Spongicola robustus, Saito & Komai, 2008

Saito, Tomomi & Komai, Tomoyuki, 2008, A review of species of the genera Spongicola de Haan, 1844 and Paraspongicola de Saint Laurent & Cleva, 1981 (Crustacea, Decapoda, Stenopodidea, Spongicolidae), Zoosystema 30 (1), pp. 87-147 : 118-130

Spongicola robustus n. sp.

( Figs 20-24 )

TYPE MATERIAL. — Holotype: RV Vitiaz II, stn 2809, Mauritius, 10°29.7’S, 61°12.4’E, 115- 110 m, ovig. ♀ 5.9 mm (MNHN-Na 16315).

Paratypes: same data as holotype, 1 ♂ 7.1 mm (MNHN- Na 16316).

Mozambique, RV Vitiaz II, stn 1376, position not indicated, 1 ovig. ♀ 6.5 mm (MNHN-Na 16317). — Stn 2635,S of Mozambique, 25°05.0’S, 35°15.3’E, 230- 210 m, 1 ♂ 4.7 mm, 1 ♀ 6.0 mm (MNHN-Na 16318).

SAM 18, RV Algoa , 23°28’S, 35°43’E, 185 m, 12.VI.1994, 2 ♀♀ 6.2, 6.5 mm (MNHN-Na 16346).

ETYMOLOGY. — From the Latin robustus (robust), referring to the relatively robust body of this new species.

DISTRIBUTION. — Western Indian Ocean from Mauritius and Mozambique, 110-230 m ( Figs 36 ; 38 ; Table 6).

HOST. — Regadrella sp. ( Table 7).

DESCRIPTION OF FEMALES

Rostrum ( Fig. 21A, B ) 0.37-0.41 of carapace length, directed forward, narrow triangular in dorsal view, overreaching midlength of antennal scale; dorsal margin slightly arched, armed with 6-12 teeth, all located anterior to orbital margin; ventral margin armed with 1or 2 tiny subterminal teeth; ventrolateral ridge sharp, unarmed or armed with 1 or 2 minute teeth. Carapace ( Fig. 21A, B ) with postrostral median ridge extending to level of postrostral submedian spines; postrostral submedian spine relatively slender,straight; antennal spine relatively large, acuminate; hepatic spine relatively large;3-7 anterolateral spines relatively large, forming obliquely vertical row; anterolateral margin with 2-6 small spines; pterygostomial angle moderately produced, exceeding tip of antennal spine; branchial region smooth; cervical groove distinct.

Review of Spongicola and Paraspongicola ( Crustacea, Decapoda )

Sixth thoracic sternite ( Fig. 21C ) with moderately slender lobes separated by narrow median incision, each terminating in acute or subacute point; lateral margins sinuous, smooth. Seventh sternite with broad subtriangular lobes separated by moderately deep median notch, each anterolateral angle weakly produced, acute or subacute. Eighth sternite with triangular lobes, anterolateral angles weakly produced, terminating in acute or subacute point.

Pleon moderately depressed dorsoventrally. First somite with distinct transverse carina, its margin overhanging deeply depressed anterior section; anteroventral projection small. Second somite without distinct transverse carina, only shallow transverse groove evident. First pleuron ( Fig. 20 ) unarmed on ventral margin of posterior section; second to fifth pleura each unarmed or armed with tiny teeth or denticles on ventral margins. Sixth somite ( Fig. 21D ) widened posteriorly, lacking lateral spines; pleuron unarmed. Telson ( Fig. 21D ) about 1.5 times longer than broad; dorsal surface often with pair of proximal spines, dorsolateral carinae each bearing 3 or 4 spines; lateral margins each with shallow subproximal concavity, and armed with 1 small submarginal spine and row of 2-5 spines thereafter; posterolateral spines relatively large; posterior margin convex, with posteromedian spine. Cornea ( Fig. 21A, B ) moderately large, as wide as eyestalk, opaque; eyestalk not particularly inflated basally, armed with 3 spinules dorsally and 1 spinule mesially.Antennular peduncle ( Fig. 21A, B ) reaching distal 0.3 of antennal scale; first segment 1.7 times longer than length of distal 2 segments combined, unarmed or armed with 1 spine on distomesial margin; stylocerite acuminate, straight or slightly curved mesially; second segment with a few small spines on distolateral margin. Antennal basicerite ( Fig. 21A, B ) stout, with small dorsolateral spine and 3 or 4 additional spinules or denticles on ventrolateral margin; antennal scale subsemicircular, about 0.4 of carapace length, 1.9 times

Saito T. & Komai T.

longer than wide; lateral margin slightly concave or nearly straight, armed with 5-8 teeth including distolateral tooth, dorsal surface with 2 distinct longitudinal carinae; carpocerite moderately short, reaching to distal margin of first segment of antennular peduncle, unarmed.

