Banca de DEFESA: CARLOS NEI ORTÚZAR FERREIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : CARLOS NEI ORTÚZAR FERREIRA
DATE: 30/09/2024
TIME: 13:00
LOCAL: Sala 34
TITLE:

Taxonomy and Systematics of Tyzzeria Allen, 1936 (Chromista: Apicomplexa): characterization of morphotypes and phylogenetic position of the genus based on molecular evidence

KEY WORDS:

parasitology, coccidia, Anseriformes, phylogeny, diversity

PAGES: 70
BIG AREA: Ciências Biológicas
AREA: Zoologia
SUBÁREA: Zoologia Aplicada
SUMMARY:

Issues related to the taxonomy and systematics of coccidia still have many
issues to be resolved, both in terms of surveying the biodiversity of these parasites and in
the phylogenetic organization of their taxa. Tyzzeria Allen, 1936 remains to this day as
one of the few groups of coccidia without its genetic characterization deposited in
GenBank. Furthermore, its current classification within the family Eimeriidae Minchin,
1903 is questionable. In this work, we present four morphotypes of this coccidia
recovered from fecal samples of domestic and wild birds (Anseriformes: Anatidae) from
Brazil. Morphotype 1 presented subspherical oocysts measuring 13.5 x 12.0 μm,
morphometric index of 1.1 μm, double and smooth wall with a thickness of 1.0 μm.
Morphological morphotype 2 presented ellipsoidal oocysts measuring 13.6 x 10.4 μm,
morphometric index of 1.3 μm, double, smooth and thin wall with a thickness of 0.8 μm.
Morphological morphotype 3 presented ellipsoidal oocysts measuring 14.5 x 11.7 μm,
morphometric index of 1.2 μm, double, thick and slightly rough wall, with a thickness of
1.1 μm. Morphological morphotype 4 presented ellipsoidal oocysts measuring 14.7 x 11.2
μm, morphometric index of 1.3 μm, double, thick and very rough wall, with a thickness
of 1.4 μm. Taking into account the sample number of oocysts analyzed,
morphological/morphometric parameters, sequencing performed and aspects of parasite
specificity in the host; only morphotype 1 could be identified, which was consistent with
Tyzzeria parvula (Kotlán, 1933) Klimeš, 1963. Its oocysts were then isolated and
sequenced. Here, the first molecular characterization of the genus (from oocysts of this
species) is provided, and phylogenetic analyses demonstrate that this coccidian genus is
closely related to Schellackia Reichenow, 1919, and other amphibian eimerids.

COMMITTEE MEMBERS:
Interno - 1971595 - BRUNO PEREIRA BERTO
Externa ao Programa - 1764496 - VIVIANE MOREIRA DE LIMA - UFRRJExterno à Instituição - CARLOS WILSON GOMES LOPES - UFRRJ
Externo à Instituição - SERGIAN VIANNA CARDOZO - Unigranrio
Externo à Instituição - THIGO FERNANDES MARTINS - USP