Dromiacea
| Dromiacea Temporal range:
| |
|---|---|
| File:Sponge crab eating a sea urchin.jpg | |
| Dromia dormia (Dromioidea: Dromiidae) feeding on a sea urchin | |
| Scientific classification Edit this classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Malacostraca |
| Order: | Decapoda |
| Suborder: | Pleocyemata |
| Infraorder: | Brachyura |
| Section: | Dromiacea De Haan, 1833 |
| Superfamilies | |
Dromiacea is a group of crabs, ranked as a section. It contains 240 extant and nearly 300 extinct species.[1] Dromiacea is the most basal grouping of Brachyura crabs, diverging the earliest in the evolutionary history, around the Late Triassic or Early Jurassic. Below is a cladogram showing Dromiacea's placement within Brachyura: [2] [3]
The larvae of Dromiacea resemble those of the Anomura more closely than those of other crabs.[citation needed] This may simply reflect their basal position in the crab phylogeny. The superfamily Eocarcinoidea, containing Eocarcinus and Platykotta, was previously considered to be a member of the Dromiacea, but has since been transferred to the Anomura.[4]
The fossil record of Dromiacea reaches back at least as far as the Jurassic,[5] and, if Imocaris is indeed a member, into the Carboniferous.[6]
Dromiacea primarily consists of two groups of superfamilies - Dromioidea and Homoloidea. See the below cladogram:[2]
| Dromiacea |
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Recent studies have found that some of the families may not be monophyletic, but rather paraphyletic.[2]
- The Dromioidea family Dromiidae may be paraphyletic with respect to Dynomenidae
- The Homoloidea family Homolidae is paraphyletic with respect to Latreilliidae
References
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