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Rhagasostoma
Taxonomy
Rhagasostoma was named by Koschinsky (1885) [Sepkoski's age data: K Ceno T Mi-u-u Sepkoski's reference number: 629,1260].
It was assigned to Aspidostomatidae by Bassler (1953); to Cheilostomata by Sepkoski (2002); and to Onychocellidae by Koromyslova et al. (2018), Koromyslova and Seltser (2020), Håkansson et al. (2024).
It was assigned to Aspidostomatidae by Bassler (1953); to Cheilostomata by Sepkoski (2002); and to Onychocellidae by Koromyslova et al. (2018), Koromyslova and Seltser (2020), Håkansson et al. (2024).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1885 | Rhagasostoma Koschinsky |
| 1953 | Rhagasostoma Bassler p. G174 |
| 2002 | Rhagasostoma Sepkoski |
| 2018 | Rhagasostoma Koromyslova et al. p. 7 |
| 2020 | Rhagasostoma Koromyslova and Seltser p. 707 |
| 2024 | Rhagasostoma Håkansson et al. p. 37 |
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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 Koschinsky 1885
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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 gibbosum weybournensis Brydone 1930 [synonym], Rhagasostoma subgibbosum Brydone 1930 [synonym]
†Rhagasostoma inelegans Lonsdale 1850
†Rhagasostoma infelix Håkansson et al. 2024
†Rhagasostoma mimosa Brydone 1930
†Rhagasostoma minuens Brydone 1936
†Rhagasostoma operculatum Koromyslova et al. 2018
†Rhagasostoma saltans Brydone 1930
†Rhagasostoma tchvanovi Favorskaya 1992
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. |
Measurements
No measurements are available
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| Source: f = family, o = order, c = class, uc = unranked clade | |||||
| References: Smith et al. 2006, Nesnidal et al. 2013 | |||||
Age range: base of the Late/Upper Turonian to the top of the Rupelian or 93.90000 to 27.30000 Ma
Collections (35 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Turonian | United Kingdom (England) | R. brydonei (216925) | |
| Coniacian | United Kingdom (England) | R. brydonei, R. minuens (216926) | |
| Late/Upper Santonian | United Kingdom (England) | R. inelegans (216921) R. minuens (216927) | |
| Santonian | United Kingdom (England) | Flustra inelegans (216920) | |
| Santonian - Maastrichtian | Russian Federation (Ulyanovsk) | Eschara volgensis (216948 216949) | |
| Campanian | Turkmenistan | R. operculatum (216938) | |
| Campanian | France | R. minuens (216930) | |
| Early/Lower Campanian | Germany (Niedersachsen) | R. inelegans (216922) | |
| Early/Lower Campanian | United Kingdom (England) | R. inelegans (216899) R. minuens (216928 216929) | |
| Early/Lower Campanian | Germany (Schleswig-Holstein) | R. minuens (216931) | |
| Early/Lower Campanian | Uzbekistan (Karakalpakstan) | R. aralense (216936) | |
| Late/Upper Campanian | Uzbekistan (Karakalpakstan) | Onychocella tchvanovi, R. rowei (216942) R. aralense, Onychocella tchvanovi (216937) | |
| Late/Upper Campanian | United Kingdom (England) | R. angliae (216932 216933) R. gibbosulum (216941) | |
| Late/Upper Campanian | Belgium (Hainaut) | R. rowei (216947) | |
| Late/Upper Campanian | Kazakhstan | R. gibbosum, R. rowei (216940) | |
| Late/Upper Campanian | Germany | R. angliae (216935) | |
| Late/Upper Campanian | Belarus | R. gibbosulum, R. inelegans, R. gibbosum, R. rowei (216924) | |
| Late/Upper Campanian | France | R. angliae (216934) | |
| Late/Upper Campanian | Turkmenistan | R. rowei (216951) | |
| Early/Lower Maastrichtian | United Kingdom (England) | R. minuens, R. angliae, Eschara rowei, R. gibbosum (159329) | |
| Early/Lower Maastrichtian | Germany (Schleswig-Holstein) | R. gibbosulum, R. gibbosum (216939) | |
| Early/Lower Maastrichtian | Australia (Western Australia) | R. infelix (235528 235531) | |
| Early/Lower Maastrichtian | Russian Federation (Saratov) | R. saltans (215305) | |
| Late/Upper Maastrichtian | Turkmenistan | R. rowei (216950 216952) | |
| Danian | Denmark | R. elegans, R. nysti (89866) | |
| Rupelian | USA (Alabama) | R. levigata (90563) |