Litoricola dentata

Litoricola dentata

Woodward, 1873

Common name Deep-sea Crab
Fossil group Crustaceans
Order Decapoda
Family Geryonidae
Genus Litoricola
Taxonomic status Accepted
Geological age Ypresian

Summary

Litoricola dentata was a broad true crab belonging to a lineage whose living relatives include deep-water geryonid crabs. It probably lived on the seabed as an active omnivore or predator, using its claws to handle small animals and scavenged food.

Its presence adds another ecological type to the already diverse London Clay crab fauna. Rather than all crabs occupying the same niche, the formation preserves compact bottom walkers, swimming forms, burrowers, sponge carriers and other specialised groups.

Quick Identification

Look for: a broad, fairly flat inverted-subtrapezoidal carapace with a bifid bilobed front, broad orbits with two open fissures and distinctly toothed side margins.

Diagnostic Features

  • Carapace broader than long and approximately inverted-subtrapezoidal.
  • Maximum carapace width lies in the anterior third.
  • Front is bilobed, with each lobe bifid to produce a four-lobed appearance.
  • Orbits are broad and show two distinct open fissures.
  • Lateral margins are distinctly toothed and help separate Litoricola from smoother geryonid-like crabs.

Fossil Details

Typical size
Several centimetres across.
Fossil material
Carapace, Claw / Chela
Preservation
Frontal lobes, orbital margins and lateral teeth are easily broken. A central carapace lacking these margins may be difficult to identify securely, even if the dorsal regions are preserved.

Similar Species

Recorded Fossil Sites

London Clay Formation

Thames Group
Historical

Synonyms & Previous Names

Litoricola glabra; Coeloma dentatum; Coeloma glabra

References

  • J. S. H. Collins; C. J. T. Mellish; A. J. Ross; P. R. Crabb; S. K. Donovan. (2020). A guide to the fossil Decapoda (Crustacea: Axiidea, Anomura, Brachyura) of the British Isles. Proceedings of the Geologists' Association, 131(1), 19–50 View reference
Last Reviewed
16 August 2026 Reviewed by Sam Harris