Differential diagnosis:  Doryllium cornelli can be distinguished from D. minor by the distinctly sclerotized lining of the stoma and by the longer spear relative to the length of the spear extension.
Female (after van der Linde, 1938): Body slender, gradually tapering at both ends.  Cuticle striated.  Lip region offset:  three small, indistinct lips present.  Spear and spear extension about equal in lingth.  Lining of stoma distinctly sclerotized.  Esophageal bulb constricted, occupying about 25% of esophaugus.  Cardia rounded, small.  Vulva transverse; anterior gonad reduced to short uterine branch; posterior gonal normal, reflexed.  Tail hemispheroid; cuticle thickened at terminus.
Male not seen.

Discusssion: This species was originally described by van der Linde (1938) as Tylencholaimus cornelli.  Goodey (1951) transferred it to Tylencholaimellus  without comment, possibly interpreting the distinctly sclerotized lining of the vestibule (pharynx) mentioned by van der Linde (1938) to be the dorsal accessory piece of the spear.  Jairajpuri and Siddiqi (1963), disagreeing with Goodey's action, included the species in the genus Doryllium on the basis of the absence of the dorsal accessory piece both in van der Linde's (1938) illustration and his description.

Distribution and habitat:  Doryllium cornelli has been collected only from the type locality in Ithaca, New York, U.S.A.
(Description- Goseco, Ferris and Ferris, 1975)