Actinolaiminae. Anterior portion of esophagus a narrow
tube, definitely differing in structure from the muscular enlarged basal
portion. Lip region containing a cuticularized ribbed basket-like
structure with jagged processes surrounding the opening through which the
spear glides. Denticles may also be present in this cuticularized
ribbed structure. From this labial structure six cuticularized, rod-like
thickenings of the pharyngeal walls extend back to the simple spear guiding
ring. Ovaries double, reflexed. Spicula dorylaimoid with lateral
guiding pieces. Supplements consisting of an adanal pair and a ventromedian
series. Tails blunt, rounded in all known species.
Type species: Carcharolaimus
teres n. sp.
Diagnosis: Actinolaiminae with the above general description.
Differs from Actinolaimus in the absence of pharyngeal onchia and
in the weak structure of the anterior portion of the esophagus. Distinguished
from other Actinolaiminae by the form of the cuticularized structure
occupying the labial region.
(Description- Thorne, 1939)