科研之友
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摘要
Comparative 3D-microanatomy reconstructed from histological sections has become a powerful method for investigating anatomical details of small animals, and has been particularly applied to heterobranch gastropods. Here we present first comprehensive 3D data on a member of the Caenogastropoda, the putative sister clade of Heterobranchia. The limnic hydrobiid snail Sadleriana bavarica was collected from its type locality, the Brunnbach, a creek within the city limits of Munich, Germany. External features are described and compared with the holotype; S. bavarica is supported as a valid species based on morphological evidence, but further morphoanatomical examination of allosperm receptacles and molecular analyses are required. Five specimens were embedded in epoxy resin, sectioned serially, and described histologically. With the software Amira 3D models of all major organ systems were generated. Anatomy is compared to other caenogastropods and heterobranchs; special reference is given to the central nervous system. The arrangement and homology of cerebral nerves are discussed, contrasting earlier opinions on the origin and evolution of tentacular nerves.
- 出版日期2014-8