Third maxilliped ( Fig. 22A ) overreaching antennal scale by length of dactylus; dactylus 0.7 of propodal length; propodus subequal in length to carpus; carpus 0.6 of meral length, ventrodistal margin distinctly produced; merus 0.8 length of ischium, unarmed; ischium with 2-12 spines on dorsolateral margin, ventral margin unarmed. Exopod rudimentary.

First pereopod ( Fig. 22B, C ) overreaching antennal scale by length of chela, with rudimentary grooming apparatus ( Fig. 22C ); chela and carpus with sparse short setae; dactylus 0.4 of chela length; carpus about 2.4 of chela length; merus 0.8 of carpal length; ischium about half of meral length. Second pereopod ( Fig. 22D ) 2.1-2.2 times longer than carapace, overreaching antennal scale by length of chela and half of carpus; chela and carpus with scattered short setae on surfaces; dactylus 0.5 of chela length; carpus 1.4 of chela length; merus 0.7 of carpal length; ischium 0.6 of meral length. Third pereopod ( Fig. 22E ) overreaching antennal scale by length of chela and carpus; chela 1.2-1.4 length of carapace; dactylus 0.4 of chela length, with row of spinules or denticles on dorsal margin; fixed finger with row of small spines or denticles extending onto palm beyond midlength and row of short setae; palm 1.3 times longer than wide, with row of acute teeth increasing in size distally on dorsal margin; lateral surface with numerous scattered granules on distal half; carpus broadened distally, 1.1 times longer than wide, 0.3 of chela length, unarmed on lateral surface; merus 0.4 of carpal length, armed with moderately small subdistal spine on dorsal margin and large subdistal spine on ventrolateral ridge, ventral margin smooth; ischium 0.6 of meral length, with moderately small dorsodistal spine. Fourth pereopod ( Fig. 22F, G ) overreaching antennal scale by half of carpus; dactylus ( Fig. 22G ) 0.2 of propodal length, relatively broad, 2.4 times longer than wide, clearly biunguiculate, ventral margin with relatively large accessory tooth at base of ventral unguis; propodus about half of carpal length; carpus longest, entire or subdivided into 2 articles, with 1 small spine at ventrodistal margin and 1 spine at distal to midlength of ventral margin; merus 0.8 of carpal length; ischium half of meral length, unarmed. Fifth pereopod similar to fourth pereopod.

Exopod of uropod ( Fig. 21D ) with 10-16 teeth on lateral margin, dorsal surface with 2 smooth longitudinal carinae; endopod with 11-13 acute teeth on lateral margin and 1 subproximal spine on middorsal carina.

Eggs counting 50, diameter 0.7-0.9 mm (holotype female) ( Table 5).

MALE CHARACTERISTICS

Rostrum ( Fig. 23 ) 0.51 of carapace length. Sixth thoracic sternite ( Fig. 24A ) with slender, acuminate lobes clearly separated by deep U-shaped median notch, each lateral margin with 1 or 2 spinules or denticles. Seventh sternite with moderately broad, subtriangular lobes, each terminating in acute tip, each lateral margin denticulate. Eighth sternite with triangular lobes, smaller than those on seventh sternite, each tip acute, lateral margin minutely denticulate. First pleonal somite ( Fig. 23 ) with prominent ventral projection supported by short, but distinct ridge, terminating in subacute point. Second to sixth pleonal somites ( Fig. 23 ) with pleura unarmed or armed with small teeth or denticles on margins. Second pereopod ( Fig. 24B ) 2.4-2.6 times longer than carapace. Chela of third pereopod ( Fig. 24C ) 1.5-1.6 of carapace length; palm with more numerous spinules or granules on distal part of lateral surface than in females.

