Search results
Results from the WOW.Com Content Network
Raninoida is a taxonomic section of the crabs, containing a single superfamily, Raninoidea. This group of crabs is unlike most, with the abdomen not being folded under the thorax . It comprises 46 extant species, and nearly 200 species known only from fossils .
Raninidae is a family of unusual crabs, sometimes known as "frog crabs", on account of their frog-like appearance.They are taken by most scientists to be quite primitive among the true crabs.
The group consisting of Raninoida and Cyclodorippoida split off next, during the Jurassic period. The remaining clade Eubrachyura then divided during the Cretaceous period into Heterotremata and Thoracotremata. A summary of the high-level internal relationships within Brachyura can be shown in the cladogram below: [44] [43]
Raninoida-stub; Stub; About this template. This template is used to identify a Brachyura stub. It uses {}, which is a meta-template designed to ease the process of ...
The Grapsoidea are a superfamily of crabs; they are well known and contain many taxa which are terrestrial (land-living), semiterrestrial (taking to the sea only for reproduction), or limnic (living in fresh water).
Pilumnoidea is a superfamily of crabs, [1] [2] whose members were previously included in the Xanthoidea. [3] The three families are unified by the free articulation of all the segments of the male crab's abdomen and by the form of the gonopods. [2]
The definition of a scientific fact is different from the definition of fact, as it implies knowledge. A scientific fact is the result of a repeatable careful observation or measurement by experimentation or other means, also called empirical evidence. These are central to building scientific theories.
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.