Early Cambrian – Recent
Ostracoda is an extant order of epifaunal organisms with a variety of feeding habits.
Characteristics of the Class
- Laterally compressed crustacean with two valves.
- Generally calcified and hinged along dorsal side.
- 4 pairs of cephalic appendages and 1-3 pairs of thoracic appendages.
- Lack of abdominal appendages.
Treatise on Invertebrate Paleontology, Part Q, Arthropoda 3 (1961):
- Laterally compressed Crustacea with bivalve carapace, more or less calcified, and hinged along dorsal margin, enclosing bisegmented body with head undifferentiated, bearing 4 pairs of cephalic appendages, 1 to 3 pairs of thoracic appendages and a pair of furcal rami, but no abdominal appendages.