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The Deep-Sea Shrimps of the Family Oplophoridae (Crustacea: Decapoda) from Taiwan*

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The Deep-Sea Shrimps of the Family Oplophoridae (Crustacea: Decapoda) from Taiwan* unuo I MuLM LJij;iA, f "T^n - H^Uamc^ -Poit^ ^^^ SMITHSONIAN 0 J RETURN, V, - ASIAN MARINE BIOLOGY (1986). 3: pp 89-99 THE DEEP-SEA SHRIMPS OF THE FAMILY OPLOPHORIDAE (CRUSTACEA: DECAPODA) FROM TAIWAN* Tin-Yam Chan and Hsiang-Ping Yu Department of Aquaculture; and Graduate School of Fisheries; National Taiwan College of Marine Science and Technology, Keelung, 200 Taiwan, Republic of China. Abstract This paper reports upon four species of deep-sea oplophorid shrimps collected off north-east and southern Taiwan at depths of about 100-450 m. All are new to the marine fauna list of Taiwan. Oplophorus gracilirostris and Oplophorus typus are found to have the ability to lock the laterally extended scaphocerites. A key is given for their identification and their colours are fully illustrated. Sexual differences are also discussed. Introduction Materials and Methods Most oplophorids are well-known bathypelagic All the specimens were obtained from local fish shrimps that have the ability to luminesce and markets at fishing harbours and were said to be exhibit vertical migration. Interestingly, a num- caught at about 100-450 m depth off north-east ber of specimens belonging to this family have and southern Taiwan. Reference specimens are been obtained from the coastal shrimp fishery deposited in the Fisheries Department of the and are used by local fishermen as part of the National Taiwan College of Marine Science and natural food in the fish and prawn culture in- Technology. The stated measurement is body dustry. In the present paper, four oplophorid length which was measured from the postorbital species are described from our collections, margin to the posterior margin of the telson namely: Oplophorus typus H. Milne Edwards, with the specimen outstretched. 1837, Oplophorus gracilirostris A. Milne Ed- wards, 1881, Oplophorus spinicauda A. Milne Key to the genera of Oplophoridae from Edwards, 1883 and Systellaspis pellucida Taiwan: (Filhol, 1885). All have the same local name "spiny shrimp" and are new to the fauna list of A. Exopods of all thoracic appendages conven- Taiwan. The first two species have the ability to tionally slender; outer margin of scaphocer- lock their laterally extended scaphocerite by ite smooth; abdominal somite VI never dor- unique structures on the scaphocerite and the sally carinate Systellaspis Bate, 1888 basicerite. This report includes descriptions of B. Exopods of maxilliped III and pereiopod I the external characteristics and the sexual dif- foliaceous; outer margin of scaphocerite ferences of these shrimps, together with keys usually spinous (all Taiwan species with out- and colour illustrations. Restricted synonymies er margin of scaphocerite spinous) are also provided. Oplophorus H. Milne Edwards, 1837 * Contribution No. 975-0409-B019-01 from the National Science Council, Republic of China. T.Y. Chan & H.P. Yu Genus Systellaspis Bate, 1888 Chan leg.: 14 October 1984; 1 6 54 mm, 4 Systellaspis pellucida (Filhol, 1885) ovigerous 9 9 57—62 mm. 31 December (Plate IA; Figure 1) 1984; 1 ovigerous 9 59 mm, 1 9 60 mm. 26 March 1985; 4 ovigerous 9 9 54-56 mm, 25 Acanthephyra pellucida .. Filhol, 1885: 144, 9 9 52-57 mm. 8 May 1985; 1 6 52 mm, 5 162. obvigerous 9 9 50-53 mm, 5 9 9 48-52 Systellaspis affinis Des Man, 1920: 43; mm. 14 July 1985; 3 66 41-44 mm, 4 9 9 Chace, 1936: 29; Caiman, 1939: 190; De- 47—50 mm. Tong-Kang, Ping-Tong County; nnell, 1940: 345; Chace, 1947: 39, fig. 3; Chan leg.: 31 October 1984; 2 ovigerous 9 9 Crosnier and Forest, 1968: 1133. 56 and 62 mm. 2 December 1984; 2 oviger- ? not Systellaspis lanceocaudata Bate, 1888 ous 9 9 56 and 62 mm. 2 December 1984; 3 Balss, 1925: 243, figs. 12, 13. 9 9 51—58 mm. Su-Ao, I-Lan County; Chan Systellaspis pellucida Crosnier and Forest, leg.: 3 May 1985; 2 ovigerous 9 9 51 and 52 1973: 92, figs. 26c, 27c. mm, 2 9 9 52 and 53 mm. • 'Material Examined': Ta-Chi, I-Lan County; Body slender and shell flexible. Rostrum Fig Systellaspis pellucida. A, Pleopod II of male (X 12.5); B, Abdominal pleura I and II of male (X 12.5); C, Abdominal pleura I and II of female (X 12.5). 90 $ D o o TD 0 Plate I. A, Lateral view of a 53 mm ovigerous female of Systellaspis pellucida, showing partly scarlet and partly 01 CO white eggs; B, Lateral view of a 47 mm ovigerous female of Oplophorus spinicauda, showing near u- vo hatching white eggs; C, Lateral view of a 56 mm ovigerous female of Oplophorus gracilirostris, showing scarlet eggs; D, Lateral view of a 39 mm female of Oplophorus typus. 