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Laticrura pionodema
Taxonomy
Laticrura pionodema was named by Cooper (1956). 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 | Laticrura pionodema Cooper p. 983 figs. pl. 144A, figs 1–25, pl. 144C, figs 30–33; pl. 145B, figs 14–16; pl. 146A, figs 1–4 |
| 1962 | Laticrura pionodema Williams pp. 144 - 145 figs. Pl. XII, figs. 49-51, 53, 54; PI. XIII, figs. 1-3 |
| 2012 | Laticrura pionodema Rasmussen et al. pp. 51 - 52 figs. Plate 14, figures 14–17 |
| 2014 | Laticrura pionodema 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.
†Laticrura pionodema Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Williams 1962 | Subcircular, strongly and unequally biconvex Laticrura with a long, curved, apsacline, ventral interarea so that the pedicle valve is almost one-half as deep as long; brachial valve over fourfifths as long as wide and nearly one-third as deep as long, broadly and deeply sulcate medianly; ornamented by fine, evenly developed costellae, commonly 5 or 6 per millimetre antero-medianly; ventral muscle-field, including a broad adductor scar and a pair of narrow, lateral diductors, elongately rectangular in outline and encroaching forward of the parallel dental lamellae for about one-third the length of the valve; apical plate sporadically developed; cardinal process weak, linear, brachiophore supporting plates strong, convergent on the median septum at almost one-quarter the length of the brachial valve forward of the umbo, median septum high and plate-like for about 3 mm. anterior to the cardinalia, and segregating a pair of lanceolate adductor fields each including a pair of scars with the narrower anterior ones extending almost into the anterior quarter of the brachial valve. | |
| C. M. O. Rasmussen et al. 2012 | Shell medium-sized, biconvex, probably unisulcate. Ornamentation multicostellate, with concentric growth lines developed in the anterior half of valve. Ventral interarea high, wide and strongly apsacline; delthyrium open, wide and high. Dorsal interarea high, wide and strongly anacline; notothyrium open, wide.
Ventral interior with large teeth supported by strong, divergent dental plates that converge onto valve floor to form elevated callus; accentuated, bilobed diductor muscle impressions separated by thick, elevated septum extending in the anterior part of valve; septum higher on callus than anteriorly. Dorsal interior with a simple, thin, blade-like cardinal process confined by long and very divergent brachiophores; brachiophores rectangular in section, continuing anterior to the notothyrial platform. Cardinal process variably developed. Crural plates fuse forming a strong, high dorsal median septum that extends anteriorly. Pair of weak side septa extending anteriorly up to mid-valve, is also present. |