Calcinus anani Poupin & McLaughlin, 1998

Poupin, Joseph & Lemaitre, Rafael, 2003, Hermit crabs of the genus Calcinus Dana, 1851 (Decapoda: Anomura: Diogenidae) from the Austral Islands, French Polynesia, with description of a new species, Zootaxa 391, pp. 1-20 : 8-13

Calcinus anani Poupin & McLaughlin, 1998

Calcinus anani Poupin & McLaughlin, 1998: 10 , figs. 1, 2 (type locality: Tuamotu, Moruroa atoll, French Polynesia); Asakura & Tachikawa, 2000: 267 ( Japan); Asakura & Nomura, 2001: 101 ( Japan); Kato & Okuno, 2001: 69, unnumbered colour photograph ( Japan); Asakura, 2002: 29, figs. 2, 3, 21A ( Japan). Calcinus pulcher .— Miyake & Imafuku, 1980: 5, pl. 2, fig. 3 ( Japan); Miyake, 1982, 1991: 114, pl. 38, fig. 5 ( Japan) [Not C. pulcher Forest, 1958 , see “Remarks”].

Material examined. French Polynesia, Austral Islands, BENTHAUS Expedition. Thiers Bank: stn DW 1927, 24°39.03’S, 146°01.58’W, 95–105 m, 13.xi.2002: 1 ɗ 5.0 mm ( MNHN Pg 6386). Off Raevavae, Lotus Bank: stn DW 1947, 23°48.51’S, 147°53.47’W, 120–150 m, 17.xi.2002: 1 ov. Ψ 4.4 mm ( MNHN Pg 6387). Tubuai: stn DW 1958, 23°19.64’S, 149°30.3’W, 80–150 m, 18.xi.2002: 2 ɗ 1.9–2.0 mm, 2 Ψ 1.8–2.2 mm ( MNHN Pg 6388); stn DW 1960, 23°19.77’S, 149°30.62’W, 230–262 m, 18.xi.2002: 2 Ψ 2.0–3.0 mm ( MNHN Pg 6390). Arago Bank: stn DW 1985, 23°26.35’S, 150°44.22’W, 100–107 m, 21.xi.2002: 1 ɗ 5.0 mm, 2 Ψ 3.0– 3.2 mm ( MNHN Pg 6389).

Additional material. Japan, Okinawa, Ryukyu Islands, unknown depth and date, coll. R.F. Bolland: 1 ɗ 2.4 mm ( USNM 1005010). New Caledonia, Loyalty Islands, LIFOU, stn 1463, Santal Bay, Gaatcha, dredge, sand and coral rubble, 20–30 m, 20°55.05’S, 167°03.35' E, 10.xi.2000: 1 spec. ( MNHN). French Polynesia, Tuamotu, Marutea South atoll, FRV Marara , stn CAS 243, 21°30.8’S, 135°38.5’W, 130 m, 30.v.1990: 1 spec. ( MNHN). Marquesas Islands, MUSORSTOM 9, 1997, Eiao Island, stn DW 1154, 07°58.50’S, 140°43.70’W, 102 m, 23.viii.1997: 1 spec. ( MNHN Pg 6357). Hiva Oa Island, stn DW 1204, 09°52.60’S, 139°03.20’W, 60–62 m, 28.viii.1997: 1 spec. ( MNHN Pg 6355). Nuku Hiva Island, stn DW 1170, 08°45.10’S, 140°13.10’W, 104–109 m, 25.viii.1997: 1 spec. ( MNHN Pg 6356); stn DW 1171, 08°44.90’S, 140°14.90’W, 248–252 m, 25.viii.1997: 2 spec. ( MNHN Pg 6358).

Diagnosis. Ocular acicles terminating in simple spine. Right chela with 4 or 5 corneous­tipped spines on upper margin. Left chela with outer face regularly convex. P3 with dactyl 0.8–1.1 as long as propodus; ventrodistal pilosity dense, brush­like. Telson with posterior lobes each with single terminal spine. Ocular peduncle uniformly white or pale orange fading distally. Antennular peduncles with proximal segments orange, distal segments white or cream. Antennal peduncles orange. Chelae bright orange or brown fading on distal half of palm and fingers. Ambulatory legs pale orange with dark orange stripes; stripes merging into intricate network of reticulations on propodi and dactyls, and in some specimens also on meri and carpi.

Distribution. Western and central Pacific: from Japan to French Polynesia. Depth: 18 to 262 m, more commonly from 100 to 250 m.

Habitat. In the Austral Islands this species was found occupying gastropod shells of the families Muricidae (Muricopsis) , Fasciolariidae ( Fasciolaria , Latirus ), and Bursidae (Bursa) .

Remarks. In smaller specimens the brush­like setation on P3 is sometimes reduced, and thus this character must be used with caution as a diagnostic character. Morphologically, Calcinus anani resembles C. areolatus Rahayu & Forest, 1999 , C. argus Wooster, 1984 , C. kurozumii Asakura & Tachikawa, 2000 , and C. revi Poupin & McLaughlin, 1998 . However, the coloration and depth distribution of C. anani are different from those species.

Calcinus anani is also very similar to C. sirius Morgan, 1991 . Separation of these two has been based on differences in density of ventrodistal pilosity of P3, and coloration ( Poupin & McLaughlin 1998). However, Asakura (2002) noted that the setation on P3 varies considerably, and that colour pattern in C. sirius is yet unknown, raising the possibility that C. anani and C. sirius might be conspecific.

Asakura & Nomura (2001) indicated that records of C. pulcher Forest, 1958 by Miyake & Imafuku (1980), and Miyake (1982), most likely are referable to C. anani . The book by Miyake (1982) was reprinted using the same pagination and figure numbers ( Miyake 1991).