Sentence examples for shell aperture from inspiring English sources

At around 90 mm shell length the color lines at the shell aperture were replaced by a fully white ventral apertural margin, used in previous studies to indicate post juvenile stages.

In all cases, the shell aperture is white.

Only adults were collected, distinguished from juveniles by the presence of a reflected lip at the shell aperture, which marks the completion of shell growth [ 14].

When individuals of this species reach sexual maturity, they stop their shell growth and form a reflected lip at the shell aperture.

The whorl shape compression (WSC) is a measure of the ellipsoid of the whorl section of the ammonoid shell aperture, which is a very important ammonoid taxonomic character due to the accretionary growth of the shell.

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 [ 47- 51].

Hermit crabs benefit from some symbionts, particularly cnidarians and bryozoans, through extension of shell apertures (alleviating need to switch into new shells) and by providing protection from predators.

The ventral outline was created by starting and ending at the distinct transitions from the outside of the shell to the aperture.

These foraging tactics of the green crab have selected the S-ecotype to evolve protection by means of a thick shell, a narrow aperture and an elongated shell to withdraw the soft parts [ 49, 51- 53].

Each snail was weighed and measured (shell height and aperture width) and tissues (ganglia, gonad-digestive complex, male penis and sheath, female albumin glands) were dissected out and snap frozen on liquid nitrogen for RNA extractions.

Trapping data show a male∶female sex ratio of 83∶17 from animals mature enough to determine sex and an age distribution of 0.002% juvenile Nautilus, 42% sub-adult and 58% mature individuals (mature animals were identified by the presence of a black apertural margin; in juveniles color banding is continuous to aperture and shell length is <90 mm).