Protoconodont
class of marine worms
Protoconodonts are an extinct group of Cambrian animals known from fossilized phosphatic tooth-like structures. They were originally described as an informal group of early conodonts, though more recent studies consider them to be more closely related to chaetognaths (arrow worms).
Protoconodont elements are slender and pointed, with a hollow interior which opens towards the base of the structure. They develop entirely by the addition of layers to the inner cavity, extending the rim of the base. There is no additional mineralization on the outer surface, in contrast to paraconodonts or euconodonts (true conodonts). Protoconodont elements are frequently found bundled together into 'superteeth', paired claw-like clusters which may have had a grasping function. These 'superteeth' were previously known by the name "Prooneotodus" tenuis, now classified as a species of Phakelodus. A few protoconodont genera were previously assigned to the class Conodonta and the order Paraconodontida, and the genus Amphigeisina was even given its own superfamily, Amphigeisinacea. Protoconodonts were assumed to have been forerunners to paraconodonts, and by extension euconodonts.
It is now thought that protoconodont elements (e.g., Protohertzina anabarica Missarzhevsky, 1973), are probably grasping jaw spines of stem group chaetognaths rather than the oropharyngeal (mouth or throat) elements of paraconodonts or true conodonts.
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This entry incorporates text from “Protoconodont” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.