Polyonyx boucheti Osawa, 2007

Osawa, Masayuki, Naruse, Tohru & Ng, Peter K. L., 2018, New records of species of the Polyonyx sinensis group (Crustacea: Decapoda: Anomura: Porcellanidae) from Japan, the Philippines, Singapore, and Malaysia, with descriptions of two new species, Zootaxa 4429 (2), pp. 303-323: 304-306

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Polyonyx boucheti Osawa, 2007


Polyonyx boucheti Osawa, 2007 

( Figs. 1A View Figure , 2 View Figure )

Polyonyx boucheti Osawa, 2007: 39  , figs. 13–15 (type locality: Mepinyo, Santal Bay, Lifou Island, Loyalty Islands; Atelier LIFOU: sta. 1446, 20°50.8´S 167°09.7´E, 36–40 m).— Osawa & McLaughlin 2010: 114 (list).— Osawa & Poupin 2013: 1, figs. 1, 2.

Polyonyx aff. boucheti  .—Poupin et al. 2013: 22, fig. 11D.

Material examined. Philippines. PANGLAO 2004 Marine Biodiversity Project: ZRC 2017.204View Materials, 1 male (cl 1.5 mm)  , 1 female (cl 1.7 mm), Alona Reef, Panglao Island , sta. B2, 9°33.0'N, 123°46.5'E, 5 m, reef slope, brushing, 31 May 2004GoogleMaps  ; ZRC 2017.205View Materials, 1 male (cl 1.6 mm), Doljo point, Panglao Island , sta. B12, 9°35.6'N, 123°43.2'E, 24– 27 m, reef slope, brushing, 14 June 2004GoogleMaps  ; ZRC 2017.206View Materials, 1View Materials ovigerous female (cl 1.7 mm), Napaling, Panglao Island , sta. B21, 9°37.2'N, 123°46.4'E, 20–21 m, reef wall with small caves, brushing, 24 June 2004GoogleMaps  ; ZRC 2017.207View Materials, 1 male (cl 1.3 mm), Pontod Lagoon, Panglao Island , sta. B39, 9°32.8'N, 123°42.1'E, 17–25 m, reef wall with small caves, brushing, 3 July 2004GoogleMaps  . Japan. Kume Island, Ryukyu Islands, KUMEJIMA 2009 Marine Biodiversity Expedition : RUMF-ZC-4735, 1 male (cl 1.7 mm), Madomari, fishing port, 2–3 m, on mooring rope, associated animal not recorded, coll. T. Komai, 21 November 2009  .

Coloration in life. Uncertain in the present specimens. The photographed specimen ( Fig. 1A View Figure ) may be a female from St. B2 of the PANGLAO 2004 Marine Biodiversity Project and it is very similar to an ovigerous female of P. boucheti  from Mayotte shown by Osawa & Poupin (2013: fig. 2) in the fresh coloration.

Distribution. Known only from the Loyalty Islands in the southwestern Pacific and Comoro Islands in the southwestern Indian Ocean ( Osawa & Poupin 2013); now from the Philippines, and the Ryukyu Islands in the north hemisphere side of the western Pacific.

Habitat. Coral-sand, depths of 5–40 m ( Osawa & Poupin 2013). The present specimens were found on a mooring rope in a fishing port at the depth of 2–3 m or collected by brushing coral rubble from reef slopes or walls at the depths of 5– 27 m. Although all the known specimens of P. boucheti  have not been recorded as commensal of any animals, the species probably lives symbiotically with a tube-dwelling polychaete as in many species of the P. sinensis  group defined by Johnson (1958) (cf. Ng & Sasekumar 1993; Werding 2001; Osawa & Poupin 2013). The host polychaetes may be small-sized, non-chaetopterids that live in fragile tubes.

Remarks. The present specimens agree well with the descriptions of P. boucheti  by Osawa (2007) and Osawa & Poupin (2013) in diagnostic aspects, except for the somewhat proportionally broader carpus of the cheliped ( Fig. 2C View Figure ) and comparatively stouter ambulatory legs, particularly the propodi ( Fig. 2E View Figure ).














Polyonyx boucheti Osawa, 2007

Osawa, Masayuki, Naruse, Tohru & Ng, Peter K. L. 2018


Polyonyx boucheti

Osawa 2007: 39


Polyonyx aff. boucheti

Osawa 2007