shell aperture造句
例句與造句
- The shell aperture is semilunar and a little oblique.
- The shell aperture is subhorizontal, semicircular, obstructed by 5 or 6 teeth.
- The shell aperture is normally oval, and often tangential to the coiling axis.
- The shell aperture is ovate, and is a fleshy-brown color inside.
- The shell as a whole has seven slightly convex operculum partially covers the shell aperture.
- It's difficult to find shell aperture in a sentence. 用shell aperture造句挺難的
- Adults are about 70 mm in length with an diameter of about 11 mm at the shell aperture.
- Many families have opercula that are reduced in size, and which are not capable of closing the shell aperture.
- There is a calcified layer over the lower half of the shell aperture which is formed by the inner lip.
- They hold small snails with the shells aperture-upward with the front of its foot and eat their way down.
- The shell aperture follows the slope of the spire, is semicircular, and is contracted by six strong, curved lamellae.
- The shell aperture is located on the right side, i . e . the shell of this species is almost always dextral in coiling.
- Also unique to the operculum is that when the animal retracts into its shell, only about one-half of the operculum covers the shell aperture.
- This ecotype shows a smaller and thinner shell with a wider shell aperture to allocate a relatively larger muscular foot providing a higher ability to avoid the dislodgment caused by the heavy wave action.
- It is very thin, fragile and transparent . Shell colour is greenish or yellowish . The shell aperture has a mouth membrane which runs from the umbilicus along the inside of the outer lip . The animal is pale to dark grey or black, paler forms have large dark grey areas . The mantle lobe is very large . Genitalia : Penis with appendix, joins vagina below the insertion of spermatheca duct.
- It is either white or horny to reddish brown and the shell has 6-7 very weakly convex whorls . The last whorl is 75 % of the shell height and the apex is pointed . The aperture has a white layer at the parietal side, the parietalis ( the spiral ridge on the parietal region projecting into the interior of the shell ) is usually strong . The columellaris ( or internal lip of the shell aperture ) is moderately or indistinctly developed.