Loganellidae
Loganellidae is an extinct family of class Thelodonti in the order Loganelliiformes. They are distinguished by their star or cross shaped scales ridges located on the head.
| Loganellidae | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Infraphylum: | Agnatha |
| Order: | †Loganelliformes |
| Family: | †Loganellidae |
Morphology
The head scales possess cross shaped or star shaped ridges, transitional scales are rhomboidal, and trunk scales are horizontally elongated. The crown is notably posteriorly pointed, with the apex extending beyond the base. The main crown surface is flat and smooth, and can be inclined in either horizontal direction. The base of the crown possesses a short spine which points downwards and anteriorly.[1][2]
References
- Marss, Tiiu (7 February 2006). "Theolodonts (Agnatha) from the basal beds of the Kuressaare Stage, Ludlow, Upper Silurian of Estonia" (PDF).
- "Loganellia scotica, TRAQUAIR, 1898". The Fossil Forum. Retrieved 2021-10-03.
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