Lessons from Timor: Shells are poor taxonomic indicators in <i>Asperitas</i> land snails (Stylommatophora, Dyakiidae)

Köhler, Frank; Criscione, Francesco; Hallan, Anders; Hyman, Isabel T.; Kessner, Vince

doi:10.1111/zsc.12449

Cited by 9 publications

(2 citation statements)

References 43 publications

(54 reference statements)

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“…Current systematic classification of the Dyakiidae and Ariophantidae is still heavily influenced by traditional shell-based characters, and is sometimes incongruent with molecular phylogeny (Hyman et al, 2007(Hyman et al, , 2017Köhler et al, 2020). Diagnostic characters of reproductive organs in Dyakiidae are the presence of amatorial organ complex (amatorial organ gland and duct) and the connection of the gametolytic organ to the amatorial organ (Laidlaw, 1931;Hausdorf, 1995;Sutcharit et al, 2012).…”

Section: Evolution Of the Sinistral Clade Within The Dextral-dominatementioning

confidence: 99%

Reassessment and systematic position of the sinistral snails of genus Hemiplecta from Thailand (Eupulmonata: Ariophantidae), with description of two new species

et al. 2020

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Indochina land snails of the family Ariophantidae are in need of thorough systematic revision. Here we comprehensively revise the systematics of the large-shelled, sinistral (counterclockwise) coiling snails from Thailand and Peninsular Malaysia. Molecular phylogeny based on mitochondrial (coi and 16S) and nuclear (28S) gene sequences demonstrates that these sinistral snails are not members of Dyakiidae as previously thought, but instead are more closely related to the genus Hemiplecta in the family Ariophantidae. Comparative morphology also reveals similarity of reproductive organ features (globular gametolytic organ, well-developed dart apparatus, and lack of amatorial organ complex). Based on this evidence, we propose to transfer these sinistral snails to the genus Hemiplecta. Molecular phylogenetic analyses further strongly support the monophyly of this sinistral lineage with respect to other members of Hemiplecta. This monophyletic clade consists of five members including three species that were previously classified as “Dyakia”, H. lahatensis, H. retrorsa and H. salangana, and two new species described herein, H. ligorica n. sp. and H. thailandica n. sp. This study also suggests that the anatomy of the gametolytic organ in the genus Hemiplecta corresponds well with the phylogenetic relationships and appears to be a taxonomically informative character, while the penial verge has little utility for generic recognition.

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Section: Evolution Of the Sinistral Clade Within The Dextral-dominatementioning

confidence: 99%

Reassessment and systematic position of the sinistral snails of genus Hemiplecta from Thailand (Eupulmonata: Ariophantidae), with description of two new species

et al. 2020

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“…Shell morphology can provide characters useful for distinguishing gastropod species as part of an integrative taxonomic approach (Horsáková et al, 2020;Pholyotha et al, 2020;Sawada et al, 2021), but high intraspecific variation in shell morphology has also been observed in some island gastropod taxa, evidence that over-reliance on shell characters can lead to taxonomic over-splitting (M. S. Johnson & Stankowski, 2018;Köhler et al, 2020;Stankowski, 2011). The unornamented and variable shells of Lamellidea and Pacificella species were previously considered to represent eight Lamellidea species in the Hawaiian Islands (Pilsbry & Cooke 1915[in 1914-1916; Cooke & Kondo, 1961), but it remained difficult to identify taxa to species level based on high intraspecific variation.…”

Section: Species Delimitationmentioning

confidence: 99%

Tiny Snails With Large Distributions: Systematics and Delimitation of the Pacific Land Snails Pacificella and Lamellidea (Stylommatophora: Achatinellidae: Pacificellinae)

Goulding

Yeung

Slapcinsky

et al. 2023

BSSB

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The Pacificellinae are a group of small, high-spired land snails distributed on islands across the Pacific. Some species are endemic to particular island groups, but others have wide geographic distributions, several of which have been attributed to anthropogenic transport between islands before western contact. We used DNA sequence data (COI, 16S, ITS2, 28S) from recently collected and historical specimens to estimate a phylogeny of the Pacificellinae, with a focus on Hawaiian species. Phylogenetic analyses support recognizing Lamellidea and Pacificella as distinct genera and indicate that the genus group Tornatellinops should be regarded as a synonym of Lamellidea. The number of taxa defined by species delimitation analyses (ASAP, bPTP, mPTP) varies widely, with between 6 and 42 species estimated in the Hawaiian Islands. These candidate species hypotheses were evaluated in an integrative framework, including shell morphology, geography, and a multilocus phylogeny, to revise the taxonomy of Hawaiian pacificellines. Four Lamellidea species and two Pacificella species are recognized from the Hawaiian Islands, including two widespread species introduced to Hawaiʻi from the South Pacific. Lamellidea peponum in Hawaiʻi shows little genetic divergence from Polynesian specimens previously referred to L. oblonga, and the name L. oblonga is now regarded as a junior synonym. Lamellidea polygnampta is recognized here from across the Hawaiian Islands, L. cylindrica from the island of O‘ahu, and the lowland species, L. extincta, from the main Hawaiian Islands and the Northwestern Islands. The only Pacificella specimens found in Hawai‘i in modern surveys are more closely related to specimens of P. variabilis from Polynesia than to historical specimens of P. baldwini, indicating that the only Pacificella species now found in the main Hawaiian Islands appears to be introduced. Pacificellines have declined in abundance in Hawai‘i over the last century and the two species L. extincta and P. baldwini, formerly present across the Hawaiian Islands, are now either critically endangered or extinct.

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Homoplasy in shells discombobulated the taxonomy: revision of the larger helicarionid land snails of northern Queensland, Australia (Stylommatophora: Helicarionidae)

Hyman

Köhler

2022

Journal of Natural History

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Lessons from Timor: Shells are poor taxonomic indicators in Asperitas land snails (Stylommatophora, Dyakiidae)

Cited by 9 publications

References 43 publications

Reassessment and systematic position of the sinistral snails of genus Hemiplecta from Thailand (Eupulmonata: Ariophantidae), with description of two new species

Reassessment and systematic position of the sinistral snails of genus Hemiplecta from Thailand (Eupulmonata: Ariophantidae), with description of two new species

Tiny Snails With Large Distributions: Systematics and Delimitation of the Pacific Land Snails Pacificella and Lamellidea (Stylommatophora: Achatinellidae: Pacificellinae)

Homoplasy in shells discombobulated the taxonomy: revision of the larger helicarionid land snails of northern Queensland, Australia (Stylommatophora: Helicarionidae)

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