Plesiocleidochasma cleidostomum (Smitt, 1873) comb. nov. (Fig. 35; Table 34) Lepralia cleidostoma Smitt, 1873: 62, pl. 11, figs 217–219. Lepralia porcellana: Osburn 1914: 209. Hippoporina cleidostoma: Canu & Bassler 1928a: 104, pl. 9, fig. 7, pl. 32, fig. 6, text-fig. 18. Hippoporina porcellana: Osburn 1940: 428; Shier 1964: 633. Cleidochasma porcellanum: Cheetham & Sandberg 1964: 1032, text-fig. 35; Long & Rucker 1970: 19, fig. 4.2; Winston 1982: 147, fig. 80. Schedocleidochasma porcellanum: Winston 2005: 87, figs 244–246. Material examined. MCZ # 90, syntype of Lepralia cleidostoma, May 1, 1868, Cast No. 7, 26 fms [off Sombrero Key], L. Pourtales; VMNH no. 70652, 70653, 70654; USNM no. 1283259. Description. Colonies encrusting, in unilaminar patches to multilaminar mounds. Primary layer of zooids regularly hexagonal; frontally budded zooids irregularly polygonal. Frontal shield smooth to sparsely granular, flat over most of frontal surface (Fig. 35 B), raised around orifice, imperforate except for a few marginal pores. Orifice cleithridiate, rounded distally with proximally directed condyles, and narrow U-shaped sinus. Single or paired adventitious avicularia may occur on umbo proximolateral to orifice; rostra and mandibles acutely triangular (Fig. 35 C). Ovicell hyperstomial, prominent and delicately striated when newly formed, becoming granular and embedded in secondary calcification with age; imperforate, with frontal area in form of a thin curved-edged plate (labellum) between two lateral slits, leaving narrowly transverse opening (Fig. 35 A, B). Embryos reddish-pink. Discussion. Floridan Plesiocleidochasma cleidostomum is part of the ‘ Cleidochasma porcellanum ’ species complex, widely distributed in tropical and subtropical habitats, including the Western Atlantic (see Winston 2005). Soule, Soule & Chaney (1991) and Cook & Bock (1996) revised the genera and species included in the Cleidochasmatidae. Winston (2005) placed Smitt’s species in Schedocleidochasma, but Berning (2012) recently synonymized Schedocleidochasma under Plesiocleidochasma, a decision followed here. Distribution. Cape Hatteras to Florida, Caribbean, and Gulf of Mexico.

Published as part of Judith L Winston, 2016, Bryozoa of Floridan Oculina reefs, pp. 1-81 in Zootaxa 4071 (1) on page 63, DOI: 10.11646/zootaxa.4071.1.1, http://zenodo.org/record/260490