Fig. 2From: A comparative view of early development in the corals Favia lizardensis, Ctenactis echinata, and Acropora millepora - morphology, transcriptome, and developmental gene expressionSchematic diagram showing the two major types of scleractinian development leading up to gastrulation. The complex corals typically have a minimal blastocoel before the start of gastrulation and only assume a spherical shape once gastrulation is complete. The robust corals, in contrast, develop a pseudo-blastopore (+) and pass through a hollow spheroidal stage before gastrulation begins. Endodermâ=âblue circles, mesogleaâ=âpurple lines, asteriskâ=âblastopore. Modified from [6, 7]Back to article page