protonephridialadj.
/ˌprəʊtə(ʊ)nᵻˈfrɪdɪəl/, U.S. /ˈˌproʊdoʊnəˈfrɪdiəl/ Zoology.
Of or relating to a protonephridium; that is a protonephridium.
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protonephridial1895
1895 E. S. Goodrich in Q. Jrnl. Microsc. Sci. 37 479 The nephridia of the Planarians..are formed of a main duct, which branches out into fine tubules ending blindly internally in flame-cells; they do not develop beyond this ‘protonephridial’ condition.
1908 Philos. Trans. (Royal Soc.) B. 199 201 The larval and permanent nephridia follow one another in a series, the nephridium of the first segment never getting beyond the larval or protonephridial stage.
1963 R. P. Dales Annelids v. 98 The metanephridial funnels or protonephridial solenocytes lie in the coelomic fluid.
1977 T. I. Stoner et al. Elem. Zool. (ed. 4) vii. 97/2 Flatworms, ribbon worms and rotifers have a protonephridial system consisting of from few to many terminal flame cells.
2002 Evolution 56 2446/1 Based mainly on the protonephridial system, the genus [sc. the monogenean Gyrodactylus] was divided into six subgenera by Malmberg.
This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).
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adj.1895