Year-end Sale % OFF 
Abstract
Aphodius abdominalis Bonelli, 1812 is shown to have a karyotype comprising nine pairs of autosomes and sex chromosomes which are X0 (male), XX (female). At fi rst metaphase of meiosis the X chromosome is linked to an au- tosomal bivalent by a darkly staining area of the cytoplasm, resembling the Xy p arrangement typical of Aphodius species, but giving nine, rather than 10, ele- ments in the nucleus. C-banding, which shows the centromeres, confi rms this unusual arrangement. A. bonvouloiri, the only other known species of subge- nus Agolius Mulsant et Rey, 1869, has a male karyotype with nine pairs of auto- somes and Xy sex chromosomes. No preparations of its meiosis are available.
Highlights
IntroductionThe genus Aphodius Illiger, 1798, in the broad sense (i.e. not accepting the elevation of the subgenera to generic rank as proposed by Dellacasa et al, 2000) comprises more than 1600 species world-wide (estimate based on Dellacasa, 1987)
The genus Aphodius Illiger, 1798, in the broad sense comprises more than 1600 species world-wide
Comparison of the autosomes of A. abdominalis and A. bonvouloiri reveals a series of differences and similarities very normal when related species are considered
Summary
The genus Aphodius Illiger, 1798, in the broad sense (i.e. not accepting the elevation of the subgenera to generic rank as proposed by Dellacasa et al, 2000) comprises more than 1600 species world-wide (estimate based on Dellacasa, 1987). 65 of these species are known chromosomally (Smith, Virkki, 1978; Wilson, 2001, 2002; Wilson, Angus, 2003, 2004 a, b, 2005, 2006 a, b; Maté, Angus, 2005, and some unpublished data) and they show interesting and taxonomically useful differences between species, the general karyotypes are very uniform with 2n = 18 + Xy (♂), with the sex chromosomes showing the common Polyphagan “parachute” association (Xyp) during first division of meiosis. Yadav (1973) recorded 2n = 22 (20 + Xyp) for A. moestus (Fabricius, 1801) but Yadav et al (1993) recorded the usual number of 20 (including the sex chromosomes) for this species. Wilson and Angus (2004b) recorded up to six B-chromosomes in A. foetidus (Herbst, 1783) in addition to the normal diploid karyotype of 18 + Xyp, and suggested that the presence of B-chromosomes was the most likely explanation for the variation in chromosome number recorded for A. moestus.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
