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Taxonomy
Modiolopsis regularis was named by Barrande (1881). Its type specimen is NM L 22 768, a shell (conjoined valves), and it is a 3D body fossil.
It was recombined as Phthonia regularis by Kříž (2008).
It was recombined as Phthonia regularis by Kříž (2008).
Synonymy list
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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.
†Phthonia regularis Barrande 1881
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Kříž 2008 | Ludlovian Phthonia with well developed fine radial costellae dorsally of umbonal ridge and in the posterior part of the shell.
Shell small to medium size (L = 15.9–21.7; H = 9.3–12.3), elongate elliptical, equivalved, inequilateral, and obese (H/W = 1.20–1.26). Lunule developed. Umbones sub-anterior, relatively large, beaks are prosogyrate. Umbonal ridge well defined, becoming obsolete before reaching post-inferior extremity. Dorsal margin long, about 55–64% the shell length. Anterior end is short, lobate, posterior end is subangular. Posterior margin is evenly round, ventral margin is long and almost parallel with dorsal margin, slightly convex. Anterior margin evenly rounded. Outer surface sculpture of ventral part of the shell is smooth, with irregular growth wrinkles or very little convex narrow growth bands. Radial costellae are developed in dorsal part of the shell, dorsally of umbonal ridge, and may be seen also in the posterior part of the shell in a very low angle strong light. Inner surface is smooth. Ligament is opisthodetic, in wide and deep groove bordered by narrow ligamental nymphs. Interior unknown. Shell very thin. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Kiessling 2004, Aberhan et al. 2004 | |||||