By Andreas Wanninger
This multi-author, six-volume paintings summarizes our present wisdom at the developmental biology of all significant invertebrate animal phyla. the most facets of cleavage, embryogenesis, organogenesis and gene expression are mentioned in an evolutionary framework. every one bankruptcy provides an in-depth but concise review of either classical and up to date literature, supplemented via various colour illustrations and micrographs of a given animal team. The principally taxon-based chapters are supplemented by way of essays on topical features correct to modern day EvoDevo learn akin to regeneration, embryos within the fossil list, homology within the age of genomics and the position of EvoDevo within the context of reconstructing evolutionary and phylogenetic eventualities. a listing of open questions on the finish of every bankruptcy might function a resource of concept for the subsequent new release of EvoDevo scientists. Evolutionary Developmental Biology of Invertebrates is a must have for any scientist, instructor or pupil attracted to developmental and evolutionary biology in addition to commonly invertebrate zoology.
This 3rd quantity on ecdysozoans is devoted to the Hexapoda. regardless of being the main species-rich animal clade through a ways, relatively little developmental facts is on the market for almost all of hexapods, in stark distinction to 1 of the best-investigated species on the earth, the fruit fly Drosophila melanogaster. hence, a complete bankruptcy is devoted to this famous and demanding version species, whereas the 2 final chapters summarize our present wisdom on early and past due improvement in different hexapods.
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Additional info for Evolutionary Developmental Biology of Invertebrates 5: Ecdysozoa III: Hexapoda
It is distinguished from the ventral somatic mesoderm (ventroanterior quadrant) by its continued strong expression of the transcription factor Tinman (Tin).
14E, F1). The one, 31 large daughter cell, remaining within the position of its mother neuroblast adjacent to the ectodermal layer, continues dividing in the same, asymmetric mode for another four to seven rounds. The small cell, located further interiorly in the embryo and called a “ganglion mother cell” (GMC), typically divides only one more time, giving rise to two daughter cells that become postmitotic and differentiate into neurons or glial cells. With each subsequent division of the neuroblast, the early born GMC/neurons are pushed further away from the ectoderm.
Sublineages are specified by TFs, expressed in a defined temporal sequence by the dividing neuroblast (Pearson and Doe 2004; Brody and Odenwald 2005). It is thought that the dynamic transcriptional code imbues a neuroblast with the genetic information that shapes the connectivity of the neurons it produces. Axonal Pathﬁnding and Connectivity Axons follow specific pathways to reach their target. Typically, a small subset of neurons at strategic positions within the nervous system differentiate early and lay down a network of connections, called “pioneer tracts” (the neurons, correspondingly, are often called “pioneer neurons”; Goodman and Doe 1993).
Evolutionary Developmental Biology of Invertebrates 5: Ecdysozoa III: Hexapoda by Andreas Wanninger