Retispora lepidophyta

Retispora lepidophyta is a spore type and an important biostratigraphic marker of the latest Devonian period.^[3][4][5] The last appearance of Retispora lepidophyta defines the Devonian-Mississippian boundary in Belgium and other places.

Retispora lepidophyta
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Lycophytes
Class:	Lycopodiopsida
Order:	Selaginellales
Family:	incertae sedis
Genus:	†Retispora
Species:	†R. lepidophyta
Binomial name
†Retispora lepidophyta (Kedo) Playford
Synonyms
Hymenozonotriletes lepidophytus[1] Spelaeotriletes lepidophytus.[2]

Description

Retispora is trilete, reticulate, and has a distinctly "fried egg" appearance, as the spore is zonate, and the inner area is much darker than the outer area.^[2]