Asteronyx Müller & Troschel, 1842

Stöhr, Sabine, 2024, Taxonomic analysis of the genital plates and associated structures in Ophiuroidea (Echinodermata), European Journal of Taxonomy 933, pp. 1-98 : 24-25

publication ID

https://doi.org/ 10.5852/ejt.2024.933.2525

publication LSID

lsid:zoobank.org:pub:8F720F2B-BFBC-4CA1-BFF2-A2B8C7C8D3E1

DOI

https://doi.org/10.5281/zenodo.11197601

persistent identifier

https://treatment.plazi.org/id/038987D9-FF85-D774-004D-C4A51CCAFDAB

treatment provided by

Plazi

scientific name

Asteronyx Müller & Troschel, 1842
status

 

Genus Asteronyx Müller & Troschel, 1842 View in CoL

Fig. 8 View Fig

Type species

Asteronyx loveni Müller & Troschel, 1842 View in CoL .

Examined species

Asteronyx loveni View in CoL .

Oral GP

Absent.

Adradial GP

Half as long as in-disc part of arm. Flat, widest part half as wide as length, distally upwards curved, tapering to rounded proximal end. Terminating distally in a rounded condylar process with flat surface and at a small distance ventrally a half circle-shaped groove. Offset from fused abGP by longitudinal slits, not separating plates.

Abradial GP

Firmly fused to dorsal edge of adGP. Blade-like flat, longer than adGP, half as wide as adGP, abradial proximal half slightly depressed. Both GPs aligned along arm vertebrae with single flat surface.

Oral shields

Madreporite widely drop-shaped, externally with several small pores, inner side with deep middle depression, two irregular pores on either side. No regular oral shields.

Radial shield

Superficially appearing as long bar-like structures, consisting of a short distal part with widened end and for most of its length composed of multiple layers of thin, irregular, overlapping plates. Distal end with flat articular structure and a curved dorsal ledge. Proximally at a distance a round patch of finer mesh stereom. RS and adGP articulate by muscles and connective tissue, hard parts touching only at internal edge, evidenced by the wide gap between them in the relaxed disc.

GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF