Eryonidae is a
family
Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...
of
fossil
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserve ...
decapod
The Decapoda or decapods, from Ancient Greek δεκάς (''dekás''), meaning "ten", and πούς (''poús''), meaning "foot", is a large order of crustaceans within the class Malacostraca, and includes crabs, lobsters, crayfish, shrimp, and p ...
crustacean
Crustaceans (from Latin meaning: "those with shells" or "crusted ones") are invertebrate animals that constitute one group of arthropods that are traditionally a part of the subphylum Crustacea (), a large, diverse group of mainly aquatic arthrop ...
s which lived from the
Upper Triassic
The Late Triassic is the third and final epoch of the Triassic Period in the geologic time scale, spanning the time between Ma and Ma (million years ago). It is preceded by the Middle Triassic Epoch and followed by the Early Jurassic Epoch. T ...
to the
Lower Cretaceous
Lower may refer to:
* ''Lower'' (album), 2025 album by Benjamin Booker
* Lower (surname)
* Lower Township, New Jersey
*Lower Receiver (firearms)
* Lower Wick Gloucestershire, England
See also
* Nizhny
{{Disambiguation ...
. It contains four genera:
An aggregation of three unidentified eryonids was reported in 2012 inside a Late Jurassic
ammonoid of the species ''
Harpoceras falciferum''; they represent the earliest evidence of
gregarious behaviour
Sociality is the degree to which individuals in an animal population tend to associate in social groups (gregariousness) and form cooperative societies.
Sociality is a survival response to evolutionary pressures. For example, when a mother wasp ...
in decapods.
*''
Cycleryon''
Glaessner, 1965
*''
Eryon''
A. G. Desmarest, 1817
*''
Knebelia''
Van Straelen, 1922
*''
Rosenfeldia''
Garassino, Teruzzi & Dalla Vecchia, 1996
References
External links
*
Polychelida
{{paleo-crustacean-stub