copulatory spicule

copulatory spicule

[′käp·yə·lə‚tȯr·ē ′spik·yəl]
(invertebrate zoology)
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The copulatory spicule was described by Zunino (1972) as "spicola copulatrice" for the genus Euonthophagus Balthasar.
Small, length <5 mm, greatest height anterior and at posteroventral lobe; scleritome rough but glistening; epidermal sclerites rimmed, sharply pointed scales, flattened rods longer and thicker than scales, and a few rimmed, trowel-like sclerites with a short stem; copulatory spicule single, with a short sheath; glandular copulatory sac voluminous, filling the posteroventral body lobe; paired seminal vesicles each with two unusually large lobes and common duct; without seminal receptacles; lower gametoducts narrow, fused in distalmost portion and opening into mantle cavity.
Mantle cavity with scattered glands above epidermis; small, shallow, crowded by posteroventral body lobe containing copulatory spicule and sac.
The mantle cavity contains one or two gametopores, the anus, openings of the copulatory spicule sacs, and usually respiratory folds or papillae.
Identifications were based on the dimensions of the hooks and copulatory spicules of the males that were measured using a microscope equipped with an ocular micrometer.
Helicoradomenia is defined by its radula, type of ventrolateral salivary glands, body shape, types of sclerites, and presence of paired copulatory spicules.