Hubweber Lasse, Schmitt Michael
Zoologisches Forschungsmuseum Alexander Koenig, Bonn, Germany.
Genetica. 2010 Jan;138(1):37-43. doi: 10.1007/s10709-009-9403-x.
Beetle genitalia are usually described only for taxonomic purposes without considering the possible function of structures. Exceptions are sporadic detailed studies on single species. We studied genital structures in the subfamilies of Cerambycidae and outlined assumptions on the function of these structures and the implications for the phylogeny of the Cerambycidae. We found that male genitalia in particular are taxon-specific on a higher taxonomic level; e.g., the parameres are widely variable in Cerambycinae, while in most Lamiinae species they appear relatively uniform and differ from those of the Cerambycinae. Internal sac structures are very different among the various subfamilies. Small backwards-pointing spines are the most common armature of the internal sac. The female genitalia are less variable, although ovipositor morphology may differ among subfamilies. In most species, the connection between the mates during copulation is achieved by the long internal sac and the ovipositor only, whereas the median lobe and parameres are in contact with the female abdomen only at the beginning of copulation. Cerambycinae and Lepturinae have a basal swelling of the endophallus to prevent it from sliding back into the male abdomen during copulation. The long internal sac functions in connecting the mates and guaranteeing the sperm transfer.
通常描述甲虫生殖器只是出于分类学目的，而不考虑结构的可能功能。例外情况是对单个物种进行的零星详细研究。我们研究了天牛科亚科的生殖器结构，并概述了关于这些结构功能的假设以及对天牛科系统发育的影响。我们发现，特别是雄性生殖器在较高分类水平上具有分类群特异性；例如，阳茎侧叶在天牛亚科中变化很大，而在大多数沟胫天牛亚科物种中它们看起来相对统一，并且与天牛亚科的不同。内囊结构在各个亚科之间差异很大。小的向后指向的刺是内囊最常见的结构。雌性生殖器变化较小，尽管产卵器形态在亚科之间可能有所不同。在大多数物种中，交配时配偶之间的连接仅通过长的内囊和产卵器实现，而中叶和阳茎侧叶仅在交配开始时与雌性腹部接触。天牛亚科和瘦天牛亚科有阳茎基部肿胀，以防止其在交配时滑回雄性腹部。长的内囊在连接配偶和保证精子转移方面起作用。
