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Ptychopleurella lapworthi
Taxonomy
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).
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
Synonyms
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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.
†Ptychopleurella lapworthi Davidson 1883
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Invalid names: Glyptorthis biornata Reed 1945 [synonym]
Diagnosis
Reference | Diagnosis | |
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D. A. T. Harper 1986 | Transverse 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. |