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Gastropods are capable of being either male or female, or hermaphrodites, and this makes their reproduction system stand out amongst many other invertebrates. Hermaphroditic gastropods possess both the egg and sperm gametes which gives them the opportunity to self-fertilize. [4] C. obtusus is a snail species of the Eastern Alps. In the ...
The mating of gastropods is a vast and varied topic, because the taxonomic class Gastropoda is very large and diverse, a group comprising sea snails and sea slugs, freshwater snails and land snails and slugs. Gastropods are second only to the class Insecta in terms of total number of species. Some gastropods have separate sexes, others are ...
Gastropods have the greatest numbers of named mollusk species. However, estimates of the total number of gastropod species vary widely, depending on cited sources. The number of gastropod species can be ascertained from estimates of the number of described species of Mollusca with accepted names: about 85,000 (minimum 50,000, maximum 120,000). [9]
Crustacean reproduction varies both across and within species. The water flea Daphnia pulex alternates between sexual and parthenogenetic reproduction. [17] Among the better-known large decapod crustaceans, some crayfish reproduce by parthenogenesis. "Marmorkrebs" are parthenogenetic crayfish that were discovered in the pet trade in the 1990s. [18]
The operculum is attached to the dorsal surface of the rear of the foot of this gastropod, the body of which is wide and T-shaped, and the colour of which varies from spotted grey to greenish to orange. The mouth has a radula, and a respiratory siphon opens on the right side of the head, feeding gills which are located in front of the heart ...
Miocene Gastropods and Biostratigraphy of the Kern River Area, California; United States Geological Survey Professional Paper 642 This article incorporates text from this source, which is in the public domain. Marshall B.A. 2003. A review of the Recent and Late Cenozoic Calyptraeidae of New Zealand (Mollusca: Gastropoda). The Veliger 46(2): 117-144
The Patellogastropoda, common name true limpets and historically called the Docoglossa, are members of a major phylogenetic group of marine gastropods, treated by experts either as a clade [2] or as a taxonomic order. [3] The clade Patellogastropoda is deemed monophyletic based on phylogenetic analysis. [4]
The escape response in gastropods—the perception of stimuli (for example, the presence of a predator nearby) and a subsequent escape motion—is a frequent target of behavioural studies. [25] In gastropods, the perception of environmental chemical stimuli originating, for example, from food or other organisms is possibly mediated by sensory ...