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Figure 1 | EvoDevo

Figure 1

From: Development of the larval anterior neurogenic domains of Terebratalia transversa (Brachiopoda) provides insights into the diversification of larval apical organs and the spiralian nervous system

Figure 1

General aspects of gastrulation and larval development of Terebratalia transversa. Each panel consists of a blastoporal (left) and a corresponding lateral (right) view of a particular developmental stage. (A) Radial gastrula stage, the animal pole (AP) is at the top. (B) Asymmetric gastrula stage showing the shift of the animal pole toward the presumptive anterior of the embryo (ANT). (C) Bilateral gastrula stage, when the blastopore (BP) is a narrow slit. (D) Early trilobed larval stage that begins to demarcate the apical, mantle, and pedicle lobes (AL, ML, and PD, respectively) of the larva. The gut (G) is a blind-ended sac. (E) The late trilobed larval stage has a larger ventral mantle lobe relative to the dorsal side (D) that also bears chaetae (CH).

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ISSN: 2041-9139