Apiophragma hyalina Waters 1904

• Main Authors: Gordon, Dennis P., Taylor, Paul D.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2017
• Subjects: Biodiversity; Taxonomy; Animalia; Bryozoa; Gymnolaemata; Cheilostomatida; Microporidae; Apiophragma; Apiophragma hyalina; Ross Sea; Hayward; Adare; Cape Adare; Antarc*; Antarctica
• Online Access: https://zenodo.org/record/6043898; https://doi.org/10.5281/zenodo.6043898

Apiophragma hyalina (Waters, 1904) (Fig. 14) Megapora hyalina Waters, 1904: 39, text-fig. 1, pl. 2, figs 13a, b. Apiophragma hyalina: Hayward & Ryland 1993: 120, fig. 1; Hayward 1995: 154, fig. 120E, F. Material examined. NIWA 23005, NIC Wellington, Stn TAN 0402 /73, 72.0613° S, 173.2455° E – 72.0647° S, 173.2632° E, 620–622 m, NW Ross Sea off Cape Adare, Antarctica, 13 February 2004. Redescription. Colony encrusting, small, spot-like, maximum spread up to 4.5 mm. Autozooids arranged contiguously in quincunx, communicating via basal pore-chambers, of which two lateral pairs and one mid-distal are visible in zooids at colony margin [ZL400–661 (561); ZW 343–544 (468)]. Gymnocyst continuous around zooid, narrow to moderately well developed. Cryptocyst and opesia surrounded by a distinct pyriform rim constricted at level of proximalmost oral spines [CrL 298–412 (360); CrW 239–350 (317)]. Cryptocystal shelf extensive, flat, with a pair of suboval opesiules. Opesia generally a little wider than long, distal margin rounded and tubercular, straight proximally, constricted in proximal third; articular surface smooth, rounded, operculum occupying c. three-quarters of opesial length [OpL 110–145 (122)]. Six articulated spines, perioral only, all of which are retained in ovicellate zooids, arranged in arc around operculum; 0–2 additional tiny spines on each lateral gymnocyst. No avicularia. Ooecium hyperstomial, acleithral, smooth with longitudinal carina in proximal half, carina occupied by elongate slit or smaller excavation [OoL 217–232 (226); OoW 233–245 (239)]. Ooecial kenozooid protruding a little distally, with small opesial foramen surrounded by semicircular cryptocyst, subgranular to smooth, flanked by pair of smaller pore-chambers. Ancestrula resembling later zooids but with slightly longer opesia and nine pericryptocystal spines [AnL 335–431 (383); AnW 223–305 (264)]. Remarks. Waters (1904) did not describe the ooecium, which meant that his illustration of it was ambiguousis the longitudinal feature on the ...