Radula with elongated and pointed teeth, like those of the Agnatha; a jaw present.
There is much to be said in favour of the view entertained by some entomologists that the structural and developmental characteristics of may-flies are sufficiently peculiar to warrant the formation for them of a special order of insects, for which the names Agnatha, Plectoptera and Ephemeroptera have been proposed.
- Agnatha, Aprosthomera.
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