Diphyllidia (difilidia)

[NL.; cf. Diphyl lidea.] A genus of nudibranchiate gastropods: a synonym of Pleurophyllidia (which see). diphyllidiid (dif-i-lid'i-id), n. A gastropod of the family Diphyllidiida. Diphyllidiide (di-fil-i-di'i-dē), n. pl. diplanetism genus of phytophagous tetramerous beetles, of the family Chrysomelid a.-2. A genus of lamellicorn beetles, of the family Scarabæida. Diphyllodes (di-fi-lō'dēz), n. [NL. (Le on, 1835), In the Marsupial i a the diphyodont condition is in a rudimentary stage, for it is confined to one tooth only on either side of the jaw. Gegenbaur, Comp. Anat. (trans.), p. 552. II. n. A mammal which has two sets of teeth. Most mammals have a definite set of milk-teeth which are deciduous, and are displaced and replaced by a permanent set. The latter, as a rule, differ both numerically and otherwise from the former, particularly in the appearance of true molars, which are lacking in the milk dentition. Thus, in a child there are 20 teeth, none of them molars proper; in the adult there are 32, an increase of three molars above and below on each side.