Laomenes cornutus ( Borradaile, 1915 )

Marin, Ivan, Chan, Tin-Yam & Okuno, Junji, 2012, Crinoid-associated pontoniine shrimps of the genus Laomenes Clark, 1919 (Decapoda, Caridea, Palaemonidae) from PANGLAO 2004 and KUMEJIMA 2009 Expeditions, with description of two new species, Zootaxa 3367 (1), pp. 103-114 : 111

Laomenes cornutus ( Borradaile, 1915)

( Figs. 6 , 8d )

Periclimenes cornutus Borradaile, 1915: 211 [type locality: Malé Atoll , Maldive Islands].

Material examined. 1 male (pcl. 1.8 mm) ( NTOU M00954 ), Philippines, PANGLAO 2004, stn. R38 , Pamilacan Island , 9°29.4ʹN, 123°56.0ʹE, scuba diving, 6–37 m, 11 June 2004 ; 2 juveniles ( NTOU M00997 ), Philippines, PANGLAO 2004, stn. R75 , Panglao Island , west of Pontod, 9°32.8ʹN, 123°42.1ʹE, scuba diving, 3–35 m, 3 July 2004 .

Colouration. Body generally blackish-brown and bearing row of small yellowish-white dots along lateral margin of carapace and abdomen ( Fig. 8d ). Pereiopods and eyes also with yellowish-white dots.

Host. Unknown. Probably associated with dark coloured species feather star of the genus Comanthus (Echinodermata, Crinoidea, Comasteridae ).

Distribution. The species is known from the Maldive Islands (type locality; Borradaile 1915, 1917; Tchesunov et al. 1989 as “ Periclimenes amboinensis ”; Marin 2009) and now the Philippines (present study).

Remarks. The present specimens agree well with the previous descriptions of this rarely collected species (Bruce 1978; Tchesunov et al. 1989, as “ Periclimenes amboinensis ”; Marin, 2009). The distinguishing characters of L. cornutus are relatively smaller body size, short and stout eyestalk, chela of pereiopod II with stout cylindrical palm and characteristic structure of the dactylus of pereiopod III (see Marin 2009).

Figures

FIGURE 6. Laomenes cornutus (Borradaile, 1915), male (NTOU M00954): a, carapace and anterior appendages, lateral view; b, front of carapace, dorsal view; c, major pereiopod II; d, chela of minor pereiopod II; e, dactylus of pereiopod III.

FIGURE 8. Fresh colouration: a, Laomenes pestrushka n. sp., holotype, ovigerous female (RUMF-ZC-1399); b, L. gyrophthalmus n. sp., holotype, ovigerous female (NMCR); c, L. holthuisi Marin & Okuno, 2010, male (NTOU M00998); d, L. cornutus (Borradaile, 1915), male (NTOU M00954).