Callobius severus
Encyclopedia
Callobius severus is a species
of spider
. Individuals reach roughly 19 mm (3/4") in size, with males typically appearing smaller than females. Cephalothorax
and legs are reddish to dark brown and the abdomen
is dark to light grey with fine hairs, often appearing with large, bilaterally mirrored paler spots. Males feature large, extended palps with prominent projections.
It is a nesting woodland species commonly seen in the Pacific Northwest
, and one of the most commonly found and widespread spiders in populated areas of Washington state. It can often be found in households and other man-made structures with thin funnel webs, so long as the niche has not yet been filled by another organism. The species poses no threat to humans or pets, though like other Callobius
species, the bite is painful.
Species
In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...
of spider
Spider
Spiders are air-breathing arthropods that have eight legs, and chelicerae with fangs that inject venom. They are the largest order of arachnids and rank seventh in total species diversity among all other groups of organisms...
. Individuals reach roughly 19 mm (3/4") in size, with males typically appearing smaller than females. Cephalothorax
Cephalothorax
The cephalothorax is a tagma of various arthropods, comprising the head and the thorax fused together, as distinct from the abdomen behind. The word cephalothorax is derived from the Greek words for head and thorax...
and legs are reddish to dark brown and the abdomen
Abdomen
In vertebrates such as mammals the abdomen constitutes the part of the body between the thorax and pelvis. The region enclosed by the abdomen is termed the abdominal cavity...
is dark to light grey with fine hairs, often appearing with large, bilaterally mirrored paler spots. Males feature large, extended palps with prominent projections.
It is a nesting woodland species commonly seen in the Pacific Northwest
Pacific Northwest
The Pacific Northwest is a region in northwestern North America, bounded by the Pacific Ocean to the west and, loosely, by the Rocky Mountains on the east. Definitions of the region vary and there is no commonly agreed upon boundary, even among Pacific Northwesterners. A common concept of the...
, and one of the most commonly found and widespread spiders in populated areas of Washington state. It can often be found in households and other man-made structures with thin funnel webs, so long as the niche has not yet been filled by another organism. The species poses no threat to humans or pets, though like other Callobius
Callobius
Callobius is a spider genus in the family Amaurobiidae with 28 species that occur in North America and Eurasia.-Species:* Callobius angelus — USA* Callobius arizonicus — USA, Mexico...
species, the bite is painful.