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

Figure 19. Exoskeletal structure of Orthopyxis sargassicola (Nutting, 1915).

Figure 19

(A) General morphology of the polyp; (B) exoskeleton of the hydrotheca and subhydrothecal spherule, stained with AB + PAS + H; (C)–(D) stained with TB; (C) hydrocaulus; (D) exoskeleton with diatoms at the base of the hydrocaulus; (E) gonotheca, stained with AB + PAS + H; (F) diatoms on the exoskeleton of the hydrocaulus, stained with AB. Red line indicates the exoskeleton (=perisarc). Abbreviations: a, annulation; cs, cusps; dm, diatoms; ep, epidermis; es, exoskeleton; g, gonophore; gct, gastrovascular cavity; gn, gonadal cell cluster; gt, gastrodermis; gth, gonotheca; ht, hydrotheca; ms, mesoglea; s, spherule; oc, outermost cover; t, tentacle.