Ophiomyces Lyman, 1869

Stöhr, Sabine, 2024, Taxonomic analysis of the genital plates and associated structures in Ophiuroidea (Echinodermata), European Journal of Taxonomy 933, pp. 1-98 : 30-31

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.11197606

persistent identifier

https://treatment.plazi.org/id/038987D9-FF8F-D772-0006-C1591CE0FC2C

treatment provided by

Plazi

scientific name

Ophiomyces Lyman, 1869
status

 

Genus Ophiomyces Lyman, 1869 View in CoL

Fig. 12 View Fig

Type species

Ophiomyces frutectosus Lyman, 1869 View in CoL .

Examined species

Ophiomyces delata Koehler, 1904 View in CoL , O. frutectosus View in CoL .

Oral GP

Not examined, not identified in situ. Considered absent.

Adradial GP

Flat, thin, blade-like, ventral edge convex, dorsal edge straight, articular structure at distal end as embossed oval patch with finer stereom.

Abradial GP

Similar to adGP, articular patch depressed. When both GP are articulated, they are parallel, leaving a narrow slit between them.

Oral shields

Minute, elongated drop-shaped, with thickened rectangular distal end, depressed center of OS with coarse, porous stereom in external and internal views. Madreporite similar, with several small pores in middle part.

Radial shield

Absent.

Remarks

Matsumoto (1915, 1917) considered the abradial genital plate (his “genital scale”) and the radial shield in Ophiomyces to be absent ( Table 1 View Table 1 ). Lyman (1882) considered the radial shield to be absent, but both genital plates to be present ( Table 1 View Table 1 ), and the present study confirms his interpretation. They both described the adradial genital plate as curved over the top of the arm. Instead, both genital plates are flat and straight, and in the intact disc they may be upright or diagonal across the arm base ( Fig. 12E View Fig ). Oral GPs were not found after dissociating the skeleton and may be absent, since the adGP and abGP extend the full length from oral shield to disc edge, with the genital slit opening between them. Conditions in Ophiotholia spathifer (Lyman, 1879) are the same as in Ophiomyces .

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