Ontogeny of the brain of Microglanis garavelloi Shibatta and Benine 2005 (Teleostei: Siluriformes: Pseudopimelodidae)

Author(s)

Abrahao, Vitor P. ; Ballen, Gustavo A. ; Pastana, Murilo N. L. ; Shibatta, Oscar A.

• Document type: Journal article
• Source: Journal of Morphology; v. 282, n. 4, p. 11-pg., 2021-01-19.

Abstract

The gross brain morphology and the peripheral olfactory organ of Microglanis garavelloi are described throughout development, and the relationship of these organs to the general behaviour of the species is discussed. During the development, the main brain subdivisions undergo a series of morphological changes keeping a relatively constant volume increase. However, we observed different growth rates in the brains of males and females when these were compared. During the maturation process, a series of hormonal events result in the development of some secondary sexual traits in the brain of male specimens, like faster growth rate of brain areas linked to motor control, olfactory and visual responses. The number of olfactory-organ lamellae increases continuously in both males and females, during their maturation period. These results suggest that changes may be caused by cognitive demands that this species is exposed to throughout its lifespan. The gross morphological arrangement of the central nervous system indicates shared patterns with other members of the family Pseudopimelodidae. (AU)

• FAPESP's process: 15/26804-4 - Integrating morphological and molecular data in the systematics of three siluriform subgroups: subfamily Copionodontinae (Trichomycteridae), genus Pimelodella (Heptapteridae) and family Cetopsidae
• Grantee: Mario Cesar Cardoso de Pinna
• Support Opportunities: Regular Research Grants
• FAPESP's process: 16/02253-1 - Paleoichthyology of the Sincelejo formation (late Pliocene) in northern Colombia
• Grantee: Gustavo Adolfo Ballen Chaparro
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
• FAPESP's process: 17/17957-7 - COMPARATIVE NEUROANATOMY IN CETOPSIDAE (OSTARIOPHYSI: SILURIFORMES) AND SIMULTANEOUS ANALYSIS OF MORPHOLOGICAL AND MOLECULAR DATA
• Grantee: Vitor Pimenta Abrahão
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 14/11397-1 - Phylogenetic relationships in the family Cetopsidae (Osteichthyes, Ostariophysi, Siluriformes) with simultaneous analysis of morphological and molecular data
• Grantee: Vitor Pimenta Abrahão
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 14/11558-5 - Fossil freshwater fishes and the biogeography of Northern South America
• Grantee: Gustavo Adolfo Ballen Chaparro
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 16/19075-9 - Diversity and evolution of Gymnotiformes (Teleostei, Ostariophysi)
• Grantee: Naercio Aquino Menezes
• Support Opportunities: Research Projects - Thematic Grants