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Discinisca
Taxonomy
Discinisca was named by Gray (1840) [Sepkoski's age data: J l R Sepkoski's reference number: 538]. It is extant.
It was assigned to Disciniidae by Martin (1904), Frassinetti and Covacevich (1999), Williams et al. (2000); to Acrotretida by Sepkoski (2002); and to Discinidae by Hertlein and Grant IV (1944), Pérez et al. (2023).
It was assigned to Disciniidae by Martin (1904), Frassinetti and Covacevich (1999), Williams et al. (2000); to Acrotretida by Sepkoski (2002); and to Discinidae by Hertlein and Grant IV (1944), Pérez et al. (2023).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1840 | Discinisca Gray |
| 1904 | Discinisca Martin p. 402 |
| 1944 | Discinisca Hertlein and Grant IV p. 23 |
| 1999 | Discinisca Frassinetti and Covacevich p. 14 |
| 2000 | Discinisca Williams et al. p. 86 |
| 2002 | Discinisca Sepkoski |
| 2023 | Discinisca Pérez et al. p. 206 |
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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. Discinisca Gray 1840
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†Discinisca circularis Gabb 1864
†Discinisca conviva Gerassimov 1955
†Discinisca cumingii Broderip 1833
†Discinisca cumingii hannibali Hertlein and Grant IV 1944
†Discinisca fallens Wood 1874
†Discinisca holdeni Tate 1867
†Discinisca infraoolithica Rolliere 1829
†Discinisca jenkinsi Hertlein and Grant IV 1944
†Discinisca kamikatetuensis Yabe and Hatai 1935
Discinisca laevis Sowerby 1822
Discinisca lamellosa Broderip 1834
Discinisca lamellosa sensu Hondt 1976
†Discinisca loeli Hertlein and Grant IV 1944
†Discinisca lugubris Conrad 1834
†Discinisca messii Pérez et al. 2023
†Discinisca oregonensis Dall 1909
†Discinisca perrini Hertlein and Grant IV 1944
†Discinisca porvenir Pérez et al. 2023
†Discinisca scutellum Dreger 1889
†Discinisca steiningeri Radwanska and Radwanski 1989
Discinisca strigata Broderip 1834
†Discinisca yaroslavensis Gerassimov 1955
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. E. Pérez et al. 2023 | Shell dorsibiconvex to convexconcave, subcircular; ornamentation of fine growth lines that may become lamellose peripherally, with or without fine ribs; ventral valve with large depressed area around pedicle track, internally with small triangular median septum extending posteriorly from aprex on to listrium; lophophore in recent forms spirolophous (from williams et al., 2000: 86) |