Spermatogenesis,sperm cell morphology and accompanying secretions from two interstitial marine mites |
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| Authors: | Almir R. Pepato Marta M. Antoniazzi Carlos Jared |
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| Affiliation: | 1. Laboratório de Sistemática e Evolu??o de ácaros Acariformes, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil;2. Laboratório de Biologia Celular, Instituto Butantan, S?o Paulo, Brazil |
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| Abstract: | The sperm cell morphology and spermatogenesis of Halacaroides antoniazziae Pepato Tiago and da Rocha 2011 and Acaromantis vespucioi Pepato and Tiago 2004 was investigated. Halacaroides sperm cells have a complete acrosomal complex, dense tubules crossing the cytoplasm and modified mitochondria. Mature sperm cells are surrounded by two kinds of secretions. Inside the ejaculatory duct, they lie upon a centre composed of a secretion structured as heaps of elongated bodies. Acaromantis spermatozoa are spindle shaped and lack an acrosomal complex. The plasmalemma is deeply folded; the cytoplasm is very reduced and devoid of organelles. A single kind of globular secretion was found. The sperm mass is surrounded by two layers of amorphous secretions. These species share a peripheral pattern of nuclear condensation during spermatogenesis, a possible apomorphy for most halacarids, and no special adaptation to the interstitial environment could be related to their sperm cell morphology. |
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| Keywords: |
Halacaroides
Acaromantis
Halacaridae spermiogenesis spermatology |
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