Tubuca coarctata (H. Milne Edwards, 1852 )

Jimenez, Pedro Julião, Chang, Kai, Shih, Hsi-Te & Yasuhara, Moriaki, 2024, Confirming the occurrence of two fiddler crabs, Tubuca dussumieri (H. Milne Edwards, 1852) and T. coarctata (H. Milne Edwards, 1852) (Crustacea: Decapoda: Ocypodidae), in Hong Kong by DNA barcoding and morphology, Zootaxa 5476 (1), pp. 177-191 : 182

publication ID	https://doi.org/10.11646/zootaxa.5476.1.17
publication LSID	lsid:zoobank.org:pub:B7C926C4-C2D1-4B0F-AACD-629A73FCFE42
DOI	https://doi.org/10.5281/zenodo.12682205
persistent identifier	https://treatment.plazi.org/id/038B87FA-FFAE-D90A-FF2F-E95EFB75EFD2
treatment provided by	Plazi (2024-07-07 17:54:03, last updated 2024-11-29 18:34:59)
scientific name	Tubuca coarctata (H. Milne Edwards, 1852 )
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Tubuca coarctata (H. Milne Edwards, 1852) View in CoL

( Figs. 3A, B View FIGURE 3 , 4A, B View FIGURE 4 , 5 View FIGURE 5 )

Material examined. 1 male (CW 19.5 × CL 11.9 mm), NCHUZOOL 17189, Tai Tam Bay (22.24665°N, 114.22510°E), Hong Kong, coll. P. J. Jimenez, 29 Jun. 2022 GoogleMaps .

Remarks. Tubuca coarctata is widely distributed in the West Pacific, from Indonesia (including Sumatra) to the Ryukyus and Fiji ( Crane 1975; Shih et al. 2015). The type locality is listed as “ Odessa ” (H. Milne Edwards 1852: 156), which likely to be an error as the only familiar locality by that name is the port city of Odessa in Ukraine and, as such, the actual type locality is unknown (viz. Crane 1975). The male specimen collected from Hong Kong has the following important characters: carapace strongly trapezoid in outline, anterolateral angle acute, directed anterolaterally, anterolateral margin very short, dorsolateral margin moderately long ( Fig. 5A View FIGURE 5 ); major cheliped with both outer dactylus and outer pollex with 1 groove ( Fig. 5B View FIGURE 5 ); G1 moderately long, slightly tapering distally; thumb extending beyond base of tube; pore wide, at end of a short chitinous tube, flanges absent; inner process spinous, close to tubular end of shaft ( Fig. 5C–F View FIGURE 5 ); fresh-preserved color on anterior carapace pale and dark on posterior, cheliped orange ( Figs. 3A, B View FIGURE 3 , 4A, B View FIGURE 4 ). The above characters agree with specimens of T. coarctata from Taiwan ( Shih et al. 2015) and can be confirmed as T. coarctata by morphology. The COI analysis also supports the species identity ( Fig. 7A View FIGURE 7 ; see DNA analysis). This is a new record to the fiddler crab fauna of Hong Kong.

References

Crane, J. (1975) Fiddler crabs of the world Ocypodidae: genus Uca. Princeton University Press, Princeton, New Jersey, 766 pp.

Milne Edwards, H. (1852) Observations sur les affinites zoologiques et la classification naturelle des crustaces. Annales des Sciences Naturelles, Serie 3, 18, 109 - 166.

Shih, H. - T., Chan, B. K. K., Teng, S. - J. & Wong, K. J. H. (2015) Crustacean Fauna of Taiwan: Brachyuran Crabs. Vol. II. Ocypodoidea. National Chung Hsing University, Taichung, 14 + 320 pp.

Figures

FIGURE 3. Color in life, Tai Tam Bay, Hong Kong SAR:(A, B) male Tubuca coarctata (H. Milne Edwards, 1852), NCHUZOOL 17189; (C–E) male and (F–H) female T. dussumieri (H. Milne Edwards, 1852). Specimens not collected.

FIGURE 4. Male specimen (A, B) of Tubuca coarctata (H. Milne Edwards, 1852) (19.5 × 11.9 mm; NCHUZOOL 17189); male (C, D) (21.9 × 13.5 mm; NCHUZOOL 17191) and female specimens (E, F) (21.6 × 14.2 mm; NCHUZOOL 17190) of T. dussumieri (H. Milne Edwards, 1852). (A, C, E) dorsal view; (B, D, F) ventral view. Scale bar = 10 mm.

FIGURE 5. Tubuca coarctata (H. Milne Edwards, 1852), male (19.5 × 11.9 mm), NCHUZOOL 17189, Tai Tam Bay, Hong Kong, NCHUZOOL 17189: (A) carapace; (B) major cheliped; (C) right G1 mesial view; (D) right G1 mesial view of distal part; (E) right G1 lateral view; (F) right G1 lateral view of distal part.

FIGURE 7. Genealogical network for the COI haplotypes observed within the clades of Tubuca coarctata (H. Milne Edwards, 1852) (A), and T. dussumieri (H. Milne Edwards, 1852) (B). Unlabelled hatches indicate inferred haplotypes not found in the sampled population. Gray circle indicates the haplotype found in Hong Kong. For haplotype names, see Table 1. AU:Australia; FJ: Fiji, HK: Hong Kong; ID: Indonesia; ML: Malaysia; PH: Philippines; RK: Ryukyus; TW: Taiwan.