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- W1007809339 abstract "An earlier hypothesis concerning the origin of chaetognaths from protoconodonts found additional support in new dis− coveries and in recent structural, chemical and molecular investigations. The new findings show that the head armature of protoconodonts was composed not only of grasping spines but also of much smaller spicules corresponding in size and shape to the chaetognath teeth. Grasping spines of protoconodonts were originally built mainly of an organic substance. Their original composition was changed by secondary phosphatisation. The thickest layer of the protoconodont spines was originally constructed of organic fibrils, similar to those in the corresponding layer of chaetognaths. Recent molecu− lar investigations show that the chaetognath lineage separated in the early stage of metazoan radiation, which fits the pre− sented hypothesis. Described are some previously unknown structural details of chaetognath grasping spines, including composition of the outer layer and the origin of their distinctive tips." @default.
- W1007809339 created "2016-06-24" @default.
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- W1007809339 date "2002-01-01" @default.
- W1007809339 modified "2023-09-23" @default.
- W1007809339 title "New evidence for the protoconodont origin of chaetognaths" @default.
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