Land Snails (Stylommatophora)

Tompa, Alex S.

doi:10.1016/b978-0-08-092659-9.50009-0

Cited by 147 publications

(177 citation statements)

References 117 publications

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“…Terrestrial pulmonates form a spermatophore during copulation and transfer it rapidly near the end of copulation (Tompa 1984). Thus, most probably, the early termination of copulation between female BS and male BP mechanically prevented the insemination of BS.…”

Section: Discussionmentioning

confidence: 99%

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Asymmetric reproductive isolation during simultaneous reciprocal mating in pulmonates

et al. 2009

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The generality of asymmetric reproductive isolation between reciprocal crosses suggests that the evolution of isolation mechanisms often proceeds in reciprocal asymmetry. In hermaphroditic snails that copulate simultaneously and reciprocally, asymmetry in premating isolation may not be readily detectable because the failure of the symmetric performance of courtship would prevent copulation from occurring. On the other hand, through their prolonged copulation, snails discriminate among mates when exchanging spermatophores for their benefit and thus may exhibit asymmetric reproductive isolation during interspecific mating. However, no clear case of reciprocal asymmetry has been found in reproductive isolation between snail species. Here we show a discrete difference in hybridization success between simultaneous reciprocal copulations between two species of pulmonate snails. Premating isolation of Bradybaena pellucida (BP) and Bradybaena similaris (BS) is incomplete in captivity. In interspecific copulation, BP removes its penis without transferring a spermatophore, while BS sires hybrids by inseminating BP. Thus, 'male' BP or 'female' BS rejects the other individual, while female BP and male BS accept each other, so that the two sexes of either BP or BS oppose each other in mate discrimination. Our results are a clear example of asymmetry in reproductive isolation during simultaneous reciprocal mating between hermaphroditic animals.

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Section: Discussionmentioning

confidence: 99%

“…While copulation often lasts several hours in pulmonates ( Tompa 1984), the partners examine each other before transferring a spermatophore (Leonard 2006). Thus, they may exhibit reciprocal asymmetry in prezygotic isolation during mating between species.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric reproductive isolation during simultaneous reciprocal mating in pulmonates

et al. 2009

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“…It would not be realistic with regard to the majority of the pulmonate species to accept simply a certain percentage of selfing. In laboratory experiments, selfing turns out to be possible in several species, after a relatively long period of isolation of the adult individual; it may be accompanied then by a considerable fitness reduction (Tompa, 1984;Chen, 1994). Nevertheless, selfing may be relevant when a mirror-image individual cannot find a mate.…”

Section: Introductionmentioning

confidence: 99%

Ease of fixation of a change in coiling: computer experiments on chirality in snails

Batenburg¹,

Gittenberger²

1996

Heredity

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This paper deals with chirality of snails. It explores the ease of fixation of a change in coiling direction, caused by an invasion of snails carrying a mutant chirality allele into a normal, homogeneous population, by using Monte-Carlo simulation. Additionally, single-gene speciation on the basis of chirality is discussed. Six factors are studied in particular, namely: (i) the absolute and relative population size; (ii) the mating success, which is known to be related to shell shape, especially the height/width ratio; (iii) the maternal effect, underlying chirality; (iv) the (low) mobility of the snails; (v) fitness differences (heterosis); and (vi) the invading mutant allele being either dominant or recessive. The impact of these factors is quantified. Small populations with not too few invaders and dominance of the mutant chirality allele are of paramount relevance for its occasional fixation. In comparison to this, the maternal effect turns out to be considerably less significant, whereas the mobility of the snails plays only a minor role. The simulations confirm the expectation that heterosis can be very effective. Logically, the mating success is also a very important factor. This reflects the observation in nature that among snails with slender shells, when mating between mirror-image individuals is still possible to a certain extent, reverse populations have originated far more frequently than among snails with globular shells, where such matings are impossible. Only the latter cases, which are very rare in nature, may concern single-gene speciation.

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“…The podocyst which has been described as a giant thin walled pulsatile sac is attached to the foot of the embryo (CATHER & TOMPA 1972) or an extension of the embryonic foot (TOMPA 1984) in Strophocheilus oblongus. It has also been described as a pedal sinus in H. aspersa by JERUSALIMSKY & BALABAN (2001).…”

Section: 1mentioning

confidence: 99%

“…neonates get a faster start in growth by eating their egg shells and the egg shells and albumen of unhatched dead eggs in the nest (TOMPA 1984, BAUR & BAUR 1986, BAUR 1990, DESBUQUOIS 1997, DESBUQUOIS & MADEC 1998.…”

Section: Resumo Micrmentioning

confidence: 99%

Light and electron microscopy study of late embryonic development in the land snail Limicolaria flammea (Müller) (Pulmonata, Achatinidae)

Egonmwan

2007

Rev. Bras. Zool.

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The late stages of embryogenesis in the achatinid land snail Limicolariaflammea (Müller, 1774) were described using light and electron microscopy. Embryos at various stages of development were present in the eggs during the first hour after they were laid, from 4-cell blastulae to morulae and fairly advanced stages. The advanced embryo which was fully developed on the second day bears a long cephalic sac, first to be developed, attached to the embryo and a podocyst which is attached to the foot of the embryo. Both of these structures are reduced in size as embryogenesis progresses until they finally disappear at about the 7th day after the egg was deposited. The embryonic shell was apparent on the second day and spiral coiling was apparent at about day 5. The spiral shell had one whorl when formed and more spirals were added so that at hatching the young snails had three whorls.

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Land Snails (Stylommatophora)

Cited by 147 publications

References 117 publications

Asymmetric reproductive isolation during simultaneous reciprocal mating in pulmonates

Asymmetric reproductive isolation during simultaneous reciprocal mating in pulmonates

Ease of fixation of a change in coiling: computer experiments on chirality in snails

Light and electron microscopy study of late embryonic development in the land snail Limicolaria flammea (Müller) (Pulmonata, Achatinidae)

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