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A N E W Alpheid Shrimp of the Genus Betaeus N ・O M T H E

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A N E W Alpheid Shrimp of the Genus Betaeus N ・O M T H E CRUSTACEAN RESEARCH，NO 29 ，45-57 ，2000 A new alpheid shrimp of the genus Betaeus n ・omthe Pacific coast of central Japan (Crustacea: Decapoda: Caridea) Keiichi Nomura and Tomoyuki Komai Abstrαct.-A new alpheid shrimp， tative of Betaeus from Japanese waters. Betaeus gelasinifer，is described and il ・ The specimens examined in this study lustrated from the Pacific coast of cen- are deposited in the Hayama Siosai Mu- tral Honshu，Japan. The new species is seum，Kanagawa (HSM)，Museum Na- characterized by aset of the following tional d'Histoire Naturelle，Pari s characters: the frontal margin of the (MNHN)，National Fisheries University， carapace is moderately indented; the Shimonoseki (NFU)，Natural History Mu- palm of the first pereiopod is relatively seum and Institute，Chiba (CBM)， deep and usually bears ashallow excava- Nationaal Natuurhistorisch Museum， tion on the ventral surface; the lateral Leiden (RMNH)，and Sabiura Marine surface of the palm of the first pereiopod Park Research Station，Kushimoto lacks granules，tubercles or setae; the (SMP). The abbreviation CLis used for mesial spine at the posterolateral corner carapace length，as measured from the of the telson is noticeably elongate; and anterior margin to the midpoint of the the endopod of the uropod overreaches posterior margin of the carapace. the posterior margin of the telson by 0.3 of its length. It represents asecond spe- Taxonomy cies of the genus from Japanese waters. A briefnote on the taxonomy ofthe genus is Betαeus gelasinifer new species provided. Figs.1-5 Introduction New Japanese name:Ekubo-teppouebimodoki Most ofthe 14 recognized species ofthe genus Betαeus are distributed in temper- Betαeus sp.:Nomura et al. ，1998 :43 ，Fig. 1K. ate waters in the Indian and Pacific Oceans (Table 3) ，though the alpheids are Material examined.-Holotype. generally inhabitants of subtropical or RMNH D 48600，O (CL 6 .3 mm)， tropical regions.Furthermore ，species in Kominato，Boso Peninsula，intertidal ，24 the genus are known to be free living or June 1994，coll .K. Nomura. associated with other invertebrates such Paratypes.MNHN-Na 13605，1o (C L as abalone，sea urchins，and porcelain 4.8 mm)，20vig .<j> <j> (CL4.5 ，5.2 mm)，Bay crab (Jensen，1995 ). In this paper，we de- mouth of the Hamana Lake，Shizuoka scribe anew species，Bet αeus gelαsinifer， Prefecture，intertidal ，3 December 1994， based on samples collected from Hamana coll. M .It oh; CBM-ZC 5209，2 o o ( CL5 .7， Lake，Miura and Boso P eninsula，central 6.8mm) ，1 <j> (CL4.7 mm)，2 ovig. <j> <j> (CL Japan，during acontinuous survey ofthe 4.6，7. 1mm )，Hasama ，Tateyama ，Boso decapod crustacean fauna of the area. Peninsula，intertidal ，16 May 1996，coll. This new species is the second represen- T. Komai;NFU530 -2 -2132，1 ovig. <j> (CL 46 K. NOMURA &T .KOMAI 5.8 mm)，Hasama ，Tateyama ，Boso Penin- Antennular peduncle (Figs. 2A-C) sula，intertidal ，18 May 1996，col l. K. relatively robust，about half of carapace Nomura; RMNHD 48601，2 00 (CL 5.5， length，overreaching distal margin of 7.1mm) ，4ovig. <.i? <.i? (CL 5.3-7.1 mm)， blade of antennal scaphocerite.Stylo- Kominato，Boso Peninsula，intertidal ，10 cerite reaching 0.6-0.9 length of second May 1997，coll. K. Nomura; HSM-Crm- segment，terminating in acute spine; first 0078，male (CL 5.6mm) ，Hayama ，Miura segment with strong subdistal tooth on Peninsula，intertidal ，25 June 1997，col l. ventromesial margin，laterodistal margin K. Hagiwara. produced in triaugular process; second Other material. SMP・1671，2ovig. <.i? <.i? segment 1. 7-2.4 times as long as distal (CL 5.8 ，6.8mm) ，Banda ，Tateyama ，Boso width and 1. 2-1. 6times as long as visible Peninsula，intertidal ，25 May 1998，coll . part of first segment; third segment K. Tsuchiya. subequal to visible part of first segment. Description.-Moderately large al- Lateral flagellum (Fig.1A) shorter than pheid shrimp.Body (Figs .1A ，5) robust. carapace，branches fused for 10-14 ar- Rostrum absent (Fig. 2A). Carapace (Figs. ticles ，shorter ，aesthetascs ・bearing 1A，2A ，2B) with 企ontal margin exceeding branch composed of 2-4 articles; mesial anterolateral margin，moderately in- flagellum subequal to carapace length. dented medially; dorsal surface with scat- Antenna (Figs .2A ，B ，D) with basi- tered very short setae;orbital hood well cerite bearing strong ventrolateral tooth， developed，unarmed anteriorly; antero- slightly overreaching distal margin of lateral margin unarmed; pterygostomian first segment of antennular peduncle， angle broadly rounded; cardiac notch dis- anterodorsal margin produced in small tinct. blunt process. Scaphocerite 2.7-3.2times Abdomen (Fig.1A) rounded dorsally， as long as wide; lateral margin nearly four anterior somites with pleura broadly straight; distolateral tooth strong，dis- rounded，that of fifth somite rectangular tinctly overreaching distal margin of posteroventrally; dorsal surface of each rounded blade. Carpocerite subcylindri- somite with sparse very short setae. Sixth cal ，4.0-4.5 times as long as wide，over- somite 0.2-0.3times as long as carapace， reaching distal end of antennular pe- with articulated triangular posteroven- duncle.Flagellum (Fig. 1A) distinctly tral flap; posterolateral process blunt. longer than carapace，stout ，somewhat Telson (Fig. 2J) 0.4 times as long as cara- flattened. pace，1. 