Coleusia urania (Herbst, 1801)

Ng, Peter K. L., Türkay, Michael & Galil, Bella S., 2014, On the identity of Cancer urania Herbst, 1801 (Crustacea: Decapoda: Brachyura: Leucosiidae), Zootaxa 3786 (2), pp. 124-134 : 126-132

publication ID	https://doi.org/ 10.11646/zootaxa.3786.2.2
publication LSID	lsid:zoobank.org:pub:C115FB41-5A9C-4A2B-B58E-DCB5A92F85FF
DOI	https://doi.org/10.5281/zenodo.6135122
persistent identifier	https://treatment.plazi.org/id/03EA9979-CA4C-FFEF-62E3-B40EFD83FECE
treatment provided by	Plazi
scientific name	Coleusia urania (Herbst, 1801)
status

Treatment

Coleusia urania (Herbst, 1801) View in CoL

( Figs. 1 View FIGURE 1 , 2 View FIGURE 2 , 4–6 View FIGURE 4 View FIGURE 5 View FIGURE 6 )

Cancer urania Herbst, 1801: 17 , pl. 53, fig. 3.

Leucosia urania View in CoL — Lichtenstein 1816: 140.— Leach 1817: 21.— Desmarest 1825: 167.— White 1847: 48 (part).— Gibbes 1850: 185.— Bell 1855a: 362.— Bell 1855b: 283.— Bell 1855c: 5.— Serène 1968: 47. Leucosia anatum View in CoL – K. Sakai 1999: 19, pl. 7F (not Cancer anatum Herbst, 1783 ).

Leucosia grandis – Chen & Sun 2002: 422, fig. 190, pl. 16.5, 6 [name not available, see above].

Coleusia urania View in CoL — Galil 2006: 64, figs. 2E, F, 3E, 4D.—Ng et al. 2008: 94.

Not Leucosia urania View in CoL — Bianconi 1867: 341.— Hilgendorf 1869: 110.—De Man 1881: 256 [= Coleusia signata View in CoL (Paul’son, 1875)]

Not Leucosides urania — Rathbun 1910: 309, pl. 1, fig. 1.— Suvatti 1950: 143. [= Soceulia brunnea Miers, 1877 View in CoL ].

Not Leucosia urania View in CoL — Hilgendorf 1879: 811 [= Coleusia rangita Galil, 2006 View in CoL ].

Not Leucosia urania View in CoL — Naiyanetr 1998: 58.— Naiyanetr 2007: 69 [= Soceulia brunnea Miers, 1877 View in CoL ].

Not Leucosia urania View in CoL — Alcock 1896: 220 [= Coleusia View in CoL new species, Promdam et al., 2014].

Material examined. China. Guangdong Province, Haimen, 07– 15.05.1957, coll. Z. Fan, paratype of Leucosia grandis Chen & Türkay , 1 ♂ (42.6 × 38.7 mm) ( SMF 25700); Guangdong Province, Shan Wei, 22°46.60’N 115°20.60’E, donated H.L. Chen, IOCAS, 1 ♂ (38.7 × 34.8 mm) ( ZRC 2013.1295). Taiwan. Su-Ao, Nangfangao, 0 5.11.2000, coll. P.K.L. Ng, 2 ♂ (40.9 × 36.8 mm, 40.3 × 36.5 mm) ( ZRC 2001.0045); Su-Ao, Nangfangao, 23.03.1999, coll. M.-S. Hung, 1 ♂ (35.7 × 40.1 mm) ( ZRC 2014.0175); Tahsi, 0 6.04.1986, coll. J.-F. Huang, 1 ♂ (35.8 × 39.4 mm) ( ZRC 2014.0174).

Description. Carapace ( Figs. 1 View FIGURE 1 , 2 View FIGURE 2 B, 4A) subpentagonal, globose, 1.1 times as long as wide; dorsal surface glabrous, smooth, sparsely punctate; regions indistinct. Frontal region produced, upcurved, deeply concave medially, laterally constricted; frontal margin rounded. Anterolateral margin sinuous, with obsolescent granules distally ( Figs. 2 View FIGURE 2 B, 4A). Lateral angle of carapace rounded, overhanging thoracic sinus, margin prominently beaded, granules lozenge-shaped. Posterolateral margins rounded, smooth ( Figs. 2 View FIGURE 2 B, 4A). Epimeral margin invisible in dorsal view, gutter-like anteriorly, narrowing posteriorly, closely beaded marginal granules decreasing in size posteriorly, meeting posterior margin at an angle. Posterior margin minutely granular, sinuous in male ( Fig. 4 View FIGURE 4 A), slightly rounded in female ( Fig. 2 View FIGURE 2 B); deflexed posterior surface smooth.

Antennule obliquely folded into fossa, fossa sealed by basal antennular segment. Antennae short, inserted between antennular fossa, orbit. Orbits small, rounded, outer orbital margin with single suture, anterior margin of efferent branchial channel forms part of lower orbital margin. Eyes retractable. External maxillipeds completely concealing trapezoid buccal opening, smooth; endopod merus triangular, as long as ischium; in female, endopod with setose fringe lengthwise, ischium medially elevated, keel-like ( Fig. 4 View FIGURE 4 F).

