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Idiospira thomsoni
Taxonomy
Rhynchonella thomsoni was named by Davidson (1868).
It was recombined as Idiospira thomsoni by Williams (1962) and Candela and Harper (2014).
It was recombined as Idiospira thomsoni by Williams (1962) and Candela and Harper (2014).
Synonymy list
| Year | Name and author |
|---|---|
| 1868 | Rhynchonella thomsoni Davidson p. 186 figs. pl. xxiv, fig. 18. |
| 1917 | Rhynchonella thomsoni Reed p. 927 figs. Plate XXII, figs. 29-32 |
| 1962 | Idiospira thomsoni Williams pp. 248 - 249 figs. PI. XXV, figs. 31-42 |
| 2014 | Idiospira thomsoni 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.
†Idiospira thomsoni Davidson 1868
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. R. C. Reed 1917 | The presence of 2-3 marginal plications in the sinus of the pedicle-valve, the broad low fold with 2-3 plications on it in the brachial valve, the presence of lateral plications, and the absence of such sharp well-defined edges to the sinus help to distinguish it from C. balclatchiensis, but it is a variable species. In the more transverse varieties with accentuated fold and sinus we see a resemblance to C. Peachi, and the flattened more elongated examples are difficult to distinguish from the Craighead variety of C. cuneatella. DAVIDSON'S type of the species C. Thomsoni was found at Craighead. The internal characters are unfortunately unknown. The more transverse swollen shells may possibly be the adult shells, and the flatter, more triangular ones, like DAVIDSON'S figured one, may be immature individuals. The frequent want of symmetry in the development of the plications is noticeable in this and allied species. | |
| A. Williams 1962 | Large, subcircular to trigonal, biconvex Idiospira with shells almost three-fifths as deep as wide and pedicle valves almost nine-tenths as wide as long; adult shells variably uniplicate with the dorsal fold bearing up to 6 costae due to bifurcations of initially bicostate or tricostate patterns, and with up to 3 pairs of costae ornamenting the antero-lateral areas; dental lamellae long, slightly divergent. |
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Nesnidal et al. 2013 | |||||