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New Report on Two Species of Hippolytid Shrimps (Crustacea: Decapoda: Caridea) Collected at Sea Cucumber Farm, East Sea, Korea
New Report on Two Species of Hippolytid Shrimps (Crustacea: Decapoda: Caridea) Collected at Sea Cucumber Farm, East Sea, Korea
Animal Systematics, Evolution and Diversity. 2014. Apr, 30(2): 144-150
Copyright © 2014, The Korean Society of Systematic Zoology
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
  • Received : December 12, 2013
  • Accepted : February 02, 2014
  • Published : April 30, 2014
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About the Authors
Chu Lee
East Sea Fisheries Research Institute, National Fisheries Research & Development Institute, Gangneung 210-861, Korea
Myung-mo Nam
East Sea Fisheries Research Institute, National Fisheries Research & Development Institute, Gangneung 210-861, Korea
Hyun Sook Ko
Department of Biological Sciences, Silla University, Busan 617-736, Korea
Kyu Hyun Lee
Tidal Flat Research Institute, National Fisheries Research & Development Institute, Gunsan 573-882, Korea
E-mail: celllove81@gmail.com
Abstract
Two species of hippolytid shrimps, Eualus kuratai Miyake and Hayashi, 1967 and Heptacarpus igarashii Hayashi and Chiba, 1989, were collected at a sea cucumber farm from the East Sea. These species are described and illustrated for the first time in Korea. Eualus kuratai is closely related to E. middendorffi ; however, it lacks a dorsomedian spine on the fourth and fifth abdominal somites. Heptacarpus igarashii can be easily distinguished from other Korean Heptacarpus species due to its short rostrum that lacks ventral teeth on margin. This report extends the previously known ranges from Japan and Korea. In Korea, both genera, Eualus and Heptacarpus , have seven species according to the present report, respectively; moreover, hippolytid shrimps now consist of 31 species of nine genera.
Keywords
INTRODUCTION
The genus Eualus Tallwitz, 1892 is characterized by carapace without a supraorbital spine and with the third maxilliped having an exopod and no arthrobranch ( Kim, 2012 ). It includes six species in Korea: E. biunguis ( Rathbun, 1902 ), E. leptognathus ( Stimpson, 1860 ), E. macilentus ( Krøyer, 1841 ), E. middendorffi Bražnikov, 1907 , E. sinensis ( Yu, 1931 ), and E. spathulirostris ( Yokoya, 1933 ). The genus Heptacarpus Holmes, 1900 is characterized by carapace without supraorbital spine and an elongated third maxilliped without an exopod ( Kim, 2012 ). It consists of six species: H. acuticarinatus Komai and Ivanov, 2008 , H. futilirostris ( Bate, 1888 ), H. geniculatus ( Stimpson, 1860 ), H. jordani ( Rathbun, 1902 ), H. pandaloides ( Stimpson, 1860 ), and H. rectirostris ( Stimpson, 1860 ) (see The Korean Society of Systematic Zoology, 1997 ; Cha et al., 2001 ; Yang and Kim, 2005 ; Kim and Choi, 2006 ; Kim et al., 2006 ; Kim, 2012 ).
During a survey in the area of sea cucumber farms, a number of small crabs and shrimps were collected. Among the shrimps caught, two species of hippolytid shrimps, Eualus kuratai Miyake and Hayashi, 1967 and Heptacarpus igarashii Hayashii and Chiba, 1989 , are new to the Korean shrimp fauna. Therefore, they are described and illustrated with color photographs.
Postorbital carapace length is abbreviated as “CL”. CL is an indication of the size of the specimen and is measured from the posterior margin of the orbit to the posterior middorsal margin of the carapace. Specimens were preserved in 95% ethanol. The materials examined in this study were deposited at Silla University in Busan, Korea.
SYSTEMATIC ACCOUNTS
  • Order Decapoda Latreille, 1803
  • Superfamily Alpheoidea Rafinesque, 1815
  • Family HippolytidaeBate, 1888
  • GenusEualusThallwitz, 1892
1*Eualus kuratai Miyake and Hayashi, 1967 (Figs. 1, 2)
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Eualus kuratai, male (CL 8.08 mm). A, Habitus, lateral; B, Carapace, lateral; C, Left antennule, dorsal; D, Right antennal scale, dorsal; E, Left third maxilliped, lateral; E′, Left third maxilliped, distal segment; F, Right 1st pereopod, lateral; G, Left 2nd pereopod, lateral; H, Left 3rd pereopod, lateral; I, Left 4th pereopod, lateral; J, Left 5th pereopod, lateral; K, Telson, dorsal. CL, length of posterior margin of the orbit to the posterior middorsal margin of the carapace. Scale bars: A, B=2 mm, C-K=1 mm, E′=0.5 mm.
