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Cytotaxonomic studies of Encarsia Förster (Hymenoptera: Aphelinidae)

Published online by Cambridge University Press:  09 March 2007

F. Baldanza ,
L. Gaudio  and
G. Viggiani
F. Baldanza*
Affiliation:
Dipartimento di Entomologia e Zoologia agraria, Università di Napoli, via Università 133, 80055 Portici Napoli, Italy
L. Gaudio
Affiliation:
Dipartimento di Genetica, Biologia Generale e Molecolare, Università di Napoli, via Mezzocannone 8, I-80134 Napoli, Italy
G. Viggiani
Affiliation:
Centro CNR Tecniche di Lotta Biologica (CETELOBI), via Università 133, 80055 Portici, Napoli, Italy
*
* Fax: 0039 08 775 36 58 E-mail: cslb@saul.iabbam.na.cnr.it
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Abstract

A cytotaxonomic study was carried out on 13 species of Encarsia Förster, known to parasitize aleyrodids and diaspidids. The chromosomes varied greatly both in number and morphology, with E. protransvena Viggiani having the lowest chromosome number (2n = 6) and E. asterobemisiae Viggiani & Mazzone the highest (2n = 20). The most common chromosome number was 2n = 10. C-banding, G-banding and silver staining for nucleolar organizer regions (NOR) provided the possibility of distinguishing between karyotypes with the same chromosome number and morphology and to identify all the pairs of homologues in a diploid set for advanced cytogenetic studies. The karyotype of Coccophagus lycimnia (Walker) was also examined. The chromosome data suggested that in Encarsia, karyotype differentiation has mainly occurred through a series of centric fusions, although other rearrangements may also have been significant. The importance of karyological data in systematic studies and in the identification of biotypes and cryptic species of economic interest is outlined.

Type
Review Article
Information
Bulletin of Entomological Research , Volume 89 , Issue 3 , March 1999 , pp. 209 - 215
Copyright
Copyright © Cambridge University Press 1999

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