Uroptychus longior Baba, 2005

Baba, Keiji, 2018, Chirostylidae of the Western and Central Pacific: Uroptychus and a new genus (Crustacea: Decapoda: Anomura), Tropical Deep-Sea Benthos (Mémoires du Muséum national d'Histoire naturelle 212), pp. 1-612 : 279-283

Uroptychus longior Baba, 2005

Figures 129 , 130

Uroptychus longior Baba, 2005: 43 , fig. 14.

TYPE MATERIAL — Holotype: Indonesia, Bali Sea , 7°29’S, 114°49’E, 240 m, male ( ZMUC CRU-11075 ). [not examined].

MATERIAL EXAMINED — Philippines. MUSORSTOM 2 Stn CP15, 13°55’N, 120°29’E, 326-330 m, 21.XI.980, 1 ov. ♀ 5.3 mm (MNHN- IU-2014-16655) . Indonesia, Kai Islands. KARUBAR Stn CP05, 5°49’S, 132°18’E, 296-299 m, 22.X.1991, 1 ov. ♀ 6.4 mm (MNHN-IU-2014-16656) . – Stn CP16, 05°17’S, 132°50’E, 315-349 m, 24.X.1991, 1 ♀ 5.8 mm (MNHN-IU-2014-16657) , 1 ov. ♀ 6.9 mm, 1 ♀ 7.2 mm (MNHN-IU-2014-16658) , 1 ♀ 3.1 mm (MNHN-IU-2014-16659) . Tanimbar Islands. KARUBAR Stn CP45, 7°54’S, 132°47’E, 302-305 m, 29.X.1991, with coral Primnoidae (Calcaxonia) , 1 ♂ 6.2 mm (MNHN-IU-2014-16660) . Solomon Islands. SALOMON 1 Stn DW1788, 9°19.4’S, 160°15.4’E, 341-343 m, 30.IX.2001, 1 ♂ 4.7 mm (MNHN-IU-2014-16661) . – Stn DW1826, 9°56.4’S, 161°04.0’E, 418-432 m, 4.X.2001, 1 ♀ 4.3 mm (MNHN-IU-2014-16662) . New Caledonia, Wallis and Futuna Islands. MUSORSTOM 7 Stn DW537, 12°30’S, 176°41’W, 325-400 m, with corals of Primnoidae (Calcaxonia) , 16.V.1992, 1 ♂ 4.9 mm (MNHN-IU-2014-16663) . Vanuatu. MUSORSTOM 8 Stn DW1068, 16°16’S, 167°20’E, 536-619 m, 2.X.1994, 1 ♂ 4.6 mm (MNHN-IU-2014-16664) . New Caledonia, Chesterfield Islands. MUSORSTOM 5 Stn DW355, 19°36’S, 158°43’E, 580 m, 18.X.1986, 1 ♀ 4.1 mm (MNHN-IU-2014-16665) . New Caledonia. MUSORSTOM 4 Stn CP194, 18°52’S, 163°21’E, 550 m, 19.IX.1985, 1 ov. ♀ 6.1 mm (MNHN-IU-2014-16666) . BATHUS 4 Stn CP930, 18°31.36’S, 163°23.63’E, 530-520 m, 7.VIII.1994, 1 ♂ 4.8 mm (MNHN-IU-2014-16667) . BATHUS 2 CP766, 22°10’S, 166°01’E, 650-724 m, 17.V.1993, 1 ♂ 6.0 mm (MNHN-IU-2014-16668) . New Caledonia, Norfolk Ridge. BIOCAL Stn DW36, 23°09’S, 167°11’E, 650-680 m, 29.VIII.1985, 1 ♀ 4.7 mm (MNHN-IU-2014-16669) . CHALCAL 2 Stn CC01,24°55’ S, 168°22’E,500-580 m, 28.X.1986, 1 ♂ 4.8 mm (MNHN-IU-2014-16670) . – Stn DW72,24°54.5’S, 168°22.3’E, 527 m, 28.X.1986, 1 ♀ 3.9 mm (MNHN-IU-2014-16671) . – Stn DW73, 24°39.9’S, 168°38.1’E, 573 m, on coral Primnoidae (Calcaxonia) , 29.X.1986, 1 ♂ 4.4 mm, 2 ov. ♀ 5.4, 5.5 mm (MNHN-IU-2014-16672) . – Stn DW74, 24°40.36’S, 168°38.38’E, 650 m, 29.X.1986, 2 ♂ 2.9, 4.9 mm, 3 ov. ♀ 4.8-5.8 mm, 1 ♀ 5.2 mm (MNHN-IU-2014-16673) . – Stn DW75,24°39.31’S,168°39.67’E, 600 m, 29.X.1986, 1 ov.