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Eualus kuratai, male (CL 8.08 mm). CL, length of posterior margin of the orbit to the posterior middorsal margin of the carapace.
Eualus kuratai Miyake and Hayashi, 1967 : 253, fig. 3; Igarashi, 1969 : 1, Pl. 1, fig. 2j; Bauer, 1984 : 207 (list); Hayashi, 1993 : 313, figs. 244e, 245d; Komai and Komatsu, 2009 : 533, fig. 21A; De Grave and Fransen, 2011 : 417 (list).
Material examined. Korea: 1♂ (CL 8.08 mm), Daejin (Yeongdeok), 6 May 2012, Lee SH, at a sea cucumber farm in approximately 38 m depth.
Description. Body (Figs. 1A , 2) small size. Rostrum (Fig. 1A , B) nearly straight, directed forward, exceeding distal margin of antennular peduncle, dorsal margin with 4 small teeth, including 3 teeth on rostrum proper and 1 postrostral tooth, ventral margin with 6 small teeth. Carapace (Fig. 1A , B) shorter than rostrum; antero-lateral angle with well developed antennal spine; pterygostomian spine present. Abdomen (Fig. 1A) dorsally rounded. Pleuron of third somite with obtusely pointed, but both fourth and fifth somites entirely smooth, without dorsomedian spine; pleuron of fifth somite pointed posteriorly. Telson (Fig. 1A , K) as long as sixth somite, with 4 pairs of spines; 1 pair of plumose setae and 2 pairs of spines terminally, inner pair longer than outer one. Eye (Fig. 1A) cylindrical; eyestalk slightly longer than cornea. Antennular peduncle (Fig. 1C) extending to middle point of rostrum; stylocerite absent. Antennal scale (Fig. 1D) long, extending to rostral apex by inner angle of lamellar tip; equal in breadth at both of proximal and distal parts. Third maxilliped (Fig. 1A , E , E′) overreaching tip of antennular peduncle; exopod well developed. First pereopod (Fig. 1A , F) moderately stout, reaching to second segment of antennular peduncle. Second pereopod (Fig. 1A , G) slender, carpus dividing into 7 articles; chela small. Third pereopod (Fig. 1A , H) reaching forward nearly as far as lateral spine of antennal scale; merus with 3 lateral spines. Fourth pereopod (Fig. 1A , I) similar to third pereopod; merus with 4 lateral spines. Fifth pereopod (Fig. 1A , J) as in fourth pereopod.
Color. Dense red spots over transparent body with scattering of yellow spots. Antennal scale and telson entirely red (Fig. 2) .
Distribution. Japan, Between Rishiri Island and Rebun Island, Hokkaido, 100-150 m deep ( Miyake and Hayashi, 1967 ), and now Korea, Daejin in approximately 38 m depth.
Remarks . This specimen generally agrees well with the original description of E. kuratai by ( Miyake and Hayashi 1967 ), which is the seventh species of the genus Eualus described from Korean waters. Further, although this species is most similar to E. middendorffi , it differs in the following characters. The mean body length (female) of E. kuratai is 30 mm compared to 41-65mm(female) for E. middendorffi . Moreover, the dorsomedian spine is absent on the fourth and fifth abdominal somites in the former, whereas it is present in the latter ( Miyake and Hayashi, 1967 ).
Genus Heptacarpus Holmes, 1900
2*Heptacarpus igarashii Hayashi and Chiba, 1989 (Figs. 3, 4)
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Heptacarpus igarashii, ovigerous female (CL 6.55 mm). A, Dorsal view; B, Lateral view. CL, length of posterior margin of the orbit to the posterior middorsal margin of the carapace.
