Results 171 to 180 of about 11,717 (208)
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Origin of the chordate central nervous system – and the origin of chordates
Development Genes and Evolution, 1999Contrary to traditional views, molecular evidence indicates that the protostomian ventral nerve cord plus apical brain is homologous with the vertebrates' dorsal spinal cord plus brain. The origin of the protostomian central nervous system from a larval apical organ plus longitudinal areas along the fused blastopore lips has been documented in many ...
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2002
Abstract We next focus on one of the branches of the protostomia/deuterostomia divide. The figure shown below (p. 113) is the dendrogram or branch of the animal tree of the deuterostomia. This is the branch that includes us. As with all such dendrograms, there is some uncertainty in where they are rooted.
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Abstract We next focus on one of the branches of the protostomia/deuterostomia divide. The figure shown below (p. 113) is the dendrogram or branch of the animal tree of the deuterostomia. This is the branch that includes us. As with all such dendrograms, there is some uncertainty in where they are rooted.
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Vetulicolians—are they deuterostomes? chordates?
BioEssays, 2002AbstractA recent paper by Shu et al.(1) reinterprets the fossil Vetulicola and related forms, all from the Lower Cambrian, as basal deuterostomes, assigning them their own phylum, Vetulicolia. Their conclusion is based on the presence of structures resembling gill slits and a trunk‐like region that shows evidence of segmentation. This report summarizes
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The Patterns of Codon Usage between Chordates and Arthropods are Different but Co-evolving with Mutational Biases [PDF]
Molecular Biology and EvolutionFunding: This research was funded in part by the Austrian Science Fund (FWF) [10.55776/P34524 and 10.55776/P37050] to R.B., and Biotechnology and Biological Sciences Research Council (BBSRC) [BBW00768/1] to C.K.Different frequencies amongst codons that ...
Koichiro Tamura +2 more
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Acta Zoologica, 1973
AbstractThe study of development and comparisons of the adult structures of the several groups of protochordate animals reveals something of their interrelationships and origin. The hemichordates are perhaps closer to the echinoderms than to the chordates, but these groups appear to have been derived from a bilaterally symmetrical dipleurula ancestor ...
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AbstractThe study of development and comparisons of the adult structures of the several groups of protochordate animals reveals something of their interrelationships and origin. The hemichordates are perhaps closer to the echinoderms than to the chordates, but these groups appear to have been derived from a bilaterally symmetrical dipleurula ancestor ...
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1975
Eucoelomata in which:- 1. The body may be metamerically segmented or regionally differentiated. 2. A head is usually present, although the anterior region of the body in the Hemichordata is represented by a proboscis. 3. The gut is usually straight, U-shaped or coiled, with pharyngeal clefts. 4.
J. E. Webb, J. A. Wallwork, J. H. Elgood
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Eucoelomata in which:- 1. The body may be metamerically segmented or regionally differentiated. 2. A head is usually present, although the anterior region of the body in the Hemichordata is represented by a proboscis. 3. The gut is usually straight, U-shaped or coiled, with pharyngeal clefts. 4.
J. E. Webb, J. A. Wallwork, J. H. Elgood
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Transitional chordates and vertebrate origins: Tunicates
Current Topics in Developmental Biology, 2021Billie Swalla
exaly