Information om | Engelska ordet APERTURAL

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• The siphonal canal is long and curved, and the apertural lip is adorned with circumapertural projections, which are fingerlike processes emanating from the edge of the shell aperture.
• It is brown, irregularly striated (surface ornamented with strong spiral striae which cross-cut the radial growth striae – this can lead to the development of quadrate plates) and the apertural height is about 50% of the shell height.
• The apertural barriers consist of three parietals, a single columellar one that slants downwards, and three long palatals.
• Various pupillid genera also, such as Orcula (Orculidae) and Lauria (Lauriidae), have apertural armature during the neanic stage.
• Gulella systemanaturae is characterized by a medium-sized shell with little prominent costulation, seven to seven and three-quarter whorls and fourfold apertural dentition consisting of angular lamella, labral process, and outer and inner columellar processes; labrum sharply angulate at its point of attachment to the body whorl near the angular lamella.
• Diagnosis: Initial teleoconch whorls with lengthened white papillae, without regular riblets; parietal side of the apertural border not protruding; lamella parietalis short; lamella columellaris (very) low; lunella rather prominent.
• The Ostryopsis–Carpinus–Ostrya subclade is defined by staminate flowers without a perianth, operculate pollen apertures with endexine not thickening at apertural region, a base chromosome number of 8, and a plicate leaf vernation pattern.
• 75 whorls, has flocculent sculpture with fine spiral lines, the apertural varix is not connected to embryonic cap, apertural margin is sinusoid.
• The apertural face may be imperforate; the aperture interiomarginal and extraumbilical-umbilical to nearly equatorial in coiled forms, subterminal in uncoiled forms.

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