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Cyrtonotella subfissicosta
Taxonomy
Orthis (Plectorthis) subfissicosta was named by Reed (1917) [= 1883. Orthis intercostata, Portlock, Davidson, Mon. Brit. Foss. Brach., vol. v, Silur. SuppL, p. 226].
It was recombined as Cyrtonotella subfissicostata by Williams (1962); it was recombined as Cyrtonotella subfissicosta by Candela and Harper (2014).
It was recombined as Cyrtonotella subfissicostata by Williams (1962); it was recombined as Cyrtonotella subfissicosta by Candela and Harper (2014).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1917 | Orthis (Plectorthis) subfissicosta Reed pp. 834 - 835 figs. Plate VI, fig. 21 |
| 1962 | Cyrtonotella subfissicostata Williams pp. 105 - 106 figs. Pl. VIII, figs. 27, 32, 39 |
| 2014 | Cyrtonotella subfissicosta 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.
†Cyrtonotella subfissicosta Reed 1917
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Williams 1962 | Semi-elliptical to subquadrate, unequally biconvex to concavo-convex Cyrtonotella with acute angles in immature growth-stages and with a gently convex pedicle valve and a sulcate brachial valve that is slightly convex umbonally and probably gently concave in adult forms; ornamentation fascicostellate with about 13 costeUae per 5 mm. antero-medianly; ventral muscle-scar short, about oneninth as long as the pedicle valve with an acutely triangular adductor track ending in a small median boss, and widely splayed diductor scars not extending very much beyond the traces of abbreviated dental lamellae; cardinal process bulbous posteriorly, passing anteriorly into a broad, low, median ridge, brachiophores short, widely 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 | |||||