Phylum: Arthropoda
Class: Ostracoda
Order: Palaeocopida
Family: Drepanellidae (Ulrich & Bassler, 1923)
Cincinnatian Genus: Drepanella

Geologic Range
Middle Ordovician – Late Devonian

Common Paleoecology
Drepanellidae is an extinct family of epifaunal suspension feeders.

Description of the Family

  • Subquadrate to subrectangular.
  • Well defined cardinal angles.
  • Lateral surface lobate or with nodose lobes.
  • Frequently has spines.
  • Surface smooth granular, pitted or finely reticulate.
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Treatise on Invertebrate Paleontology, Part Q, Arthropoda 3 (1961):

  • Carapace subquadrate to subrectangular; hinge long, dorsum straight, cardinal angles subequal and well defined; lateral surface lobate or with nodose lobes, nodes commonly terminating as spines with one or more overreaching dorsum; surface smooth granular, pitted, or finely reticulate; marginal ridge or carina subparallel to free margin, poorly developed posteriorly; valves subequal. Hingement by simple tongue and groove but unknown in some forms. Dimorphism unknown.

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