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Genus Sergiolus

Sergiolus montanus - female Ground spider - Sergiolus capulatus - male Gnaphosidae? - Sergiolus Adult female - Sergiolus montanus - female Unknown spider - Sergiolus Spider - Sergiolus montanus - female Sergiolus capulatus Spider - Sergiolus capulatus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Chelicerata (Chelicerates)
Class Arachnida (Arachnids)
Order Araneae (Spiders)
Infraorder Araneomorphae (True Spiders)
No Taxon (Entelegynae)
Family Gnaphosidae (Ground Spiders)
Genus Sergiolus
16 species in bugguide's range
3.3 to 9 mm
Based on Platnick & Shadab 1981 see the following patterns, but keep in mind pattern seems to vary quite a bit in each species:

S. angustus (two white stripes running down abdomen & meeting both anteriorly & posteriorly, carapace dark)

S. bicolor (no posterior white band)

S. capulatus (3 white transverse band, and T mark and dark posterior declivity of the carapace)

S. columbianus (very similar to montanus, anterior white band straight across not widening at sides)

S. cyaneiventris - (no anterior white band, two lateral anterior marks, two anterior white circles, one mid-dorsal unbroken white band, spotted venter)

S. decoratus - (4 white dorsal bands, anterior & 1st mid-dorsal white band meet at sides, then posterior & 2nd mid-dorsal band meet at sides also)

S. gertschi - (anterior, mid-dorsal & posterior white marks & T mark, but marks more uneven than other species & T meets anterior mark)

S. iviei - (anterior white mark shaped like "n", two white spots in mid-dorsal area, posterior white band, carapace light, very similar to montanus)

S. kastoni - just FL (anterior & mid-dorsal white bands with T mark, no posterior white mark)

S. lowelli - (anterior & mid-dorsal white bands)

S. minutus - (3 transverse white bands, anterior band wider at sides; mid-dorsal band and posterior band joining at sides, no mention of that golden coloring seen in second image which is Callilepis

S. montanus - (very similar to columbianus and the drawings in the reference show the anterior transverse band broken, but images in the guide don't match that)

S. ocellatus - (three transverse white bands and two (or 4) white spots between anterior & mid-dorsal bands)

S. stella - (white mid-dorsal mark joins large anterior white mark in the middle of the abdomen)

S. tennesseensis - (wide abdomen three white transverse bands, anterior & dorsal bands wide)

- pattern matches only - not sure on coloring
S. unimaculatus - (light colored?, two white mid-dorsal marks.. abdomen long & thin)
Species in bugguide's range

S. angustus - Soutwestern USA CA to TX
S. bicolor - Texas east to FL, north to New York, Southeastern Canada (above ND)?
S. capulatus - Eastern USA & Southeastern Canada
S. columbianus - Western USA & Southwestern Canada
S. cyaneiventris - Southeastern USA
S. decoratus - Northeastern USA & Southeastern Canada
S. gertschi - just southern CA
S. iviei - Western USA & Southwestern Canada
S. kastoni - just FL
S. lowelli - TX, UT, AZ, OK
S. minutus - Eastern USA (along the coast in the north, widespread in the south)
S. montanus - Widespread in the West, more sporadic in the Eastern USA. Also in Canada
S. ocellatus - Eastern USA (to ND) & Southeastern Canada
S. stella - Arizona to TX & south into Mexico.
S. tennesseensis - ND & CO east to Virginia
S. unimaculatus - Eastern USA (coastal?) & Southeastern Canada
".. all the species of Sergiolus are united by the presence of a fundamentally transverse abdominal color pattern (as in figs.1-4) that is highly unusual among gnaphosids.." (1)
Works Cited
1.A Revision of the Spider Genus Sergiolus
Platnick, Norman I.; Shadab, Mohammad U. 1981. Am. Mus. Novit. 2717: 1-48.