Guazia, the earliest ovule without cupule but with unique integumentary lobes

Abstract

Abstract The earliest ovules in the Late Devonian (Famennian) are surrounded by a cupule functioning as protection and for pollination, and generally have free integumentary lobes. Here we report a new taxon from the Famennian of China, Guazia dongzhiensis gen. et sp. nov. The terminally borne ovule is apparently acupulate (without cupule) and has four radially arranged wing-like integumentary lobes that are extensively fused, and folded lengthwise and inwards. Guazia provides evidence that not all Devonian seeds possess a cupule and it increases their diversity in integumentary lobes. This genus also suggests that the integuments develop new functions probably including wind dispersal at the expense of the cupules.