wolga spinifera wolga spinifera wolga is a monotypic genus of rotifers belonging to the family trichotriidae. the only species is wolga spinifera. wolga spinifera scientific classification kingdom: animalia phylum: rotifera class: monogononta order: ploima family: trichotriidae genus: wolgaskorikov, 1903 species: w. spinifera binomial name wolga spinifera(western, 1894) synonyms species synonymy distyla spinifera western, 1894 the species is found in europe.