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- W4385202353 abstract "Abstract Background Appendicularia consists of approximately 70 purely marine species that belong to Tunicata the probable sister taxon to Craniota. Therefore, Appendicularia plays a pivotal role for our understanding of chordate evolution. In addition, appendicularians are an important part of the epipelagic marine plankton. Nevertheless, little is known about appendicularian species, especially from deeper water. Results Using µCT, scanning electron microscopy, and digital 3D-reconstruction techniques we describe three pairs of complex oral sensory organs in the mesopelagic appendicularian Bathochordaeus stygius . The oral sensory organs are situated at the anterior and lateral margin of the mouth and inside the mouth cavity. A single organ consists of approximately 70 secondary receptor cells that project apical cilia through a narrow hole in the epidermis. The receptor cells are innervated by branches of the second brain nerve. Conclusions Based on position, morphology, and innervation we suggest that the oral sensory organs are homologues of the coronal organs in other tunicates. We discuss the hypothesized homology of coronal organs and the lateral line system of primary aquatic vertebrates. The complex oral sensory organs of B. stygius unique in tunicates could be adaptations to the more muffled environment of the mesopelagic." @default.
- W4385202353 created "2023-07-25" @default.
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- W4385202353 date "2023-07-24" @default.
- W4385202353 modified "2023-09-23" @default.
- W4385202353 title "The oral sensory organs in Bathochordaeus stygius (Tunicata Appendicularia) are unique in structure and homologous to the coronal organ" @default.
- W4385202353 doi "https://doi.org/10.21203/rs.3.rs-3167810/v1" @default.
- W4385202353 hasPublicationYear "2023" @default.
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