Conifer-bark
Guides
Marchena
Marchena is a monotypic genus of jumping spiders endemic to the western United States. Its sole described species, M. minuta, inhabits conifer bark habitats along the Pacific coast. The genus is the only North American representative of the subfamily Heliophaninae. Marchena forms a monophyletic group with the genera Afraflacilla, Pseudicius, and Festucula.
Marchena minuta
Marchena minuta is a small jumping spider and the sole described species in its genus. It is endemic to western North America, where it inhabits the bark of coniferous trees. The species represents the only North American member of the subfamily Heliophaninae. Its distribution is concentrated along the Pacific coast, with records from California, Washington, and Nevada.
Olisthaerinae
Olisthaerinae is a small subfamily of rove beetles (Staphylinidae) characterized by a 5-5-5 tarsal formula and morphological similarity to Phloeocharinae. The group is primarily associated with dead conifer bark habitats. Only two species are documented in North America: Olisthaerus megacephalus and O. substriatus, with a range extending from Alaska across Canada to New York. The biology of this subfamily remains poorly understood.