pygidium


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pygidium

[pī′jid·ē·əm]
(invertebrate zoology)
A caudal shield on the abdomen of some Arthropoda.
The terminal body segment of many invertebrates.
References in periodicals archive ?
One incomplete cephalon from sample Gh-7A/30-32 m; one enrolled exoskeleton (GUGM 1361) from sample Gh-7B/5-12 m and one pygidium (GUGM 1369) from sample Gh-7B/23-30 m.
a) Mid-posterior chaetigers, showing branched branchiae, b) distal end, dorsal view, c) distal end with pygidium in ventrolateral view.
The flagellum with 4 flagellomeres, 5-jointed tarsi, antennae inserted near the middle of the rostrum, and pygidium exposed indicate placement in the tribe Dryophthorini.
Body is long, ranging from 60 mm to 64 mm (55-58 segments), gradually tapering towards the pygidium. The prostomium is blunt, conical, the length being slightly longer than width and has no eyes and appendages.
Tiene poros perivulvares y el pygidium es amplio, subtendido por un angulo superior a 90[grados], con tres pares de lobulos redondeados y el borde (entre los segmentos VI y VII) con numerosos macroconductos ordenados en doble o triple hilera.
The correlations analysis of Spearman's shows that rainfall acts negatively on reproductive activity (P = 0,0132, Ratio= -0,68) by preventing the theft of the adult males on lemon-tree, (P = 0,060, Ratio= -0,55) for the sliding of the females towards the party inferior of the buckler, to display their pygidium to the coupling on the orange-tree.
Male can be recognised from female by its antenna which is more serrate and last segment of pygidium. The pygidium of the male appears straight downwards from above.
The shell-boring polychaete species were identified on the basis of fifth setiger chaetae, prostomium and pygidium morphology, and branchiae distribution.