Polyonyx heok Osawa & Ng, 2016

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: 306-307

publication ID

https://doi.org/10.11646/zootaxa.4429.2.6

publication LSID

lsid:zoobank.org:pub:E42066C8-070D-4742-80FE-726B9B92883A

persistent identifier

http://treatment.plazi.org/id/B61EB057-FFFA-FFC0-FF06-AEE3A4B2F1AC

treatment provided by

Plazi

scientific name

Polyonyx heok Osawa & Ng, 2016
status

 

Polyonyx heok Osawa & Ng, 2016 

( Fig. 1B View Figure )

Polyonyx pedalis  . — Haig 1964: 381.— Osawa 2007a: 26, fig. 3; 2007b: 37 (not Polyonyx pedalis Nobili, 1906  ).

Polyonyx heok Osawa & Ng, 2016: 506  , figs. 6–8, 15C, D (type locality: Singapore Strait, Pulau Jong , 1°12’54”N 103°47’12”E, 15.4 m).GoogleMaps 

Material examined. Japan. Iriomote Island, Ryukyu Islands: RUMF-ZC-4395, 1 male (cl 3.7 mm), Nazuni, off 

Sonai, Dive 1, 20 m, in tube of Chaetopterus pacificus  (RUMF-ZO-23), SCUBA diving, coll. T. Naruse & R. Yoshida, 30 September 2016; RUMF-ZC-4736, 1 ovigerous female (cl 7.6 mm), Nazuni, off Sonai, Dive 2, 20 m, in tube of C. pacificus  (RUMF-ZO-24), SCUBA diving, coll. T. Naruse & R. Yoshida, 30 September 2016. Kagoshima Prefecture ( southern Kyushu ): RUMF-ZC-4501, 1 male (cl 9.0 mm), 1 ovigerous female (cl 10.7 mm), Tategamiiwa, Okikojima  , Kagoshima (Sakurajima, Kinko Bay ), 19.8 m, in tube of C. pacificus  (RUMF-ZO-26), SCUBA diving, coll. R. Yoshida, D. Uyeno, Y. Endo & T. Naruse, 25 October 2016  ; RUMF-ZC-4502, 1 male (cl 9.4 mm), 1 ovigerous female (cl 10.5 mm), Kannonzaki, Kagoshima (Sakurajima, Kinko Bay ), 15 m, in tube of C. pacificus  (RUMF-ZO-25), SCUBA diving, coll. R. Yoshida, D. Uyeno, Y. Endo & T. Naruse, 24 October 2016  .

Coloration in life. The coloration of the specimens examined ( Fig. 1B View Figure ) agrees well with what was reported by Osawa & Ng (2016).

Distribution. Known from wide area of the western Pacific: Singapore, Indonesia, New Caledonia, Vanuatu, and Japan ( Osawa & Ng 2016). The previous record of P. heok  from the Japanese waters was based on a specimen from Okinawa Island, Ryukyu Islands. The present specimens extend the distribution range of the species to the north, Kagoshima in Kyushu, Japan.

Habitat. Occurring on sand and mud; depths of 7–65 m ( Osawa & Ng 2016). The type specimens of P. heok  are a heterosexual pair from Singapore and were collected from the tubes of Chaetopterus aff. pacificus Nishi, 2001  , living on sandstones in subtidal reefs ( Osawa & Ng 2016). The specimens examined from Iriomote Island and Kagoshima were obtained from parchment tubes of Chaetopterus pacificus  which usually adhere to the underside of rocks partially buried in sand or gravel bottom. These suggest that P. heok  probably prefers to live symbiotically with species of Chaetopterus  that have their tubes underneath rocks.

Remarks. The present specimens agree well with the original description of P. heok  by Osawa & Ng (2016) in all diagnostic aspects. Two heterosexual pairs from Kagoshima (males, cl 9.0, 9.4 mm; ovigerous females, cl 10.5, 10.7 mm; RUMF-ZC-4501, 4502) are the largest known specimens.

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Porcellanidae

Genus

Polyonyx

Loc

Polyonyx heok Osawa & Ng, 2016

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

2018
Loc

Polyonyx pedalis

: 381 : 26

Loc

Polyonyx heok

: 506