Pyrhila, Galil, 2009

Galil, Bella S., 2009, An examination of the genus Philyra Leach, 1817 (Crustacea, Decapoda, Leucosiidae) with descriptions of seven new genera and six new species, Zoosystema 31 (2), pp. 279-320 : 305-306

Genus Pyrhila n. gen.

TYPE SPECIES. — Philyra pisum De Haan, 1841 .

ETYMOLOGY. — Pyrhila is an anagram of Philyra . Gender feminine.

DIAGNOSIS. — Carapace suborbiculate, globose; regions of carapace indistinct, save for branchio-cardiac grooves. Dorsal surface of carapace variably granulate. Frontal region slightly produced, medially grooved. Antennular fossa transversely oval, sealed by basal antennular segment. Antennae short, inserted between antennular fossa and orbit. Orbits small, rounded, upper orbital margin unisutured. Eyes retractable. Anterior margin of efferent branchial channel sinuous, projecting beyond frontal margin, separated from crenulate subhepatic margin by deep fissure. External maxilliped exopod as wide as endopod; endopodal ischium longer than subtriangular merus, bearing in female setose fringe lengthwise. Hepatic facet well defined, lower margin prominently angular. Lateral and posterior margins of carapace irregularly beaded. Epimeral margin meeting lateral margin at posterior margin, closely beaded. Chelipeds subequal, longer, stockier in adult male than in female specimens. Cheliped merus subcylindrical, slightly swollen proximally on anterior margin, surface minutely granulate, granulate. Fingers as long as propodus. Pereiopods slender, short. Pereiopodal meri longer than carpi and propodi; dactyli longer than propodi, lanceolate, terminating in cornute tips. Male abdominal sulcus deep, nearly reaching buccal cavity. First abdominal segment of male transversely narrow, medially excavate, yoke-like. Second to sixth abdominal segments fused; proximal margin with median lobe, lateral margin bearing three indistinct ridges fitting into sutures between sternal segments; lacking subterminal denticle; telson elongate, laciniate. Female abdomen with first two segments transversely narrow, medially excavate, segments three to six fused, greatly enlarged, shield-like. First male pleopod elongate, shaft wide, dorsoventrally flattened, tip setose; apical process nearly tubular, elongate. Second male pleopod short, slender, apex scoop-like.

REMARKS

Pyrhila n. gen. differs from Philyra Leach, 1817 (emend.) and Ryphila n. gen., in possessing a welldefined hepatic facet, a single transverse segment proximally on the male abdomen rather than two, and in having a tubular apical process on first male pleopod, rather than subterminally alate or filiform process. Pyrhila n. gen. shares with Lyphira n. gen., and Hiplyra n. gen. the single jointed proximal male abdominal segment, but differs from both in the shape of the apical process on first male pleopod. In addition, it differs from Lyphira n. gen. in lacking the subterminal denticle on the fused male abdominal segments, and from Hiplyra n. gen. in lacking the thick fringe of setae on the pollex.

Pyrhila biprotubera ( Dai & Guan, 1986) n. comb. ( Figs 12F ; 18 )

Philyra biprotubera Dai & Guan, 1986: 148 , figs 1-8. — Dai & Yang 1991: 90, fig. 41A. — Chen & Sun 2002: 398, fig. 179.

TYPE MATERIAL. — Holotype: China. Xiang-zhou , 22°17’N, 113°34’E, VII.1980, 1 ♂ ( GD 908314 [Guan & Dai collection]); same data, paratype 1 ♀ ( GD 908315) [deposited in the Institute of zoology, Academia Sinica].

East China Sea. 32°00’N, 127°30’E, 24.X.1959, 25 m, coll. Cheng, 1 ♂ c.l. 14.4 mm ( ZRC 1999.0013).

MATERIAL EXAMINED. — Vietnam. Cam River, intertidal, XI.1995, coll. T. Kosuge, 2 ♂♂ cl 20.5, 18.5 mm, 1 ovig. ♀ cl 13.5 mm (Chiba Institue 5841).

DISTRIBUTION. — China, Vietnam.

DESCRIPTION

Dorsal surface of carapace minutely granulate, bearing patches of small granules on branchial, gastric and intestinal regions. Hepatic, intestinal regions slightly tumescent.Branchio-cardiac grooves shallow. Front with shallow median indentation. Anterior margin of efferent channel sinuous, outer angle fissured. Upper, lower margins of subhepatic facet granulate, granules on lower margin larger. Lateral margin of carapace posteriorly to subhepatic facet closely beaded, granules smaller posteriorly.Posterior margin with dorsoventrally flattened denticles laterally in male, arcuate with prominent lateral angles in female. Epimeral surface smooth; epimeral margin minutely beaded. Outer margin of external maxilliped endopod minutely granulate, exopod distally granulate, punctate. Margins of sternal plates minutely granulate. Margin of abdominal sulcus prominently granulate anteriorly. Fused male abdominal segments 2-6 granulate basally. Fused abdominal segments in female with granulate stripe basally. Cheliped merus half as long as carapace in male; its dorsal surface minutely granulate, anterior and posterior surfaces minutely granulate. Carpus with granules on inner and upper margins.Upper and lower surfaces of propodus granulate, arcuate strip of granules medially on inner margin.Fingers fluted, granulate, granulation most prominent proximally on outer margins; inner margins denticulate. Lower margin of pereiopodal meri finely granulate, propodi dorsally and ventrally carinate, lower margin of first pereiopodal propodus in adult males boldly granulate. Male first pleopod with apical process filiform, arcuate, bent distad.

REMARKS

Dai & Guan’s (1986: 148, figs 1-8) drawings and photographs illustrate the characters that help differentiate P.biprotubera n. comb. from its congeners: the finely granulate carapace, the dorsoventrally flattened denticles on carapacial posterior margin of the male, and the slimmer, more elongate apical process of the male first pleopod.

Figures

FIG. 12. — A-D, first male pleopod,distal end of first male pleopod;A, Hiplyra sagitta n. sp., ♂ holotype cl 13.9 mm, Persian Gulf (ZMK 4263); B, Lyphira heterograna (Ortmann, 1892) n. comb., ♂ cl 15.1 mm, Indonesia (NHM 1900.10.22.340-45); C, Lyphira perplexa n. sp.,♂ cl 27.9 mm, India (USNM 337607);D, Pyrhila pisum (De Haan,1841) n. comb., ♂ cl 22.6 mm, Japan (USNM 18865);E, Pyrhila carinata (Bell, 1855) n. comb., ♂ cl 13.2 mm, China (NHM 1874.2), first male pleopod, dorsal and ventral views; F, Pyrhila biprotubera (Dai & Guan, 1986) n. comb., ♂ cl 20.5 mm, Vietnam (Chiba Inst. 5841), first male pleopod, distal end of first male pleopod, second male pleopod. Scale bars: 1 mm.

FIG. 18. — Pyrhila biprotubera (Dai & Guan, 1986) n. comb., ♂ cl 20.5 mm, Vietnam (Chiba Inst. 5841), dorsal view.