Toxonidisigma Lobban & G. Reid, 2018

Lobban, Christopher S. & Reid, Geraldine, 2018, New Arcuatasigma species (Bacillariophyta, Pleurosigmataceae) from Guam and Belize, and the taxonomic identities of Toxonidea challengeriensis and its variety, Phytotaxa 346 (2), pp. 169-179 : 178

Toxonidisigma Lobban & G. Reid , gen. nov.

Diagnosis. Sigmoid frustules with one apex twisted such that both apices curve in the same direction, striae decussate.

Type species: Toxonisigma challengeriense (Castracane) Lobban & G. Reid

Etymology: Gr., n., combining the name of Toxonidea (“τόξο and ιδεα, bow-shaped”— Donkin 1858, but properly τόξο + ιδιον, dimunitive bow) with σιγμα (the letter Σ).