Definition
Sergiolus capulatus is a species of ground spider belonging to the family Gnaphosidae.
Overview
Described by the arachnologist Nathan Banks in 1909, Sergiolus capulatus is known from North America, with recorded occurrences in the United States and Canada. As a member of the Gnaphosidae, it is a nocturnal, free‑living hunter that does not build webs to capture prey. The species is typically found in leaf litter, under stones, and in other ground‑level microhabitats.
Etymology/Origin
The genus name Sergiolus is derived from Greek roots, though the precise intended meaning by the original describer is not widely documented. The specific epithet capulatus is Latin for “having a small head” or “head‑shaped,” likely referring to a morphological feature observed in the original description.
Characteristics
- Size: Small to medium for gnaphosid spiders, with body lengths generally ranging from 4 to 7 mm.
- Coloration: Typically brownish‑gray dorsally, with a lighter ventral surface; exact patterning may vary among individuals.
- Morphology: Like other Sergiolus species, it possesses a flattened body, elongated posterior spinnerets, and a distinctive arrangement of eyes in two rows. The male palpal organ and female epigyne exhibit diagnostic structures used for species identification.
- Behavior: Primarily a ground‑dwelling active hunter; nocturnal activity is common. It preys on small arthropods and does not employ silk for prey capture.
- Habitat: Found in a variety of temperate habitats, including forests, grasslands, and occasionally human‑altered environments such as gardens and basements.
Related Topics
- Gnaphosidae – the ground spider family to which Sergiolus capulatus belongs.
- Sergiolus – the genus comprising several North American species of ground spiders.
- Nathan Banks (entomologist) – the arachnologist who first described the species.
- Ground spider ecology – broader ecological role and behavior of non‑web‑building hunting spiders.
Note: Detailed morphological measurements, precise distribution maps, and comprehensive ecological studies are limited in the publicly available literature. Accurate information is not confirmed for aspects such as exact range limits and in‑depth life history traits.