Pyriporoides uniserialis Waters 1904

• Main Authors: Gordon, Dennis P., Taylor, Paul D.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2017
• Subjects: Biodiversity; Taxonomy; Animalia; Bryozoa; Gymnolaemata; Cheilostomatida; Calloporidae; Pyriporoides; Pyriporoides uniserialis; Bellingshausen Sea; Graham Land; Palmer Archipelago
• Online Access: https://doi.org/10.5281/zenodo.6043858; http://treatment.plazi.org/id/03A78782FFA9E47080F44A9DFDEAFBA3

Pyriporoides uniserialis (Waters, 1904) (Fig. 2) Membranipora uniserialis Waters, 1904: 32, pl. 2, fig. 2. Pyriporoides uniserialis : Hayward & Thorpe 1989: 914, fig. 1A; Hayward 1995: 73, fig. 64. Material examined. Lectotype : RBINS BRY.392, RBINS, Brussels, SY Belgica Stn 570, 70.3833° S, 82.7833° W, 480 m, Bellingshausen Sea, 8 October 1898 (part of Waters’s figured material). Other material : NHMUK 1995.5.23.4–5, Discovery Stn 190, off Graham Land, Palmer Archipelago, 64.9333° S, 65.5833 W, 93–130 m, 24 March 1927. Redescription. Colony comprising encrusting uniserial runners, zooids having a cruciform budding pattern, with a lateral daughter zooid produced more or less at right angles (or shallower) from one or both of the distolateral pore-chambers, rarely from proximolateral pore-chambers (evident in some zooids), or budding is suppressed. Autozooids elongate-pyriform–claviform, with a proximally tapered portion of variable length [ZL 631–920 (805); DL 555–787 (653); CL 60–236 (152); DW 381–498 (439)], the gymnocyst proximally and laterally extensive, sloping to the substratum. Opesia and cryptocystal shelf surrounded by a raised elongate-oval cryptocystal rim that has linear granulations on the edge and inner face [CrL 307–504 (391); CrW 207–293 (257)]. Proximal cryptocystal shelf extensive, flat, evenly granular, the granules becoming a little more pustular at the edge of the opesia, the shelf attenuating distad to the opesiular constriction. Opesia about twice as long as wide, weakly dumbbell-shaped, being constricted by rounded projections that have a tubercular surface; distal (lower edge) and proximal opesial rims gently rounded, the proximal rim sometimes obliquely so [OpL 218–227 (223)]. Operculum flap-like, occupying area of opesia distal to constriction. Articulated spines perioral, six in total, more or less erect, not arching; no accessory gymnocystal spines. Ooecium hyperstomial, frontally a little longer than wide, smoothsurfaced with a short longitudinal peak that contains a small ...