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. 2017 Feb 16;5:e2964. doi: 10.7717/peerj.2964

Figure 14. Internal and exoskeletal structure of Turritopsis sp.

Figure 14

(A) Exoskeleton of the lower part of the hydranth, stained with HE; (B) irregularly corrugated exoskeleton of polyps, stained with TB; (C) granular outermost cover of the hydrocaulus, stained with TB; (D) exoskeleton with diatoms, stained with AB + PAS + H. Red line indicates the exoskeleton. Abbreviations: dm, diatoms; em, external material; ep, epidermis; es, exoskeleton; gct, gastrovascular cavity; gt, gastrodermis; ms, mesoglea; oc, outermost cover; t, tentacle; zmg, zymogen glandular cell.