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Dalmanella cheesemani
Taxonomy
Dalmanella cheesemani was named by Williams (1962) [= Orthis (Dalmanella) federata Reed 1917, p. 851 pars, pl. ix, figs. 22-23, non figs. 16-21, 24--27.]. Its type specimen is BB.25979, a valve (Internal mould of brachial valve), and it is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1962 | Dalmanella cheesemani Williams pp. 132 - 134 figs. Pl. XII, figs. 7-10 |
| 2014 | Dalmanella cheesemani 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.
†Dalmanella cheesemani Williams 1962
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Williams 1962 | Unequally and gently biconvex, subcircular to subquadrate Dalmanella, with a sulcate brachial valve averaging slightly less than three-quarters as long as wide; ornamentation fascicosteUate with secondaries very commonly developed within 2 mm. of the dorsal umbo; myophore of cardinal process bulbous and only exceptionally bilobed, socket and supporting plates commonly discrete, rarely masked by secondary shell substance in adult shells, with the latter pair of structures extending anteriorly for about one-eighth the length of the brachial valve; ventral muscle-scar subcordate, averaging just over one-quarter the length of the pedicle valve; vascula media initially slightly divergent. |