The respiratory system of gastropods varies greatly in form. These variations were once used as a basis for dividing the group into subclasses. The majority of marine gastropods breathe through a sing
The sea slug Pleurobranchaea meckelii respires using a gill which is visible in this view of the right side of the animal
Freshwater snail Melanoides tuberculata. Arrows are pointing to the pallial tentacles for breathing.
The dorid nudibranch Chromodoris joshi has a rosette of gills far back on the body. Nudibranch means "naked gills". Near the front of the animal are the two rhinophores.
In this image of an individual of Cepaea nemoralis, a pulmonate land snail, the pallial lung is visible through the translucent shell as the brightest yellow part of the body whorl
Lung
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The lungs are the primary organs of the respiratory system in many animals, including humans. In mammals and most other tetrapods, two lungs are located near the backbone on either side of the heart.
Respiratory system of gastropods
…cause a problem with fouling. In the pulmonate gastropods, which are found on both land and in freshwater, the gill has been replaced by a simple lung. In gastropods in many ancient lineages, the gills are bipectinate, having an overall shape that is similar to a bird's feather, with narrow filaments…
The human lungs flank the heart and great vessels in the chest cavity.
Chest CT (axial lung window)
Chest CT (coronal lung window)
Cross-sectional detail of the lung