Additions to the millipede family Caseyidae Verhoeff, 1909. III. Proposal of the new subfamily Ochrogrammatinae, new records of Vasingtona irritans (Chamberlin, 1910), established species of Ochrogramma Gardener and Shelley, 1989, a new species of Ochrogramma from Washington state, USA (Diplopoda, Chordeumatida, Striariidea), and observations on spermatozoa and spermatophores

Abstract

The genera Ochrogramma Gardner and Shelley, 1989 and Vasingtona Chamberlin, 1941 (Diplopoda: Chordeumatida: Striariidea: Caseyidae) are assigned to the Ochrogrammatinae Shear and Marek, new subfamily. The new subfamily is diagnosed by the broad ventral lamina of the mandibular stipes and extremely long gonapophyses (found in males), the peculiar, elaborately branched processes of the gonopods, and other characters. New records and new SEM illustrations are provided for the species Vasingtona irritans (Chamberlin, 1910), Ochrogramma bentona (Chamberlin, 1952) and Ochrogramma haigi Gardner and Shelley, 1989. The range of O. bentona is extended north from the Columbia River to the Puget Sound region. We describe Ochrogramma skamania Shear and Marek, new species, which is the second species of its genus from north of the Columbia River. We also document for the first time spermatophore material on the coxae of legpair 10, the gonopods and the female vulvae, and thus provide evidence that a spermatophore is formed in the coxal glands of legpair 10, picked up by the gonopods and thence transferred to the female receptacles. The spermatozoa of Nematophora, heretofore undescribed, appear to be subglobular, about 14.0–14.5 μm in diameter, nonmotile and embedded in a secretion.