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Phragmorthis eximia
Taxonomy
Phragmorthis eximia was named by Popov and Cocks (2014). Its type specimen is NMW 2001.38G.47, a valve (dorsal internal mould), and it is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2014 | Phragmorthis eximia Popov and Cocks pp. 737 - 738 fig. 21A–I |
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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.
†Phragmorthis eximia Popov and Cocks 2014
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. E. Popov and L. R. M. Cocks 2014 | Shell robust, strongly ventribiconvex, about as long as wide, with shallow dorsal median sulcus and weakly uniplicate anterior commissure. Radial ornament evenly multicostellate with 6–7 ribs per mm. Ventral interior with robust teeth, a distinct apical plate and a muscle field on a pseudospondylium confined to the bottom of an almost tubular delthyrial cavity. Dorsal interior with strongly thickened triangular median septum and a strongly impressed adductor muscle field extending anteriorly well beyond mid-valve. Notothyrial platform narrow, undercut anteriorly and occupying almost one-third valve length.
Shell strongly ventribiconvex, subpentagonal in outline, almost as wide as long and about 70% as thick as long. Hinge line about 90% of maximum shell width at about mid-length. Cardinal extremities rounded; anterior commissure weakly unisulcate. Ventral valve strongly and evenly convex, about 35% as thick as long with high (up to 4.8 mm), triangular, strongly apsacline interarea, gently curved in the umbonal part. Beak pointed, extending well beyond the hinge line. Delthyrium open and narrow with almost parallel sides, covered in the umbo by a gently concave apical plate. Dorsal valve transverse semioval, about 75% as long as wide, with a shallow median sulcus originating at the umbo and fading anteriorly. Lateral profile of dorsal valve moderately convex, with maximum height slightly posterior to mid-length. Dorsal interarea moderately high, curved, strongly anacline. Radial ornament multicostellate, with 6–7 ribs per mm at the anterior margin of mature shells. Ventral interior with robust teeth supported by very short, strongly thickened dental plates. Muscle field on pseudospondylium confined to the bottom of the narrow, almost tubular delthyrial cavity. Shell floor strongly swollen anterior to the muscle field. Mantle canal system saccate with subparallel vascula media . Dorsal interior with a high, narrow notothyrial platform strongly inclined posteriorly and undercut anteriorly, occupying almost one-third shell length. Cardinal process faint, ridge-like, bisecting the entire notothyrial platform. Brachiophores strongly thickened; their bases merged with the notothyrial platform. Median septum robust, high, subtriangular with an evenly curved anterior margin, terminating at about 15% of valve length from the anterior margin. Dorsal adductor muscle field with smaller transverse posterior adductor scars and deeply impressed, elongate suboval anterior adductor scars extending anteriorly slightly beyond the median septum and completely enclosed by strong muscle bounding ridges. |
Measurements
No measurements are available
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| Source: g = genus, o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Aberhan et al. 2004, Hendy 2009 | |||||
Collections
No collection or age range data are available