Evolution of reproductive strategies in the species-rich land snail subfamily Phaedusinae (Stylommatophora: Clausiliidae)

Mamos, Tomasz; Weerd, Dennis R. Uit de; Oheimb, Parm Viktor von; Sulikowska-Drozd, Anna

doi:10.1016/j.ympev.2020.107060

Cited by 15 publications

(21 citation statements)

References 67 publications

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“…Three calibration dates were used for dating the divergence time, two secondarily external calibration points, and a biogeographical calibration point. The first external calibration was based on the estimated divergence age of the common ancestor of Phaedusinae (Mamos et al, 2021). A lognormal prior (mean = 28.4 MYA, standard deviation [SD] = 0.15 MYA) was set for the node ages.…”

Section: Methodsmentioning

confidence: 99%

“…Colours of circles and triangles represent species of Formosana and outgroups. Red lines delineate the areas used for biogeographical analysis (see text and Figure 5a for details) based on the estimated divergence age of the common ancestor of Phaedusinae (Mamos et al, 2021). A lognormal prior (mean = 28.4 MYA, standard deviation [SD] = 0.15 MYA) was set for the node ages.…”

Section: Divergence Time Estimationmentioning

confidence: 99%

“…A lognormal prior (mean = 28.4 MYA, standard deviation [SD] = 0.15 MYA) was set for the node ages. The second external calibration was based on the estimated divergence age between Zaptyx and Changphaedusa (Mamos et al, 2021). A lognormal prior (mean = 24.5 MYA, SD = 0.14 MYA) was set for the node ages.…”

Section: Divergence Time Estimationmentioning

confidence: 99%

“…Nordsieck (1997) treated Formosana as a subgenus of Oospira Blanford, 1872, together with the other seven subgenera, as these taxa have a steeply ascending inferior lamella, a narrow clausilium plate, and parallel palatal plicae, instead of a lunella for clausilial apparatus. However, recent phylogenetic research using molecular evidence did not support the monophyly of Oospira (Mamos et al, 2021;Motochin et al, 2017). Due to the incomplete sampling of all subgenera of Oospira, Motochin et al (2017) refrained from formally revising the taxonomic classification of Oospira.…”

Section: Introductionmentioning

confidence: 99%

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Within‐island diversification in the land snail genus Formosana (Gastropoda, Clausiliidae) in Taiwan

Hwang

Ger

2022

Zoologica Scripta

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The morphology‐based species delimitation of the land snail genus Formosana (Clausiliidae) was questioned, due to the high intraspecific variability and interspecific similarity of morphological characters. The systematics of Formosana from Taiwan are revised using molecular, morphological, and anatomical data. Phylogenies were constructed based on four mitochondrial and nuclear markers, by means of maximum likelihood and Bayesian inference analyses. Twelve valid and endemic species and subspecies were recognised from Taiwan, six of which are newly described herein: Formosana nanaoensis sp. n., Formosana hsuehshanensis sp. n., Formosana lilongshanensis sp. n., Formosana katipulensis sp. n., Formosana kaluluanensis sp. n., and Formosana tianchihensis sp. n. In addition, three nominal species are maintained as synonyms of earlier described species. A congener from China is transferred to the genus Formosanella as a new combination, Formosanella friniana com. n. The variability in morphological characteristics, and resulting difficulties for their taxonomic implication are critically discussed. Divergence time estimation and ancestral range reconstructions indicate that the Taiwanese Formosana most likely colonised in eastern Taiwan, approximately 4.7 million years ago in the Early Pliocene, and then differentiated into four major clades. The speciation events mainly occurred during the Late Pliocene and the Early Pleistocene. The biogeography and diversification of Formosana in Taiwan are discussed, in light of the concept of palaeoislands.

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Section: Methodsmentioning

confidence: 99%

Section: Divergence Time Estimationmentioning

confidence: 99%

Section: Divergence Time Estimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Within‐island diversification in the land snail genus Formosana (Gastropoda, Clausiliidae) in Taiwan

Hwang

Ger

2022

Zoologica Scripta

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“…Viviparous species are known in several subfamilies of Clausiliidae, yet the strategy seems to be most frequent in the species-rich subfamily Phaedusinae. Recently, the phylogeny of the subfamily and ancestral reproductive modes in the selected lineages were reconstructed [13]. It was clearly showed that the basal taxa of the group were oviparous, while viviparity evolved several times independently.…”

Section: Introductionmentioning

confidence: 99%

“Obstetrical dilemma” in viviparous snails

Sulikowska-Drozd

Maltz²,

Janiszewska

2022

Preprint

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Viviparous gastropods keep embryos within their genital tract, hidden as the whole soft body, within a parental shell. Consequently, during birth, shelled offspring pass through the aperture of the parental shell, which results in a trade-off between the dimensions of the aperture and the embryo size. The mechanical obstacles involved in this process mirror the selection of obstetrics experienced by humans, as well as the pelvic constraints recorded in other tetrapods. The repeated evolution of viviparity in Clausiliidae, the family of land snails, which produce complex apertural barriers, gave us the opportunity to explore different ways of overcoming this evolutionary conflict. Most viviparous species are adapted by broadening of the shell canal and/or reduction of embryonic width. Some species reduce apertural barriers to the extent that they are no longer functional, whilst others produce unusual flexible, “soft shelled” embryos. The latter adaptation, recorded here for the first time, allows to overcome the “obstetrical dilemma” with minimal change in the outline of the adult shell and apertural barriers. The thickness and organomineral structure of flexible embryonic shells were investigated, compared to the typical “hard” shell of clausiliid embryos, which are rigid and unpliable already in the genital tract of the parent.

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Mother snail labors for posterity in bed of mid-Cretaceous amber

Jochum

Neubauer

2021

Gondwana Research

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Evolution of reproductive strategies in the species-rich land snail subfamily Phaedusinae (Stylommatophora: Clausiliidae)

Cited by 15 publications

References 67 publications

Within‐island diversification in the land snail genus Formosana (Gastropoda, Clausiliidae) in Taiwan

Within‐island diversification in the land snail genus Formosana (Gastropoda, Clausiliidae) in Taiwan

“Obstetrical dilemma” in viviparous snails

Mother snail labors for posterity in bed of mid-Cretaceous amber

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