AI Article Synopsis
- - The buccinid snail genus is redefined through molecular phylogeny and examination of shell features, distinguishing it from other genera in the Parancistrolepidinae subfamily based on traits like low spire and long siphonal canal.
- - Three distinct species are identified in the bathyal waters around Japan and Taiwan, each adapted to specific regions, indicating limited dispersal capability due to their development patterns.
- - Seafloor topography serves as a barrier to dispersal, and findings reinforce that the Izu Peninsula influences the distribution of certain bathyal gastropod species with boreal origins.
Article Abstract
The deep-sea buccinid snail genus is redefined based on the reconstruction of a molecular phylogeny and morphological examination of shell and radular characters. This genus is distinguished from other genera of the subfamily Parancistrolepidinae with a combination of shell traits, including (1) a low spire, (2) sharp, carinate spiral cords or keels and (3) a long, curved siphonal canal, but not with a difference in radular morphology as suggested by previous authors. Three allopatric or parapatric species are recognized in the upper bathyal (447-2057 m) waters around Japan and Taiwan: . from off Hokkaido to Sagami Bay in the Northwest Pacific, . off Kumano-nada to Miyazaki in the Northwest Pacific and along Nansei Islands in the East China Sea, and . sp. nov. in the South China Sea. These species bear large paucispiral protoconchs that are indicative of benthic early development without a pelagic larval period, and hence low dispersal capability. Seafloor topography seems to have acted as a barrier for their dispersal; the range of . supports the previous finding that Izu Peninsula delimits westward distribution of bathyal gastropod species of boreal origins.
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| http://dx.doi.org/10.2108/zs230067 | DOI Listing |
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