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Fig. 2 | EvoDevo

Fig. 2

From: Shared regulatory function of non-genomic thyroid hormone signaling in echinoderm skeletogenesis

Fig. 2

Larval and juvenile skeletogenesis in sea star, sea urchin, and brittle star larvae. Larval skeleton is depicted in red, while juvenile skeleton is depicted in green. A Sea star gastrula (Pisaster ochraceus). No skeleton is present. B Sea star brachiolaria (P. o.). Adult skeleton develops in the somatocoel/rudiment. C Close-up of sea star rudiment (P. o.) skeletogenesis begins with small spicules, developing into the plates of the juvenile test. D Sea urchin gastrula (Strongylocentrotus purpuratus). Skeletogenesis begins with spicules at the ventrolateral clusters. These spicules will elongate and form the post-oral and anterolateral larval arms. E Sea urchin pluteus larva (S. p.). Juvenile skeletogenesis typically begins with the genital plate adjacent to the gut and tube feet/juvenile spines in the rudiment. F Close-up of sea urchin rudiment (S. p.) Tube feet and spines in the rudiment are among the first skeletal structures formed. G Brittle star gastrula (Ophiopholis aculeata) Skeletogenesis begins with spicules at the ventrolateral clusters. These spicules will elongate and form the post-oral and anterolateral larval arms. H Brittle star ophiopluteus (O. a.) Adult skeletogenesis begins adjacent to the gut with the formation of terminal and radial plates. I Close-up of ophiopluteus (O. a.) gut and hydrocoel. ar: archenteron, hc: hydrocoel, sc: somatocoel, rud: rudiment, mg: midgut, op: oral plate, mp: madreporitic plate, la: larval arm, js: juvenile spine, gp: genital plate, tf: tube foot, tp: terminal plate, rp: radial plate

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