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A new genus and species, Aphanonchus inlermedius, is described from Lake Tahoe, California. It is characterized by a finely annulated cuticle with narrow lateral field, soft cephalic setae, unispiral to irregularly circular amphids which occupy about 1/2 of the corresponding head width, stoma consisting of a narrow anterior and a wide, sclerotized posterior part. Lateral epidermal glands and pores prominent. Ventral gland lobed and associated with coelomocytes, excretory duct cuticularized opening anterior to mouth opening. Female reproductive system amphidelph, vagina with prominent sclerotization. Male with a series of tuboid supplements and a medioventral row of numerous alveoli extending to the anterior end. The new genus is intermediate between Paraphanolaimus and Anonchus. Paraphanolaimus mullipapillatus (Daday, 1905) is transferred to the new genus. The morphology of the head end and of the vaginal musculature is described in detail.

Three new species of Paraphanolaimus Micoletzky, 1922 are described, one from southern Chile, P. terrestris sp. n., is characterized by length of female, number of smooth, coarse annuli, conoid tail with tubular posterior portion, long neck region (b = < 4.5). P. latescens sp. n. from Lizard Island, Great Barrier Reef, Australia is distinguished by length of females and males, shape of tail, size of spicules and number of lateral epidermal glands (LEG). P. tahoensis sp. n. from Lake Tahoe, California, is distinguished by length of females and males, number of annuli, number and size of pairs of prominent LEGs, large oval amphids, rounded lips of vulva, perpendicular vagina, number of supplements, and size and shape of spicules and gubernaculum. Specimens of P. anisitsi Daday, 1905 from southern Chile and from the Mendocino coast of California provide further information on that species. P. micoletzkyi Khera & Chaturvedi, 1977, was described from a single female and distinguished by a set-off posterior bulb in the pharynx immediately behind the nerve ring. This character makes doubtful its placement in the genus Paraphanolaimus and the species is assigned to species inquirendae.