Karyotype and male reproductive system in Arachnocoris trinitatus Bergroth. First data on the tribe Arachnocorini (Heteroptera: Nabidae: Nabinae). Folia Biologica (Kraków)
Date
2007
Journal Title
Journal ISSN
Volume Title
Publisher
Folia biologica (Kraków)
Abstract
As an extension of the ongoing cytogenetic studies of the bug family Nabidae (Heteroptera:Cimicomorpha), the first evidence for the tribe Arachnocorini (the subfamily Nabinae), with reference to the Trinidad endemic, Arachnocoris trinitatus Bergroth, is provided. This is an attempt to gain a better insight into the evolution, systematics and within-family relationships of the family Nabidae. The studies were conducted using a number of
cytogenetic techniques. The male karyotype (chromosome number and size; sex
chromosome system; NOR location; C-heterochromatin amount, distribution and
characterization in terms of the presence of AT-rich and GC-rich DNA), and male meiosis
with particular emphasis on the behavior of the sex chromosomes in metaphase II are
described. Also investigated are the male and female internal reproductive organs with
special reference to the number of follicles in a testis and the number of ovarioles in an ovary. A. trinitatus was found to display a number of characters differentiating it from all hitherto studied nabid species placed in the tribe Nabini of the subfamily Nabinae, and in the tribe Prostemmatini of the subfamily Prostemmatinae. Among these characters are chromosome number 2n = 12 (10 + XY), the lowest within the family, nucleolus organizer regions (NORs)situated on the autosomes rather than on the sex chromosomes as is the case in other nabid
species, and testes composed of 3 follicles but not of 7 as in other nabids. All the data obtained suggest many transformations during the evolution of A. trinitatus.
Description
(for V. G. Kuznetsova)
by the Russian Foundation for Basic Research,
Grant No. 05-04-48387, the program of the Presidium of the Russian Academy of Sciences “Dynamics of Gene Pools in Animals, Plants and Man”, the
program of the St. Petersburg Scientific Centre of
the Russian Academy of Sciences “The Divergence of Genetic Material in the Evolution of Phylogenetic Branches of Eukaryotes”, and (for S.
Grozeva) by the National Science Fund, Bulgarian
Ministry of Education and Science, Grant B-1304.
The study was also supported by the Russian
Academy of Sciences, the Bulgarian Academy of
Sciences and the Academy of Finland.
Table of Contents
Keywords
Heteroptera, Nabidae, Arachnocorini, Arachnocoris trinitatus, karyotype, C-heterochromatin, NOR, CMA3, DAPI, meiosis, internal reproductive organs, evolution, karyosystematics