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Isistius
Taxonomy
Isistius was named by Gill (1864) [Sepkoski's age data: T Than R Sepkoski's reference number: 2,884]. It is extant.
It was assigned to Scymnorhinidae by Casier (1958), Jordan (1963), Cassier (1966); to Dalatiinae by Laurito (1996), Yabe and Hirayama (1998); to Squalidae by Casier (1946), Purdy et al. (2001); to Squaliformes by Sepkoski (2002); and to Dalatiidae by Kocsis (2007), Carillo-Briceño et al. (2014), Villafaña et al. (2020), Popov et al. (2025).
It was assigned to Scymnorhinidae by Casier (1958), Jordan (1963), Cassier (1966); to Dalatiinae by Laurito (1996), Yabe and Hirayama (1998); to Squalidae by Casier (1946), Purdy et al. (2001); to Squaliformes by Sepkoski (2002); and to Dalatiidae by Kocsis (2007), Carillo-Briceño et al. (2014), Villafaña et al. (2020), Popov et al. (2025).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1864 | Isistius Gill |
| 1946 | Isistius Casier p. 49 |
| 1958 | Isistius Casier p. 35 |
| 1963 | Isistius Jordan p. 602 |
| 1966 | Isistius Cassier p. 64 |
| 1996 | Isistius Laurito p. 88 |
| 1998 | Isistius Yabe and Hirayama p. 38 |
| 2001 | Isistius Purdy et al. p. 87 |
| 2002 | Isistius Sepkoski |
| 2007 | Isistius Kocsis p. 29 |
| 2014 | Isistius Carillo-Briceño et al. p. 80 |
| 2020 | Isistius Villafaña et al. |
| 2025 | Isistius Popov et al. |
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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. Isistius Gill 1864
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†Isistius triangulus Probst 1879
Isistius trituratus Winkler 1874
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: o = order, subp = subphylum | |||||
| References: Carroll 1988, Wagner 2023, Hendy et al. 2009 | |||||
Age range
Maximum range based only on fossils: base of the Thanetian to the top of the Early/Lower Pliocene or 59.24000 to 3.60000 Ma
Minimum age of oldest fossil (stem group age): 56.0 Ma
Minimum age of oldest fossil (stem group age): 56.0 Ma
Collections (30 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Thanetian | USA (California) | I. trituratus (189952) | |
| Ypresian | United Kingdom (England) | I. trituratus (8050 13299 76601 185906) | |
| Wasatchian | USA (Virginia) | I. trituratus (15595) | |
| Lutetian | Ukraine | I. trituratus (211009) | |
| Lutetian | Russian Federation | I. trituratus (234684 234686) | |
| Lutetian | United Kingdom (England) | I. trituratus (41989 41992 41996 41998) | |
| Lutetian | Ukraine (Luhansk) | I. trituratus (120885) | |
| Middle Eocene | Ukraine (Crimea) | I. trituratus (140018) | |
| Middle Eocene | Uzbekistan | I. trituratus (62573) | |
| Priabonian | Barbados | I. sp. (205153) | |
| Early/Lower Miocene | Slovakia | I. triangulus (47461) | |
| Burdigalian | Hungary | I. triangulus (210623) | |
| Burdigalian | Germany (Bavaria) | I. triangulus (210593) | |
| Serravallian | France | I. sp. (85338) | |
| Tortonian | Panama (Colon) | I. sp. (160781) | |
| Tortonian | Panama | I. sp. (24237) | |
| Late/Upper Miocene | Costa Rica (Limon) | I. triangulus (162678) | |
| Late/Upper Miocene - Early/Lower Pliocene | Costa Rica (Limón) | I. triangulus (220760) | |
| Tortonian - Zanclean | Ecuador | I. triangulus (204352) | |
| Messinian - Zanclean | Japan (Chiba) | I. sp. (70006) | |
| Zanclean | Ecuador (Esmeraldas) | I. triangulus (151705) | |
| Zanclean | USA (North Carolina) | I. sp. (52582) | |
| Pliocene | Ecuador (Esmeraldas) | I. triangulus (151893) |