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This is because in asexual reproduction a successful genotype can spread quickly without being modified by sex or wasting resources on male offspring who will not give birth. Some species can produce both sexually and through parthenogenesis, and offspring in the same clutch of a species of tropical lizard can be a mix of sexually produced ...
As its Latin name suggests, it is a viviparous (ovoviviparous) snail, a rare phenomenon among snails. The female gives birth to live young, after producing eggs that hatch internally. The female gives birth to live young, after producing eggs that hatch internally.
These land snails have opercula, which helps identify them as "winkles gone ashore", in other words, snails within the clade Littorinimorpha and the informal group Architaenioglossa. Members of the snail family Pulmonata , which includes carboniferous land sails and some freshwater snails of the order Basommatophora , are protandrous ...
Like other natricine snakes such as water snakes (genus Nerodia) and garter snakes (genus Thamnophis), S. dekayi is a viviparous species, giving birth to live young. [13] Sexual maturity is reached at two to three years. Mating takes place in the spring, after snakes emerge from brumation. Between 3 and 41 young are born in late summer. [14]
Adult snails are hermaphroditic (having both male and female reproductive organs) and can live for many years. These are live bearing snails (give birth to live snails instead of laying eggs). These are live bearing snails (give birth to live snails instead of laying eggs).
The anatomy of a common air-breathing land snail: much of this anatomy does not apply to gastropods in other clades or groups. Snails are distinguished by an anatomical process known as torsion, where the visceral mass of the animal rotates 180° to one side during development, such that the anus is situated more or less above the head. This ...
The Chinese mystery snail, black snail, or trapdoor snail (Cipangopaludina chinensis), is a large freshwater snail with gills and an operculum, an aquatic gastropod mollusk in the family Viviparidae. [ 3 ] [ 4 ] The Japanese variety of this species is black and usually a dark green, moss-like alga covers the shell.
The freshwater snail Physa acuta is a self-fertile organism that can be exposed either to strong sexual selection or to self-fertilization depending on its mode of reproduction. Noel et al. [ 29 ] used Physa acuta to experimentally determine whether accumulation of deleterious mutations is avoided by inbreeding populations of the snail, as well ...