‖ orthoneura, n. pl.
(ɔːθəʊˈnjʊərə)
[mod.L., f. Gr. ὀρθό-ς ortho- ‘straight’ + νεῦρον nerve.]
In Gegenbaur's system of classification, a series of prosobranchiate gastropods, in which the commissure to the abdominal or visceral ganglion takes a straight course backwards.
| 1878 Bell tr. Gegenbaur's Comp. Anat. 348. |
Hence orthoˈneural, orthoˈneurous adjs., of or pertaining to the Orthoneura.