Eutrichiurides
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| Eutrichiurides Temporal range: | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Scombriformes |
| Family: | Trichiuridae |
| Genus: | †Eutrichiurides Casier, 1944 |
| Type species | |
| †Trichiurides delheidi Leriche, 1908 | |
| Species | |
|
See text | |
Eutrichiurides ("true Trichiurus resemblance") is an extinct genus of cutlassfish known from the early Paleocene to the early Oligocene.[1][2]
Species within this genus include:[3]
- †E. africanus Dartevelle & Casier, 1949 - mid-late Paleocene (Selandian to Thanetian) of Angola (Landana Formation)[4][5]
- †E. delheidi (Leriche, 1908) (type species)- Early Oligocene of Belgium (Boom Clay) (=Trichiurides delheidi Leriche, 1908)[6]
- †E. orpiensis (Leriche, 1906) - Early Paleocene of Morocco & North Dakota, USA (Cannonball Formation), Late Paleocene of Belgium, Early Eocene of England[7][8]
- †E. plicidens (Arambourg, 1952) - middle Eocene (early Lutetian to middle Bartonian) of Alabama, USA (Tallahatta, Lisbon and Gosport Sand Formations), potentially Bartonian of Libya[9]
- †E. goberti Casier, 1944 - Early Eocene of Tunisia (Gafsa-Metlaoui Basin)[10]
- †E. termieri (Arambourg, 1952) - Late Paleocene/Early Eocene of Morocco (Ouled Abdoun Basin)[11][12]
E. delheidi is the only member of this genus known from partial skull elements (including a partial jawbone) instead of only isolated teeth. The former species E. winkleri Casier, 1946 from the London Clay[13] has been moved to its own genus, Macroynis, as an indeterminate trichiuroid, as there is no evidence that it is a member of this genus.[6]
Fossil teeth of an indeterminate Eutrichiurides have been recovered from the high-latitude Eureka Sound Formation of Nunavut, Canada, suggesting that this genus ranged as far north as the Arctic Circle during the Early Eocene Climatic Optimum.[14] Indeterminate teeth are also known from the middle Eocene-aged Shark River Formation of New Jersey,[15] the Early Eocene-aged Khuiala Formation & Cambay Shale of Gujarat & Rajasthan, India,[11][16] the late Eocene-aged Fayum Depression of Egypt,[17] and the Early Oligocene of the Paris Basin of France.[18]
