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Rhagasostoma
Taxonomy
Rhagasostoma is a genus. It is not extant.
It was assigned to Aspidostomatidae by Bassler (1953); to Cheilostomata by Sepkoski (2002); and to Onychocellidae by Koromyslova et al. (2018) and Koromyslova and Seltser (2020).
It was assigned to Aspidostomatidae by Bassler (1953); to Cheilostomata by Sepkoski (2002); and to Onychocellidae by Koromyslova et al. (2018) and Koromyslova and Seltser (2020).
Species
Species lacking formal opinion data
Synonymy list
Year | Name and author |
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1953 | Rhagasostoma Bassler p. G174 |
2002 | Rhagasostoma Sepkoski |
2018 | Rhagasostoma Koromyslova et al. p. 7 |
2020 | Rhagasostoma Koromyslova and Seltser p. 707 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Rhagasostoma
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†Rhagasostoma angliae Brydone 1936
†Rhagasostoma aralense Koromyslova et al. 2018
†Rhagasostoma brydonei Koromyslova et al. 2018
†Rhagasostoma gibbosulum Brydone 1936
†Rhagasostoma gibbosum Marsson 1887
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Invalid names: Rhagasostoma subgibbosum Brydone 1930 [synonym]
†Rhagasostoma inelegans Lonsdale 1850
†Rhagasostoma mimosa Brydone 1930
†Rhagasostoma minuens Brydone 1936
†Rhagasostoma operculatum Koromyslova et al. 2018
†Rhagasostoma saltans Brydone 1930
†Rhagasostoma tchvanovi Favorskaya 1992
Invalid names: Rhagasostoma gibbosum weybournensis Brydone 1930 [synonym]
Diagnosis
Reference | Diagnosis | |
---|---|---|
A. V. Koromyslova et al. 2018 | Colony encrusting or erect, vincularian and dichotomously branching. Autozooids subhexagonal; zooidal boundaries raised. Cryptocyst extensive, granular, sometimes peripheral caverns present. Gymnocyst lacking or minutely present. Opesia terminal or subterminal, occupying about one-third of the frontal surface, longitudinally elliptical, with deep opesiular indentations at the proximolateral corners, sometimes with occlusor lamina. Ovicells endozooidal or immersed. Avicularia vicarious and about the same size as autozooids, or interzooidal; opesia roundish or longitudinally elliptical, located centrally, usually with thin articular ridges bearing two short teeth proximally and a short or long, slit-like opesiular indentation between the teeth; sometimes wedge-like structures present. Kenozooids rounded or oval bifoliated and located at edges of colonies with opesia roundish, small. |