Pseudosiobla campbelli

The species is known from only the holotype, a single, mostly complete adult female, now deposited in the Geological Survey of Canada collections as specimen number "GSC No. 22689". The shale specimen is from deposits of the "Horsefly shale" along the Horsefly River in the Cariboo District of British Columbia, Canada. The holotype was first studied by Harington Rice of the Geological Survey of Canada. Rice published his 1968 type description for P. campbelli in the Geological Survey of Canada professional paper number 67-59. The specific name campbelli was coined in honor of R. B. Campbell who collected the holotype specimen in 1959. Pseudosiobla campbelli is the smallest species of Pseudosiobla to be described from the fossil record. The single known female possesses a head, thorax and posterior segments of the abdomen which are dark brown to black. The central segments of the abdomen appear to have been pale colored. The wings are hyaline with very dark veins and short, stout hairs across the wing membrane. While the specimen is missing portions of her legs and antennae, her ovipositor is visible and well preserved. P. campbelli is distinguished from members of the related genus Eriocampa in general and E. tulameenensis found in the related lake deposits in Princeton, B.C. by several features: P. …