Calcinus elegans (H. Milne Edwards, 1836 )

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 : 25

Calcinus elegans (H. Milne Edwards, 1836)

( Fig. 1A )

Pagurus elegans H. Milne Edwards, 1836: 278 , pl. 13, Fig. 2 ( New Ireland , New Guinea, type locality).

Calcinus elegans – Estampador, 1937: 505; Yap-Chiongco, 1938: 206, pl. 2, Fig. 10; Estampador, 1959: 53; Haig & McLaughlin, 1984: 108; Wooster, 1984: 128–130; Haig & Ball, 1988: 159; Morgan, 1991: 274–276, Figs. 7–9 ; Gherardi & McLaughlin, 1994: 618; Poupin, 1997: 687, Figs. 2A , 3A , 4A ; Asakura, 2002: 40–43, Figs. 7–8 , Fig. 21C–D; McLaughlin et al., 2007: 155–156, unlabelled figures.

Material examined. 1 male SL 10.0 mm, 1 indiv. in shell ( ZRC), stn M1, Alona Beach, Panglao I., 9°32.9′N, 123°46.6′E, 0–1 m, v.2004 to vii.2004; 1 male SL 4.8 mm ( ZRC), stn M20, Pamilacan I., 9°29.3′N, 123º55.1′E, 0–2 m, 13.vi.2004 ; 1 male SL 5.4 mm ( ZRC), stn M58, Balicasag I., 9°31.3′N, 123°41.0′E, depth unknown, 4.vii.2004 .

Habitat. Intertidal to shallow subtidal, 0–2 m deep, on hard bottoms (coralline and rocky substrates).

Remarks. The name C. elegans previously included the Indo-West Pacific form, with bright blue bands on the pereopods, and the Hawai’ian form, with orange-red banded pereopods ( Haig & McLaughlin, 1984; Hoover, 1998). However the consistent colour differences, the geographical separation of these two colour forms, and genetic evidence all suggest that they are distinct species ( Malay & Paulay, 2010, Fig. 9 ). The Hawai’ian form should be properly named C. pictus ( Owen, 1839) based on Owen’s (1839) description and colour illustration of specimens collected in Oahu (see also Legall & Poupin, 2016).

Figures

Fig. 1. A, Calcinus elegans (H. Milne Edwards, 1836). Male SL 10.0 mm, stn M1; B, Calcinus fuscus Malay, Komai & Chan, 2012. Male SL 4.1 mm, stn B42; C, Calcinus gaimardii (H. Milne Edwards, 1848). Female SL 5.6 mm, stn R14; D, Calcinus laevimanus (Randall, 1840). Male SL 4.4 mm, stn M2; E, Calcinus latens (Randall, 1840). Male SL 3.0 mm, stn R1; F, Calcinus lineapropodus Morgan & Forest, 1991. Male SL 4.5 mm, stn R16; G, Calcinus minutus Buitendijk, 1937. Male SL 4.7 mm, stn R10; H, Calcinus morgani Rahayu & Forest, 1999. Female ovig SL 4.8 mm, stn M2.

Fig. 2. A, Calcinus pulcher Forest, 1958. Male SL 4.8 mm, stn R24; B, Clibanarius ambonensis Rahayu & Forest, 1993. Male SL 4.0 mm, stn M16; C, Clibanarius antennatus Rahayu & Forest, 1993. Male SL 3.9 mm, stn M34; D, Clibanarius corallinus (H. Milne Edwards, 1836). Male SL 3.0 mm, stn M58; E, Clibanarius cruentatus (H. Milne Edwards, 1848). Specimen not measured and sexed, Stn M2; F, Clibanarius englaucus Ball & Haig, 1972. Male SL 4.2 mm, stn M1; G, Clibanarius infraspinatus (Hilgendorf, 1869). Male SL 9.0 mm, stn S53; H, Clibanarius laevimanus Buitendijk, 1937. Specimen not measured and sexed, stn M9.

Fig. 7. Dardanus balhibuon, new species, holotype. Female SL 14.3 mm, stn R38, NMCR 40109. A, Left cheliped, outer view; B, Left cheliped, inner view; C, Right cheliped, outer view; D, Right cheliped, inner view. Scale bars = 1 mm.

Fig. 8. Dardanus balhibuon, new species, holotype. Female SL 14.3 mm, stn R38, NMCR 40109. A, Left second pereopod, lateral view; B, Propodus of left third pereopod, lateral view. Scale bars = 1 mm.

Fig. 9. Maximum likelihood phylogram based on COI mitochondrial DNA sequences. Branch support for the major clades are indicated above (= likelihood bootstrap values) and below (= Bayesian posterior probabilities) the branches. Bootstrap values <70% were not reported.

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.

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.