Coras is a genus

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 spiders in the family Amaurobiidae with 15 described species that occur in eastern North America

North America

North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...

 from Nova Scotia

Nova Scotia

Nova Scotia is one of Canada's three Maritime provinces and is the most populous province in Atlantic Canada. The name of the province is Latin for "New Scotland," but "Nova Scotia" is the recognized, English-language name of the province. The provincial capital is Halifax. Nova Scotia is the...

 south to Florida

Florida

Florida is a state in the southeastern United States, located on the nation's Atlantic and Gulf coasts. It is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia and to the east by the Atlantic Ocean. With a population of 18,801,310 as measured by the 2010 census, it...

. They can be readily distinguished from other genera in the subfamily by the large anterior median eyes being larger than the anterior lateral eyes, whereas in other genera the reverse is true, along with a number of more technical reproductive features. The type species

Type species

In biological nomenclature, a type species is both a concept and a practical system which is used in the classification and nomenclature of animals and plants. The value of a "type species" lies in the fact that it makes clear what is meant by a particular genus name. A type species is the species...

 is Coras medicinalis.

Species

• Coras aerialis Muma, 1946 — USA
• Coras alabama Muma, 1946 — USA
• Coras angularis Muma, 1944 — USA
• Coras cavernorum Barrows, 1940 — USA
• Coras crescentis Muma, 1944 — USA
• Coras furcatus Muma, 1946 — USA
• Coras juvenilis (Keyserling, 1881) — USA
• Coras kisatchie Muma, 1946 — USA
• Coras lamellosus (Keyserling, 1887) — USA
• Coras medicinalis (Hentz, 1821) — USA, Canada
• Coras montanus (Emerton, 1890) — USA, Canada
• Coras parallelis Muma, 1944 — USA
• Coras perplexus Muma, 1946 — USA
• Coras taugynus Chamberlin, 1925 — USA
• Coras tennesseensis Muma, 1946 — USA