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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This species is distinguished by the constricted hemelytra; the thick patches of silvery and golden scalelike setae on the basal two thirds of the corium and clavus, intermixed with long, erect, bristlelike setae having a circular, seta-free patch at the base of each; and the male genitalia, especially the L-shaped right and left parameres and the distinct simple spiculum on the endosoma.
Endosoma coiled at middle, apical part somewhat roughened and broadened, not heavily sclerotized, with spiculum straight but hooked subapically.
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.
2008) pero tiene grandes diferencias en la complejidad de la capsula genital (edeago, saco interno, endofalo) y en la estructura del spiculum gastrale.
Ademas, las hembras de Augochlorini tienen una hendidura en el T5, los machos no tienen placa pigidial en el T7 y el S8 presenta spiculum, mientras que las hembras de Halictini tienen el T5 entero, los machos poseen una placa pigidial en el T7 bien definida y el S8 no tiene spiculum (Michener, 2007).