by distinct notch. Lateral margins of carapace beaded. Lateral posterior denticles rounded, dorsoventrally flattened, granulate. Median posterior denticle triangular, as wide as long, granulate, distally upcurved. Intestinal region slightly swollen; juvenile specimens with prominent granule medially on intestinal region. Denticles on anterior margin of efferent branchial channel subequal. External maxillipeds closely set with flattened granules. Cheliped merus in male 0.7 as long as carapace, in female slightly less; granulate, granules smaller distally. Carpus, propodus minutely granulate; propodus basally swollen, upper margin ridged. Dactyl three-quarters as long as upper margin of palm, minutely granulate. Lower margin of pereiopodal meri, and upper margin of propodi granulate. Thoracic sternum closely set with flattened granules, granules more prominent medially on third sternite. Fused segments of male abdomen bearing hoof-like denticle distally. Fused segments of female abdomen bearing granulate band proximally, margins granulate. Male firstpleopod nearly straight, apical process ogival. Colour.— “Carapace marked with variously disposed blotches of orange; the proximal half of the upper surface of the arm, and the articulations of the ambulatory limbs marked with the same colour, of which also two circular spots occur on the upper surface of the third joint of the ambulatory limb” (Haswell, 1880: 51). Remarks.— M. australis is unique among its cogeners in having a rounded rather than faceted subhepatic margin, a hoof-like denticle distally on the fused segment of the male abdomen, and an ogival apical process on the first male pleopod. Distribution.— Australia; 5-57 m depth. Myra brevimana Alcock, 1896 (figs. 1c, 6) Myra brevimana Alcock, 1896: 206; Alcock & Anderson, 1897, pl. 29, fig. 8; Borradaile, 1903: 438; Laurie, 1906: 361; Serène, 1968: 44 (pro parte). Persephona brevimana; Rathbun, 1911: 201. notMyra brevimana; Ihle, 1918: 258.[= M. curtimana spec. nov.] Material.— India: 1 (cid:2)(16.9 mm cl), 1 (cid:3)ovigerous (18.2 mm cl), NHM 1896.9.8.18-19, ex. Indian Muse- um 915/10, Madras, 36.5-55 m depth.— Sri Lanka: 1 (cid:3)(26.6 mm cl), NHM 1907.5.22, coll. W.A. Herd- man; 1 broken, NHM 1955.4.4.10, ex. Indian Museum, 62 m depth; 1 (cid:2)(16.4 mm cl), ZMUC, ex. Indian Museum, 62 m depth, v.1898, det. A. Alcock; 2 (cid:3)(17.6, 15.4 mm cl), NHM 1934.1.16.38, Gulf of Man- aar, coll. Miss Herdman; 2 (cid:2)(15.6, 17.1 mm cl), 2 (cid:3)(12.1, 20.8 mm cl), NHM 1907.5.22.38, off Kaltura, coll. W.A. Herdman.— Maldive Islands: 1 juvenile, UMZC, Kolumadulu Atoll, coll. J.S. Gardiner; 1 (cid:2) (12.6 mm cl), UMZC, South Nilandu Atoll, coll. J.S. Gardiner.— Seychelles: 1 (cid:2)(15.5 mm cl), 1 (cid:3)(15.2 mm cl), MNHN B18985, 5°05.4’S 55°54.4’E, 58 m depth, REVES II stn 11, 7.ix.1980; 1 (cid:3)ovigerous (15.5 mm cl), MNHN B19009, 5°05.4’S 55°54.4’E, 58 m depth, REVES II stn 11, 7.ix.1980; 1 (cid:3)ovigerous (21.4 ZM 75 409-446 | 24 (galil) 12-01-2007 08:08 Page 418 418 Galil. A revision of MyraLeach. Zool. Med. Leiden 75 (2001) mm cl), MNHN, 5°44.8’S 56°39.1’E, 55 m depth, REVES II stn 17, 5.ix.1980; 2 juveniles, MNHN B18992, 5°16.3’S 55°58.2’E, 60 m depth, REVES II stn 22, 6.ix.1980; 1 (cid:2)(16.2 mm cl), MNHN B18997, 4°44.0’S 54°38.3’E, 56 m depth, REVES II stn 29, 9.ix.1980; 1 (cid:3)ovigerous (17.1 mm cl), MNHN B18984, 4°37.4’S 54°20.7’E, 50 m depth, REVES II stn 31, 9. ix.1980; 1 (cid:2) (14.0 mm cl), 1 (cid:3) ovigerous (20.8 mm cl), MNHN B19014, 4°31.6’S 56°09.7’E, 55-60 m depth, REVES II stn 42, 13. ix.1980; 1 (cid:3)ovigerous (20.4 mm cl), MNHN B19012, 4°03.8’S 55°59.5’E, 45-55 m depth, REVES II stn 47, 14. ix.1980; 1 (cid:3)ovigerous (17.1 mm cl), MNHN B18981, 3°54.7’S 55°50.6’E, 57 m depth, REVES II stn 49, 15. ix.1980; 1 juvenile, MNHN B19006, 3°52.8’S 55°25.3’E, 60 m depth, REVES II stn 52, 16.ix.1980. Description.— Carapace rounded, globose; dorsal surface of carapace set with perliform granules. Front produced, upturned, minutely granulate, margin v-shaped. Hepatic region swollen, surmounted by granulate tubercle. Faceted subhepatic margin terminates in prominent, granulate denticle, separated from convex lateral margin by distinct notch. Lateral margins of carapace beaded. Lateral posterior denticles equi- lateral triangles, dorsoventrally flattened, granulate. Median posterior spine acuminate, longer than lateral denticles, basally granulate, distally upcurved. Juvenile specimens with 2 prominent granules on branchial margins, prominent granule medially on intestinal region. External denticle on anterior margin of efferent branchial channel slightly prominent. External maxillipeds sparsely granulate. Cheliped merus in male 0.9 times as long as carapace, in female 0.7 times as long as carapace; granulate, granules smaller distally. Carpus, propodus, and dactyl minutely granulate, propodus basally swollen, dactyl as long as superior margin of palm. Pereiopods nearly smooth. Thoracic sternum of male laterally granulate, margins of abdominal sulcus beaded subdistally. Fused segments of male abdomen proximally granulate, bearing laciniate denticle medially near distal margin; telson 0.2 times as long as fused segments. Fused segments of female abdomen bearing granulate band proximally. Male first pleopod nearly straight, apical process sickle-shaped. Colour (preserved specimens).— “Regions of carapace defined by broad orange- red markings, some broad orange-red cross-bands on chelipeds, one of which occu- pies the basal half or three-fourths of the fingers” (Alcock, 1896: 297). Remarks.— M. brevimanadiffers from the closely allied M.curtimana spec. nov. in its more delicate granulation on the carapace and chelipeds, and the sickle-shaped apical process of the first male pleopod. Distribution.— India, Sri Lanka, Maldive Islands, Seychelles; 36-80 m depth. Myra celerisspec. nov. (figs. 1d, 7) Cancellus Anatum Tertius Rumphius, 1741: 27, pl. 10, fig. C. Myra fugax; de Haan, 1841: 134, pl. 33, fig. 1; White, 1847: 49 (pro parte); Stimpson, 1858: 160; Herklots, 1861: 27; A. Milne Edwards, 1874: 45; Miers, 1886: 313; Ortmann, 1892: 581; Stimpson, 1907: 152; de Man, 1907: 397; Parisi, 1914: 295; Balss, 1922: 127; Rathbun, 1923: 136; Gee, 1925: 161; Shen, 1931: 108, pl. 10, fig. 2; Yokoya, 1933: 126; Boone, 1934: 39, pl. 12; Sakai, 1934: 285; Sakai, 1935: 57, pl. 10, fig. 2; Sakai, 1937: 134, pl. 14, fig. 5; Lin, 1949: 14; Uchida, 1949: 719, fig. 2081; Utinomi, 1956: 72, pl. 35, fig. 5; Holthuis, 1959: 104, pl. 8, fig. 5; Miyake, 1961a: 14; Miyake, 1961b: 170; Miyake et al., 1962: 126; Chang, 1963: 2; Sakai, 1965: 43, pl. 17, fig. 3; Holthuis & Sakai, 1970: 118, pl. 11, fig. 1;