Polyonyx triunguiculatus Zehntner, 1894, Zehntner, 1894

Osawa, Masayuki, 2007, Porcellanidae (Crustacea: Decapoda: Anomura) from New Caledonia and the Loyalty Islands, Zootaxa 1548, pp. 1-49: 38

publication ID

http://doi.org/ 10.5281/zenodo.178040

publication LSID

lsid:zoobank.org:pub:49DAF7AD-8803-4D20-82AC-6A1576DECCFE

persistent identifier

http://treatment.plazi.org/id/03809477-FFAB-BF37-ACF1-EA004B7C9CEB

treatment provided by

Plazi

scientific name

Polyonyx triunguiculatus Zehntner, 1894
status

 

Polyonyx triunguiculatus Zehntner, 1894  

( Fig. 12 View FIGURE 12 )

Polyonyx triunguiculatus Zehntner, 1894: 185   (type locality: Amboina).— Haig, 1979: 133, figs. 23–25.— Lewinsohn, 1969: 158, fig. 35.— Yang, 1996: 262, fig. 4.

Polyonyx acutifrons   de Man, 1896: 384 (type locality: Atjeh, Sumatra); 1898: pl. 32, figs. 49, 49a –d.

Material examined. New Caledonia. Canala Bay, Mackau Port, 0 m, mangroves, 30 Jul. 1997, coll. B. Richer de Forges, 2 males CL 4.2, 4.7 mm, 1 ovig. female CL 4.8 mm.

Loyalty Islands. Lifou Island. Santal Bay. Atelier LIFOU. St. 1429 (St. 1), Esao, 20 ° 47.5 ’S, 167 °07.1’E, 8–18 m, 24 Nov. 2000, 1 ovig. female CL 2.7 mm. St. 1420 (St. 26 B), Chépénéhé, 20 ° 47.7 ’S, 167 °09.35’E, 4–5 m, 20 Nov. 2000, 1 ovig. female CL 2.5 mm.

Remarks. Polyonyx triunguiculatus   is distinguished from the two most similar congeners, P. biunguiculatus   and P. obesulus   , by the well developed, narrow median lobe of the rostrum ( Fig. 12 View FIGURE 12 B), merus of the cheliped with a broad lobe on the distal dorsomesial margin ( Fig. 12 View FIGURE 12 C), and palm with a distinct, longitudinal crest on the ventral surface ( Fig. 12 View FIGURE 12 D). The median lobe of the rostrum of the carapace of P. triunguiculatus   is strongly bent ventrally, so the anterior margin is occasionally concave medially in dorsal view ( Fig. 12 View FIGURE 12 A).

The dactyli of the ambulatory legs have one or two corneous spines on the flexor margin ( Fig. 12 View FIGURE 12 E –G).

Distribution. Nansha Islands in South China Sea, Moluccas, Sumatra, Singapore, Indian Ocean from Gulf of Thailand and Western Australia to Red Sea and Madagascar. Shallow water to about 145 m, often on coral reefs ( Haig 1979; Yang & Naiyanetr 1997). This is the first record of P. triunguiculatus   from the southwestern Pacific Ocean. The specimens examined were collected at depths of 0–18 m in New Caledonia and the Loyalty Islands.

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Porcellanidae

Genus

Polyonyx

Loc

Polyonyx triunguiculatus Zehntner, 1894

Osawa, Masayuki 2007
2007
Loc

Polyonyx acutifrons

Man 1896: 384
1896
Loc

Polyonyx triunguiculatus

Yang 1996: 262
Haig 1979: 133
Lewinsohn 1969: 158
Zehntner 1894: 185
1894