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Fig. 19 | Frontiers in Zoology

Fig. 19

From: Insights into the structure and morphogenesis of the giant basal spicule of the glass sponge Monorhaphis chuni

Fig. 19

A model of structural organization and growth of the basal Monorhaphis spicule as revealed by this study. left Structural zones as seen in adult spicule: A PG (plain glassy) layers. B incipient TL (tuberculate) layer above PG. C advanced stage of TL. D Incipient AL (annular layer) above TL. E Fully developed AL above TL. middle Young sponge with spicule consisting only of PG layers (green); sponge body (grey) and sediment (dotted). Right: adult sponge showing various structural zones [green–PG (plain glassy silica) zone, yellow–TL (tuberculate layer) zone, orange–AL (annular layer) zone] and their relation to the sponge body (grey). A, B, C, D, E correspond to the boxes on the left figure. Sediment dotted

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Frontiers in Zoology

ISSN: 1742-9994