Banca de DEFESA: PILAR COZENDEY SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : PILAR COZENDEY SILVA
DATA : 31/05/2019
HORA: 13:00
LOCAL: Sala 34 do icbs
TÍTULO:

STUDY OF THE RELATIONSHIP BETWEEN MORPHOLOGICAL ASPECTS OF TONGUES OF SIXTEEN SPECIES OF LIZARDS OCCURRING IN BRAZIL AND THEIR RESPECTIVE
TYPES OF FORAGING

PALAVRAS-CHAVES:

tongue; Squamata; scanning electron microscopy; taste buds;

PÁGINAS: 84
GRANDE ÁREA: Ciências Biológicas
ÁREA: Morfologia
SUBÁREA: Histologia
RESUMO:

The Squamata reptiles have a sophisticated sensory system, frequently adapted to the
environment in which they live and the activities performed in their foraging. The
tongue lizards is a fundamental structure of the sensory system for foraging. Thus, this
study sought investigate the morphological and histological tongue structure of 16
species of Brazilian lizards and its relationship with ambush and active foraging. For
that, were analyzed the shape and elongation and made histological slides of tongues
specimens of the 16 species and colored by HE, PAS, Alcian Blue and Gomori Trichome.
Scanning electron microscopy of the languages of 13 species was made. The tongue of
all species showed stratified squamous keratinized epithelium, with the keratin layer
varying in thickness and position in the tongue and also scale-like papillae, filiform
papillae. Teiidae and Gymnophtalmidae lizards showed the most specialized tongue
and restricted to wile foraging, while Leiosauridae, Gekkonidae, Polychrotidae and
Tropiduridae lizards presented tongue with less favorable to tongue-flicking and
therefore closest to ambush foraging structure. Mabuydae and Anguidae lizards
species showed characteristics of both foraging types, showing a probable plasticity
between the extremes of wile and ambush foraging. This fluctuation between types of
foraging has been observed within the old genus Mabuya from previous studies that
indicate that factors such as food availability and habitat changes are able to alter the
dynamics of some species foraging. In this study it was possible to relate aspects such
as types of papillae, tongue shape, muscular arrangement, keratin layer, among
others, with the possible dynamics of foraging the 16 species. The muscle arrangement
found in active foragers was considered more compact and focused for the tongue-
flicking, while the ambush foragers muscle arrangement shown less restricted. And
stand out from other factors such as the presence of taste buds. The analysis of
external and microscopic characteristics of the tongue provided great contributions to
the understanding of how the lizard optimizes its environment perception, as realize
the time and its energy expenditure. Also contributes with more information about the
morphology and ecology of species occurring in Brazil.

MEMBROS DA BANCA:
Externo ao Programa - 3377607 - APARECIDA ALVES DO NASCIMENTO
Interno - 164.050.567-91 - ARMANDO SALES - UFRRJ
Externo à Instituição - CLARICE MACHADO DOS SANTOS
Externo ao Programa - 2142679 - LEILANE MARIA BARCELLOS NEPOMUCENO
Externo à Instituição - OSCAR ROCHA BARBOSA