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Taxonomy
Placunopsis was named by Morris and Lycett (1853) [Sepkoski's age data: Tr Olen-u T Dani Sepkoski's reference number: 545,1061]. It is not extant.
It was reranked as Terquemia (Placunopsis) by Bittner (1895).
It was assigned to Terquemia by Bittner (1895); to Plicatulidae by Marwick (1953); to Placunidae by Ronchetti (1970); to Terquemiidae by Vokes (1980); to Pterioida by Sepkoski (2002); to Placunopsidae by Bouchet et al. (2010); and to Anomiidae by Todd and Palmer (2002) and Lazo and Damborenea (2011).
It was reranked as Terquemia (Placunopsis) by Bittner (1895).
It was assigned to Terquemia by Bittner (1895); to Plicatulidae by Marwick (1953); to Placunidae by Ronchetti (1970); to Terquemiidae by Vokes (1980); to Pterioida by Sepkoski (2002); to Placunopsidae by Bouchet et al. (2010); and to Anomiidae by Todd and Palmer (2002) and Lazo and Damborenea (2011).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1853 | Placunopsis Morris and Lycett |
| 1895 | Terquemia (Placunopsis) Bittner |
| 1953 | Placunopsis Marwick p. 101 |
| 1970 | Placunopsis Ronchetti p. 56 |
| 1980 | Placunopsis Vokes p. 59 |
| 2002 | Placunopsis Sepkoski |
| 2002 | Placunopsis Todd and Palmer |
| 2010 | Placunopsis Bouchet et al. |
| 2011 | Placunopsis Lazo and Damborenea p. 730 |
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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.
G. †Placunopsis Morris and Lycett 1853
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†Placunopsis fibrosa Laube 1867
†Placunopsis gracilis Giebel 1856
†Placunopsis minuta Lundgren 1895
†Placunopsis napengensis Healey 1908
†Placunopsis nuka Imlay 1961
†Placunopsis obliqua Giebel 1856
†Placunopsis ostracina Schlotheim 1820
†Placunopsis parasita Bittner 1895
†Placunopsis parvula Stefanini 1939
†Placunopsis plana Giebel 1856
†Placunopsis rothi Marincovich, Jr. 1993
†Placunopsis rothpletzi von Wöhrmann 1889
†Placunopsis socialis Morris and Lycett 1853
†Placunopsis striatula Oppel 1856
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. A. Todd and T. J. Palmer 2002 | Medium-sized (< 60mm high), subcircular, thin-shelled and compressed anomiid. RV extremely thin, closely adpressed to substratum, with byssal notch (open foramen) surrounding an uncalcifed byssal plug;
medium sized adductor scar adjacent to postero-ventral margin of foramen. LV exterior with very fine to moderately strong radiating riblets. Interior with shallowly arched crus with adjoining buttress extending posteroventrally for length of foramen. Two prominent muscle scars present; a moderate-sized posterior pedal (byssal) retractor scar at 25±50 per cent height; touching at its posteroventral edge a smaller adductor scar. Also present is a minute anterior pedal retractor scar. Shell structure: RV, outer shell layer extremely thin, prismatic; inner shell layer of cross lamellar aragonite: LV, outer shell layer of foliated calcite; extensive cross lamellar aragonite inner shell layer, extending 80±90 per cent of distance to ventral margin. |