Several strains of the apparently well-known cosmopolitan synanthropic parasitoid of coleopteran stored-product pests, Lariophagusdistinguendus (Förster, 1841) from Western Europe, were studied using DNA sequencing and chromosomal analysis. The presence of at least two cryptic species with different COI sequences and chromosome numbers (n = 5 and 6) was supported. The species with n = 6 is associated with the drugstore beetle Stegobiumpaniceum (Linnaeus, 1758), whereas the other one with n = 5 mostly develops on the granary weevil Sitophilusgranarius (Linnaeus, 1758). A phylogenetic study revealed that the karyotype with n = 6 represents an ancestral character state in this complex. Consequently, the chromosome set with n = 5 which is characteristic of a particular internal clade, apparently originated via chromosomal fusion which was probably preceded by a pericentric inversion. If this is true, inverted chromosome segments could accumulate a number of genetic loci responsible for certain interspecific differences.

中文翻译：

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Lariophagusdistinguendus（福斯特，1841）物种复合体（膜翅目，翼手龙科）内的分子和细胞遗传学分化。

使用DNA测序和染色体分析方法研究了几种看似著名的鞘翅目储藏物害虫的大都会同胞拟寄生寄生虫，拉西奥古斯·迪辛杜恩德斯（Fario，1841年）。支持存在至少两个具有不同COI序列和染色体编号（n = 5和6）的隐性物种。n = 6的物种与药房甲虫Stegobiumpaniceum（Linnaeus，1758）有关，而另一种n = 5的物种主要在粮象鼻虫Sitophilusgranarius（Linnaeus，1758）上发育。系统发育研究表明，n = 6的核型代表该复合体的祖先特征状态。因此，n = 5的染色体组是特定内部进化枝的特征，显然是由于染色体融合所致，而染色体融合可能先于周向反转。如果这是真的，倒染色体片段可能会积累许多导致某些种间差异的遗传基因座。