acron

(redirected from Acro Helenius)

acron

[′ak‚rän]
(evolution)
Unsegmented head of the ancestral arthropod.
(invertebrate zoology)
The preoral, nonsegmented portion of an arthropod embryo.
The prostomial region of the trochophore larva of some mollusks.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.