How To Use Nemertea In A Sentence
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Consequently, his conclusion that platyhelminths, nemerteans, and rotifers ‘appear to have never had’ a prototroch is not supported by his analysis.
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Such an association of cells and mechanism of precursor translocation have not been reported from nemerteans previously.
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Frontal glands have been cited in the classical literature as probable homologues of Platyhelminthes and nemerteans.
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Phylum Nemertea contains about 1,150 species of unsegmented worms that possess an eversible proboscis contained in a fluid-filled cavity or rhynchocoel.
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The focal stage for this analysis is the early period of embryo encapsulation, a mode of development that has evolved several times among gastropods, polychaetes, nemerteans and flatworms.
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In contrast to platyhelminths, nemerteans possess a circulatory system, comprised of fluid-filled, cell-lined channels situated between the gut and body-wall musculature.
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Classical studies revealed that nemertean embryos exhibit spiral cleavage and that the mouth forms at or near the site of the blastopore, but aspects of cell lineage, especially origin of the mesoderm, proved problematic.
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The organization of the body compartment between the epidermis and gut in nemerteans and flatworms also does not reveal a uniquely similar pattern.
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Most nemerteans found in San Francisco Bay are very small and not easily identifiable.
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The focal stage for this analysis is the early period of embryo encapsulation, a mode of development that has evolved several times among gastropods, polychaetes, nemerteans and flatworms.
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Of the phyla you haven't seen alive, I have seen: Chaetognatha, Nematomorpha, Nemertea, Sipuncula, Echiura which is really a subgroup of Annelida, Phoronida and Brachiopoda.
So many phyla so little time
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Phylum Nemertea contains about 1,150 species of unsegmented worms that possess an eversible proboscis contained in a fluid-filled cavity or rhynchocoel.
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Some recent investigations of nemertean development have contributed informative characters for phylogenetic analysis, whereas others have provided insight into developmental mechanisms and patterns.
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He also concluded that nemerteans, platyhelminths, and rotifers never had a prototroch.
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Although long considered a character informative for linking nemerteans and platyhelminths, rigorous comparative analyses of protonephridial morphology have revealed no synapomorphies of nemertean and platyhelminth nephridia.
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In hetero- and hoplonemerteans investigated there is an ECM layer situated between the vessel lining mesothelium and underlying muscle, which may be part of the general body-wall musculature or an intrinsic musculature.
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A common modification occurring in many hetero- and hoplonemerteans is a dorsal vessel and transverse connectives.
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Of the phyla you haven't seen alive, I have seen: Chaetognatha, Nematomorpha, Nemertea, Sipuncula, Echiura which is really a subgroup of Annelida, Phoronida and Brachiopoda.
So many phyla so little time
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It is of course possible that Rouse's decision to score platyhelminths, nemerteans, and rotifers as lacking a prototroch is defendable, and perhaps even preferable over scoring them as possessing a prototroch.
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Historically, the focus of most research on developmental biology of nemerteans was limited to descriptive and experimental embryology and larval development.
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It supports a number of unlikely associations - entoprocts with nemerteans, phoronid with annelids, and pogonophorans with gastropod mollusks.
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The phylogenetic position of nemerteans remains controversial.
