天牛科雄性外生殖器的新类型——狭天牛属雄性外生殖器的研究

ON THE MALE GENITALIA OF THE GENUS STENHOMALUS (COLEOPTERA: CERAMBYCIDAE)

本文记述两种狭天牛的雄性外生殖器结构。这种结构在天牛科或叶甲总科中属于一种新类型—天牛叶甲型。与陈世骧(1987)命名的叶甲总科雄性外生殖器的四型(距甲型、茎甲型、叶甲型和肖叶甲型)相比,天牛叶甲型与距甲型或称天牛型的区别是阳基叉式,无阳基侧突,不成环形;与其它类型的区别是中茎有成对的中茎突。这一发现对探讨天牛科或叶甲总科的分类和系统发育具有重要意义。

This paper reports the male genitalia of two species of Stenhomalus. The structures of the male genitalia formed a kind of new type in Cerambycidae and/or Chrysomeloidea. A name given to this new type as the 'cerambycid-chrysomelid type'. The types of male genitalia of Chrysomeloidea should be five instead of four described by Chen in 1987 (cerambycid or me-galopodid type, sagrid type, chrysomelid type and eumolpid type). The cerambycid-chrysome-lid type is different from megalopodid in the forked tegmen instead of a annuliform with la-teral lobes and from other three types in the median lobe with a pair of median struts. This new finding will have important significance for study of the phylogeny and classfication of Cerambycidae or/and Chrysomeloidea.