Drilling in the dorid species Vayssierea cf. elegans (Gastropoda: Nudibranchia): functional and comparative morphological aspectsстатья
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Дата последнего поиска статьи во внешних источниках: 15 августа 2019 г.
Аннотация:The drilling mode of feeding is known from two clades of Gastropoda: Caenogastropoda and Heterobranchia, but the level of convergence and parallelism or homology among these different lineages is still unclear. The morphology of the buccal complex and mechanism is well studied for drilling caenogastropods, but poorly known for drilling nudibranchs. Accordingly, a comparison between the feeding mechanisms of drilling nudibranchs and caenogastropods is necessary for the understanding of evolutional trends inside gastropods. In the present study, we redescribe the morphology of the buccal complex of drilling dorid nudibranch Vayssierea cf. elegans, and compare our data to that of previous investigations on this species and closely related dorid species. We describe the feeding mechanism of this species based on the obtained morphological and literature data and compare it to the feeding mechanisms described for drilling caenogastropods. The feeding apparatus of Vayssierea cf. elegans corresponds more to the general plan for the dorid buccal complex; it has a similar arrangement of the buccal musculature and pattern of radular morphology. However, there are also some adaptations to a specialized feeding mode quite similar to those found in Caenogastropoda: specialized dissolving glands and lateral teeth with elongated pointed cusps; and even Sacoglossa: the specialized muscle for sucking. The feeding mechanism of Vayssierea cf. elegans includes the same two stages as those described for drilling caenogastropods: 1) the boring stage, which is provided by mechanical and chemical activity, and 2) the swallowing stage.