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Orhoria lappa
Taxonomy
Orhoria lappa was named by Havlicek and Storch (1990). Its type specimen is VH 4301 and is a 3D body fossil.
It was recombined as Leptaena lappa by Havlicek and Storch (1999).
It was recombined as Leptaena lappa by Havlicek and Storch (1999).
Synonymy list
| Year | Name and author |
|---|---|
| 1990 | Orhoria lappa Havlicek and Storch p. 76 figs. pl. 15 f. 3-4; pl. 16 f. 17 |
| 1999 | Leptaena lappa Havlicek and Storch |
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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.
†Orhoria lappa Havlicek and Storch 1990
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| V. Havlicek and P. Storch 1990 | Similar to 0. provellerosa with a subrectangular to trapezoidal disc gently convex umbonally but flat or even gently concave laterally and anteriorly; disc 8-13 mm wide and less long than half of its maximum width. Anterior margin of the disc straight, sides moderately diverging toward hinge line. Disc bordered anteriorly and laterally by low, rounded ridge which passes into an edge toward mid-length. For this reason, the antero-lateral margins of the disc are more elevated than its anterior part at the disc/trail boundary. Trail dorsally directed, almost half as high as the maximum length of the disc. Apical foramen persisting throughout ontogeny; pseudodeltidium not examined. Brachial valve flat, antero-laterally (close to the upturned trail) gently concave; dorsal interarea not examined.
Rugae low, better developed on flanks of the disc than in the median sector; costellae low, rounded, about 6 per 2 mm. |
Measurements
No measurements are available
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| Source: g = genus, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Hendy et al. 2009, Aberhan et al. 2004 | |||||