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Sulevorthis parvicrassicostatus
Taxonomy
Orthambonites parvicrassicostatus was named by Cooper (1956). Its type specimen is USNM 116872a, a shell, and it is a 3D body fossil.
It was recombined as Paralenorthis parvicrassicostata by Rigby and Potter (1986); it was recombined as Paralenorthis parvicrassicostatus by Gutiérrez−Marco and Villas (2007); it was recombined as Sulevorthis parvicrassicostatus by Jaanusson and Bassett (1993) and Candela and Harper (2014).
It was recombined as Paralenorthis parvicrassicostata by Rigby and Potter (1986); it was recombined as Paralenorthis parvicrassicostatus by Gutiérrez−Marco and Villas (2007); it was recombined as Sulevorthis parvicrassicostatus by Jaanusson and Bassett (1993) and Candela and Harper (2014).
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Orthambonites parvicrassicostatus Cooper pp. 309 - 310 figs. Plate 35 B, figures 11-25 |
| 1962 | Orthambonites parvicrassicostatus Williams pp. 98 - 99 figs. Pl. VII, fig. 44; P1. VIII, figs. 1-5 |
| 1986 | Paralenorthis parvicrassicostata Rigby and Potter |
| 1993 | Sulevorthis parvicrassicostatus Jaanusson and Bassett |
| 2007 | Paralenorthis parvicrassicostatus Gutiérrez−Marco and Villas p. 557 |
| 2014 | Sulevorthis parvicrassicostatus Candela and Harper p. SI |
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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.
†Sulevorthis parvicrassicostatus Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell small, slightly wider than long, lateral margins gently rounded to nearly straight, anterior margin narrowly rounded. Cardinal extremities obtuse or produced into minute ears. Anterior commissure sulcate. Hinge slightly wider or slightly narrower than the shell width at the middle. Surface marked by 16 to 18 angular costae that widen anteriorly. Interspaces about equal to the width of the costae, crossed by fine concentric fila.
Pedicle valve with lateral profile gently convex and with the greatest convexity at about the middle. Umbo strongly convex. Anterior profile strongly humped in the median region with the flanks descending moderately steeply to the lateral margins. Median region of 5 largest costae somewhat elevated to produce a fold. Interarea short, beak strongly incurved. Brachial valve gently convex with the greatest convexity in the region posterior to the middle. Beak small, umbo small, smooth, short. Sulcus originating just anterior to the umbo, widening rapidly to occupy about half the width. Four costae occupy the sulcus. Flanks defined by a slight elevation of the 2 costae bounding the sulcus. Posterolateral extremities flattened. Pedicle interior with small teeth, and short, stout dental plates. Muscle area slightly thickened, extending anterior to the anterior ends of the dental plates. Brachial interior with short, stout brachiophores supported by a moderately thickened notothyrial platform. Cardinal process thickened on the anterior face. | |
| A. Williams 1962 | Small, subquadrate to subcircular, unequally biconvex Orthambonites with the more convex pedicle valve over four-fifths as long as wide and more than one-third as deep as long, ornamented by 16-20 angular costae, most commonly 18 or 19, with an average wave-length of over 0.5 mm. anteromedian to the dorsal umbo; ventral muscle-scar subcordate, about as wide as long and over one-third as long as adult pedicle valves; dorsal adductor field deeply impressed, oval, extending anteriorly for over one-half the length of the valve and divided by a longer median septum. |