Pagurixus ruber Komai & Osawa, 2006

Komai, Tomoyuki & Rahayu, Dwi Listyo, 2013, Records Of The Hermit Crab Genus Pagurixus Melin, 1939 (Decapoda: Anomura: Paguridae) From Shallow Coral Reefs In The Panglao Islands, The Philippines, With Description Of A New Species, Raffles Bulletin of Zoology 61 (1), pp. 133-141 : 135-136

Pagurixus ruber Komai & Osawa, 2006

Pagurixus boninensis – McLaughlin & Haig, 1984: 124 (part), fig. 1a, c, d, f, g

Pagurixus ruber Komai & Osawa, 2006: 92 , figs. 40–43, 46B, 48; McLaughlin et al., 2007: 250, unnumbered fig.; 2010: 32 (list); Komai, 2010: 1321

Material examined. — PANGLAO 2004, stn B8, Panglao Island , Napaling, 09°37.1'N, 123°46.1'E, 3 m, subtidal reef platform, 7 Jun.2004, 1 female (sl 1.8 mm), ZRC 2012.0932 ; stn R40 , Pamilacan Island , 09°29.2'N, 123°55.1'E, 8–33 m, damaged coral slope, 12 Jun.2004, 1 female (sl 2.0 mm), ZRC 2012.0933 .

females (sl 2.1–3.0 mm), ZRC 2012.0943 ; stn B41, Balicasag Island , 09°30.9'N, 123°40.8'E, 17–19 m, floor of large cave, 4 Jul.2004, 1 male (sl 2.8 mm), 1 female (sl 2.9 mm), 1 ovig. female (sl 2.2 mm), MNHN-IU-2009-2406; stn B42, Panglao Island , between Momo and Napaling, 30–33 m, ledge on reef wall, 09°37.0'N, 123°46.0'E, 6 July 2004, 1 female (sl 2.3 mm), MNHN-IU-2009-2407; North coast of Panglao, Jul.2004 – May 2005, coll. J. Arbasto, 1 male (sl 2.9 mm), ZRC 2012.0944 ; stn R3 , Panglao Island , Alona reef, 09°33.0'N, 123°46.5'E, 5–24 m, base of reef slope, May–Jul.2004, 1 male (sl 1.6 mm), ZRC 2012.0945 .

Colour in life. — See Fig. 1 . Body and appendages generally pale pink. Ocular peduncle with brown spot on dorsal surface adjacent to base of cornea and pale brown transverse band at midlength. Antennular peduncle with distal half of ultimate segment dark brown. Antennal peduncle with fifth segment having lateral red stripe; antennal flagella alternated with white and brown every three or four articles. Carpus of right cheliped with red longitudinal stripe on lateral surface medially. Merus also with two red longitudinal stripes on lateral surface. Left cheliped also with thin red longitudinal stripes; palm with three dorsal and one ventral stripes; carpus with stripes along dorsolateral and dorsomesial margins and two stripes on each lateral and mesial face; merus with one dorsal, three lateral, three mesial and two ventral stripes. Ambulatory legs also with red longitudinal stripes; dactyli each with three lateral and three mesial stripes; propodi each with three lateral and three mesial stripes, ventral surface not clearly striped but with tinge of red; carpi each with four lateral and four mesial stripes, ventralmost stripe sometimes obscure; meri each with dorsal and ventral surfaces bordered by lateral and mesial stripes, and with three lateral and two mesial stripes.

Distribution. — Heretofore known with certainty from New Caledonia and Chesterfield Islands; 28– 58 m. Newly recorded from the Philippines, 3– 27 m.

Remarks. — The present series of specimens agrees well with the type description by Komai (2010). Superficially, this species closely resembles Pagurixus maorus in the morphology and the striped pattern of colouration in the thoracic appendages, but the lack of setal rows on the ventral surface of the ultimate segment of the antennular peduncle will immediately distinguishes P. rubrovittatus from P. maorus . When the colour is still preserved, the presence of a dark ring on the ultimate segment of the antennular peduncle is characteristic to P. rubrovittatus .

Figures

Fig. 1. Pagurixus rubrovittatus Komai, 2010, male (sl 2.5 mm), ZRC 2012.0939, PANGLAO 2004, stn 32-12. Entire animal in dorsal view, showing colouration in life.