shell coiling 예문

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1. Note that Pilsbry described the shell as if it were dextral, whereas planorbids are now known to be sinistral in shell coiling.
2. Like other vermetids, the species in this genus do not have regular shell coiling like that of a typical gastropod shell, instead they have shells which are irregular.
3. Although it is now understood that these species are sinistral in shell coiling, disk-like Planorbid shells are often still shown in illustrations oriented as if they were dextral.
4. The rest of the species in the genus are right-handed or " dextral " in the shell coiling, as is usually the case in the great majority of gastropods.
5. This globular shape, tight shell coiling, strong sculpture, a dentate outer lip and narrow aperture offers an added protection against shell-crushing predators, such as fishes and crabs.