Sperm morphology in four species of African platypleurine cicadas (Hemiptera: Cicadomorpha: Cicadidae)

Chawanji, A.S. and Hodgson, A.N. and Villet, M.H. (2005) Sperm morphology in four species of African platypleurine cicadas (Hemiptera: Cicadomorpha: Cicadidae). Tissue and Cell, 37 (4). pp. 257-267. ISSN 0040-8166

[img]
Preview
Text
Sperm_morphology_in_four_species_of_African_platypleurine_cicadas.pdf

1190Kb

Official URL: http://dx.doi.org/10.1016/j.tice.2005.03.006

Abstract

Mature spermatozoa from four species of platypleurine cicadas (Albanycada albigera, Azanicada zuluensis, Platypleura capensis and P. hirtipennis) were examined by light and electron microscopy. The filiform sperm have a similar ultrastructure in all species but notable variations were found in sperm dimensions. All species produce more than one discrete length of nucleated, motile sperm, a form of polymorphism termed polymegaly. Polymegaly is expressed in two ways: sperm have bi- or trimodal head and tail lengths. The anterior parts of sperm heads are embedded in an elongate homogenous matrix forming a spermatodesm. The conical acrosome is deeply invaginated posteriorly, and sits on top of the nucleus. The acrosomal contents are differentiated internally with an electron-lucent central medulla and a denser cortex. The homogenously electron-dense nucleus is pointed anteriorly and is generally cylindrical, although posteriorly there is a lateral invagination that extends part-way along the nucleus. This invagination houses fine granular material of the centriolar adjunct. Vesicle-like elements that are associated with both the posterior nucleus and the centriolar adjunct are also found within the invagination. Immediately posterior of and adjoining the centriolar adjunct is a pair of mitochondrial derivatives that are elongated and extend for almost the entire length of the tail. The absence of accessory bodies in cicada sperm suggests that within the Cicadomorpha, the families Cicadidae and Cercopidae are closely affiliated.

Item Type:Article
Uncontrolled Keywords:Acrosome; Polymegaly; Spermatodesm; Centriolar adjunct
Subjects:Y Unknown > Subjects to be assigned
Divisions:Faculty > Faculty of Science > Zoology & Entomology
ID Code:369
Deposited By:INVALID USER
Deposited On:13 Oct 2006
Last Modified:06 Jan 2012 16:18
429 full-text download(s) since 13 Oct 2006
69 full-text download(s) in the past 12 months
More statistics...

Repository Staff Only: item control page