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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 projecting either side of a central stalk. Gastropods such as abalone and keyhole limpets have two gills, which is believed to be the arrangement in the earliest fossil gastropods. The water ...
No other extant or extinct gastropods possess dermal sclerites, [18] and no other extant animal is known to use iron sulfides in this way, either in its skeleton, [2] or exoskeleton. The size of each sclerite is about 1 × 5 mm in adults. [2] Juveniles have scales in few rows, while adults have dense and asymmetric scales. [24]
The mantle creates a compartment known as the mantle cavity and is used by many mollusca as the surface where gas exchange occurs. Snails that use the mantle cavity as a lung are known as Pulmonate snails. Other snails may only have a gill. Snails in the Caenogastropoda families like Ampullariidae, have both a gill and a lung. [9]
Gastropods (/ ˈ ɡ æ s t r ə p ɒ d z /), commonly known as slugs and snails, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (/ ɡ æ s ˈ t r ɒ p ə d ə /). [5] This class comprises snails and slugs from saltwater, freshwater, and from the land.
A ctenidium is a respiratory organ or gill which is found in many molluscs. This structure exists in bivalves, cephalopods, polyplacophorans (chitons), and in aquatic gastropods such as freshwater snails and marine snails. [1]
Pectinate – Like the teeth of a comb, as the gills of some mollusks. [1] Pedal – Pertaining to the foot. [1] Pedunculated – Supported on a stem or stalk, as the eyes of land snails. [1] Pellucid – Transparent or clear, as the shells of some snails; e. g. Vitrea. [1] Penultimate – The whorl before the last in gastropod shells. [1]
Scaly-foot gastropod Chrysomallon squamiferum, common name the scaly-foot gastropod, is a species of deep-sea hydrothermal-vent snail, a marine gastropod mollusc in the family Peltospiridae. This vent-endemic gastropod is known only from deep-sea hydrothermal vents in the Indian Ocean, where it has been found at depths of about 2,400–2,800 m ...
The majority of gastropods have haemolymph containing the respiratory pigment haemocyanin. This is a copper-containing protein that helps to carry oxygen, and gives the haemolymph a pale blue colour. In the freshwater Planorbid snails, however, the haemocyanin is replaced by haemoglobin , and thus their haemolymph is red rather than blue.