Brochocarina, Brunton, 1968
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publication ID |
https://doi.org/ 10.4202/app.2008.0309 |
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persistent identifier |
https://treatment.plazi.org/id/1B17B006-D46F-9727-2EC8-012D47D9FB47 |
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treatment provided by |
Felipe |
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scientific name |
Brochocarina |
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Brochocarina ? sp.
Fig. 20 View Fig .
Material.—Two ventral and 9 dorsal valves mostly fragmentary but with well preserved internal structure.
Remarks.—The material is very fragmentary but reveals internal structures of the ventral and dorsal valves which seem to be characteristic for the family Orthotetidae . The most characteristic are low, discrete cardinal process lobes and recurved socket ridges which diverge at 20–24 ° from hinge line ( Fig. 20B View Fig ). Between the lobes there is a wide median ridge terminating antero−ventrally as a node of variable extent. Inside the ventral valve there is a short median septum which is confined to the most posterior region of the valve ( Fig. 20A View Fig 2 View Fig , A 5, C 2 View Fig ). Ornamentation of the valves is parvicostellate with fine radial costellae showing two kinds of distribution. In most specimens from sample M2−8 they are fine and closely spaced ( Fig. 20A, D View Fig ). On the other hand on specimens from sample GB and a few from sample M2−8 the costellae are separated by wider interspaces ( Fig. 20B, C View Fig ) suggesting that they may be not conspecific with the former. Unfortunately, the present material does not allow to establish whether this variability is intra− or interspecific.
The studied specimens are tentatively referred to Brochocarina on the basis of their costellate pattern which involves intercalation rather than branching.
Stratigraphic and geographic range.—The species was revealed in samples M2−8 and GB.
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