Lacinia

In the genus Neidium, a lacinia is a flap of silica with a triangular shape, which covers an external, distal raphe end. From Latin for flap of a garment. Plural is laciniae.

Internally, the distal raphe end of Neidium is straight and terminates in a thickened, raised helictoglossa.

Citations

Harwood, D. and Gersonde, R. (1990) Lower Cretaceous diatoms from ODP Leg 113 Site 693 (Weddell Sea) Part 2: Resting spores, chrysophycean cysts, an endoskeletal dinoflagellate, and notes on the origin of diatoms. Proceedings of the Ocean Drilling Program, Scientific Results 113: 403-425.
Siver, P.A., Hamilton, P.B., Stachura-Suchoples, K. and Kociolek, J.P. (2003) Morphological observations of Neidium species with sagittate apices, including the description of N. cape-codii sp. nov. Diatom Research 18: 131-148.