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Thebesia scopulosa

Rhynchonellata - Rhynchonellida - Trigonirhynchiidae

Taxonomy
Thebesia scopulosa was named by Cocks (1982). Its type specimen is PMO 104.027 and is a 3D body fossil.

Synonymy list
YearName and author
1982Thebesia scopulosa Cocks p. 778 figs. Plate 84, figs 1- 11

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
Lophophorata
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classRhynchonellataWilliams et al. 1996
orderRhynchonellidaKuhn 1949
superfamilyRhynchotrematoideaSchuchert 1913
familyTrigonirhynchiidaeMcLaren 1965
subfamilyVirginiatinaeAmsden 1974
genusThebesiaAmsden 1974
speciesscopulosa

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.

Diagnosis
ReferenceDiagnosis
L. R. M. Cocks 1982Exterior. Outline subtriangular, with prominent erect pedicle valve beak with relatively straight sides, which often curve anteriorly to become laterally concave in outline. Small but functional pedicle opening. Variable convexity, from nearly flat to fairly globose. About twelve ribs, difficult to count laterally since they merge with the flat shell sides; ribbing stronger anteriorly from about half valve length, the ribs curving gently antero-laterally. Anterior commissure usually fairly straight, but simple fold and sulcus sometimes weakly developed.

Pedicle valve interior. Teeth supported by well-developed but slender dental plates, subparallel on valve floor, but diverging slightly dorsally. Small transverse pedicle collar weakly developed at approximately the same distance anteriorly as the teeth. Muscle field not impressed.

Brachial valve interior. Cardinal process absent. Median septum present to half or two-thirds of the valve length. Prominent socket plates extend anteriorly to form crural bases, underneath which a small crurualium is present posteriorly. Indistinct suboval impressions of adductor muscle scars present on either side of the median septum.