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Zootaxa 2337: 47-62 (2010)

Uca jocelynae  sp. nov., a new species of fiddler crab (Crustacea: Brachyura: Ocypodidae) from the Western Pacific

Hsi-Te Shih, Tohru Naruse & Peter K. L. Ng

A new species of fiddler crab, Uca jocelynae sp. nov., belonging to the U. vocans complex, is described from the islands in Western Pacific on the basis of morphological and molecular data. The new species was previously identified with U. neocultrimana (Bott, 1973) (= U. vocans pacificensis Crane, 1975). The two species can be readily distinguished by characters of the male major chelae, carapace features, and the form of the vulvae. The molecular data of parts of the mitochondrial 16S rRNA and cytochrome oxidase I (COI) genes support that both are sister taxa but nevertheless distinct enough to be regarded as separate species. Uca jocelynae is widely distributed from the islands in the Western Pacific, while U. neocultrimana occurs in Fiji and eastwards.

Key words: Uca jocelynae, U. neocultrimana, U. vocans complex, Western Pacific islands, 16S rRNA, cytochrome oxidase I, taxonomy.

Figure 1. Collection sites for species of the Uca vocans complex used in our study: red circles (nos. 1V9) for U. jocelynae sp. nov.; blue triangles (nos. 10V11) for U. neocultrimana; green squares (nos. 12V18) for other species (Table 1). Gray circles and triangle (with nos. 19V28) mean the additional records of U. jocelynae and U. neocultrimana, respectively, from other references (Bott 1973; Crane 1975; Barnwell 1982; Minemizu 2000): 19, Kume I. in the Ryukyus; 20, Sulu in Philippines; 21, Zamboanga in Philippines; 22, Davao in Philippines; 23, Halmahera in Sulawesi; 24, Ambon in Indonesia; 25, Palau; 26, Madang in New Guinea; 27, Marshall; 28, Samoa. Different lines indicate the updated range of the two species.

Figure 2. Uca jocelynae sp. nov. A-D, holotype (NMNS-6177-001). A, habitus, dorsal view; B, ventral view; C, major chela; D, frontal view; E, F, major chelae with live coloration.

Figure 3. Uca jocelynae sp. nov. and U. neocultrimana (Bott, 1973). A, B, DVF, holotype of U. jocelynae (NMNS-6177-001); C, U. jocelynae (RUMF-ZC-1076); GVI, holotype of U. neocultrimana. A, left third maxilliped; B, abdomen and telson; C, right vulva; D, G, right G1, lateral view; E, H; distal part of right G1, lateral view; F, I; distal part of right G1, mesial view. Scales = 1 mm.

Figure 4. Uca jocelynae sp. nov. Variation of the live coloration. AVE, adult males; F, adult female; G, H, young males.

Figure 5. A, B, habitus and major chela of the holotypes of Mesuca (Latuca) neocultrimana Bott, 1973 (SMF-5654); C, D, habitus and major chela of the holotypes of Uca (Thalassuca) vocans pacificensis Crane, 1973 (USNM 137670); E, F, major chelae of Uca vocans (Linnaeus, 1758); G, H, major chelae of Uca borealis Crane, 1975.

Figure 6. A neighbor-joining (NJ) tree of species of the Uca vocans complex from the Indo-West Pacific and outgroups, based on 1193 bp of the combined 16S rRNA and COI genes. Probability values at the nodes represent support values for NJ, maximum parsimony (MP) and Bayesian inference (BI). **, *, holotype and paratype of U. jocelynae sp. nov., respectively. For haplotype names, see Table 1.

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Jocelyn Crane (1909-1998) (courtesy of D. Griffin and C. Boyko)

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