♀ 4.8 mm (MNHN-IU-2014-16674) . NORFOLK 1 Stn DW1666, 23°42’S, 167°44’E, 469-860 m, 20.VI.2001, 1 ov. ♀ 4.4 mm (MNHN-IU-2014-16675) . – Stn DW1694, 24°40’S, 168°39’E, 575-589 m, 24.VI.2001, 1 ♂ 5.5 mm (MNHN-IU-2014-16676) . – Stn DW1697, 24°39’S, 168°38’E, 569-616 m, 24.VI.2001, 2 ♂ 6.2, 6.4 mm (MNHN- IU-2014-16677) . – Stn DW1700, 24°40’S, 168°39’E, 605-752 m, 24.VI.2001, 1 ♂ 5.5 mm, 1 ov. ♀ 6.4 mm, 1 ♀ 3.6 mm (MNHN-IU-2014-16678) . – Stn DW1707, 23°43’S, 168°16’E, 381-493 m, 25.VI.2001, 1 ov. ♀ 6.1 mm (MNHN-IU-2014-16679) . NORFOLK 2 Stn DW2027, 23°26.34’S, 167°51.38’E, 465-650 m, 21.X.2003, 2 ov. ♀ 5.7, 6.2 mm (MNHN-IU-2014-16680) . – Stn DW2049, 23°42.88’ S, 168°15.43’E, 470-621 m, 24.X.2003, 1 ♂ 4.7 mm (MNHN-IU-2014-16681) . – Stn DW2056, 24°40.32’S, 168°39.17’E, 573-600 m, 25.X.2003, 1 ov. ♀ 4.0 mm (MNHN-IU-2014-16682) . – Stn DW2057, 24°40’S,168°39’E, 555-565 m, 25.X.2003, 1 ♂ 4.7 mm, 3 ♀ 3.4-4.3 mm (MNHN-IU-2014-16683) . – Stn DW2058,24°39.76’S, 168°40.43’E,591-1032 m, 25.X.2003, 2 ♂ 3.0, 5.1 mm, 1 ov. ♀ 4.1 mm (MNHN-IU-2014-16684) . – Stn DW2060, 24°39.84’S, 168°38.50’E, 582-600 m, 25.X.2003, 1 ov. ♀ 5.3 mm (MNHN-IU-2014-16685) . – Stn CP2061, 24°39.50’S, 168°40.32’E, 620-1040 m, 25.X.2003, 1 ♂ 5.5 mm, 1 ov. ♀ 4.1 mm (MNHN-IU-2014-16686) . – Stn CP2062, 24°40.05’S, 168°39.70’E, 560-572 m, 25.X.2003, 1 ♂ 5.7 mm (MNHN-IU-2014-16687) . – Stn DW2064, 25°17’S, 168°56’E, 609-691 m, 26.X.2003,1 ♂ 5.3 mm, 2 ov. ♀ 4.1-4.9 mm (MNHN-IU-2014-16688) . – Stn DW2075,25°23.12’S,168°20.07’E,650-1000 m, 27.X.2003,6 ♂ 4.2-5.8 mm, 6 ov. ♀ 5.3-5.8 mm, 1 ♀ 5.7 mm (MNHN-IU-2014-16689) . – Stn DW2077, 25°20.63’S, 168°18.53’E, 666-1000 m, 27.X.2003, 1 ♂ 3.8 mm (MNHN- IU-2014-16690) . – Stn CP2088, 24°57’S, 168°22’E, 627-1089 m, 28.X.2003, 2 ♂ 5.7,5.8 mm, 2 ov. ♀ 5.7, 6.0 mm, 1 ♀ 4.4 mm (MNHN-IU-2014-16691) . – Stn CP2089,24°44’S,168°09’E,227-230 m, 29.X.2003,4 ♂ 3.7-5.3 mm, 2 ov.♀ 5.1,5.9 mm,2 ♀ 4.8,6.2 mm (MNHN-IU-2014-16692) . – Stn DW2112, 23°44.44’S, 168°18.40’E, 640-1434 m, 31.X.2003, 1 ♂ 3.7 mm, 1 ov. ♀ 6.5 mm (MNHN-IU-2014-16693) . – Stn CP2122, 23°21.55’S, 168°00.12’E, 560- 577 m, 1.XI.2003, 1 ♂ 5.5 mm, 1 ov. ♀ 5.6 mm (MNHN-IU-2014-16694) . BERYX 11 Stn DW10, 24°52.85’S,168°21.40’E, 560-600 m, 15.X.1992, 2 ♂ 5.7, 6.2 mm, 3 ov. ♀ 4.6-6.8 mm, 1 ♀ 4.7 mm (MNHN-IU-2014-16695) . Tonga. BORDAU 2 Stn DW1617, 23°03’S, 175°53’W, 483-531 m, 17.VI.2000, 1 ♀ 4.4 mm (MNHN-IU-2014-16696) .

