Paratomy
Encyclopedia
Paratomy is a form of agammetic asexual reproduction
in animals where the organism splits in a plane perpendicular to the antero-posterior axis and the split is preceded by the "pregeneration" of the anterior structures in the posterior portion.The developing organisms have their body axis aligned i.e. they develop in a head to tail fashion.
Budding
can be considered to be similar to paratomy except that the body axes need not be aligned: the new head may grow toward the side or even point backward (eg. Convolutriloba retrogemma an acoel
flat worm). In animals that undergo fast paratomy a chain of zooid
s packed in a head to tail formation may develop. Many oligochete annelids, acoelous turbellarian
s, echinoderm larvae and ceolentrates reproduce by this method.
Asexual reproduction
Asexual reproduction is a mode of reproduction by which offspring arise from a single parent, and inherit the genes of that parent only, it is reproduction which does not involve meiosis, ploidy reduction, or fertilization. A more stringent definition is agamogenesis which is reproduction without...
in animals where the organism splits in a plane perpendicular to the antero-posterior axis and the split is preceded by the "pregeneration" of the anterior structures in the posterior portion.The developing organisms have their body axis aligned i.e. they develop in a head to tail fashion.
Budding
Budding
Budding is a form of asexual reproduction in which a new organism grows on another one. The new organism remains attached as it grows, separating from the parent organism only when it is mature. Since the reproduction is asexual, the newly created organism is a clone and is genetically identical...
can be considered to be similar to paratomy except that the body axes need not be aligned: the new head may grow toward the side or even point backward (eg. Convolutriloba retrogemma an acoel
Acoela
Acoela is an order of animals treated either as a group of flatworms or as one of the two classes of the phylum Acoelomorpha, containing the majority of that phylum's species. It contains about 20 families....
flat worm). In animals that undergo fast paratomy a chain of zooid
Zooid
A zooid or zoöid is a single animal that is part of a colonial animal. The zooids can either be directly connected by tissue or share a common exoskeleton...
s packed in a head to tail formation may develop. Many oligochete annelids, acoelous turbellarian
Acoela
Acoela is an order of animals treated either as a group of flatworms or as one of the two classes of the phylum Acoelomorpha, containing the majority of that phylum's species. It contains about 20 families....
s, echinoderm larvae and ceolentrates reproduce by this method.