REMARKS

Spongicola robustus n. sp. is very similar to S. venustus . Shared characteristics include: the dorsal margin of the rostrum is slightly arched; the grooming apparatus of the first pereopod is rudimentary; the second pereopod is covered with numerous short setae; and the merus of the third pereopod is armed with a large subdistal spine on the ventrolateral margin. The two species can be distinguished by minor morphological traits. The dorsal rostral series is restricted to the rostrum proper in S. robustus n. sp. In contrast, in S. venustus , one or two teeth are present on the carapace posterior to the level of the orbital margin. The second segment of the antennular peduncle is armed with two small teeth in S. robustus n. sp., rather than being unarmed in S. venustus . The second pereopod is proportionally longer in S. robustus n. sp. than in S. venustus (2.1- 2.2 times longer than the carapace versus 1.2-2.1 in females, and 2.4-2.6 versus 1.5-2.2 in males). The spination of the carapace and third pereopod are much stronger in S. robustus n. sp. than in S. venustus . Furthermore, the cornea is opaque in S. robustus n. sp., whereas darkly pigmented in S. venustus .

Spongicola venustus de Haan, 1844 ( Figs 25-29 )

Spongicola venusta de Haan, 1844 : pl. 46 fig. 9; 194, pl. P. — Herklots 1861: 148. — Miers 1878: 507, pl. 24 figs 1, 2. — Bate 1888: 213, figs 41, 42, pl. 29. — Ortmann 1890: 539. — Thallwitz 1892: 50. — Stebbing 1893: 212. — Caullery 1896: 382. — Ijima 1901: 87, 201, 215. — Thompson 1901: 18. — Doflein 1902: 642. — Bouvier 1905: 983; 1908a: 889; 1908b: 151. — A. Milne-Edwards & Bouvier 1909: 264. — Kemp 1910: 409. — Balss 1914: 74. — Parisi 1919: 92. — Arndt 1933: 251. — Yokoya 1933: 44. — Estampador 1937: 497. — Holthuis 1946: 62, pl. 3j. — Fujino & Miyake 1970: 302.— Holthuis & Sakai 1970:294. — Kim 1977: 322, fig. 144; pl. 56, fig. 70. — de Saint Laurent & Cleva 1981: 169, figs 1, 8a-h. — Miyake 1982:19, pl.7. — Takeda 1982: 38. — Tung et al. 1988: 21, fig. 19. — Yamaguchi & Baba 1993: 213, fig. 35. — Saito & Takeda 2003: 120.

Spongicola venustus Holthuis 1993: 310 , fig. 305.

TYPE MATERIAL. — Lectotype (designated by Yamaguchi & Baba 1993): Japan, 1823-1834, coll. Ph. F. von Siebold and H. Bürger, ♂ (RMNH D 1132). Not examined.

Paralectotypes: same data as lectotype, 1 ♀ (RMNH D 1132) ; 6 specs (RMNH D 2921). Not examined.

MATERIAL EXAMINED. — Japan. Off Kominato, Boso Peninsula, 2 ♂♂ 6.3, 9.0 mm, 1 ♀ 8.3 mm (TUMT). — Sagami Bay , 8 ♂♂ 4.3-7.9 mm, 4 ♀♀ 2.7-8.0 mm, 7 specs (not measured) (ZUMT). — Off Sunosaki , 150-200 m, 13.VII.1894, 1 ♂ 7.9 mm, 1 ♀ 8.0 mm (ZUMT). — Off Kii, II.1973, 1 ♂ 10.5 mm (NSMT-Cr 4859) ; 1 ♀ 10.4 mm (NSMT-Cr 4860). — Off Minabe, Kii Peninsula, III.1944, 4 ♂♂ 6.7-9.6 mm, 2 ♀♀ 7.3, 8.6 mm (SMBL, Ordinary Specimen Macrura-18). — Tosa Bay , 1.II.1988, 8 ♂♂ 6.7-8.8 mm (NSMT-Cr 10072), 5 ♀♀ 7.1-8.8 mm (NSMT-Cr 10959). — 12 miles NE of Okino-shima Island, Genkai-nada Sea , 113 m, 15.VII.2004, 1 ♂ 8.5 mm, 1 ♀ 6.5 mm, 6 ovig. ♀♀ 5.7-8.0 mm (PNPA). — Off Ushibuka, Amakuksanada, western Kyushu , depth not recorded, 17.III.1989, coll. M. Osawa, 1 ♂ 6.9 mm, 1 ♀ 6.8 mm (CBM-ZC 977). — Off Amakusa, Kumamoto Prefecture, III.1988, 1 ♀ 7.3 mm (NSMT-Cr 12157). — Okinawa Island, Ryukyu Islands , 10.IX.1986, 1 ♂ 8.8 mm, 1 ovig. ♀ 8.4 mm (PNPA) .

