Asteronyx Müller & Troschel, 1842
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.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
Kingdom |
|
Phylum |
|
Class |
|
Order |
|
Family |