spiculum


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Related to spiculum: speculum

spiculum

[′spik·yə·ləm]
(invertebrate zoology)
A bristlelike copulatory organ in certain nematodes. Also known as copulatory spicule.
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DIAGNOSIS: Recognized by the ovoid and comparatively tumid body, light castaneous general coloration, obscure spots on the apical part of the corium and the membrane, usually darkened basal part of the metafemur, generally chocolate brown abdomen, distinct blade and weakly curved spiculum of the endosoma, and somewhat narrowed sclerotized rings.
Endosoma not much coiled, with a distinct apical blade and weakly curved spiculum.
nov.: (20) dorsal view; (21) ventral view; (22) lateral view; (23) ventrite 1; (24) male tergite VII (TVII), TBC: tubercle; (25) male tergite VIII (TVIII); (26) aedeagus, lateral view; (27) aedeagus, dorsal view, PH: phallobase, ML: median lobe, END: endophallus, ADA: aedeagal apodeme; (28 and 29) enlarged structures of endophallus; (30) spiculum gastrale, LA: lateral arm, MA: median arm.
5) composed of a dorsal and ventral portions, base of spiculum weakly sclerotized; dorsal portion of spicule shorter than ventral, from about one half to three-fourths the length of ventral portion, apex sclerotized, either straight or curved to the left in dorsal view, dorsal area weakly sclerotized; ventral portion of spicule with apex reaching or not apex of phallotheca, apex of ventral portion acute or expanded; sclerotized part of ductus seminis short, forming a single sclerotized unit, about half the length of dorsal portion of spicule and located close to its apex; when everted, spicule and sclerotized part of ductus seminis maintain relative position as in non-everted aedeagus (Fig.
(2008) pero tiene grandes diferencias en la complejidad de la capsula genital (edeago, saco interno, endofalo) y en la estructura del spiculum gastrale.