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Figure 1 | EvoDevo

Figure 1

From: Mesodermal gene expression during the embryonic and larval development of the articulate brachiopod Terebratalia transversa

Figure 1

Diagrams of T. transversa development and distribution of musculature in the competent larva. All images are oriented with anterior to the left. Panels (A-D) and (I) are lateral views. Panels (E, F) and (J) are blastoporal/ventral views. Panels (G, H) are ventral views. (A-H) Diagrammatic views of T. transversa gastrula and larval stages. The mesoderm is shaded red, the endoderm is shaded yellow, and the ectoderm is shaded gray. (A, E) The location of the blastopore in the radial gastrula stage is denoted by an asterisk. (D) Lateral view of the late larval stage. One set of dorsal chaetae (black arrowhead) is shown emerging from the mesodermal chaetal sac in the mantle lobe. (H) Ventral view of the late larval stage. Lateral chaetae (black arrows) are shown emerging from the mesodermal chaetal sacs in the mantle lobe. Dorsal chaetae are behind the plane of the cross section (black arrowheads). (I-K) Expression of Tt.tropomyosin during T. transversa development. (I, J) Tt.tropomyosin is expressed in the anterior and lateral portions of the archenteron wall during late gastrula and early larval stages. (K) Tt.tropomyosin is expressed in the mesoderm of the mantle lobe, including the chaetal sacs (black arrowheads) and the lateral regions of the pedicle lobe (black arrows) during the late larval stage. Scale bars are 50 μm in length. (L, M) Phalloidin staining of filamentous actin in the musculature of the competent larval stage. Images are projections of confocal z-series through half of the larva. (L) Lateral view showing complex musculature in the apical, mantle, and pedicle lobes. The prominent pedicle muscles can be observed the ventral region of the larva (white arrowhead). (M) Ventral view of larval musculature. Bundles of muscles are present in the lateral chaetal sacs of the mantle lobe (open arrowheads). Relatively little staining is detected medially in the pedicle lobe (white arrow) between the paired pedicle muscles (white arrowheads).

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