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- Title
The sperm of Hexagenia ( Pseudeatonica) albivitta Walker ( Ephemeroptera: Fossoriae: Ephemeridae).
- Authors
Brito, Pedro; Mancini, Karina; Salles, Frederico Falcão; Rizzi, Evandro Apolinario; Dolder, Heidi
- Abstract
This study describes the sperm morphology of the mayfly Hexagenia ( Pseudeatonica) albivitta ( Ephemeroptera). Its spermatozoon measures approximately 30 μm of which 9 μm corresponds to the head. The head is composed of an approximately round acrosomal vesicle and a cylindrical nucleus. The nucleus has two concavities, one in the anterior tip, where the acrosomal vesicle is inserted and a deeper one at its base, where the flagellum components are inserted. The flagellum is composed of an axoneme, a mitochondrion and a dense rod adjacent to the mitochondrion. A centriolar adjunct is also observed surrounding the axoneme in the initial portion of the flagellum and extends along the flagellum for at least 2 μm, surrounding the axoneme in a half-moon shape. The axoneme is the longest component of the flagellum, and it follows the 9+9+0 pattern, with no central pair of microtubules. At the posterior region of the flagellum, the mitochondrion has a dumb-bell shape in cross sections that, together with the rectangular mitochondrial-associated rod, is responsible for the flattened shape of the flagellum. An internal membrane is observed surrounding both mitochondrion and its associated structure.
- Subjects
HEXAGENIA; MAYFLIES; INSECTS; CELL nuclei; EPHEMERIDAE
- Publication
Acta Zoologica, 2015, Vol 96, Issue 2, p160
- ISSN
0001-7272
- Publication type
Article
- DOI
10.1111/azo.12063