Philippines. MUSORSTOM 1, stn 4, 14°01.8’N, 120°17.2’E, 182-194 m, 19.III.1976, 1 ovig. ♀ 8.3 mm (MNHN-Na 2917). — Stn 15, 200- 191 m, 1 ovig. ♀ 9.3 mm (MNHN-Na 2918). — Stn 32, 14°02.2’N, 120°17.7’E, 193- 184 m, 23.III.1976, 1 ovig. ♀ 8.0 mm (MNHN-Na 2919). — Stn 41, 25.XI.1980, 6 ♀♀ 6.9- 7.8 mm, 4 ♂♂ 7.4-9.0 mm (MNHN-Na 3891). — Stn 51, 13°49.4’N, 120°04.2’E, 200- 170 m, 25.III.1976,

Review of Spongicola and Paraspongicola ( Crustacea, Decapoda )

1 ♂ 8.3 mm (MNHN-Na 2921).

MUSORSTOM 3, stn 98, W of Luzon, 14°00.2’N, 120°17.9’E, 180-190 m, 1.VI.1985, 1 ♂ 7.6 mm, 1 ovig. ♀ 7.8 mm (MNHN-Na 16319). — Stn 103, W of Luzon, 14°00.4’N, 120°18.15’E, 178-185 m, 1.VI.1985, 1 ♀ 3.0 mm, 1 ♂ 1.7 mm (MNHN-Na 16320). — Stn 108, W of Luzon, 14°01.1’N, 120°17.9’E, 181- 174 m, 2.VI.1985, 2 ♂♂ 7.5, 7.7 mm, 1 ovig. ♀ 7.5 mm (MNHN-Na 16321). — Stn 116, SW of Mindoro, 12°32.2’N, 120°46.4’E, 804-812 m, 3.VI.1985, 2 ♂♂ 7.0, 10.6 mm (MNHN-Na 16322). — Stn 124, between Mindoro and Panay, 12°02.6’N, 121°35.5’E, 114- 111 m, 4.VI.1985, 1 ♂ 6.7 mm (MNHN-Na 16323).

Sarawak. RV Vitiaz II, stn 6482, W coast of Sarawak, 04°31.2’N, 112°55.7’E, 88- 85 m, 1 ♂ 9.1 mm, 1 ovig. ♀ 7.8 mm (MNHN-Na 16347).

DISTRIBUTION. — Japan, Philippines and Sarawak, 60-482 m ( Figs 36 ; 38 ; Table 6).

HOSTS. — Associated with several species of hexactinellid sponges such as Euplectella aspergillum , E. curvistellata , E. imperialis , E. marshalli , E. oweni and Hyalonema sieboldi ( Table 7).

DESCRIPTION OF FEMALES

Rostrum ( Fig. 26A, B ) 0.25-0.39 of carapace length, directed forward, reaching midlength of antennal scale at most; dorsal margin slightly arched in lateral view, armed with 8-12 teeth, including 1 or 2 teeth posterior to orbital margin; ventral margin unarmed or armed with 1 subterminal tooth; ventrolateral ridge sharp, unarmed or armed with 1 or 2 very small teeth. Carapace ( Fig. 26A, B ) with postrostral median ridge extending to level of postrostral submedian spines; postrostral submedian spine relatively small, directed forward; antennal spine moderately small, acuminate; single hepatic spine relatively large; 3-5 anterolateral spines moderately small,

Saito T. & Komai T.

forming oblique row; anterolateral margin with row of spinules; pterygostomial angle produced, distinctly overreaching antennal spine; branchial region smooth; cervical groove distinct.

Sixth thoracic sternite ( Fig. 26C ) with small lobes separated by very narrow median notch, each tip weakly bifid, lateral margins smooth. Seventh sternite with rectangular lobes separated by narrow V-shaped median notch, each anterolateral angle rounded or subacute, distomesial angle rounded; lateral margin smooth or weakly serrated. Eighth sternite with subtriangular lobes, each anterolateral angle weakly produced, rounded or angular.

Pleon moderately depressed dorsoventrally. First somite with distinct transverse carina, its margin overhanging deeply depressed anterior section; anteroventral projection small. Second somite without distinct transverse carina, only shallow transverse groove evident. First pleuron ( Fig. 25 ) unarmed on posteroventral margin; second to fifth pleura unarmed on lateral surfaces and margins. Sixth somite ( Fig. 26D ) widened posteriorly, lacking lateral spines; pleural margin smooth. Telson ( Fig. 26D ) about 1.6 times longer than broad; dorsal surface often with pair of small proximal spines, dorsolateral carinae each with 2-4 spines; lateral margins each with shallow subproximal concavity, and armed with a small submarginal spine and row of 2-6 spines thereafter; posterolateral spines present; posterior margin convex, with posteromedian spine.

