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Figure 5 | Frontiers in Zoology

Figure 5

From: Developmental dynamics of myogenesis in the shipworm Lyrodus pedicellatus (Mollusca: Bivalvia)

Figure 5

Graphic representation based on 3D-reconstructions of larval myogenesis in Lyrodus pedicellatus . A, C, E, G are in lateral view, anterior is upwards, ventral to the left. B, D, F, H are in dorsal view, anterior is upwards. (A) Late veliger with round shells and a fully developed velum. The foot consists of two separated portions, the foot retractor and the anlage of the pedal plexus. (B) Late veliger with developing posterior adductor muscle which extends between the left and the right valve. (C) Mid-pediveliger with shrinking velum. The foot retractors and the pedal plexus have fused and together with a two-pronged accessory foot retractor form the foot musculature. The paired velum retractors are fully developed. An accessory adductor muscle appears. (D) Mid-pediveliger with a solid anterior and posterior adductor muscle. The accessory adductor muscle spans between the valves. Note the developing U-shaped mantle musculature. The accessory velum retractor has disappeared. (E) Late pediveliger with a largely atrophied velum. The velum ring musculature has disintegrated. For the most part, the velum retractors are resorbed distally. Paired finger-shaped mantle musculature develops. (F) Late pediveliger with remaining basal parts of the velum retractors which transform into the lateral and dorsal mantle musculature. This paired mantle musculature gains volume and has shifted more laterally compared to previous stages. (G) Early juvenile with shed velum. Ventrally, the U-shaped mantle musculature forms contact to the finger-shaped mantle musculature. (H) Early juvenile with lateral and dorsal mantle musculature at the periphery, parallel to the inner surface of the spherical shell.

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