Tubuca dussumieri (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 : 182-184

Tubuca dussumieri (H. Milne Edwards, 1852)

( Figs. 3C–H , 4C–F , 6 )

Material examined. 1 male (21.9 × 13.5 mm), NCHUZOOL 17191, 1 male (19.2 × 12.2 mm), NCHUZOOL 17192, 1 female (21.6 × 14.2 mm), NCHUZOOL 17190, Tai Tam Bay (22.24665°N, 114.22510°E), Hong Kong, coll. P. J. Jimenez, 29 Jun. 2022 .

Remarks. Tubuca dussumieri is widely distributed in the eastern margin of the Indian Ocean and the West Pacific, from West Thailand to the Ryukyus and Solomon Islands ( Crane 1975; Shih et al. 2015, 2022), with the type locality being Samarang, central Java, Indonesia (H. Milne Edwards 1852; Crane 1975). The male and female specimens collected from Hong Kong have the following important characters: carapace trapezoidal in outline, anterolateral angle subacute, directed anterolaterally, anterolateral margin short, dorsolateral margin long ( Fig. 6A ); major cheliped with outer dactylus with 2 long grooves, outer pollex with 1 long groove ( Fig. 6B ); minor fingers with a large tooth in female ( Fig. 4E, F ); G1 moderately slender, distal tip bluntly rounded; pore small, anterior flange complete and large, slightly projecting, posterior one small; inner process broad and flat, tip slightly bent inward ( Fig. 6C–F ); fresh color on anterior carapace pale and dark on posterior in adult, 3 white patches on dark carapace in female, cheliped orange ( Figs. 3C–H , 4C–F ). The above characters agree with specimens of T. dussumieri from Taiwan ( Shih et al. 2015) and confirm the identify as T. dussumieri based on morphology. The COI analysis also supports the species identity ( Fig. 7B ; see DNA analysis).

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 6. Tubuca dussumieri (H. Milne Edwards, 1852), male (21.9 × 13.5 mm), Tai Tam Bay, Hong Kong, NCHUZOOL 17191: (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.