The Homonymy of Xishania with reference to Xishania Fusiformis Hong, 1981 and X. Longiusula Hu, 2002
摘要
The name Xishania fusiformis Hong, 1981 was established for an Early Cretaceous insect from the Lushangfen Formation of western Beijing. In this paper, the authors compare it with Mesolygaeus laiyangensis Ping, 1928, also from Early Cretaceous strata and which has a similar habit and also other characters such as three-segmented tarsi having an extremely short first tarsomere. The new evidence (Huang, 2005; Liu et al., 2006) shows that the original description was in the reverse of the correct orientation. Therefore, X. longiusula is a very elongate worm that had a small head having a pair of antennae and with 5 pairs of long anterior appendages bearing setae. The trunk was covered with annulations, swollen posteriorly, armed with a few rows of circlet hooks, and had an anal cone.
