[MARMAM] recent paper on Amazonian manatee spermatozoa

Rodrigo Amaral rsamaral at gmail.com
Wed Dec 15 04:36:26 PST 2010

Dear Colleagues,

I am pleased to announce the following paper recently published in ZOOLOGIA.
Morphology, morphometry and ultrastructure of the Amazonian manatee
(Sirenia: Trichechidae) spermatozoa
*Rodrigo S. Amaral, Carolina M. Lucci, Fernando C.W. Rosas, Vera M.F. da
Silva, Sônia N. Báo*
Vol. 27(6):1014-1017. 2010.

This study describes the morphological, morphometric and ultrastructural
characteristics of the Amazonian manatee *Trichechus inunguis* (Natterer,
1883) spermatozoon. The spermatozoa were obtained from a urine sample of an
adult *T*. *inunguis* kept in captivity. The spermatozoa were analyzed by
light and transmission electron microscopy. The head of Amazonian manatee
spermatozoa had a flat oval shape and a well distinguishable midpiece. The
mean dimensions of the spermatozoa were: head length, 7.49 ± 0.24 µm; head
width, 3.53 ± 0.19 µm; head thickness, 1.61 ± 0.13 µm; midpiece length,
11.36 ± 0.34 µm; flagellum length, 40.91 ± 1.94 µm; total tail length, 52.16
± 1.06 µm; total spermatozoon length, 60.08 ± 1.40 µm. The Amazonian manatee
spermatozoa were similar in shape to other sirenian spermatozoa; however,
presenting a different size. This study describes, for the first time, the
morphometric and ultrastructural characteristics of the Amazonian manatee
spermatozoa, and also demonstrates the possible use of spermatozoa retrieved
from urine samples for biological studies.
KEY WORDS. Anatomy; reproduction; sirenians; spermatozoon; Trichechus

This article is now available online at:
or upon request; please email rsamaral at usp.br

Best regards,

Rodrigo Amaral

Rodrigo de Souza Amaral., M.V., M.Sc.
Laboratório de Dosagens Hormonais - LDH
Faculdade de  Medicina Veterinária e Zootecnia - FMVZ
Universidade de São Paulo - USP
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