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- Plesiocleidochasma cleidostomum Judith L Winston, 2016, Zootaxa 4071: 63-63.
Lepralia porcellana: Osburn 1914: 209. Hippoporina cleidostoma: Canu & Bassler 1928 a: 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.
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.
- Judith L Winston; 2016: Bryozoa of Floridan Oculina reefs, Zootaxa 4071: 63-63. doi