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

DOI

https://doi.org/10.5281/zenodo.5950042

persistent identifier

https://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 View in CoL

( Fig. 1B View FIGURE 1 )

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

Polyonyx heok Osawa & Ng, 2016: 506 View in CoL , 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 1 ) 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

Haig 1964 : 381
Osawa 2007a : 26
Loc

Polyonyx heok

Osawa & Ng, 2016 : 506
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