Actumnus
Encyclopedia
Actumnus is an genus
of crab
s in the family
Pilumnidae. Alongside the 28 extant species, it has a fossil record extending back into the Miocene
.
Two further species are known only from fossil
s.
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...
of crab
Crab
True crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" , or where the reduced abdomen is entirely hidden under the thorax...
s in the family
Family (biology)
In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...
Pilumnidae. Alongside the 28 extant species, it has a fossil record extending back into the Miocene
Miocene
The Miocene is a geological epoch of the Neogene Period and extends from about . The Miocene was named by Sir Charles Lyell. Its name comes from the Greek words and and means "less recent" because it has 18% fewer modern sea invertebrates than the Pliocene. The Miocene follows the Oligocene...
.
Species
Actumnus contains 28 extant species:- Actumnus amirantensis Rathbun, 1911
- Actumnus anthelmei Ward, 1942
- Actumnus arbutum Alcock, 1898
- Actumnus asper (Rüppell, 1830)
- Actumnus calypso (Herbst, 1801)
- Actumnus davoensis Ward, 1941
- Actumnus digitalis (Rathbun, 1907)
- Actumnus dorsipes (Stimpson, 1858)
- Actumnus elegans De Man, 1888
- Actumnus fissifrons Alcock, 1898
- Actumnus forficigerus (Stimpson, 1858)
- Actumnus globulus Heller, 1891
- Actumnus granotuberosus Garth & Kim, 1983
- Actumnus griffini Takeda & Webber, 2006
- Actumnus intermedius Balss, 1922
- Actumnus margarodes MacGilchrist, 1905
- Actumnus marissinicus Takeda & Miyake, 1977
- Actumnus miliaris A. Milne-Edwards, 1865
- Actumnus obesus Dana, 1852
- Actumnus parvulus A. Milne-Edwards, 1865
- Actumnus setifer (De Haan, 1835)
- Actumnus setosiareolatus Takeda, 1977
- Actumnus similis Takeda & Miyake, 1969
- Actumnus simplex Rathbun, 1911
- Actumnus squamosus (De Haan, 1835)
- Actumnus taiwanicus Ho, Yu & Ng, 2001
- Actumnus targionii Cano, 1889
- Actumnus tesselatus Alcock, 1898
Two further species are known only from fossil
Fossil
Fossils are the preserved remains or traces of animals , plants, and other organisms from the remote past...
s.