Asteronyx luzonicus Döderlein, 1927

Baker, Alan N., Okanishi, Masanori & Pawson, David L., 2018, Euryalid brittle stars from the International Indian Ocean Expedition 1963 - 64 (Echinodermata: Ophiuroidea: Euryalida), Zootaxa 4392 (1), pp. 1-27: 7-8

publication ID

https://doi.org/10.11646/zootaxa.4392.1.1

publication LSID

lsid:zoobank.org:pub:B6A80A66-E868-4578-A5E5-655E0F18AA84

persistent identifier

http://treatment.plazi.org/id/03D88782-FFDA-FFAF-7896-F88065EEFD26

treatment provided by

Plazi

scientific name

Asteronyx luzonicus Döderlein, 1927
status

 

Asteronyx luzonicus Döderlein, 1927 

( Figs. 4F –GView FIGURE 4, 5A –CView FIGURE 5)

Asteronyx luzonicus Döderlein, 1927: 64  , pl. 7 figs. 4–6d.

Material Examined. USNM 1072474View Materials, Anton Bruun Cruise 1 Station 17, southern Andaman Sea, 7° 38’ N 97° 09’ E, 280– 275 m, 21 March 1963, 1 specimenGoogleMaps  ; Anton Bruun Cruise 7 Station 369F, off southern Mozambique, 24° 07’S, 36° 11’–15’E, 1600–1628 m, 17 August 1964, 1 specimen  .

Remarks. The disc diameters of the two specimens are 15 mm ( Fig. 4F –GView FIGURE 4) and 6 mm respectively. The larger specimen has narrow arms approximately 140 mm long ( Fig. 4F –GView FIGURE 4). The larger specimen has a naked skin-covered disc with dark spots aborally and orally ( Fig. 5A –BView FIGURE 5), and with some light calcification between one pair of radial shields ( Fig. 5AView FIGURE 5). The genital slit is narrow, situated between arm segments 1 and 3, and is not in a pouch ( Fig. 5BView FIGURE 5), as in the type species, A. loveni  . At arm segment 22, the lowermost arm spine is elongate, with a terminal club ( Fig. 5CView FIGURE 5). This elongate arm spine is not present on the smaller specimen, and may therefore be ontogenetic as is the number of arm spines. A similar enlargement of mid-arm spines has been noted in A. loveni ( Baker 1980)  . The dark spots on their disc is a main diagnostic character of A. luzonicus ( Döderlein, 1927)  .

This species has remarkable bathymetric distribution, between 109 and 2963 m. A. luzonicus  was originally described from the Philippines; its occurrence in the southern Andaman Sea and the Mozambique Channel represents a considerable extension of its geographic range, but one that might be expected given its bathymetric range.

Kingdom

Animalia

Phylum

Echinodermata

Class

Ophiuroidea

Order

Euryalida

Family

Asteronychidae

Genus

Asteronyx

Loc

Asteronyx luzonicus Döderlein, 1927

Baker, Alan N., Okanishi, Masanori & Pawson, David L. 2018
2018
Loc

Asteronyx luzonicus Döderlein, 1927 : 64

Döderlein, 1927 : 64