Department of Animal Taxonomy and Ecology, Faculty of Biology, A. Mickiewicz University, Umultowska 89, 61-614 Poznań, Poland.
Arthropod Struct Dev. 2013 May;42(3):185-96. doi: 10.1016/j.asd.2013.02.002. Epub 2013 Feb 20.
The pedicel is a structure that connects the phoretic deutonymph of Uropodina mites with its carrier and enables dispersal. The shapes, lengths and diameters of pedicels formed by Uropoda orbicularis, Trichouropoda ovalis, Uroobovella pulchella and Uroobovella nova were studied by scanning and light microscopy. Pedicels of U. orbicularis and T. ovalis have the shape of a straight stalk. In U. pulchella, the pedicel is extremely short, irregularly shaped and composed of homogeneous material. The longest pedicel is found in U. nova and it may be helically coiled in this species. The length of the pedicel is positively correlated with deutonymph body size between species, but not within species. Pedicels of U. orbicularis and U. pulchella have the largest diameter. The pedicel diameter in U. orbicularis and T. ovalis is inversely proportional to its length, but not in U. nova and U. pulchella. The constituent of pedicel stems in U. pulchella is homogeneous, whereas in U. orbicularis and T. ovalis it contains a bundle of tightly packed fibres. In U. nova coiled pedicels are comprised of two layered materials of different electron density, one of which is electron lucid and located peripherally. Hypotheses on the origin of the pedicel are proposed.
柄节是连接游猎幼体和载体并使其能够散布的结构。通过扫描和光学显微镜研究了球形游猎螨、卵形游猎螨、秀丽游猎螨和新游猎螨的柄节的形状、长度和直径。球形游猎螨和卵形游猎螨的柄节呈直柄状。秀丽游猎螨的柄节极短，形状不规则，由同质材料组成。在新游猎螨中，柄节最长，在该物种中可能呈螺旋状卷曲。柄节的长度与种间幼体体型呈正相关，但与种内无关。球形游猎螨和秀丽游猎螨的柄节直径最大。球形游猎螨和卵形游猎螨的柄节直径与其长度成反比，但在新游猎螨和秀丽游猎螨中则不然。秀丽游猎螨柄节的组成物质均一，而球形游猎螨和卵形游猎螨的柄节则包含一束紧密排列的纤维。在新游猎螨中，卷曲的柄节由两种不同电子密度的材料组成，其中一种电子透明，位于外周。提出了柄节起源的假说。
