Asymmetric Mandibles of Water‐Scavenger Larvae Improve Feeding Effectiveness on Right‐Handed Snails

Inoda, Toshio; Hirata, Y.; Kamimura, Shinji

doi:10.1086/378903

Cited by 40 publications

(44 citation statements)

References 8 publications

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“…, 2004). Some snail‐eating aquatic predators are known to specialize in the dextral majority of prey (Inoda et al. , 2003; Dietl & Hendricks, 2006).…”

Section: Discussionmentioning

confidence: 99%

Evolution of whole‐body enantiomorphy in the tree snail genus Amphidromus

Sutcharit

Asami

Panha

2006

J of Evolutionary Biology

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Diverse animals exhibit left–right asymmetry in development. However, no example of dimorphism for the left–right polarity of development (whole‐body enantiomorphy) is known to persist within natural populations. In snails, whole‐body enantiomorphs have repeatedly evolved as separate species. Within populations, however, snails are not expected to exhibit enantiomorphy, because of selection against the less common morph resulting from mating disadvantage. Here we present a unique example of evolutionarily stable whole‐body enantiomorphy in snails. Our molecular phylogeny of South‐east Asian tree snails in the genus Amphidromus indicates that enantiomorphy has likely persisted as the ancestral state over a million generations. Enantiomorphs have continuously coexisted in every population surveyed spanning a period of 10 years. Our results indicate that whole‐body enantiomorphy is maintained within populations opposing the rule of directional asymmetry in animals. This study implicates the need for explicit approaches to disclosure of a maintenance mechanism and conservation of the genus.

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“…, 2004). Some snail‐eating aquatic predators are known to specialize in the dextral majority of prey (Inoda et al. , 2003; Dietl & Hendricks, 2006).…”

Section: Discussionmentioning

confidence: 99%

Evolution of whole‐body enantiomorphy in the tree snail genus Amphidromus

Sutcharit

Asami

Panha

2006

J of Evolutionary Biology

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“…Recent studies have highlighted the adaptive significance of asymmetric organs and their consequent behaviours; for example, laterally biased male-male fighting in fish (Takeuchi et al 2010), left/right-handed scale-eating in fish (Hori 1993), right-handed snail-eating in snakes (Hoso et al 2007) and in larval water beetles (Inoda et al 2003), and left/rightward predator-avoiding jumping in shrimp (Takeuchi et al 2008), crayfish (Tobo et al 2012) and cuttlefish (Lucky et al 2012). Insects are the most divergent animal group and their taxonomic literature has provided details on many cases of asymmetric genitalia (reviewed by Huber et al 2007;Schilthuizen 2013).…”

Section: Introductionmentioning

confidence: 99%

Left-handed sperm removal by male Calopteryx damselflies (Odonata)

Tsuchiya

Hayashi

2014

SpringerPlus

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Male genitalia in several insect species are asymmetry in right and left shape. However, the function of such asymmetric male genitalia is still unclear. We found that the male genitalia of the damselfly Calopteryx cornelia (Odonata: Calopterygidae) are morphologically symmetric just after emergence but asymmetric after reproductive maturation. Males remove rival sperm stored in the female bursa copulatrix (single spherical sac) and the following spermatheca (Y-shaped tubular sac) prior to their own ejaculation to prevent sperm competition. Males possess the aedeagus with a recurved head to remove bursal sperm and a pair of spiny lateral processes to remove spermathecal sperm. The right lateral process is less developed than the left, and sperm stored in the right spermathecal tube are rarely removed. Experiments involving surgical cutting of each lateral process demonstrated that only the left process functions in spermathecal sperm removal. Thus, males of C. cornelia are left-handed in their sperm removal behaviour at copulation.

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“…Without such asymmetry, there is nothing upon which selection can act (e.g. Clarke & Murray, 1969; Inoda et al. , 2003; Dietl & Hendricks, 2006; Hoso et al.…”

Section: Discussionmentioning

confidence: 99%

“…More recently, sexual selection (Schilthuizen et al. , 2007) and especially predation (Inoda et al. , 2003; Dietl & Hendricks, 2006; Hoso et al.…”

Section: Introductionmentioning

confidence: 99%

The effect of coil phenotypes and genotypes on the fecundity and viability of Partula suturalis and Lymnaea stagnalis: implications for the evolution of sinistral snails

Davison

Barton

Clarke

2009

J of Evolutionary Biology

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Why are sinistral snails so rare? Two main hypotheses are that selection acts against the establishment of new coiling morphs, because dextral and sinistral snails have trouble mating, or else a developmental constraint prevents the establishment of sinistrals. We therefore used an isolate of the snail Lymnaea stagnalis, in which sinistrals are rare, and populations of Partula suturalis, in which sinistrals are common, as well as a mathematical model, to understand the circumstances by which new morphs evolve. The main finding is that the sinistral genotype is associated with reduced egg viability in L. stagnalis, but in P. suturalis individuals of sinistral and dextral genotype appear equally fecund, implying a lack of a constraint. As positive frequency‐dependent selection against the rare chiral morph in P. suturalis also operates over a narrow range (< 3%), the results suggest a model for chiral evolution in snails in which weak positive frequency‐dependent selection may be overcome by a negative frequency‐dependent selection, such as reproductive character displacement. In snails, there is not always a developmental constraint. As the direction of cleavage, and thus the directional asymmetry of the entire body, does not generally vary in other Spiralia (annelids, echiurans, vestimentiferans, sipunculids and nemerteans), it remains an open question as to whether this is because of a constraint and/or because most taxa do not have a conspicuous external asymmetry (like a shell) upon which selection can act.

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Asymmetric Mandibles of Water‐Scavenger Larvae Improve Feeding Effectiveness on Right‐Handed Snails

Cited by 40 publications

References 8 publications

Evolution of whole‐body enantiomorphy in the tree snail genus Amphidromus

Evolution of whole‐body enantiomorphy in the tree snail genus Amphidromus

Left-handed sperm removal by male Calopteryx damselflies (Odonata)

The effect of coil phenotypes and genotypes on the fecundity and viability of Partula suturalis and Lymnaea stagnalis: implications for the evolution of sinistral snails

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