Temporal range: Early Ordovician – Late Devonian
|Tentaculitids from the Devonian of Maryland.|
von Schlotheim 1820
Tentaculites is an extinct genus conical fossil of uncertain affinity, known from Lower Ordovician to Upper Devonian deposits both as calcitic shells with a brachiopod-like microstructure and carbonaceous 'linings'. The "tentaculites" (i.e. tentaculita) are also referred to as the styliolinids.
The taxonomic classification of tentaculitids is uncertain, but some group them with pteropods. They may also be related to other conical shells of uncertain affinity including cornulitids, microconchids and trypanoporids. Their shell microstructure has warranted their comparison with the brachiopods and phoronids.
Tentaculitids have ribbed, cone-shaped shells which range in length from 5 to 20 mm. Some species septate; their embryonic shell, which is retained, forms a small, sometimes spherical, chamber.
Some species are inferred to have been planktonic.
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