Project 565: T. C. Goulding, N. W. Yeung, J. Slapcinsky, E. E. Strong, J. R. Kim, F. J. Brook, K. A. Hayes. 2023. Tiny Snails With Large Distributions: Systematics and Delimitation of the Pacific Land Snails Pacificella and Lamellidea (Stylommatophora: Achatinellidae: Pacificellinae). Bulletin of the Society of Systematic Biologists. 2 (2):1-42.
Specimen: Lamellidea peponum (A. Gould, 1847) (BPBM:288668)
View: Shell aperture

Abstract

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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Article DOI: 10.18061/bssb.v2i2.8873

Project DOI: 10.7934/P565, http://dx.doi.org/10.7934/P565
This project contains
  • 104 Media
  • 12 Taxa
  • 89 Specimens
Total size of project's media files: 601.87M

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MorphoBank Project 565
  • Creation Date:
    29 July 2011
  • Publication Date:
    20 August 2024

    This research
    supported by

    Authors' Institutions

    • National Museum of Natural History, Smithsonian Institution

    • Bernice P. Bishop Museum, Honolulu

    • Florida Museum of Natural History



    Members

    member name taxa specimens media
    Kenneth Hayes
    Project Administrator
    010
    Tricia Goulding
    Full membership
    1288104
    Norine Yeung
    Full membership
    000


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