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New Record of a Crangonid Shrimp, Aegaeon Rathbuni (Crustacea: Decapoda: Caridea) from Japan, with Notes on Its Tegumental Scales

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New Record of a Crangonid Shrimp, Aegaeon Rathbuni (Crustacea: Decapoda: Caridea) from Japan, with Notes on Its Tegumental Scales Nat. Hist. Res., Vol.6 No. 2: 67-75, March 2001 New Record of a Crangonid Shrimp, Aegaeon rathbuni (Crustacea: Decapoda: Caridea) from Japan, with Notes on Its Tegumental Scales Tomoyuki Komai Natural History Museum and Institute, Chiba 955-2 Aoba-cho, Chuo-ku, Chiba 260-8682，Japan Abstract The geographical range of a deep-water crangonid shrimp, Aegaeon rathbuni (De Man, 1918), is extended north in the Northwestern Pacific from Taiwan to Boso Peninsula, central Japan. Description and illustrations are given in order to supplement the taxanomic information of this species. Close examination has shown that A. rathbuni has minute tegum- ental scales on the body integument. This discovery represents the first certain example of the crangonid species having tegumental scales. A preliminary examination of selected species from Aegaeon and the two closely related genera, Pontocaris and Parapontocaris, has been made, and the presence of the tegumental scales is confirmed only in the congeneric A. lacazei (Gourret, 1887). Key words: Aegaeon rathbuni, Caridea, Crangonidae, new record, Japan, tegumental scales. Species of the crangonid genus Aegaeon Aegaeon, A. rathbuni and A. lacazei (Gourret, Agassiz, 1846 are burrowing shrimp of warm 1887). This finding represents the first cer- temperate and tropical waters. Chan (1996) tain example of species which have the teg- reinstated Aegaeon as a valid genus and clari- umental scales in Crangonidae. fied its status and nomenclature, assigning Materials and Methods five species formerly included in the genus Pontocaris Bate,1888. From Japanese waters, The specimens examined in this study are only one species, A. lacazei (Gourret, 1887) deposited in the collection of the Natural His- is known with certainty (Chan, 1996). Al- tory Museum and Institute, Chiba (CBM). though Hayashi (1986) reported A. rathbuni The illustrations were prepared with the aid De Man, 1918 (as Pontocaris rathbuni) from of a drawing tube mounted on a LEICA MZ8 Tosa Bay, southern Japan, as Chan (1996) stereomicroscope. The postorbital carapace indicated, Hayashi's photographed specimen length (cl) is used as a standard measurement certainly represents a species other than Aeg- indicating the size of specimen. The speci- aeon or other closely related genera. Exami- mens were stained by methylen blue for de- nation of deep-water samples from off Boso tailed observation. Peninsula, central Japan, and the East China For comparative purpose, the following Sea led to the determination that Aegaeon specimens have been examined. rathbuni is present in Japanese waters. Al- Aegaeon lacazei (Gourret, 1887). Off Ta-Shi, though the species was clearly diagnosed by I-Lan County, NE Taiwan, 100-200 m, 03. Chan (1996), morphological details of this VIII. 1996, commercial trawler, coll.T. species has not been fully described. There- Komai,1 female (cl 10.3 mm) (CBM-ZC 2766); fore, I present here detailed description and off Shionomisaki, Kii Peninsula, Japan,100 illustrations of some selected parts for better m, 20.1. 1992, dredge, coll.S. Nagai,1 female understanding of morphology of A. rathbuni. (cl 9.1 mm) (CBM-ZC 2947). The present study also shows the presence of Parapontocaris aspera Chace, 1984. Off the tegumental scales in the two species of Ta-Shi, I-Lan County, NE Taiwan, 300-400 67 T. Komai m, 04. XII. 1997，commercial trawler, coll.T. dense) and short setae; antennal spine moder- Komai,1 male (cl 14.0 mm),1 female (cl 13.5 ately strong; branchiostegal spine moderate- mm) (CBM-ZC 3883). ly strong, directed forward; pterygostomian Pontocaris pennata Bate, 1888. Tosa Bay, spine tiny; median carina armed with 5 acute Kochi, Shikoku, Japan, 33°20.79'N, teeth, third tooth smaller than or subequal in 133°36.81'E, 92-94 m, beam trawl(RV "To- size to other teeth; first lateral carina armed yohatamaru"), coll.K. Sasaki,1 female (cl11.5 with 7 acute teeth, continuous with lateral mm) (CBM-ZC 3380). rostral carina; second lateral carina with 8_ Pontocaris sibogae (De Man, 1918). Off Ka- 10 acute teeth, becoming weaker posteriorly, keroma Island, Amami Islands, Japan, 28° not continuous with antennal spine; third lat- 04.71'N, 129°27.38'E, 310 m,10. XI.1994， eral carina with 5 or 6 acute teeth in anterior sledge net (TRV "Toyoshio-maru"), coll. I. half, smooth in posterior half, continuous Takeuchi,1 female (cl 12.8 mm) (CBM-ZC with branchiostegal spine; hepatic groove 1977). rudimentary, represented by shallow depres- sion inferior to second tooth of second lateral Taxonomy carina. Abdomen (Fig.1)with 2 lateral pairs of Aegaeon rathbuni De Man, 1918 longitudinal carinae on first to fifth somites, (Figs. 1-3) in line with first and second lateral carinae Restricted synonymy. on carapace. First somite with sharp sub- Egeon orientalis: Rathbun, 1906: 911，pi.23, median carinae each terminating anteriorly fig. 3. Not