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DECIPHERING THE ORIGINS OF THE VERTEBRATE PALLIUM: EVIDENCE FROM BASAL ACTINOPTERYGIAN FISHES
Adrián Chinarroand 11 co-authors
Faculty of Biological Sciences
FENS Forum 2026 (2026)
Barcelona, Spain
Board PS03-08AM-415
Presentation
Date TBA
Board: PS03-08AM-415
Event Information
Poster Board
PS03-08AM-415
Poster
View posterAbstract
The ancestral organization of the telencephalic pallium in osteichthyan fishes remains elusive but central in evolutionary neurobiology, as it provides valuable information for understanding the complexity found in sarcopterygians as well as its evolutionary history. To shed light on this question, we used different experimental techniques to compare the developing expression of conserved markers across pallial domains and cell types, as well as their connectivity, in different fish species ranging from the most ancestral lineages of actinopterygians (cladistian fishes) to teleosts, a key model for understanding the secondary fused-everted telencephalon. Our findings reveal distinctive patterns of regionalization in pallial areas, with conserved features, particularly in domains related to navigation and olfactory processing, as well as the presence of amygdaloid populations. These results demonstrate an anatomo-functional organization in which different pallial regions are specialized in processing specific types of information. This level of complexity is comparable to that observed in other amniote vertebrates, highlighting the advanced organization of the actinopterygian pallium.
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