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Isophragma extensum tricostatum
Taxonomy
Isophragma extensum tricostatum was named by Williams (1962). Its type specimen is BB.27545, a shell, and it is a 3D body fossil.
Synonymy list
| Year | Name and author |
|---|---|
| 1962 | Isophragma extensum tricostatum Williams p. 162 figs. Pl. XV, figs. 5, 7, 8-13 |
| 2014 | Isophragma extensum tricostatum Candela and Harper pp. Supplement 1 |
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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.
†Isophragma extensum tricostatum Williams 1962
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Williams 1962 | Semicircular Isophragma, initially with a dorsal median sulcus that passes into a low fold at about the 4-mm. growth-stage, ornamentation finely multicostellate with a modal count of 6 costellae per millimetre antero-medianly, median and 2 sublateral costae conspicuously thickened; submedian septa of the brachial valve slightly less than three-quarters as long as the valve and only slightly divergent, being less than one-quarter of their length apart anteriorly. |