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Figure 1 | BMC Evolutionary Biology

Figure 1

From: Dicyema Pax6 and Zic: tool-kit genes in a highly simplified bilaterian

Figure 1

Dicyema acuticephalum. (A) Light micrograph of a rhombogen. Note that embryos develop in the axial cell. Scale bar, 10 μm. (B) Life cycle of the dicyemid (after Furuya and Tsuneki [1]). The dotted line indicates an unknown process. The vermiform stage includes the nematogen, rhombogen, and vermiform embryo. The development of infusorigens, gametogenesis around the infusorigen, and development of the 2 types of embryo all proceed within the axial cell.AG, agamete; AX, axial cell; CL, calotte; D, developing infusoriform embryo; DV, developing vermiform embryo;H, hermaphroditic gonad (infusorigen); IN, infusoriform embryo; P, peripheral cell.

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