The spider family Corinnidae (antmimic spiders) includes around 1083 species (Platnick 2013). In North America north of Mexico there are around 127 species, including several introduced species, with most of the diversity found in the southern portion of this region (Ubick and Richman 2005; Bradley 2013). Corinnids are generally ground dwellers and are commonly found beneath rocks and in leaf litter. Members of the genus Trachelas also occur on foliage and some species frequently enter houses, where they may be of minor medical concern (Platnick and Shadab 1974). The convergent cone-shaped spinnerets of corinnids distinguish them from ground spiders of the family Gnaphosidae, which have conspicuous cylindrical spinnerets that are often visible from above. Like most spiders, corinnids have eight eyes.
Although often brown, some corinnids are colorful. Ant mimicry is common in this family (and at least some species seem to be closely associated with ants) and some species are believed to be mimics of mutillid wasps. Although most corinnids are nocturnal, the ant mimics (as would be expected) tend to be diurnal. As is common for the families of two-clawed hunting spiders (dionychans), corinnids build sac-like retreats, often under rocks or other debris on the ground. The egg sacs, which are typically flat discs, may be deposited in the retreats or attached to the substrate (Comstock  includes a photograph of egg cases of Castianeira descripta on the underside of a stone). Historically, corinnids were included in a family Clubionidae that was defined far more broadly than it is today.
(Ubick and Richman 2005; Bradley 2013)
- Bradley, R.A. 2013. Common Spiders of North America. University of California Press, Berkeley.
- Comstock, J.H. 1912. (Revised and edited by W.J. Gertsch 1940; reissued 1948 ). The Spider Book. Comstock Publishing Company, Ithaca, NY.
- Platnick, N. I. 2013. The world spider catalog, version 14.0. American Museum of Natural History, online at http://research.amnh.org/entomology/spiders/catalog/index.html
- Platnick, N.I. and M.U. Shadab. 1974. A revision of the tranquillus and speciosus groups of the spider genus Trachelas (Araneae, Clubionidae) in North and Central America. American Museum Novitates No. 2553: 1-34.
- Ubick, D. and D.B. Richman. 2005. Corinnidae. Pp. 79-82 in D. Ubick, P. Paquin, P.E. Cushing, and V. Roth (eds.) Spiders of North America: an Identification Manual. American Arachnological Society.
Molecular Biology and Genetics
Statistics of barcoding coverage
|Specimen Records:||685||Public Records:||113|
|Specimens with Sequences:||577||Public Species:||11|
|Specimens with Barcodes:||532||Public BINs:||12|
|Species With Barcodes:||96|
Corinnid sac spider
The corinnid sac spiders (family Corinnidae), like the other clubionoid families, have a very confusing taxonomic history. Once this family was a part of the large catch-all taxon Clubionidae, now a shadow of its former self. The clubionoids are apparently similar only in that they have eight eyes arranged in two rows, conical anterior spinnerets that touch and are generally wandering predators that build silken retreats, or sacs, usually on plant terminals, between leaves, under bark or under rocks.
Among the families formerly classified as "Clubionidae", some of which have common names including the words "sac spider", include:
- Anyphaenidae (anyphaenid sac spider)
- Tengellidae (tengellid spider)
- Zorocratidae (zorocratid spider)
- Miturgidae (long-legged sac spider)
- Corinnidae (corinnid sac spider)
- Liocranidae (liocranid sac spider)
- Clubionidae (sac spiders)
The Corinnidae, as now recognized, contains 75 genera and over 900 species worldwide, making it the largest of the "clubionoid" families. Among the common genera are Castianeira (nearly world wide), Corinna (widespread), Meriola (New World), Phrurolithus (widespread), Phrurotimpus (North America) and Trachelas (widespread).
Members of the genus Castianeira appear to be mimics of ants and velvet ants. Other corinnid ant-like genera include Mazax, Myrmecium and Myrmecotypus. The "phurolithines" (including Phrurolithus and Phrurotimpus) are tiny spiders often found in leaf litter that have many ventral spines on their first tibiae. The 'trachelines" (Meriola and Trachelas) are usually bicolored spiders with red-brown cephalothoraxes (carapaces) and dirty grey to yellowish abdomens. Corinna is the type genus for the family and consists of small running spiders.
The categorization into subfamilies follows Joel Hallan.
- Aetius O. P.-Cambridge, 1896
- Apochinomma Pavesi, 1881
- Cambalida Simon, 1910
- Castanilla Caporiacco, 1936
- Castianeira Keyserling, 1879
- Castoponera Deeleman-Reinhold, 2001
- Coenoptychus Simon, 1885
- Copa Simon, 1885
- Corinnomma Karsch, 1880
- Echinax Deeleman-Reinhold, 2001
- Graptartia Simon, 1896
- Humua Ono, 1987
- Mazax O. P.-Cambridge, 1898
- Medmassa Simon, 1887
- Merenius Simon, 1910
- Messapus Simon, 1898
- Myrmecium Latreille, 1824
- Myrmecotypus O. P.-Cambridge, 1894
- Poecilipta Simon, 1896
- Pranburia Deeleman-Reinhold, 1993
- Psellocoptus Simon, 1896
- Serendib Deeleman-Reinhold, 2001
- Sphecotypus O. P.-Cambridge, 1895
- Supunna Simon, 1897
- Abapeba Bonaldo, 2000
- Attacobius Mello-Leitão, 1925
- Austrophaea Lawrence, 1952
- Corinna C. L. Koch, 1841
- Creugas Thorell, 1878
- Ecitocobius Bonaldo & Brescovit, 1998
- Erendira Bonaldo, 2000
- Falconina Brignoli, 1985
- Lessertina Lawrence, 1942
- Mandaneta Strand, 1932
- Megalostrata Karsch, 1880
- Methesis Simon, 1896
- Oedignatha Thorell, 1881
- Parachemmis Chickering, 1937
- Paradiestus Mello-Leitão, 1915
- Procopius Thorell, 1899
- Pseudocorinna Simon, 1910
- Septentrinna Bonaldo, 2000
- Simonestus Bonaldo, 2000
- Stethorrhagus Simon, 1896
- Tapixaua Bonaldo, 2000
- Tupirinna Bonaldo, 2000
- Xeropigo O. P.-Cambridge, 1882
- incertae sedis