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Trematis norvegica
Taxonomy
Trematis norvegica was named by Cocks (1982). Its type specimen is PMO 104.018 (pedicle valve) and is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1982 | Trematis norvegica Cocks p. 757 figs. Plate 78, figs. 1-4 |
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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.
†Trematis norvegica Cocks 1982
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. R. M. Cocks 1982 | Large trematid, biconvex but relatively thin in profile. Outline subcircular, but variable, sometimes appreciably longer than wide and vice versa. Brachial valve beak diverging widely (at 120° to 140°) and protruding just beyond pedicle valve margin. Ornament of fine radial costellae (8 per mm at 3 mm from the umbo of the holotype) and growth lines of about the same strength between and interrupted by the costellae, combining to give a mesh-shaped arrangement, the whole interrupted by occasional accentuated growth lines at sporadic intervals. V-shaped pedicle opening with margins diverging at approximately 80° and with a length of 5 mm in the holotype. Obscure muscle scars faintly impressed near the centre of the brachial value. |