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Leptoskelidion loci
Taxonomy
Leptoskelidion loci was named by Cocks (1982). Its type specimen is PMO 104.022 (internal mould of a brachial valve) and is a 3D body fossil.
Synonymy list
| Year | Name and author |
|---|---|
| 1982 | Leptoskelidion loci Cocks pp. 764 - 768 figs. Plate 80, figs. 9-14 |
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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.
†Leptoskelidion loci Cocks 1982
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. R. M. Cocks 1982 | Exterior. Biconvex shells with subcircular but slightly transverse outline and short hinge line; no trace of fold or sulcus. Small anacline brachial valve interarea and fairly small curved apsacline pedicle valve interarea. Open delthyrium and notothyrium. Weak ribs, 6 per mm at 3 mm anteriorly from the umbo; ribs curving round laterally but not merging with hinge line. Growth lines obscure.
Pedicle valve interior. Teeth large, supported by prominent but slender dental plates initially diverging at approx. 40° and curving anteriorly (sometimes changing direction at a single sharp point) to diverge for about 20° for most of their length (even slightly incurving in two specimens) before merging quickly anteriorly with the valve floor. Muscle field less than one-third valve length, but details of musculature obscure. Vascular markings usually obscure, apart from traces of vascula media in a few specimens immediately anteriorly of the muscle field. Brachial valve interior. Cardinal process thin and blade-like, merging anteriorly with the median septum which swells to a maximum thickness at about 3 mm anteriorly from the umbo and extends for up to half the valve length. The expanded brachiophore bases are subparallel posteriorly and then curve round to converge anteriorly and join the median septum in a well-defined sessile cruralium. The brachiophore bases also extend laterally to fuse with the hinge line to form prominent socket plates. Suboval adductor muscle scars poorly impressed on either side of the median septum anterior to the sessile cruralium. |