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Glyptambonites glyptus
Taxonomy
Glyptambonites glyptus was named by Cooper (1956). Its type specimen is USNM 117383a, a shell, and it is a 3D body fossil. Its type locality is Porterfield Quarry, 5 miles northeast of Saltville, which is in an Ashbyan reef, buildup or bioherm limestone in the Edinburg Formation of Virginia.
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Glyptambonites glyptus Cooper pp. 713 - 715 figs. Plate 168, A, figures i, 2; plate 173, C, figures 13-23; plate 175, A, figures 1-8 |
| 1962 | Glyptambonites glyptus Williams p. 160 figs. P1. XIV, figs. 33-35 |
| 2014 | Glyptambonites glyptus 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.
†Glyptambonites glyptus Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell semielliptical in outline, wider than long, thin, concavo-convex. Lateral margins slightly rounded; anterior margin broadly rounded. Cardinal extremities narrow acute to mucronate in the young but only slightly auriculate in the adult and old shells. Surface ornamented by costellae of different sizes, from 5 to 7 of the stronger costellae mark the umbonal region and the young stages, but in growth, costellae of intermediate size are intercalated between the primary ones and the finest costellae, covering the whole surface. Total strong costellae at the front margin about 20. Median costella usually the strongest of them all. Very fine costellae from 5 to 7 in a millimeter occupy the spaces between the stronger ones. Very fine concentric fila cancellate the fine costellae. Posterolateral region marked by strong oblique wrinkles and in the posterior quarter to half of the valves transverse wrinkles may undulate the sectors of shell marked out by the major costellae, these portions of the valve often suggesting the genus Ptychoglyptus in ornamentation.
Pedicle valve very slightly convex in lateral and anterior profiles. Central and posteromedian parts of the valve slightly swollen but the anterior, lateral, and posterolateral regions flattened. Beak small and protruding slightly beyond the posterior margin. Interarea flat, short, with narrowly rounded pseudodeltidium. Brachial valve gently concave in lateral profile ; umbo concave, small ; posterior part of valve nearly flat to very gently concave ; median region slightly concave. Lateral and posterolateral regions flattened. Interarea short, anacline to hypercline. Chilidium moderately large. Interior of pedicle valve with moderately deep delthyrial cavity ; dental plates mere remnants, divergent, with anterior ends thickened into false plates extending anteriorly around the outside margins of the muscle field. Teeth small, simple. Muscle field small, narrow ; diductor impression elongate, narrow, extending far anterior to the front of the delthyrial chamber. Adductor impressions confined to delthyrial chamber and placed far back, separating the posterior ends of the diductor impressions. Brachial valve with cardinal process having a strong median carina and smaller lateral accessory septa. Chilidium projecting over posterior half of cardinal process; cardinal process protruding in the direction of the pedicle valve and overhanging thickened area posterior to median septum. Brachial processes thin, short, widely divergent. Median septum short, thin, elevated at its anterior end. Adductor field subflabellate. | |
| A. Williams 1962 | Elongately semi-oval and concavo-convex Glyptambonites ornamented posteriorly by narrowly regular rugae, about 3 per millimetre, which are disposed concentrically to subtend an angle with the hinge-line of about 60 ~ in the median area but becoming more acute (about 30 ~ ) peripherally; radial ornamentation consisting of fine costeUae, about 8 per millimetre antero-medianly, segregated into sectors by widely spaced and strongly accentuated ribs, 5 of which extend from the umbo; dorsal median septum strong and high; ventral interior unknown. |