Halanych K M, Bacheller J D, Aguinaldo A M, Liva S M, Hillis D M, Lake J A
Department of Zoology, University of Texas, Austin 78712.
Science. 1995 Mar 17;267(5204):1641-3. doi: 10.1126/science.7886451.
The suspension-feeding metazoan subkingdom Lophophorata exhibits characteristics of both deuterostomes and protostomes. Because the morphology and embryology of lophophorates are phylogenetically ambiguous, their origin is a major unsolved problem of metazoan phylogenetics. The complete 18S ribosomal DNA sequences of all three lophophorate phyla were obtained and analyzed to clarify the phylogenetic relationships of this subkingdom. Sequence analyses show that lophophorates are protostomes closely related to mollusks and annelids. This conclusion deviates from the commonly held view of deuterostome affinity.
以悬浮物为食的后生动物总门触手冠动物既具有后口动物的特征，也具有原口动物的特征。由于触手冠动物的形态学和胚胎学在系统发育上不明确，它们的起源是后生动物系统发育学中一个主要的未解决问题。获取并分析了所有三个触手冠动物门的完整18S核糖体DNA序列，以阐明该总门的系统发育关系。序列分析表明，触手冠动物是与软体动物和环节动物密切相关的原口动物。这一结论偏离了普遍认为的与后口动物亲缘关系的观点。
