selenizone वाक्य
उदाहरण वाक्य
मोबाइल
- The selenizone has 4 to 5 spiral cords and is usually concave in profile.
- Occasionally the selenizone has thin orange lines.
- The selenizone has no distinct spiral sculpture however it has numerous fine curved growth striae.
- These holes collectively make up what is known as the selenizone which form as the shell grows.
- It has also been suggested that the selenizone may serve to reinforce the shell against catastrophic breakage during predation attempts.
- A new shell-morphological term'sutsel'has been introduced by Dr . Geiger for the area between the SUTure and the SELenizone.
- Each abalone species has a typical number of holes in the selenizone which remain open, and this feature is diagnostic for the individual species.
- "Euomphalus " is characterized by a closely coiled shell with a depressed to slightly elevated spire and a channel-bearing angulation ( a selenizone ) on the upper surface of the whorls.
- In the Haliotidae, the abalones, the selenizone takes the form of a series of holes in the shell ( reaching back from the leading growth edge of the aperture ) which form as the shell grows.
- Coiling is dextral, although it appears sinistral, deduced from the position of the channel ( presumed to be exhalent ) contained in a ridge or keel ( a selenizone on what is assumed to be the upper side.
- The shell is creamy yellow overlaid with many crimson axial flammules above and below the selenizone which has yellowish orange crescent shaped growth marks, the base is a pale creamy yellow with occasional light crimson flammules, and the interior of the aperture is nacreous.
- The shell is heavily textured with about 20 to 22 coarse spiral cords crossed by numerous heavy axial growth lines to produce rows of prominent beads over the entire surface above the selenizone ( the area where the shell growth filled in the slit ) and about 7 to 8 rows of prominent beads below.
- The Anomphalidae differ from the Euomphalcea to which they have been reassigned in being more trochoidal, in lacking the angulation on the upper whorl surface characteristic of Euomphalacea, and in having the inner shell layer seemingly nacreous . ( The inner shell layers of the Euomphalacea may be of laminar arragonite, but are never nacreous . ) The Anomphalidea differ from the Pleurotomariacea in lacking the often deep slit or selenizone, which is characteristic of that taxon.
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