Skip to main content
. 2017 Feb 16;5:e2964. doi: 10.7717/peerj.2964

Figure 20. Exoskeletal structure of Obelia dichotoma (Linnaeus, 1758).

Figure 20

(A)–(C) Stained with HE; (A) Exoskeleton of hydrocaulus and hydranth; (B) exoskeleton of the hydrocaulus; (C) exoskeletal layer in the hydrocaulus; (D) general exoskeletal structure with outermost cover and associated diatoms, stained with AB. Red line indicates the exoskeleton (=perisarc). Abbreviations: a, annulation; dh, diaphragm; dm, diatoms; ep, epidermis; es, exoskeleton; gc, glandular cell; gct, gastrovascular cavity; gt, gastrodermis; ht, hydrotheca; ms, mesoglea oc, outermost cover.