Cornea ( Fig. 26A, B ) well developed, moderately large, as broad as eyestalk, darkly pigmented; eyestalk not markedly inflated basally, unarmed or armed with 1-4 spinules dorsally and 1 or 2 spinules mesially.Antennular peduncle ( Fig. 26A, B ) overreaching midlength of antennal scale; first segment about 2.6-2.8 length of second segment; stylocerite subacute, straight; second segment unarmed on distolateral margin. Antennal basicerite ( Fig. 26A, B ) stout, with small distolateral spine and a few additional small spines on ventrolateral margin; antennal scale subsemicircular, about 1.8 times longer than wide; lateral margin slightly concave to nearly straight, armed with 5-7 teeth including distolateral tooth, dorsal surface with 2 distinct longitudinal carinae; carpocerite short, reaching midlength of first antennular peduncle, unarmed.

Third maxilliped ( Fig. 27A ) overreaching antennal scale by length of dactylus; dactylus 0.8 of propodal length; propodus 0.8 of carpal length; carpus 0.7 of meral length; merus 0.8 length of ischium, unarmed; ischium armed with 2-7 small spines on dorsolateral margin, ventral margin unarmed. Exopod rudimentary.

First pereopod ( Fig. 27B, C ) overreaching antennal scale by length of chela, with rudimentary grooming apparatus ( Fig. 27C ); dactylus 0.4 of chela length; carpus longest, twice of chela length; merus 0.7 of carpal length; ischium 0.7 of meral length. Second pereopod ( Fig. 27D ) 1.2- 2.1 times longer than carapace, setose, reaching antennal scale by half of carpus; dactylus half of chela length; carpus longest, 1.2 of chela length; merus 0.8 of carpal length; ischium 0.7 of meral length. Third pereopod ( Fig. 27E ) overreaching antennal scale by length of chela and carpus; chela 1.2-1.5 length of carapace; dactylus 0.4 of chela length, with row of small spines or tubercles and moderately long setae on dorsal margin; fixed finger with row of small denticles or tubercles on ventral margin, extending onto midlength of palm; palm broad, about 1.4 times as long as deep, dorsal margin with row of small spines over entire length, decreasing in size proximally, and rows of moderately long setae; lateral surface of palm with numerous scattered granules on distal half, extending to basal half of fixed finger, and with short to moderately long setae dorsally; carpus broadened distally, 1.1 times longer than wide, 0.3 of chela length, unarmed on lateral surface; merus 0.6 of carpal length, usually armed with 1 small subdistal spine on dorsal margin and 1 large subdistal spine on ventrolateral margin, and unarmed on ventromesial margin; ischium 0.6 of meral length, with small dorsodistal spine. Fourth pereopod ( Fig. 27F, G ) overreaching antennal scale by half of carpus; dactylus ( Fig. 27G ) 0.3 length of propodus, moderately broad, 2.3 times longer than wide, clearly biunguiculate, bearing tiny accessory tooth on ventral margin at base of ventral unguis; propodus 0.4 of carpal length; carpus longest, sometimes subdivided into 2 articles, unarmed or armed with 1 small movable spine at ventrodistal margin and 1 small spine at midlength of ventral margin; merus 0.8 of carpal length; ischium 0.6 of meral length, unarmed.

Exopod of uropod ( Fig. 26D ) with 12-16 teeth on lateral margin, dorsal surface with 2 smooth longitudinal carinae; endopod with 11-13 teeth on lateral margin and sometimes with 1 subproximal spine on middorsal carina.

Eggs counting 240, diameter 0.9-1.1 mm (1 example, PNPA) ( Table 5).

MALE CHARACTERISTICS

Rostrum ( Fig.28 )0.25-0.46 of carapace length.Sixth thoracic sternite ( Fig. 29A ) with slender, acuminate lobes clearly separated by deep U-shaped median notch, each terminating in bilobed tip, each lateral margin unarmed or armed with a few spinules or denticles. Seventh sternite with moderately broad, trapezoid lobes, each terminating in acute tip, each lateral margin minutely denticulate. Eighth sternite with triangular lobes, smaller than those on seventh sternite, each tip acute, lateral margin minutely denticulate. First pleonal somite ( Fig. 28 ) with prominent ventral projection supported by short, but distinct ridge, terminating in subacute point. Pleura of second to sixth pleonal somites ( Fig. 28 ) unarmed or armed with marginal teeth or denticles. Second pereopod ( Fig. 29B ) 1.5-2.2 times longer than carapace. Chela of third pereopod ( Fig. 29C ) 1.3-1.6 length of carapace.

