Dardanus pedunculatus (Herbst, 1804)

Malay, Maria Celia (Machel) D., Rahayu, Dwi Listyo & Chan, Tin-Yam, 2018, Hermit crabs of the genera Calcinus Dana, Clibanarius Dana, and Dardanus Paul’son from the PANGLAO 2004 Expedition, with description of a new species and a checklist of the hermit crabs of the Philippines (Crustacea: Anomura: Paguroidea), Raffles Bulletin of Zoology 66, pp. 23-65 : 51

Dardanus pedunculatus (Herbst, 1804)

( Fig. 4D )

Cancer pedunculatus Herbst 1804: 25 , pl. 61, Fig. 3 (type locality unknown).

Pagurus asper – Estampador, 1937: 502; Yap-Chiongco, 1938: 197; Estampador, 1959: 50.

Pagurus haani – Fize & Serène, 1955: 207–214, Figs. 32–33 A–B, pl. 4 no. 7.

Dardanus pedunculatus – Haig & Ball, 1988: 166; Cassidy, 2005: 114–116, Figs. 15–16; McLaughlin et al., 2007: 83–84, 2 unlabelled figures.

Material examined. 1 male SL 16.8 mm ( ZRC), stn N2, Alona Reef, Panglao I., 9°32.9′N, 123°46.6′E, 12 m, 7.vi.2004 ; 2 females SL 8.4–11.0 mm, 4 males SL 5.7–13.4 mm ( ZRC), stn N3, Alona Reef, Panglao I., 9°32.9′N, 123°46.6′E, 25–30 m, 7.vi.2004 ; 3 females SL 10.2–15.2 mm, 4 males SL 8.3–14.0 mm ( ZRC), stn N5, Alona Reef, Panglao I., 9°32.9′N, 123°46.9′E, 20–35 m, 10.vi.2004 ; 1 ovig. female SL 15.6 mm, 1 female SL 12.9 mm ( ZRC), stn N8, Tawala, Panglao I., 9°32.8′N, 123°46.6′E, 32–55 m, 14.vi.2004 ; 1 ovig. female SL 13.0 mm, 2 males SL 6.5–12.0 mm ( ZRC), stn N10, Tawala, Panglao I., 9°33.0′N, 123°46.8′E, 35–60 m, 21.vi.2004 ; 1 female SL 13.1 mm ( ZRC), stn N12, lagoon off Poblacion, Panglao I., 9°34.2′N, 123°43.2′E, 1–2 m, 24.vi.2004 ; 1 male SL 2.7 mm ( ZRC), stn R5, Catarman, Panglao I., 9°36.6′N, 123°52.4′E, 5–16 m, 31.v.2004 ; 1 female SL 9.2 mm ( ZRC), stn R13, Doljo Point, Panglao I., 9°35.6′N, 123°43.2′E, 2–41 m, 2.vi.2004 ; 1 male SL 15.4 mm ( ZRC), stn R31, Pamilacan I. southsouthwest slope, 9°29.4′N, 123°56.0′E, 10–41 m, 8.vi.2004 ; 1 male 11.5 mm ( ZRC), stn R37, Momo Beach, Panglao I., 9°36.5′N, 123°45.6′E, 28−32 m, 10.vi.2004 ; 1 ovig. female SL 19.0 mm ( ZRC), Balicasag I., vii.2003 .

Habitat. Subtidal, 2 to 60 m deep, reef slopes, on coralline substrates; associated with anemones.

Remarks. At first glance, D. pedunculatus resembles D. deformis , and D. gemmatus in that all 3 species are associated with anemones and have similar white- and redbanded ocular peduncles. Dardanus pedunculatus can be distinguished from D. gemmatus on the basis of the outer surface of the left cheliped: in D. pedunculatus the lower half of the left chela is smooth, while in D. gemmatus the entire outer surface of the left chela is covered with tubercles. The lateral surface of the left cheliped of D. pedunculatus and D. deformis resemble each other more closely, but the two species differ in the morphology of the left third pereopod: the dactyl and propodus of the left third pereopod in D. deformis are considerably broader than the right third pereopod (pereopods are more symmetrical in D. pedunculatus ); and in D. pedunculatus the lateral face of the dactyl shows a strong carina in the proximal half, which is absent in D. deformis .

Figures

Fig. 4. A, Dardanus sanguinolentus (Quoy & Gaimard, 1824). Female ovig. SL 6.3 mm, stn R6; B, Dardanus balhibuon, n. sp. Holotype female SL 14.3 mm, stn R38, NMCR 40109, preserved colouration; C, Dardanus megistos (Herbst, 1804). Male SL 11.0 mm, stn M8; D, Dardanus pedunculatus (Herbst, 1804). Male SL 13.4 mm, stn N3; E, Dardanus scutellatus. Male SL 9.8 mm, stn D12; F, Dardanus woodmasoni (Alcock, 1905). Male SL 5.8 mm, stn R76.

Fig. 3. A, Clibanarius longitarsus (De Haan, 1849). Specimen not measured and sexed, stn M52; B, Clibanarius merguiensis De Man, 1888. Male SL 3.5 mm, stn M51; C, Clibanarius serenei Rahayu & Forest, 1993. Male SL 3.6 mm, stn M11; D, Clibanarius snelliusi Buitendijk, 1937. Male SL 5.3 mm, stn M1; E, Clibanarius striolatus Dana, 1852. Specimen not measured and sexed, stn M9; F, Clibanarius virescens (Krauss, 1843). Male SL 4.1 mm, stn M8; G, Dardanus deformis (H. Milne Edwards, 1836). Female SL 8.8 mm, stn M3; H, Dardanus lagopodes (Forskål, 1775). Female SL 6.6 mm, stn M8.