3 "O T.Y. Chan & H.P. Yu armed dorsally with 4—6 (usually 6) teeth rudimentary median elevation is visible on and ventrally with 4—6 (usually 5) teeth. the abdominal sternites I and II, the pleopods Usually 3—4 post-rostral teeth present. Ros- of the abdominal segment III are widely sepa- trum generally slightly longer than rated and the coxae of the anterior three scaphocerite. No lateral carinae on carapace. pleopods are long, markedly longer than half Expoods of all pereiopods slender. Abdo- the length of the basis. S. pellucida is relative- minal tergites III, IV and V produced into ly larger than other local oplophorids and short but acute spine posteriorly. Hind mar- more numerous off north-eastern Taiwan. gins of abdominal tergites IV and V not se- rrated laterally. Dorsal midline of abdominal Genus Oplophorus H. Milne Edwards, 1837 tergite VI and anterior telson rounded or flattened, not sulcate. Telson more or less as Key to the species of Oplophorus from Taiwan: long as uropods (slightly shorter in some 1. Abdominal somites II, III and IV produced specimens). Eggs few, ranging from 6—18 into overhanging spine posteriorly per ovigerous female, large and beanshaped, Oplophorus spinicauda about 2x3 mm. A Milne Edwards, 1883 • Colour: Generally transparent but covered Abdominal somites III, IV and V produced with scattered scarlet spots. Eye brown-red. into overhanging spine posteriorly 2 Internal organs inside carapace and eggs scar- 2. Rostrum provided with teeth near tip of let. Carapace with violet-blue longitudinal scaphocerite; posterior spine of abdominal bars (photophores) near ventral margin. somite V shorter than IV Thoracic appendages, bases of pleopods and Oplophorus gracilirostris posterior margins of posterior three abdomin- A. Milne Edwards, 1881 al segments vermilion. Photophores of deep Rostrum devoid of teeth near tip of purple colour. scaphocerite; posterior spine of abdominal • Distribution: World wide tropical seas: somite V longer than IV Philippines, Malay Archipelago, West Oplophorus typus Africa, Bahamas, West Indies, China Sea and H. Milne Edwards, 1837 Zanzibar. • Remarks'. Detailed morphological figures Oplophorus spinicauda A. Milne Edwards, have been given by Crosnier and Forest 1883 (1973). The distribution and structure of the (Plate IB; Figure 2) photophores have been extensively studied by Caiman (1939) and Dennell (1940). The male Oplophorus spinicauda A. Milne Edwards, specimens investigated in this study possess 1883: pi. 30; Chace, 1936: 30; Chace, 1940: an appendix masculina on the endopod of the 184, fig. 54; Chace, 1947: 42; Hayashi and pleopod II and both appendix interna and Miyake, 1969: 68; Crosnier and Forest, appendix masculina are translucent and slen- 1973: 24; Hanamura, 1979: 171; Miyake, der. The sex of the species can be somewhat 1982: 174. determined from the outline of the abdominal Oplophorus foliaceus Rathbun, 1906: 922, pleuron I, where the lower margin is concave pi. 20 fig. 8. in the male but is nearly straight in the Hoplophorous spinicauda De Man, 1920: 42. female. Moreover, in males, a median blunt Hoplophorus foliaceus Balss, 1925: 249. protuberance is present on the abdominal sternites I and II, the pleopods of the abdo- • Material Examined: Tong-Kang, Ping-Tong minal segment III are very close to each other County: 27 January 1983; 1 9 43.5 mm. Yu and the coxae of the anterior three pleopods leg. 31 October 1984; 4 ovigerous 9 9 43-47 are relatively short, about half the length of mm. 2 December 1984; 1 8 32 mm, 17 the basis. However, in females only a ovigerous 8 6 42-54 mm. 26 March 1985; 1 92 "laiWcin Oplophorid Shrimps the lower margin of the abdominal pleuron I, which is concave and rough in males whereas it is horizontally straight and smooth in females. No median protuberance is present on the abdominal sternites I and II of either sex but the appearance of the coxae of the anterior three pleopods are similar to those of S. pellucida. This species closely resem- bles S. pellucida and is very different from other Oplophorus species in the general body shape, soft integument, non-rigid ex- opods of the pereiopods, shape of the ros- A, Scaphocerite, latero-ventral view (X 12.5); trum and telson, and the outline of the abdo- Lateral view of scaphocerite minal pleuron I in each sex. Moreover, the and basicerite (X 12.5); appearance of the appendix interna is also S 26 mm, 2 ovigerous 9 9 44 and 45 mm. 28 thin and slender. Additional to lacking the July 1985; 3 ovigerous 9 9 45-47 mm. Chan ability to lock the scaphocerite as in other leg. Oplophorus species reported upon in this Body slender and shell flexible. Rostrum paper, it appears rather unsuitable to place always with 8 teeth above and 7 teeth below, this species in the genus Oplophorus only on extending slightly beyond scaphocerite. Post- account of the characteristic foliaceous ex- rostral carina usually provided with 4 teeth. opods of the pereiopods, as this character is Outer margin of scaphocerite armed with somewhat vague.
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