Thoracic sinus deep, tomentose, anterior margin level with base of coxopodite of third maxillipeds, anteriorly defined by overhanging beaded margin of pterygostomian region; ventral margin medially with row of oval granules, decreasing in size posteriorly ( Figs. 2 View FIGURE 2 E, 4B). Thoracic sternites smooth, shiny; sternites 1–3 completely fused, trapezoidal, separated from sternite 4 by sinuous suture; sternites 4–8 with medially interrupted sutures between them ( Fig. 4 View FIGURE 4 F); distinct peg-like abdominal locking mechanism on sternite 5, adjacent to sternite 4 in male. Abdominal cavity nearly reaching buccal cavity, lateral margins prominently ridged medially, ridge fitting into notch between somites 5, 6 ( Fig. 4 View FIGURE 4 F). Male abdomen smooth; somite 1 narrow, transverse; somite 2 small, narrow, spindle-shaped; somites 3–6 fused, proximally inflated, furrowed lengthwise, suture between somites 5, 6 distinct but somites immovable; somite 6 elongated, lateral margins evenly curved, narrowing distally, with prominent triangular denticle subproximally; telson triangular, lateral margins gently convex, as wide as long ( Fig. 4 View FIGURE 4 F). Female abdomen with somites 3–6 fused, greatly enlarged, shield-like, telson triangular ( Fig. 2 View FIGURE 2 C).

G1 elongated, shaft stout, sinuous, tightly coiled 3 times on its axis, ultimate coil swollen, setose; apical process cornute, beak-like, curved interiorly ( Figs. 5 View FIGURE 5 , 6 View FIGURE 6 ). G2 relatively short, slender, apex scoop-like ( Fig. 6 View FIGURE 6 D, E).

Chelipeds subequal, robust, relatively longer in adult male ( Fig. 4 View FIGURE 4 A) than in females ( Fig. 2 View FIGURE 2 B). Merus trigonal; anterior, posterior margins lined along their length with perliform granules, diminishing in size distally; upper surface with coalesced cluster of granules proximally, followed by 4 large perliform granules, distally smooth; lower surface pitted, proximally granular, laterally with rows of small granules ( Figs. 2 View FIGURE 2 F, 4C). Carpus inflated, smooth ( Figs. 2 View FIGURE 2 B, 4A). Propodus lenticular, slightly longer than wide, upper margin rounded, smooth; lower margin with row of granules, lower external surface with small, rounded granules ( Figs. 2 View FIGURE 2 B, 4A, D). Fingers as long as propodus, gaping, cutting edges, finely teethed ( Fig. 4 View FIGURE 4 A).

Ambulatory legs similar in shape, gradually decreasing in length from first to fourth ( Figs. 1 View FIGURE 1 , 2 View FIGURE 2 B, 4A). Coxal condyles rounded. Meri subcylindrical; first 3 meri with anterior parts bearing 2 granular rows on respective dorsal margin, posterior parts distally obsolescent, 2 granular rows on ventral margins, anterior parts proximally obsolescent; merus of last leg with single granular row dorsally, prominently granular crest subproximally on ventral margin ( Fig. 4 View FIGURE 4 E). Carpi rounded, minute denticle on upper surface ( Fig. 4 View FIGURE 4 E). Propodi dorsally, ventrally carinate, expanded, foliaceous ( Fig. 4 View FIGURE 4 A, E). Dactyli longer than propodi, lanceolate, subspatuliform ( Fig. 4 View FIGURE 4 E).

Colour. Dorsal surface of carapace yellowish orange to white, paler laterally and posteriorly; a broad whitish stripe proceeding backwards from the front; two large spots on the posterior part of the carapace, and two smaller ones on each lateral margin, the basal portion of the fingers, and a ring on each segment of the ambulatory legs, are all rust coloured ( Fig. 1 View FIGURE 1 ). Ventral surface paler grey.

Remarks. Coleusia urania (Herbst, 1801) differs from its congeners— C. biannulata ( Tyndale-Biscoe & George, 1962) , C. magna ( Tyndale-Biscoe & George, 1962) , C. rangita Galil, 2006 , C. signata (Paulson, 1875) — in having a prominently granular rather than smooth fourth ambulatory merus ( Fig. 4 View FIGURE 4 E); an expanded, distinctly foliaceous ambulatory propodus ( Figs. 2 View FIGURE 2 B, C, 4A, E); the interiorly curved beak-like apical process of the G1 ( Figs. 5 View FIGURE 5 , 6 View FIGURE 6 A–C); and in its distinctive color pattern ( Fig. 1 View FIGURE 1 ). The record of “ Leucosia urania ” from the Andaman Sea by Alcock (1896: 220) must be referred to a new species of Coleusia ( Promdam et al. 2014) . The same is true for some specimens identified as " Leucosia grandis " by Chen & Sun (2002: 422) from the Gulf of Thailand and Singapore. This new species is superficially similar to C. urania but differs in the form of the chelipeds and most significantly, in a different G1 structure. The records from the Gulf of Thailand by Rathbun (1910: 309, as Leucosides urania ) and Naiyanetr (1998: 58; 2007: 69, as Leucosia urania ) are misidentifications of Soceulia brunnea (Miers, 1877) ( Galil 2006: 64) .

Distribution. China and Taiwan.

SMF	Forschungsinstitut und Natur-Museum Senckenberg
IOCAS	Institute of Oceanology, Chinese Academy of Scineces
ZRC	Zoological Reference Collection, National University of Singapore

Copyright notice

No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.

Taxonomy

Kingdom	Animalia
Phylum	Arthropoda
Class	Malacostraca
Order	Decapoda
InfraOrder	Brachyura
Family	Leucosiidae
Genus	Coleusia