2025年2月12日 · The early stages of chordate development show features shared with some invertebrate phyla, especially the mouth that forms separately from the anus, as it does in the phyla Hemichordata, Echinodermata, and Chaetognatha. Likewise, as in these phyla, the coelom, or

The name "chordate" comes from the first of these synapomorphies, the notochord, which plays a significant role in chordate body plan structuring and movements. Chordates are also bilaterally symmetric, have a coelom, possess a closed circulatory system, …

2000年4月25日 · Chordata is composed of three subphyla, Vertebrata, Cephalochordata (Branchiostoma), and Urochordata (Tunicata). Careful analysis of a new 18S rDNA data set indicates that deuterostomes are composed of two major …

2024年8月10日 · Chordates (Phylum Chordata) is the group that includes vertebrates (animals with backbones, including humans), but also includes some invertebrates. These non-vertebrate chordates include a wide diversity of forms, some of which are extremely abundant in the oceans.

2007年5月9日 · Molecular studies of tunicate development show that genetic programmes for early embryonic patterning can change radically during evolution, without completely disrupting the basic chordate body...

2024年10月28日 · Invertebrate Chordates. While vertebrates often capture the spotlight, invertebrate chordates offer insights into the early evolutionary stages of this phylum. These organisms, lacking a backbone, still possess key chordate features such as a notochord and a dorsal nerve cord, albeit in simpler forms.

2010年8月26日 · Invertebrate Chordates. In addition to the vertebrates, the phylum Chordata contains two clades of invertebrates: Urochordata (tunicates) and Cephalochordata (lancelets). Members of these groups possess the four distinctive features of chordates at some point during their development. The tunicates (Figure 4) are also called sea squirts. The ...

2 天之前 · E. Segmented Body Plan: Chordates often exhibit some form of segmentation, especially in muscles, bones, and nerves. This allows for more coordinated movement and complexity in the body structure. 3. Subphyla of Chordata: The phylum Chordata is divided into three subphyla, which represent the major groups of chordates:

2024年7月8日 · We reveal a myomere configuration intermediate between amphioxus and vertebrates and establish morphological links between Yunnanozoon, Pikaia, and uncontroversial chordates. In this light, we perform a new phylogenetic analysis, using a revised, comprehensive deuterostome dataset, and establish a chordate stem lineage.

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