DISTRIBUTION„ Kai Islands and Bali Sea, and now Philippines (between Lubang Islands and Luzon), Solomon Islands, Wallis-Futuna Islands, Vanuatu, Chesterfield Islands, New Caledonia, Norfolk Ridge, and Tonga; 227-1434 m.

SIZE„ Males, 2.9-6.4 mm; females, 3.1-6.9 mm; ovigerous females from 4.0 mm. DESCRIPTION„ Medium-sized species. Carapace: Slightly broader than long (0.9 × as long as broad); greatest breadth 1.5 × distance between anterolateral spines. Dorsal surface nearly smooth, somewhat convex from anterior to posterior without any depression. Lateral margins somewhat divergent posteriorly, with 8 spines: first anterolateral, reaching or slightly overreaching smaller lateral orbital spine; second and third usually small, third occasionally obsolete, and both distinctly ventral to level of other spines; fourth to eighth well developed, acute, placed along branchial margin, rarely followed by additional small spine; another small spine consistently dorsomesial to fourth spine. Rostrum narrow triangular, with interior angle of 23-24° (rarely 17°); dorsal surface flattish or slightly concave, ventral surface straight horizontal; lateral margin with usually 3-5, occasionally 0-2 distal spinules; length 0.5-0.7 × that of remaining carapace, breadth slightly less than half carapace breadth at posterior carapace margin. Pterygostomian flap anteriorly angular, produced to sharp spine, surface with tiny denticle-like spines.

Sternum: Excavated sternum subtriangular between bases of Mxp1, ending in blunt tip, surface with somewhat ridged in midline. Sternal plastron about as long as broad, lateral extremities between sternites 4 and 7 somewhat divergent posteriorly. Sternite 3 shallowly depressed, anterior margin with semi-oval median sinus flanked by incurved spine on each side. Sternite 4 with smooth, nearly straight anterolateral margin anteriorly produced to pronounced spine directed anterolaterally, reaching at most base of submedian spines on sternite 3; posterolateral margin relatively long, slightly shorter than anterolateral margin. Anterolateral margin of sternite 5 slightly shorter than posterolateral margin of sternite 4.

Abdomen: Smooth and glabrous. Somite 1 with distinct transverse ridge. Somite 2 tergite 2.3-2.7 × broader than long; pleuron anterolaterally and posterolaterally blunt angular, lateral margin well concave. Pleuron of somite 3 laterally angular. Telson slightly less than half as long as broad; posterior plate moderately emarginate on posterior margin, length 1.2-1.4 × that of anterior plate.

Eye: 1.7-1.9 × longer than broad, usually overreaching, rarely terminating in midlength of rostrum; slightly broader distally. Cornea more than half as long as remaining eyestalk.

Antennule and antenna: Ultimate article of antennular peduncle 3.2-4.0 × longer than high. Antennal article 2 with strong lateral spine. Antennal scale about twice as broad as article 5, tapering, overreaching peduncle by more than half length of article 5, not reaching rostral tip, occasionally bearing 1 or 2 small spines on lateral proximal margin. Distal 2 articles each with strong distomesial spine; article 5 1.5-1.8 × longer than article 4, breadth 0.6-0.7 × height of ultimate antennular article. Flagellum consisting of 11-15 segments, not reaching distal end of P1 merus.

Mxp: Mxp1 with bases broadly separated. Mxp3 having lateral surface barely or sparsely setose. Basis with a few denticles on mesial ridge, distal one usually distinct, rarely obsolescent, others usually tiny or obsolescent. Ischium with 20-26 (rarely 30) denticles on crista dentata; flexor margin distally rounded. Merus 1.6 × as long as ischium, bearing distolateral spine and a few small spines on distal half of cristate flexor margin; mesial face flattish. Carpus with distinct distolateral spine often accompanying small spine, with or without another small proximal spine on extensor surface.

