- hookless
Male animals lack a copulatory hook.
- multiple hooks
Male animals exhibit multiple copulatory hooks. In wild type C. elegans males, a single hook is normally present.
- hook morphology variant
Any variation in the form or composition of the structure that lies on the ventral surface just anterior and central to the base of the spicule openings (small lump on the gubernaculum of the male tail) and contains a sensory structure called the hook sensillum, compared to control. In C. elegans the hook is necessary for proper male mating.
- hook development variant
Any variation in the development of the structure that lies on the ventral surface just anterior and central to the base of the spicule openings (small lump on the gubernaculum of the male tail) and contains a sensory structure called the hook sensillum, compared to control. In C. elegans the hook is necessary for proper male mating.
- approximate vulval location variant
Any variation in the mating process that includes the male stopping at the vulva (usually after backing) compared to control. In C. elegans general vulva location (stopping) requires the hook sensillum.
- axon termination defective
Axons in animals do not end in the same manner as they do in control animals. Some defects described include an overextension of the axon or termination of the axon in the shape of a hook, either large or small.
- male tail morphology variant
Animals exhibit variations in the structure or organization of the somatic reproductive components of the posterior segment of the male from that observed in control males. In C. elegans, this region of the male includes the terminal canals of the reproductive tract, the digestive tract, and spicule channels along with the male specific sensilla (ray, post-cloacal, hook and spicule) and extends to the tip of the acellular fan.