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Orhoria lappa

Strophomenata - Strophomenida - Rafinesquinidae

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).

Synonymy list
YearName and author
1990Orhoria lappa Havlicek and Storch p. 76 figs. pl. 15 f. 3-4; pl. 16 f. 17
1999Leptaena lappa Havlicek and Storch

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phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
classStrophomenataWilliams et al 1996
orderStrophomenidaOpik 1934
superfamilyStrophomenoideaKing 1846
familyRafinesquinidaeSchuchert 1893
subfamilyLeptaeninaeHall and Clarke 1894
genusOrhoriaDalman 1828

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.

V. Havlicek and P. Storch 1990Similar 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.