Hemichordate - Wikipedia
The body plan of hemichordates is characterized by a muscular organization. The anteroposterior axis is divided into three parts: the anterior prosome, the intermediate mesosome, and the posterior metasome.
Evolution of the chordate body plan: New insights from ... - PNAS
2000年4月25日 · Careful analysis of a new 18S rDNA data set indicates that deuterostomes are composed of two major clades: chordates and echinoderms + hemichordates. This analysis strongly supports the monophyly of each of the four major deuterostome taxa: Vertebrata + Cephalochordata, Urochordata, Hemichordata, and Echinodermata.
Hemichordate neurulation and the origin of the neural tube
2013年11月1日 · Hemichordates, together with echinoderms, and possibly Xenacoelomorpha are the sister group of chordates 10. Compared with the highly specialized radial form of the body plan of extant...
Cambrian Tentaculate Worms and the Origin of the Hemichordate Body Plan ...
2020年11月2日 · Our phylogenetic analyses retrieve this new taxon as a stem-group hemichordate, supporting the hypothesis that a vermiform body plan preceded both tube building and colonial ecologies. This new taxon suggests that a bimodal feeding ecology using tentacles to filter feed and a proboscis to deposit feed may be plesiomorphic in hemichordates.
Hemichordata - an overview | ScienceDirect Topics
Hemichordates are deuterostome animals with bilateral body plans based on three developmental features: radial, indeterminate cell cleavage in the early embryo, enterocoelous formation of the body cavity, and a blastopore that forms the anus.
The Adult Body Plan of Indirect Developing Hemichordates ... - PubMed
2017年1月9日 · We describe the expression of 27 transcription factors with conserved roles in deuterostome ectodermal anteroposterior (AP) patterning in developing embryos, tornaria larvae, and post-metamorphic juveniles and show that the tornaria larva of S. californicum is transcriptionally similar to a truncated version of the adult.
Hemichordate cis -regulatory genomics and the gene expression
2024年10月18日 · Indirect development of hemichordates, with larval phases similar to echinoderms and an adult body plan with an anteroposterior polarity like chordates and other bilaterians, makes them a...
Building divergent body plans with similar genetic pathways
2006年7月26日 · Deuterostome animals exhibit widely divergent body plans. Echinoderms have either radial or bilateral symmetry, hemichordates include bilateral enteropneust worms and colonial pterobranchs, and...
Hemichordate models - ScienceDirect
2016年8月1日 · Hemichordates are deuterostome animals with bilateral body plans based on three developmental features: radial, indeterminate cell cleavage in the early embryo, enterocoelous formation of the body cavity, and a blastopore that forms the anus.
Hemichordata | Structure and Evolution of ... - Oxford Academic
Hemichordates consist of the two exclusively marine taxa, Pterobranchia (angelwings) and Enteropneusta (acorn worms). All hemichordates feature three body parts: the prosome, the mesosome, and the metasome. The major part of the nervous system in both hemichordate groups comprises a plexus.
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