Poeaim, Supattra

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Preferred name
Poeaim, Supattra
Alternative Name
Poeaim, S.
Poeaim, Supattar
Main Affiliation
Email
supattra.poe@kmitl.ac.th

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    Item type:Publication,
    Four new species of genus Acmella W.T. Blanford, 1869 (Gastropoda, Assimineidae) from Southern Thailand
    (2025-01-01)
    Seedee, Kunya
    ;
    Dumrongrojwattana, Pongrat
    ;
    Poeaim, Supattra
    This study explores the diversity of microsnails inhabiting limestone caves in Southern Thailand. It describes four new species of the genus Acmella W.T. Blanford, 1869 (Gastropoda, Assimineidae): Acmella krueangensis sp. nov. from Ranong Province, A. thamsingensis sp. nov. and A. changphueakensis sp. nov. from Chumphon Province, and A. kanchanaditensis sp. nov. from Surat Thani Province. These species are distinguished by shell morphology, particularly the number of striae on the last whorl and the protoconch sculpture. Phylogenetic analyses based on mitochondrial cytochrome c oxidase subunit I (COI) gene sequences further support their distinctiveness and clarify their taxonomic placement. The results enhance the understanding of Acmella diversity in Thailand and shed light on biogeographical patterns found in this genus and the adaptations needed to survive under the conditions of cave systems.
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    Chemosensory-Driven Foraging and Nocturnal Activity in the Freshwater Snail Rivomarginella morrisoni (Gastropoda, Marginellidae): A Laboratory-Based Study
    (2025-12-01)
    Subpayakom, Navapong
    ;
    Dumrongrojwattana, Pongrat
    ;
    Poeaim, Supattra
    Rivomarginella morrisoni is a freshwater snail endemic to Thailand, yet its behavioral ecology remains poorly understood. This study described the feeding behavior of R. morrisoni, focusing on its foraging activity, behavioral patterns, and food detection mechanisms under laboratory conditions using specimens collected from four river basins in central Thailand. Daily monitoring revealed nocturnal emergence, peaking between 21:00 and 22:00 h, with stable rhythms established 72 h post-feeding. Feeding trials revealed a preference for aged shrimp over fresh or decayed ones. Behavioral observations confirmed that food localization in R. morrisoni was mediated by chemical cues. Light–dark tests indicated a slight tendency toward darkness, but no significant phototactic response was observed. These findings suggest that R. morrisoni is a generalist scavenger with chemosensory-driven foraging and nocturnal activity. Its apparent sensitivity to habitat disturbance underscores the relevance of behavioral studies for informing future conservation and captive breeding efforts.
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    Genetic Differentiation and Population Structure of the Freshwater Snail Rivomarginella morrisoni (Gastropoda: Marginellidae) in Central and Southern Thailand
    (2026-03-01)
    Subpayakom, Navapong
    ;
    Wanitjirattikal, Puntipa
    ;
    Dumrongrojwattana, Pongrat
    ;
    Poeaim, Supattra
    Rivomarginella morrisoni (Gastropoda: Marginellidae) is a narrowly distributed freshwater snail inhabiting drainage basins of central and southern Thailand. To clarify patterns of genetic differentiation across its range, 45 individuals from 11 sites across eight river basins were analyzed using two dominant molecular markers: sequence-related amplified polymorphism (SRAP) and inter-simple sequence repeats (ISSR). SRAP primers produced higher polymorphic information content (PIC) values than ISSR primers (0.35 vs. 0.27). Analysis of molecular variance (AMOVA) revealed strong population structure, with 80.29% of the genetic variation occurring among populations and 19.71% within populations Population differentiation statistic (PhiPT) = 0.803, p < 0.001). Unweighted Pair Group Method with Arithmetic mean (UPGMA) and principal coordinate analysis (PCoA) consistently separated central and southern populations, and STRUCTURE supported K = 2 as the most likely number of clusters. Similarly, principal component analysis (PCA) of morphological traits also distinguished specimens into two groups corresponding to these geographic regions, confirming region-specific divergence. Overall, the genetic and morphological patterns indicate restricted gene flow among basins and a clear separation between central and southern lineages of R. morrisoni. This study provides the first molecular evidence of population structure in this species and offers important baseline information for future taxonomic, ecological, and conservation research on freshwater marginellid snails.