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Triactoma
Taxonomy
Triactoma was named by Rüst (1885) [Sepkoski's age data: Tr Ladi K Albi-u].
It was assigned to Heliosestrinae by Loeblich and Tappan (1961); to Xiphostylidae by Zügel (1997), Hull (1997), De Wever et al. (2001); and to Spumellaria by Sepkoski (2002).
It was assigned to Heliosestrinae by Loeblich and Tappan (1961); to Xiphostylidae by Zügel (1997), Hull (1997), De Wever et al. (2001); and to Spumellaria by Sepkoski (2002).
Species
Triactiscus lanceola, Triactiscus triacuminatus, Triactiscus tricuspis, Triactiscus tripodiscus, Triactiscus tripyramis, T. amajacensis, T. blakei, T. cellulosa, T. foremanae, T. frequens (syn. Tripocyclia notabilis), T. hexeris, T. hidalgoensis (syn. T. robusta), T. ilsedense, T. jonesi, T. kellumi, T. mexicana, T. pachyacantha, T. parablakei, T. paramexicana, T. prolongata, T. rosespitensis, T. spinosa (syn. Tripocyclia superba), T. tenuspinea, T. tithonianum
Species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1881 | Triactis Haeckel |
| 1885 | Triactoma Rüst |
| 1887 | Triactiscus Haeckel |
| 1961 | Triactoma Loeblich and Tappan |
| 1997 | Triactoma Hull p. 69 |
| 1997 | Triactoma Zügel |
| 2001 | Triactoma De Wever et al. p. 117 |
| 2002 | Triactis Sepkoski |
| 2002 | Triactoma Sepkoski |
| 2005 | Triactiscus Popova-Goll 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. †Triactoma Rüst 1885
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†Triactoma amajacensis Pessagno et al. 1989
†Triactoma blakei Pessagno 1977
†Triactoma cellulosa Foreman 1973
†Triactoma foremanae Muzavor 1977
†Triactoma frequens Pessagno et al. 1989
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Invalid names: Tripocyclia notabilis Pessagno et al. 1989 [synonym]
†Triactoma hexeris O'Dogherty 1994
†Triactoma hidalgoensis Pessagno et al. 1989
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Invalid names: Triactoma robusta Yang 1993 [synonym]
Triactoma ilsedense Rüst 1885
†Triactoma jonesi Pessagno 1977
†Triactoma kellumi Pessagno et al. 1989
†Triactoma mexicana Pessagno et al. 1989
Triactoma pachyacantha Rüst 1885
†Triactoma parablakei Yang and Wang 1990
†Triactoma paramexicana Pessagno and Yang 1989
†Triactoma prolongata Pessagno et al. 1989
†Triactoma rosespitensis Carter 1988
†Triactoma tenuspinea Yang 1993
†Triactoma tithonianum Rüst 1885
Invalid names: Triactis Haeckel 1881 [replaced], Triactiscus Haeckel 1887 [synonym]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: p = phylum | |||||
| Reference: Kiessling 1999 | |||||
Age range
Maximum range based only on fossils: base of the Early/Lower Pliensbachian to the top of the Late/Upper Santonian or 192.90000 to 83.60000 Ma
Minimum age of oldest fossil (stem group age): 184.2 Ma
Minimum age of oldest fossil (stem group age): 184.2 Ma
Collections (348 total)
Oldest occurrences | |||
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Pliensbachian | Canada (British Columbia) | T. rosespitensis (119768 119775) | |
| Late/Upper Pliensbachian | Austria (Styria) | T. rosespitensis (95555) | |
| Late/Upper Pliensbachian | USA (Oregon) | T. sp., Tripocyclia sp. A (124323) T. spp. (124325) | |
| Pliensbachian | USA (California) | T. sp. (87216) | |
| Pliensbachian | Mexico (Baja California Sur) | T. rosepitensis (33567) | |
| Late/Upper Pliensbachian - Early/Lower Toarcian | Russian Federation (Primorskiy Kray) | T. sp. (92793) | |
| Early/Lower Toarcian | Japan | T. rosespitensis (124830) T. southforkensis (51710) | |
| Early/Lower Toarcian | USA (Oregon) | T. spp. (124328 124333 124335) | |
| Early/Lower Toarcian - Middle Toarcian | Russian Federation (Primorskiy Kray) | T. sp. (92795) | |
| Middle Toarcian | USA (Oregon) | T. spp. (124336 124337) | |
| Middle Toarcian - Late/Upper Toarcian | Japan | T. rosespitensis (120007) | |
| Middle Toarcian - Late/Upper Toarcian | Canada (British Columbia) | Tripocyclia rosespitense, Tripocyclia sp. B (71099) Tripocyclia sp. B (71095 71096) | |
| Middle Toarcian - Late/Upper Toarcian | Greece | T. sp., T. jonesi (142135) | |
| Middle Toarcian - Early/Lower Aalenian | Greece | T. sp. (142133) | |
| Late/Upper Toarcian - Middle Aalenian | Russian Federation (Primorskiy Kray) | T. sp. (92798) | |
| Aalenian | Japan | T. jakobsae (120019) | |
| Aalenian | Canada (British Columbia) | Tripocyclia sp. B (71127) | |
| Aalenian | USA (Oregon) | T. spp. (127221 127222) | |
| Early/Lower Aalenian | Germany | T. sp. (59493 59495 59496 59497) | |
| Early/Lower Aalenian | Canada (British Columbia) | T. jakobsae (119855) | |