Karyotype analysis of Phauloppia lucorum (Koch, 1841) (Oribatida: Oribatulidae)

Abstract

Currently, about 11,000 oribatid mites have been described, but chromosome numbers have been reported for only a few species. Furthermore, the oribatid mites are a valuable model for holocentric chromosomes in cytogenetic studies. The diploid chromosome number is generally 2n = 18 in oribatid mites, though some have 2n = 16 or 30. Although there are many studies on the morphology and systematics of Phauloppia lucorum (Koch, 1841) (Oribatida: Oribatulidae), there is no information about its karyotype or chromosome numbers. The aim of this study is to investigate the chromosome number, monoploid ideogram and detailed chromosomal measurements of P. lucorum. The diploid chromosome number of P. lucorum was found to be 2n = 12. The total haploid chromosome length and the average chromosome length were 7.39 µm and 1.23 µm respectively. The chromosome lengths varied from 0.91 to 1.67 µm. In conclusion, these results are the first for the chromosome numbers and karyotype analysis for P. lucorum.

Karyotype analysis of two oribatid mite species (Acari: Oribatida)

“…Eroğlu and Per (2016) reported that the chromosome number is 2n = 30 in Zygoribatula cognata Oudemans, 1902. In addition, the diploid number is 2n = 12 in Phauloppia lucorum Koch, 1841 (Gümüş et al, 2018).…”

“…In Oribatida, Eroğlu and Per (2016) reported that Z. cognata has small holocentric chromosomes (range 0.46-1.30 µm). In addition, holocentric chromosomes vary from 0.91 to 1.67 µm in P. lucorum (Gümüş et al, 2018). Holocentric chromosomes have some advantages.…”

“…In this respect, the results of the study provide important contributions to the cytotaxonomy of oribatid mites. Because studies on oribatid mites are very few and limited to a few reports (Norton et al, 1993;Heethoff et al, 2006;Eroğlu and Per, 2016;Gümüş et al, 2018). We think that the main reasons for the limited number of such studies are due to the organism and the method.…”

“…In addition, oribatid mites are a valuable model for holocentric chromosomes in cytogenetic studies. Generally, the number of diploid chromosomes in oribatid mites is 2n = 18, though some have 2n = 16 and 30 (Oliver, 1977;Norton et al, 1993;Eroğlu and Per, 2016;Gümüş et al, 2018). Although there are numerous morphological and systematic studies on Hermanniella gibber Kulijev and Oribotritia hermanni Grandjean, there is no information about their karyotype and chromosome number.…”