Bothrophyllidae Fomichev, 1953
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publication ID |
https://doi.org/ 10.1186/s13358-023-00296-0 |
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persistent identifier |
https://treatment.plazi.org/id/49386916-7F00-FFE2-FC91-FEF4FD14FE28 |
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treatment provided by |
Felipe |
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scientific name |
Bothrophyllidae Fomichev, 1953 |
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Family Bothrophyllidae Fomichev, 1953 . Genus Bothrophyllum Trautschold, 1879 .
Type species: Turbinolia conica Fischer von Waldheim, 1837 View in CoL .
Diagnosis: see Kora et al. (2019).
Geographic and stratigraphic range: Bothrophyllum is known from the Viséan to the lower Permian, being typical of the Pennsylvanian (Chwieduk, 2013). It is recorded from the British Isles, Northern Spain, North Africa, Donets and Moscow basins, Ural Mountains, China, Australia, and North America.
Bothrophyllum okense Kossovaya, 2001
( Fig. 13B View Fig 1–B View Fig 4 View Fig ).
Material: One preserved corallite (RAh 37), collected from the basal shales of lower member of the Aheimer Formation. Tree transverse thin-sections are available.
Description: External characters: Te corallite is ca. 20 mm in length. Calyx and apical end parts of are largely eroded. Te external wall is partly damaged, eroded and enclosed in fossiliferous mud ( Fig. 13B View Fig 1 View Fig ). Te outer wall of the corallite in cross section is irregular.
Internal characters: Te early preserved growth stage
( Fig. 13B View Fig 2 View Fig ), in a diameter of 14 mm there are 30 major septa. All major septa are long, some reach more than 2/3 of the corallite radius, leaving a small axial area which is filled with a diagenetically altered axial structure formed from the axial ends of the major septa and axial tabellae. Septa are strongly thickened in the tabularium, but thin in the very narrow dissepimentarium that consists of two rows of dissepiments. In the following higher section ( Fig. 13B View Fig 3 View Fig ) cardinal and counter septa are long and meet in the corallite center forming an axial septum that contributes with other septal axial ends in making a loose axial structure. At this stage, there are 31 septa for about 14 mm. In the higher mature thin-section near the eroded calice ( Fig. 13B View Fig 4 View Fig ), all septa are broken due to the compaction of the calicular part. Tere are about 34 septa in 13.5 mm compressed diameter. Te counter septum is still long and reach the corallite centre, in contrast to the cardinal septum that seems to be shorten ( Fig. 13B View Fig 4 View Fig ). Te axial structure that formed of the axial tabellae and inner ends of the longest major sept is still present. In a fairly good-preserved part of the corallite wall, a narrow dissepimentarium composed of 2 rows of simple concentric inter-septal dissepiments is present ( Fig. 13B View Fig 4 View Fig ). Cardinal fossula is poorly developed. Minor septa are very short, confined to the dissepimentarium in the mature section
( Fig. 13B View Fig 4 View Fig ), enter the tabularium as thick pegs.
Discussion: Te specimen shows greatest similarity to Bothrophyllum okense Kossovaya, 2001 from the Moscovian of the Moscow Basin in Russia, despite the incomplete preservation and the diagenetic alteration of the skeleton of the current species. It was compared with the Egyptian slightly older bothrophyllids (Rod EL Hamal Formation) and with other Moscovian and Kasimovian Bothrophyllum spp. from the type region of the Moscow Basin have been discussed by Kora et al. (2019; Table 1).
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