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shell aperture造句

"shell aperture"是什么意思   

例句與造句

  1. The shell aperture is semilunar and a little oblique.
  2. The shell aperture is subhorizontal, semicircular, obstructed by 5 or 6 teeth.
  3. The shell aperture is normally oval, and often tangential to the coiling axis.
  4. The shell aperture is ovate, and is a fleshy-brown color inside.
  5. The shell as a whole has seven slightly convex operculum partially covers the shell aperture.
  6. It's difficult to find shell aperture in a sentence. 用shell aperture造句挺難的
  7. Adults are about 70 mm in length with an diameter of about 11 mm at the shell aperture.
  8. Many families have opercula that are reduced in size, and which are not capable of closing the shell aperture.
  9. There is a calcified layer over the lower half of the shell aperture which is formed by the inner lip.
  10. They hold small snails with the shells aperture-upward with the front of its foot and eat their way down.
  11. The shell aperture follows the slope of the spire, is semicircular, and is contracted by six strong, curved lamellae.
  12. The shell aperture is located on the right side, i . e . the shell of this species is almost always dextral in coiling.
  13. 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.
  14. 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.
  15. 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.
  16. 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.

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