REMARKS The present material slightly extends the geographical range of S. venustus to south ( Sarawak) and the bathymetric range up to 60 m and down to 482 m.

Figures

FIG. 20. — Spongicola robustus n. sp., holotype ovig. ♀ 5.9 mm, off Mauritius (RV Vitiaz II, stn 2809) (MNHN-Na 16315), entire animal in lateral view. Scale bar: 1 mm.

FIG. 21. — Spongicola robustus n. sp.,holotype ovig.♀ 5.9 mm,off Mauritius (RV Vitiaz II, stn 2809) (MNHN-Na 16315):A, anterior part of carapace and cephalic appendages, lateral view (setae omitted); B, same, dorsal view (right eye and antennae omitted); C, thoracic prominences on sixth to eighth somites, ventral view; D, sixth pleonal somite, telson and left uropods, dorsal view (right uropod and marginal setae omitted). Scale bar: 1 mm.

FIG. 22. — Spongicola robustus n. sp., holotype ovig. ♀ 5.9 mm, off Mauritius (RV Vitiaz II, stn 2809) (MNNHN-Na 16315), left thoracic appendages: A, third maxilliped, lateral view; B, first pereopod, lateral view; C, same, chela and carpus, ventral view; D, second pereopod, lateral view;E, third pereopod,lateral view;F, fourth pereopod, lateral view; G, same,dactylus and distal part of propodus, lateral view. Scale bars: A, B, D-F, 1 mm; C, G, 0.5 mm.

FIG. 23. — Spongicola robustus n. sp., paratype ♂ 7.1 mm, off Mauritius (RV Vitiaz II, stn 2809) (MNHN-Na 16316), entire animal in lateral view. Scale bar: 1 mm.

FIG. 24. — Spongicola robustus n. sp., paratype ♂ 7.1 mm, off Mauritius (RV Vitiaz II, stn 2809) (MNHN-Na 16316): A, thoracic prominences on sixth to eighth somites, ventral view;B, left second pereopod, lateral view; C, left third pereopod, lateral view. Scale bar: 0.5 mm.

FIG. 36. — Bathymetric ranges of species of the genera Spongicola de Haan, 1844 and Paraspongicola de Saint Laurent & Cleva, 1981.

FIG. 38. — Geographic ranges of Spongicola levigatus Hayashi & Ogawa, 1987 (△), S. robustus n. sp. (▲) and S. venustus de Haan, 1844 (○).

FIG. 25. — Spongicola venustus de Haan, 1844, ♀ 8.0 mm, off Sunosaki, Sagami Sea, Japan (ZUMT), entire animal in lateral view. Scale bar: 1 mm.

FIG. 26. — Spongicola venustus de Haan, 1844, ♀ 8.0 mm, off Sunosaki, Sagami Sea, Japan (ZUMT): A, anterior part of carapace and cephalic appendages, lateral view; B, same, dorsal view (right eye and antennae omitted); C, thoracic prominences on sixth to eighth somites, ventral view; D, sixth pleonal somite, telson and left uropods, dorsal view (right uropod and marginal setae omitted). Scale bar: 1 mm.

FIG. 27.— Spongicola venustus de Haan,1844, ♀ 8.0 mm,off Sunosaki,Sagami Sea,Japan (ZUMT),left thoracic appendages:A, third maxilliped, lateral view; B, first pereopod, lateral view; C, same, chela and carpus, ventral view; D, second pereopod, lateral view; E, third pereopod, lateral view; F, fourth pereopod, lateral view; G, same, dactylus and distal part of propodus, lateral view. Scale bars: A, B, D-F, 1 mm; C, G, 0.5 mm.

FIG. 28. — Spongicola venustus de Haan, 1844, ♂ 7.9 mm, off Sunosaki, SagamiSea, Japan (ZUMT), entire animal in lateral view. Scale bar: 1 mm.

FIG. 29.— Spongicola venustus de Haan,1844, ♂ 7.9 mm,off Sunosaki,Sagami Sea,Japan (ZUMT):A, thoracic prominences on sixth to eighth somites, ventral view; B, right second pereopod, lateral view; C, right third pereopod, lateral view. Scale bars: 1 mm.