Amphiura gymnogastra Lütken & Mortensen, 1899

Granja-Fernández, Rebeca, Hendrickx, Michel E., Rangel-Solís, Pedro Diego & López-Pérez, Andrés, 2023, Deep-sea Ophiuroidea (Echinodermata) collected during the TALUD cruises in western Mexico, Zootaxa 5259 (1), pp. 1-71 : 50

publication ID

https://doi.org/ 10.11646/zootaxa.5259.1.1

publication LSID

lsid:zoobank.org:pub:4306F52E-FD24-45B0-B307-66B71173D805

DOI

https://doi.org/10.5281/zenodo.7798760

persistent identifier

https://treatment.plazi.org/id/03AB87FA-FF90-FFE4-FF7B-FD85FC73F971

treatment provided by

Plazi

scientific name

Amphiura gymnogastra Lütken & Mortensen, 1899
status

 

Amphiura gymnogastra Lütken & Mortensen, 1899 View in CoL

Fig. 15A‒F View FIGURE 15

Amphiura gymnogastra Lütken & Mortensen, 1899: 145‒146 View in CoL , pl. 9, figs. 6‒8.— H.L. Clark 1917: 437.

Hemilepis gymnogastra . Fell 1962: 10, 22.

Material examined. Four individuals at two stations. TALUD XII, Sta. 13, 3 ind. (ICML-EMU-11148-A); Sta. 26, 1 ind. (ICML-EMU-11148-B).

Comparative material. Syntypes, 5 ind.: MCZ OPH-1321 , USNM 19526 About USNM (Supplementary file 2) .

Description (ICML-EMU-11148-A). DD = 6.6 mm. Disc malformed. Dorsal disc covered by imbricated scales, those surrounding RS larger, integument distally. Primary plates not evident. RS triangular with rounded edges, prominent distal end, in contact only distally, the rest separated by scales ( Fig. 15A View FIGURE 15 ). Ventral interradii covered by scale-less integument ( Fig. 15B View FIGURE 15 ). OSh broader than long, spearhead-shaped with strongly convex proximal and lateral edges and distal lobe. Madreporite rounder and larger than OSh. AdSh scalene triangular, separated. Jaws bearing three oral papillae at each side; AdShSp scale-like round; BSc slender, pointed; IPa quadrangular with rounded edges. vT quadrangular ( Fig. 15C View FIGURE 15 ). Arms slender. DAP broader than long, oval, contiguous ( Fig. 15D View FIGURE 15 ). VAP longer than broad, pentagonal, contiguous. LAP with 5‒6 ArSp, small (approximately 1.2 arm segment in length), conical with blunt tip; ventralmost the longest, dorsalmost the thinnest and shortest. Tentacle pores with two oval TSc, adradial longer ( Fig. 15E View FIGURE 15 ). Color pattern in dorsally and ventrally beige-whitish (ethanol preservation) ( Fig. 15A‒F View FIGURE 15 ).

Habitat and distribution. Mexico, Panama, and the Galapagos Islands; 549‒ 2,323 m depth, hard and muddy substrates (Lütken & Mortensen 1899; H.L. Clark 1911; Maluf 1988; see Remarks). The material examined was collected off Colima and Guerrero; 1,199 ‒1,956 m depth.

Remarks. Specimens of Amphiura gymnogastra tend to lose their disc and oral papillae very easily, thus making correct identification very complicated. This species can have a dorsal disc covered with imbricated scales or with scales and small areas near the margin of the disc with only integument.Areas with integument in the dorsal disc can result from the pressure by the ventral disc on the dorsal side during the sampling process. Amphiura gymnogastra has been previously recorded off Panama and the Galapagos Islands (Lütken & Mortensen 1899; H.L. Clark 1911), and records off central and southern Mexico represent a significant extension of its northernmost distribution limit to 18º33′27″N, 104º28′21″W. Available material of A. gymnogastra is currently limited to 13 specimens: 1) the type material, which is not in good condition (MCZ OPH-1321, two specimens; USNM 19526, three specimens), 2) one lot from the Galapagos Islands (USNM E669, four specimens), and 3) two lots from the TALUD cruises (ICML -EMU-11148-A, three specimens; ICML-EMU-11148-B, one specimen).

MCZ

Museum of Comparative Zoology

Kingdom

Animalia

Phylum

Echinodermata

Class

Ophiuroidea

Order

Amphilepidida

Family

Amphiuridae

Genus

Amphiura

Loc

Amphiura gymnogastra Lütken & Mortensen, 1899

Granja-Fernández, Rebeca, Hendrickx, Michel E., Rangel-Solís, Pedro Diego & López-Pérez, Andrés 2023
2023
Loc

Hemilepis gymnogastra

Fell, B. H. 1962: 10
1962
Loc

Amphiura gymnogastra Lütken & Mortensen, 1899: 145‒146

Clark, H. L. 1917: 437
Mortensen, T. 1899: 146
1899
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