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Ptychopleurella lapworthi

Rhynchonellata - Orthida - Hesperorthidae

Orthis lapworthi was named by Davidson (1883). Its type specimen is B55709, a valve (brachial valve), and it is a 3D body fossil.

It was synonymized subjectively with Glyptorthis balclatchiensis by Williams (1962); it was recombined as Ptychopleurella lapworthi by Harper (1986).

Sister species lacking formal opinion data

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Synonymy list
YearName and author
1883Orthis lapworthi Davidson p. 176 figs. pl. xii, figs. 9, 10
1945Orthis (Glyptorthis) biornata Cowper Reed
1986Ptychopleurella lapworthi Harper pp. 847 - 848 fig. 2

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EubilateriaAx 1987
phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
classRhynchonellataWilliams et al. 1996
orderOrthidaSchuchert and Cooper 1932
suborderOrthidinaSchuchert and Cooper 1932
superfamilyOrthoideaWoodward 1852
familyHesperorthidaeSchuchert and Cooper 1931
genusPtychopleurellaSchuchert and Cooper 1931
specieslapworthi(Davidson 1883)

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.

D. A. T. Harper 1986Transverse Ptychopleurella species with relatively low interarea; 13-15 costae and 14-18 costae are present on ventral and dorsal exteriors respectively, with two costae in dorsal sulcus; two costellae appear by internal branching in dorsal sulcus within 2 mm growth stage and two by external branching on either side of ventral medial rib.