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Morphology Ecology and taphonomy   Age range and collections

Dinorthis (Pionorthis)

Rhynchonellata - Orthida - Plaesiomyidae

Discussion

Jin et al. (2007) proposed to abolish the genus Pionorthis because its type species, Orthis sola Billings, 1866, belongs to the dalmanelloid genus Mendacella. Billings’ original type specimen has rarely been examined, and the specimen (YPM S-760; see Pl. 13, figs. 14–20) used as O. sola, initially by Schuchert and Cooper (1932) and subsequently in the two editions of the Treatise (Williams and Wright 1965; Williams and Harper 2000), belongs to P. carletona.

Taxonomy
Dinorthis (Pionorthis) was named by Schuchert and Cooper (1932) [Sepkoski's age data: O Ashg-m Sepkoski's reference number: 1].

It was reranked as Pionorthis by Williams et al. (2000) and Sepkoski (2002); it was replaced with Plaesiomys by Jin et al. (2007).

It was assigned to Dinorthis by Schuchert and Cooper (1932); to Plaesiomyinae by Williams et al. (2000); and to Orthida by Sepkoski (2002).

Synonymy list
YearName and author
1932Dinorthis (Pionorthis) Schuchert and Cooper
2000Pionorthis Williams et al. p. 748
2002Pionorthis Sepkoski, Jr.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
Lophophorata
phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
RankNameAuthor
classRhynchonellataWilliams et al. 1996
orderOrthidaSchuchert and Cooper 1932
suborderOrthidinaSchuchert and Cooper 1932
superfamilyOrthoideaWoodward 1852
familyPlaesiomyidaeSchuchert 1913
subfamilyPlaesiomyinaeSchuchert 1913
genusDinorthisHall and Clarke 1892
subgenusPionorthis

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.

Diagnosis
No diagnoses are available