Hydnoceras

Hydnoceras is an extinct genus of sponges that existed from the Upper Devonian through the end of the Pennsylvanian.[1]

Hydnoceras
Temporal range: Upper Devonian–Pennsylvanian[1]
Hydnoceras bathense specimen on display at the Senckenberg Museum für Naturkunde Görlitz in Germany
Scientific classification
Kingdom: Animalia
Phylum: Porifera
Class: Hexactinellida
Order: †Reticulosa
Genus: †Hydnoceras
Conrad, 1842
Species
  • Hydnoceras avoca
  • Hydnoceras bathense
  • Hydnoceras eutheles
  • Hydnoceras phymatodes
  • Hydnoceras variabile
Synonyms

Hydroceras Dawson & Hinde, 1889

Description

Hydnoceras specimens are typically around 8.375 inches long, and about 3.5 inches wide. 8 pronounced ridges run down along the length of the sponge and are crossed by horizontal ridges, producing conical swellings at intersections. Hydnoceras fossils' entire surfaces are typically covered by coarse and fine rectangular patterns of narrow, threadlike ridges. The threadlike ridges are produced as a result of the way in which these sponges usually fossilized. Hydnoceras specimens fossilize as internal molds of the actual sponge's skeleton, and the rectangular latticelike ridges are an impression of the sponge's skeleton.[1]

Distribution

Fossils of Hydnoceras sponges have been found in rock formations in the United States, mainly in New York, Pennsylvania, and West Virginia.[1][2]

Ecology

Hydnoceras species were suspension feeders, and likely remained attached to a single substrate for their entire lives.[3] Unlike modern glass sponges, which typically live in deep marine environments, these sponges lived throughout the marine water column.[1]

References
  1. Thompson, Ida (2000). Field Guide to Fossils. Alfred A. Knopf. p. 344. ISBN 978-0-394-52412-2.
  2. "WVGES Museum Receives Loan of Glass Sponge Specimens". WV Geological & Economic Survey. West Virginia Geological & Economic Survey. Retrieved 3 December 2020.
  3. "Hydnoceras". Mindat. Hudson Institute of Mineralogy. Retrieved 3 December 2020.
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