FIGURE 8 in Revision of the Recent species of Exechonella Canu & Bassler in Duvergier, 1924 and Actisecos Canu & Bassler, 1927 (Bryozoa, Cheilostomata): systematics, biogeography and evolutionary trends in skeletal morphology

FIGURE 8. Exechonella antillea (Osburn, 1927). Caribbean Sea, Curaçao (A‒H: NNHML Coll. N° 2997, total mounts). A, autozooid with forming polypide and ovary (ov). B, autozooid containing polypide and 2-blastomers embryo (e) inside the internal brood sac (its wall shown by arrows). C‒D, autozooids with their frontal shield showing radiating sutures connecting foramina. Large lateralmost foramina bearing avicularia (not-recognizable in this magnification) are associated with kenozoidal (k) chamber. E, autozooid with polypide and lateral avicularium (arrowhead). F, avicularium showing semi-circular mandible (outline shown by arrowheads), rounded sclerite (s) and nipple-like structure with central opening (arrow). Granular tissue is visible. G, part of the frontal shield showing avicularium with semi-circular mandible (outline shown by arrowheads), rounded sclerite (s) and tendons of two muscles (arrow). Several foramina occluded by diatomeans are seen too. H, avicularian internal chamber with granular tissue and central body—presumed rudimentary polypide with retractor muscles below (arrows). Scale bars: A‒E = 100 µm; F = 50 µm; G, H = 20 µm.