corrugata. The existence of a true radula membrane and of membranoblasts and odontoblasts in neomenioids indicates that morphogenesis of the aplacophoran radula is homologous to that in other radulate Mollusca. We conclude from p redness of salivary gland ducts,Amélie H. Scheltema...
Original molluscan radula: comparisons among Aplacophora, Polyplacophora, Gastropoda, and the Cambrian fossil Wiwaxia corrugata . Journal of Morphology . 2003; 257 (2):219–244. [ PubMed ]Scheltema AH, Kerth K, Kuzirian AM. Original molluscan radula: comparisons among Aplacophora, Polyplacophora...
Wiwaxia corrugata and the indisputable polychaetes of the Middle Cambrian Burgess Shale, particularly Canadia spinosa, have figured prominently in recent hypotheses about the early evolution of polychaete annelids. Based on similarities between the sclerites of Wiwaxia and the notochaetae of Canadia ...
corrugata - are symmetrically arranged in five distinct zones. They form rows across the body, and were individually added and shed throughout growth to retain an approximately symmetrical body shape. Their development pattern suggests a molluscan affinity. The basic body plan of wiwaxiids is ...
首次报道产于我国贵州台江早,中寒武世凯里组的Wiwaxia骨片化石,讨论了Wiwaxiidae与Halkieriidae和Sachitidae不能归属于同一科,也不能将它与Siphogonuchitidae和Chancelloriidae归于同一纲,目,它的分类位置尚不能确定.通过对新种Wiwaxiataijiangensis的描述和讨论,指出了描述种产出的层位略低于北美的W.corrugata...