A photo manipulation of the blastula of "Argyrotheca cordata", 150μm, reduced to (3) colors, scharpened 3 times. Based on: Andreas Altenburger and Andreas Wanninger (2009). "Comparative larval myogenesis and adult myoanatomy of the rhynchonelliform (articulate) brachiopods Argyrotheca cordata, A. cistellula, and Terebratalia transversa". Frontiers in Zoology , 6:3 doi:10.1186/1742-9994-6-3, figure 1a.