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Heptacarpus igarashii, ovigerous female (CL 6.55 mm). A, Habitus, lateral; B, Carapace, lateral; C, Left antennule, dorsal; D, Left antennal scale, dorsal; E, Right third maxilliped, lateral; E′, Right third maxilliped, distal segment; F, Right 1st pereopod, lateral; G, Right 2nd pereopod, lateral; H, Right 3rd pereopod, lateral; I, Right 4th pereopod, lateral; J, Right 5th pereopod, lateral; K, Telson, dorsal. CL, length of posterior margin of the orbit to the posterior middorsal margin of the carapace. Scale bars: A, B=2 mm, C-K=1 mm, E′=0.5 mm.
Heptacarpus igarashii Hayashi and Chiba, 1989 : 71, figs. 1 - 3; Hayashi, 1992 : 270, figs. 226a, 227a, 228a, 229; De Grave and Fransen, 2011 : 420 (list).
Material examined. Korea: 1♀ (CL 6.55 mm), Daejin (Yeongdeok), 6 May 2012, Lee SH, at a sea cucumber farm in approximately 38 m depth.
Description. Body (Figs. 3 , 4) small size. Rostrum (Fig. 4A , B) short and spiniform, nearly straight and apically downward, reaching slightly beyond end of eye, dorsal margin with 4 teeth, including 2 teeth on rostrum proper and 2 postrostral teeth, ventral margin unarmed. Carapace (Fig. 4A , B) smooth, about 3 times as long as rostrum; suborbital margin rounded; antennal spine sharp and larger. Abdomen (Fig. 4A) smooth. Pleura of fourth and fifth somites pointed posteriorly, spine of fourth somite small. Telson (Fig. 4A , K) shorter than uropod, with 3 pairs of dorsal spines; posterior margin ending in acute tip, with 3 pairs of unequal spines. Eye (Fig. 4A) cylindrical; cornea slightly shorter than eyestalk. Antennular peduncle (Fig. 4C) reaching to midpoint of antennal scale; first segment longer than distal two segments combined, with 3 marginal spinules; second and third segments subequal, each with single, rather large marginal spine; stylocerite reaching beyond slightly distal margin of first segment. Antennal scale (Fig. 4D) long, 3.0-3.5 times as long as broad. Third maxilliped (Fig. 4A , E , E′) reaching beyond antennal scale by distal two segments; with rod-like epipod. First pereopod (Fig. 4A , F) robuster, reaching beyond antennal scale by distal half of palm; chela less than twice as long as carpus; merus shorter than chela, without subterminal spine. Second pereopod (Fig. 4A , G) slender, reaching beyond antennal scale by half of carpus, carpus dividing into 7 articles; chela small; ischium longer than merus. Third pereopod (Fig. 4A , H) reaching beyond antennal scale by dactylus or distal half of propodus; merus with single subterminal spine; propodus as long as merus, both with about 10 pairs of spinules on posterior margins; dactylus biunguiculate, with 4 spinules on posterior margin. Epipod present on first 3 pereopods. Fourth pereopod (Fig. 4A , I) falling short of end of antennal scale; merus with single subterminal spine; propodus as long as merus, both shorter than those of third pereopod. Fifth pereopod (Fig. 4A , J) reaching to end of antennular peduncle, merus with 1 small subterminal spine, shorter than that of fourth pereopod; propodus longer than merus, as long as that of fourth pereopod.
Color. Brownish body with dark brown stripes on abdomen dorsally. Tail fan dark brown (Fig. 3) .
Distribution. Japan ( Hayashi and Chiba, 1989 ), and now Daejin in approximately 38 m depth.
Remarks. This specimen fits well with the description of H. igarashii by Hayashi and Chiba (1989) . With regard to the short rostrum, this species closely resembles H. futilirostris, H. rectirostris and H. jordani from Korean waters. However, the absence of ventral teeth on the short rostrum ( H. futilirostris and H. rectirostris with 2-3 teeth and H. jordani with 1 tooth) can be easily distinguished from these three species. It is the seventh species of the Heptacarpus described from Korean waters.
Korean name: 긴뿔갯가꼬마새우(신칭)
Korean name: 대진좁은뿔꼬마새우(신칭)
Acknowledgements
This research was carried out as a part of the project “The Survey of Korean Indigenous Species” supported by National Institute of Biological Resources (NIBR) of Ministry of Environment of Korea (NIBR No. 2012-02-037).
References
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