Ectoganus
Extinct genus of taeniodonts
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Ectoganus ("outside brightness")[12] is an extinct genus of taeniodonts from tribe Ectoganini within subfamily Stylinodontinae and family Stylinodontidae, that lived in North America from the Late Paleocene to Early Eocene.[13][14][15][16]
| Ectoganus | |
|---|---|
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| head of Ectoganus gliriformis (Robert Bruce Horsfall, 1913) | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | †Taeniodonta |
| Family: | †Stylinodontidae |
| Subfamily: | †Stylinodontinae |
| Tribe: | †Ectoganini Cope, 1876[1] |
| Genus: | †Ectoganus Cope, 1874[2] |
| Type species | |
| †Ectoganus gliriformis Cope, 1874 | |
| Species | |
| Synonyms[5] | |
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synonyms of genus: synonyms of species:
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Description
The microscopic structure of Ectoganus tooth enamel consists of a single main layer. The internal enamel feature known as the Hunter-Schreger band is present but is weakly developed. The enamel is composed of tightly packed rod-like structures (prisms) that show a keyhole-shaped cross-section and only a partially formed outer sheath. The underlying dentine — the main structural tissue of the tooth — follows a typical mammalian pattern. A relatively thick layer of cementum, the tissue that helps anchor teeth in the jaw, covers both the front and back surfaces of the teeth.[17]
Phylogeny
| Placentalia |
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