ostiolar peritreme (ARTHRO: Insecta) The ridged, cuticular projections surrounding the ostiole, cresting and being subdivided into several smaller projections with ridges running parallel to the line from each ostiole to the corresponding evaporative cuticle.
ostiole, ostiola n. [L. ostiolum, little door] 1. Any small opening. 2. (ARTHRO: Insecta) In Heteroptera, one of paired dorsal abdominal scent gland openings; in adults, located near the coxa.
ostium n.; pl. ostia [L. ostium, door] 1. Any opening to a passage, usually associated with a valve or circular muscle. 2. (ARTHRO) The paired slitlike openings in the heart. 3. (ARTHRO: Insecta) In male Lepidoptera, the opening or area through which the internal pouch is everted during copulation. 4. (MOLL: Bivalvia) One of many tiny holes in the gill walls allowing currents of water through the gills. 5. (PO-RIF) Pore openings entering the interior cavity (the spongo-coel or atrium) of sponges; incurrent pores; inhalent pores. ostial a. see ostium bursae.
ostium bursae (ARTHRO: Insecta) The copulatory entrance of the bursa copulatrix in female Lepidoptera, corresponding to the vulva of other female insects with the genital opening on the 8th abdominal segment.
ostium oviductus (ARTHRO: Insecta) In female Lepidoptera, the primary opening of the genitalia through which the eggs are laid, situated near the 9th abdominal segment.
ostracum n. [Gr. ostrakon, shell] (MOLL: Bivalvia) 1. The entire calcareous part of the shell. 2. The outer part of the shell secreted at the mantle edge.
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