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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

On a remarkable sexual dimorphic trait in the Characiformes related to the olfactory organ and description of a new miniature species of Tyttobrycon Gery (Characiformes: Characidae)

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Abrahao, Vitor Pimenta [1, 2] ; Pastana, Murilo [1] ; Marinho, Manoela [1, 3]
Total Authors: 3
[1] Univ Sao Paulo, Museu Zool, Sao Paulo, SP - Brazil
[2] Univ Fed Bahia, Inst Biol, Programa Posgrad Biodiversidade & Evolucao, Rua Barao Geremoabo, Salvador, BA - Brazil
[3] Univ Fed Paraiba, Dept Sistemat & Ecol CCEN, Lab Sistemat & Morfol Peixes, Campus 1, Joao Pessoa, PB - Brazil
Total Affiliations: 3
Document type: Journal article
Source: PLoS One; v. 14, n. 12 DEC 18 2019.
Web of Science Citations: 1

Among the order Characiformes, secondary sexual dimorphism is commonly associated to the occurrence of bony hooks on fins, shape and length of the dorsal and anal fins, and sexual dichromatism. The analysis of a new miniature Characidae species of the genus Tyttobrycon, described herein, yielded to the discovery of a sexually dimorphic trait related to nostril aperture and number of olfactory lamellae. In this type of dimorphism, mature males present larger nostril aperture and higher number of olfactory lamella than females. A dimorphic olfactory organ is for the first time recorded and described for a member of the Characiformes. Gross morphology and development of brain and peripheral olfactory organ of Tyttobrycon sp. n. are described and compared to other species of Characidae. It is hypothesized that such dimorphic trait is related to male-male detection during cohort competition in small characids. The new species of Tyttobrycon is diagnosed from its congeners by the number of branched anal-fin rays (19-21) and the absence of a caudal-peduncle blotch. It occurs in a small tributary of Rio Madeira basin, near to the limit between Brazil and Bolivia, Acre State, Brazil. (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 type: Regular Research Grants
FAPESP's process: 12/22685-2 - Canals and pores of the cephalic laterosensory system of Characiformes (Ostariophysi): anatomy and phylogenetic information.
Grantee:Murilo Nogueira de Lima Pastana
Support type: Scholarships in Brazil - Master
FAPESP's process: 17/09321-5 - Miniature Characiformes (Teleostei: Ostariophysi): evolution, diversity and biogeography
Grantee:Manoela Maria Marinho Koh
Support type: BIOTA-FAPESP Program - Young Investigators Grants
Grantee:Vitor Pimenta Abrahão
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 16/19075-9 - Diversity and evolution of Gymnotiformes (Teleostei, Ostariophysi)
Grantee:Naercio Aquino Menezes
Support type: Research Projects - Thematic Grants
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 type: Scholarships in Brazil - Doctorate