Caracterização da morfologia externa de fetos de Paca

Abstract

The present scientific investigation aimed to study the embryonic development of pacas (Agouti Paca), with a view to the external morphological description of fetuses. Five fetuses were used, three of which were donated from the donation maintained by the Faculty of Agricultural and Veterinary Sciences of Jaboticabal - UNESP and two donated from the collection of biological material from FMVZ - USP. Fetuses 1 and 2 with 5.7 and 6.8 cm of Crow Rump, respectively, presented as morphological characteristics: marked facial immaturity, with the eyes covered by a prominent lens; the earlobes had a low level of development. The mouth had a small opening, where the formation of the incisor teeth was observed. Fetuses 3 and 4 with 9.6 and 10.5 cm of Crow Rump, respectively, showed well-developed ears, thoracic and pelvic limbs were in an equal degree of development with the presence of claws and development of facial features, like vibrissae around the nasal edges, the eyes remain protected by a prominent lens and the mouth contained the incisor teeth in an intermediate stage of development. Fetus 5, with 15.5 cm of Crow Rump, presented as a striking feature, the body covered by hair, thoracic and pelvic limbs in an equal degree of development with claws, development of facial characteristics, such as vibrissae, prominent eyes and well-developed ears. In all fetuses, the genital tubercle and the anal rim can be seen in the perineal region.