Loganellia

Loganellia
Loganellia scotica
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Thelodonti
Order: Loganelliformes
Family: Loganellidae
Genus: Loganellia
Fredholm, 1990
Type species
Loganellia scotica
(Traquair, 1898)
Loganellia, swimming in a shallow sea 400 million years ago.

Loganellia is a genus of jawless fish which lived between 430 - 370 million years ago, during the Devonian and Silurian epochs of the Paleozoic.[1] Loganellia belonged to the Thelodonti class and like other Thelodonts possessed scales instead of plate armor.

Loganellia are thought to be more closely related to the crown group of gnathostomes than conodonts. They are noted for their denticle whorls - oropharyngeal denticles that lined their branchial bars - which are thought to be homologous with other, later gnathostome teeth. In this sense, Loganellia may possess the earliest known dental structures related to modern teeth, and would have evolved in the throat, rather than through dermal denticles or jaws.[1]

References

  1. 1 2 Ungar, Peter (2010). Mammal Teeth: Origin, Evolution and Diversity. Baltimore: Johns Hopkins University Press. p. 77.
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