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protostoma. In DICTIOUS you will not only get to know all the dictionary meanings for the word
protostoma, but we will also tell you about its etymology, its characteristics and you will know how to say
protostoma in singular and plural. Everything you need to know about the word
protostoma you have here. The definition of the word
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English
Etymology
From proto- + Ancient Greek στόμα (stóma, “mouth”).
Noun
protostoma (plural protostomata)
- (embryology, obsolete) Synonym of blastopore
1919, Ernest William MacBride, Text-book of Embryology:It is frequently stated by critics of the protostoma hypothesis that it involves a reversal of dorsal and ventral sides during the evolution of Vertebrates from their invertebrate ancestors but it will be gathered from what has been said that this criticism rests on a misunderstanding.
1921, John Graham Kerr, Zoology for Medical Students, page 150:The opening of this, the protostoma, becomes elongated, taking on an elliptical shape, and then it narrows in the middle, its outline becoming that of a dumb-bell.
- (zoology) In nematodes, a particular division of the stoma (mouthlike opening).
1968, Konstantin Ivanovich Skirabin, Key to Parasitic Nematodes, volume 1:The protostoma with its wall—the protorhabdion—is the major part of the stoma.
1977, Ivan Antonovich Rubtsov, Aquatic Mermithidae of the Fauna of the USSR:Conventionally, the stoma is divided into three parts: the anterior chamber or cheilostoma, the middle or protostoma, and the posterior or telostoma.
Derived terms
Italian
Etymology
From proto- + stoma.
Noun
protostoma m (plural protostomi)
- (zoology) protostome