Egeon orientalis Henderson, 1893. in acute submarginal spine; second and third Aegeon Rathbuni De Man, 1918: 304 (type carinae sharp, each terminating anteriorly in locality: Borneo, Indonesia); 1920: 300，pi. acute marginal spine; pleuron with broadly 24，fig. 74b, pi.25，fig. 74_74a. rounded ventral margin. Second somite with Pontocaris rathbuni: Chace,1984: 44. median carina broadened posteriorly, termi- Aegaeon rathbuni: Chan, 1996: 281，fig. 4. nating anteriorly in acute submarginal spine, Not Pontocaris rathbuni: Hayashi, 1986: 147， dorsal surface of median carina shallowly fig. 97. See "Remarks". sulcate; second carinae sharp, unarmed ante- riorly; third carina rather blunt; post- Material examined. RV "Tansei-maru": KT erodorsal margin of tergum with shallow 95-5, stn TB 14, off Taito-saki, Boso Peninsu- median notch; pleuron with broadly rounded la, 35°09.6'N, 140°49.4'E, 311—325 m, 24. IV. ventral margin. Third somite with median 1995，coll.T. Komai,1 male (cl 9.3 mm) carina slightly broadened posteriorly; first (CBM-ZC 2478). carina not very sharp, unarmed; post- RV "Yoko-maru": stn E300—5，W of Tokara erodorsal margin without distinct median Islands, East China Sea, 28°57.00'N, notch; pleuron obtusely angular at ante- 127°06.20'E, 307 m, 24. X.1997, coll.T. roventral corner. Fourth abdominal somite Kosuge,1 male (cl 7.3 mm) (CBM-ZC 5396). with median carina slightly narrowed post- TRV "Shin'yo-maru": SY99, stn 3, W of Izu eriorly; lateral surface with 3 blunt obliquely Oshima Island, Izu Islands, 34°46.39'N, longitudinal carinae, third carina joined post- 139°20.07'E, 260-251 m,15. X.1999，coll.M. eriorly with short vertical carina; post- Osawa,1 male (cl 7.8 mm) (CBM-ZC 5658). erodorsal margin with blunt median tooth; Description (males). Body slender (Fig.1). pleuron obtusely angular at anteroventral Integument of body not very firm. corner, with small, acute posteroventral Rostrum short, not reaching distal margin tooth. Fifth somite with sharp, posteriorly of cornea of eye, deeply bifurcate distally; divergent submedian carinae, each terminat- dorsal surface deeply concave with raised ing in acute marginal tooth; first and second lateral margins; lateral margin with 1 acute carinae both sharp, but unarmed; pleuron tooth. with angular ventral margin, posterolateral Carapace (Figs.1，2A, E) partially covered margin with 2 acute or blunt projections. with minute tegumental scales (partially Sixth somite 1.5 times longer than fifth —68 — New record of A. rathbuni Fig.1.Aegaeon rathbuni (De Man, 1918). Male from west of Tokara Islands, East China Sea (cl 7.3 mm; CBM-ZC 5396). Top, entire animal in lateral view; bottom, same, dorsal view. 一 69 — T. Komai somite, 2.3 times longer than anterior depth; tooth, armed with small, acute tooth arising dorsal surface with 2 sharp submedian car- from 0.7 length; dorsolateral carina sharp, inae, slightly divergent posteriorly, each ter- extending to level of dorsal tooth on sub- minating posteriorly in small acute marginal median carinae; no anteroventral ridge on 2 mm CD 0.5 mm B EF mm 0.5 mm F り^^ � 一一 Fig. 2. A—E, Aegaeon rathbuni (De Man, 1918): A—C, E, male from W of Tokara Islands, East China Sea (cl 7.3 mm; CBM-ZC 5396); D, male from off Taitosaki, Boso Peninsula (cl 9.3 mm; CBM-ZC 2478); F, Aegaeon lacazei (Gourret, 1887), female from off Shionomisaki, Kn Peninsula (cl 10.3 mm; CBM-ZC 2766). A, anterior part of carapace and cephalic appendages, dorsal, setae partially omitted; B, enclopod of first pleopod, dorsal;C, D, appendix masculina and interna of second pleopod，dorsomesial; E, F, tegumental scales on carapace. 一 70 — New record of A. rathbuni lateral face; posterolateral process acute; pos- Third maxilliped with 2 distal segments flat- teroventral corner rounded; ventral surface tened, ultimate segment with few elongate concave, with ventrolateral margins elevated spines on mesial margin; antepenultimate and bluntly ridged; preanal spine small. segment with bluntly ridged ventral surface Telson 1.4 times longer than sixth abdominal bearing 4 tiny spinules subdistally; exopod somite, gradually tapering posteriorly to well developed. acute median process, armed with 2 pairs of First pereopod (Fig. 3A, B) overreaching tiny dorsolateral spines, and 2 pairs of poste- scaphocerite by half length of palm; palm rior spines (mesial spine much longer than slightly narrowed distally, cutting edge lateral spine) and 1 pair of plumose setae on strongly oblique, showing as very thin, chiti- either side of posteromedian process; dorsal nous plate; fixed finger small, triangular; surface deeply sulcate. carpus very short, with 2 spines on lateral Thoracic sternite armed with long, for- margin; merus with very large dorsodistal wardly directed tooth on sixth somite be- spine bearing numerous long setae and addi- tween coxae of third pereopods; seventh and tional small spine on distolateral margin, lat- eighth somites each with sharp median eral face with blunt longitudinal carina, ven- carina terminating anteriorly in small tooth tral face unarmed; ischium strongly ob- between coxae of fourth and fifth pereopods liquely articulated with merus; exopod very respectively.
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