7-1. 9times as long as anterior Mandible (Fig.1B) with 2・segmented width; dorsal surface with sparse，very palp，distal segment rounded，with nu- short setae and 2pairs of moderately merous long setae marginally; incisor pro- strong spines，anterior pair arising 仕om cess with 5blunt teeth; molar process midlength; lateral margins nearly paral- with 4clusters of dense short setae on lel in anterior half，slightly convergent in mesial face. Maxillule (Fig.1C) with bi- posterior half; posterior margin strongly lobed palp，lateral lobe narrower than convex，with numerous long setae and 2 mesiallobe，bearing 5long setae，mesial pairs of spines at each posterolateral cor- lobe bearing 1long apical bristle; distal ner，mesial spines much longer than lat- endite subovate，with double row of small eral spines，and exceeding posterior mar- spines and stiff setae on mesial margin; gin of telson . proximal endite slender，with cluster of Eyes (Figs. 2A，B) covered by anterior spiniform setae distally.Maxilla (Fig. lD) part of carapace in dorsal and lateral with short palp; distal endite bilobed， views，fully exposed in anterior view; ocu・ with row of long setae marginally; proxi- lar peduncle with small dorsal spine. mal endite composed of single smalllobe; NEWBETAEUS SPECIES FROM JAPAN 47 A A 5mm BC 1mm Fig.1. Betαe u s gehszruhr new species:A，paratype male (CBM-ZC5209，CL6.8mm)，lateral view;B-G，paratype male (RMNH D48601a，CL7.1mm)，right mouthparts:B，mandible;C， maxUlule; i::i， marlIl a; E ，first maxilliped; F，second maxilliped; G ，third maxilliped scaphognathite with anterior lobe nar- proximal endite narrow，with sparse se- rowed distally-First maxilliped (Fig.1E)tae on mesial margin;exopod with n 田 TOW with long，slender palp，overreaching dis- caridean lobe，flagellum long，with nu- tal margin of distal endue;distal endite merous plumose setae distally;epipod with slightly concave mesial margin;large，slightly bilobed.Second maxilliped 48 K 目 NOMURA& T .KOMAI C D d. B ABEFGH 2mm CDIJ 1mm F J H Fig. 2. Betα，eus gelαsinifernew species，holotpe male (RMNH D48600 ，CL 5 .9mm ): A ，anterior part of carapace and cephalic appendages，dorsal; B ，same ，lateral ;C ，antennule ，ventral; D ， antenna，dorsal; E ，right first cheliped，lateral ;F ，same ，chela ，dorsal ;G ，same ，merus and is- chium，mesial; H ，left first cheliped，lateral; 1，uropodal exopod，dorsal ，setae omitted; J，telson and right uropods，dorsal ，setae omitted. (Fig. lF) with dactyl narrow，with dense slightly falling short of or reaching distal setae on mesial margin; exopod long，with margin of antennular pedunde:ultimate numerous plumose setae distally; epipod segment 5.6times as long as deep，taper- suboval. Third maxilliped (Fig.lG) stout， ing distally，with numerous transverse NEWBETAEUS SPECIES FROMJAPAN 49 rows of serrulate stiff setae on dorsal and finger broadly based，terminating in mesial faces ，distal margin with tuft of acute or subacute tip ，crossing with tip of long stiff setae and 0-3 short spines; dactylus; dorsal surface with scattered penultimate segment about half length of short or long setae; lateral face with scat- ultimate segment，with long setae on dis- tered setae and row of numerous tufts of tal margin; antepenultimate segment 1. 5 short to long setae adjacent to cutting times as long as ultimate segment，be- edge; cutting edge in males usually armed coming flat proximally，with sharply with very large tooth just proximal to edged ventromesial margin; basis short， midlength and deep notch just proximal separated 企omantepenultimate segment to large tooth; cutting edge in females and with distinct suture; coxa with promi- part of male with row of low subacute or nent，hooked process arising 企omantero・ blunt teeth insterspersed by thin ridges. lateral angle; exopod well developed，dis- Carpus short，cup-shaped ，with minute tinctly overreaching distal margin of an- setae on surfaces. Merus 1. 5-2.0 times tepenultimate segment; epipod with ter- longer than greatest depth，triangular in minal hook. cross section; dorsal margin bluntly First pereiopods (Fig. lA) usually ridged，produced distally in blunt or sub- equal or subequal，not carried flexed in acute process; lateral face without setae， both sexes.Chelae (Figs .2E-H ，4A- D) ventrodistal angle forming broadly considerably variable in shape and arma- rounded process，ventrolateral margin ture of cutting edges of fingers; 0.7-1. 1 sinuous with strong tubercle proximally; times as long as carapace，1. 9-2.3times mesial face without setae，ventr ，odistal longer than greatest depth; strongly com- angle slightly produced，ventromesial pressed lateral1 y，血 verted，thus dactyl on margin with row of small tubercles and ventral side .Dactylus 0.7-1.
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