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Costachonetes pygmaea
Taxonomy
Chonetes pygmaea was named by Loczy (1899) [Chonetes cf. uralica var. pygmaea]. It is the type species of Costachonetes.
It was recombined as Costachonetes pygmaea by Waterhouse (1975), Liao (1979), Li et al. (1986) and Shen et al. (2017).
It was recombined as Costachonetes pygmaea by Waterhouse (1975), Liao (1979), Li et al. (1986) and Shen et al. (2017).
Synonymy list
| Year | Name and author |
|---|---|
| 1899 | Chonetes pygmaea Loczy |
| 1967 | Chonetes pygmaea Yanagida p. 87 figs. Pl 21, fig 2 |
| 1975 | Costachonetes pygmaea Waterhouse p. 2 |
| 1979 | Costachonetes pygmaea Liao p. 534 figs. Pl 2, fig 1 |
| 1986 | Costachonetes pygmaea Li et al. figs. Pl 7, fig 4 |
| 2017 | Costachonetes pygmaea Shen et al. p. 678 figs. Pl P3, 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.
†Costachonetes pygmaea Loczy 1899
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. B. Waterhouse 1975 | Small Chonetacea, ventral valve swollen medianly, with minute ventral sinus over umbo or extending for length of shell, dorsal valve deeply depressed medianly. Ears well developed, ornament on both valves of branching costellae, row of ventral hinge spines, and numerous body spines. Interior as recorded by Chao (1928, p.20), with median dorsal septum. |