P1: 4.6-5.8 × longer than carapace, relatively slender, sparingly with soft setae, more setose on fingers. Ischium dorsally with strong spine, ventromesially with well-developed subterminal spine. Merus 1.1-1.4 × (females), 1.4 × (males) longer than carapace, with 4 rows of spines: 2 dorsal rows of distinct, often small spines, 1 dorsomesial row (distal spine and one about at midlength usually strong, and few other smaller), 1 ventral row (1 strong distal spine and 2 well-developed, occasionally small ventral spines in line with ventromesial subterminal spine of ischium). Carpus 1.2-1.4 × longer than merus, somewhat granulose, with distomesial and distolateral spines of small-size ventrally, and other small spines in 2 rows dorsally (1 in midline, another near mesial margin); all of these occasionally obsolescent. Palm 2.9-3.1 × (males), 2.8- 4.9 × (females) longer than broad, 0.8-1.1 × length of carpus. Fingers fitting to each other in distal part when closed, not distinctly incurved, gaping in large males, occasionally slightly gaping in large females; movable finger about half length of palm, opposable margin with basally broad subtriangular or narrow process about at midlength in large males, low process at proximal third in females and small males; opposable face of fixed finger with proximal longitudinal groove to accommodate opposite process on movable finger when closed.

P2-4: Relatively slender and well compressed mesio-laterally; sparsely with soft setae. Meri successively shorter posteriorly (P3 merus 0.8-0.9 × length of P2 merus, P4 merus 0.9 × length of P3 merus), equally broad on P2-4; length-breadth ratio, 3.8-4.3 on P2, 3.4-3.8 on P3, 3.2-3.7 on P4; P2 merus 0.9 × length of carapace, 1.0-1.2 × length of P2 propodus; P3 merus 0.9 × length of P3 propodus; P4 merus 0.8-0.9 × length of P4 propodus; dorsal margin with row of spines; ventrolateral margin with well-developed terminal spine, rarely accompanying small spine proximal to it, ventromesial margin with terminal spine often obsolescent or absent in small specimens. Carpi subequal, shorter than dactyli, less than half length of propodi (carpus-propodus length ratio, 0.37-0.40 on P2, 0.33-0.36 on P3, 0.32-0.35 on P4), extensor margin with row of spines occasionally obsolescent on P4 (bearing distal spine only), distalmost spine accompanying additional spine lateral to it on P2. Propodi shorter on P2 than on P3 and P4; extensor margin usually unarmed; flexor margin ending in pair of spines preceded by 2 or 3 (rarely 4) spines on P2, 1 or 2 (rarely 4 or 5) on P3 and P4. Dactyli 0.5-0.6 × length of propodi and longer than carpi (dactylus-carpus length ratio, 1.1-1.4 × on P2, 1.2-1.4 on P3, 1.1-1.5 on P4); flexor margin nearly straight, bearing 12-14 spines, ultimate slender, penultimate about twice as broad as ultimate but not much longer than remainder, remaining spines also slender, obliquely directed, nearly contiguous to one another, antepenultimate slightly broader than ultimate.

Eggs. Number of eggs carried, 6- 30 eggs (normal number probably more); size, 0.86 × 0.94 mm - 1.10 mm × 1.20 mm.

PARASITES — Non-ovigerous female (MNHN-IU-2014-16689) with externa of rhizocephalan parasite attached to antennular article 2.

REMARKS — The male specimen taken at NORFOLK 1 Stn DW1694 (MNHN-IU-2014-16676) has three small proximal spines on the extensor margin of P2 propodus but no other differences were found. The species is very similar to U. alophus n. sp. (see above for their relationships). It is also close to Uroptychus nanophyes McArdle, 1901 . Their relationships were discussed in my earlier paper ( Baba, 2005).

Figures

FIGURE 129 Uroptychuslongior Baba,2005,A-C,E-H,ovigerous female 4.8 mm (MNHN-IU-2014-16674);D, female 6.3 mm (MNHN-IU-2014-16692). A, carapace and anterior part of abdomen, proximal part of right P1 included, dorsal. B, same, lateral. C, anterior part of sternal plastron,with excavated sternum and proximal parts of Mxps,ventral.D,telson.E, right antenna,ventral.F, left Mxp3,lateral.G, right P1, proximal part, ventral.H, same, proximal articles omitted, dorsal.Scale bars: A-F,1 mm; G, H, 5 mm.

FIGURE 130 Uroptychus longior Baba,2005,ovigerous female 4.8 mm (MNHN-IU-2014-16674).A, proximal parts of right P2-4,ventral.B, left P2,lateral.C, same, distal part,setae omitted, lateral. D, left P3, setae omitted, lateral. E, left P4, setae omitted, lateral.Scale bars: 1 mm.