ULTRASTRUCTURE OF THE ORGAN OF BELLONCI IN THE HYPOGEAN ISOPOD STENASELLUS-VIREI-BOUI MAGNIEZ (CRUSTACEA, ASELLOTA)

Citation
A. Pitzalis et C. Juberthie, ULTRASTRUCTURE OF THE ORGAN OF BELLONCI IN THE HYPOGEAN ISOPOD STENASELLUS-VIREI-BOUI MAGNIEZ (CRUSTACEA, ASELLOTA), Canadian journal of zoology, 70(1), 1992, pp. 129-135
Citations number
40
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Zoology
Journal title
ISSN journal
0008-4301
Volume
70
Issue
1
Year of publication
1992
Pages
129 - 135
Database
ISI
SICI code
0008-4301(1992)70:1<129:UOTOOB>2.0.ZU;2-H
Abstract
The ultrastructure of the organ of Bellonci in the hypogean isopod Ste nasellus virei boui was investigated. There are two organs located ant erodorsally, one on each side of the cephalon. Each organ consists of a wall surrounding a cavity with a central core irregular in shape. Th e bordering wall contains some glial cells and the inner dendritic seg ments of 25-28 sensory cells, each one bearing two cilia. Each cilium has a typical 9 + 0 axoneme, a basal body, and a long straight ciliary root that is at a right angle to the basal body; the cilium branches out into tubules that usually contain 1 microtubule, occasionally 2 or more. The ciliary tubules are gathered in three or four long bundles and are not linked to the core. The ciliary connections appear to be b oth conical and cylindrical. The ultrastructural morphology (polarizat ion of the cilia, spatial arrangement of the bundles and central core) suggests that this organ can record directional stimuli,