Cupuladria biporosa Canu & Bassler, 1923,

Judith L Winston, 2016, Bryozoa of Floridan Oculina reefs, Zootaxa 4071 (1), pp. 1-81: 21-24

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Cupuladria biporosa Canu & Bassler, 1923


Cupuladria biporosa Canu & Bassler, 1923 

( Fig. 11View FIGURE 11, Table 10)

Membranipora canariensis: Smitt 1873: 10  , pl. 2, figs 69–71.

Cupuladria biporosa Canu & Bassler, 1923: 29  , pl. 47, figs 1–2; Cook 1965: 203, pl. 1, figs 2 A, B, 3 A, B, 4 A, B, 5, 6 A, B, text-fig. 1, g-j; Winston 2005: 13, figs 30, 37.

Cupuladria canariensis: Canu & Bassler 1928 a: 16  (part), text-fig. 2; Marcus & Marcus 1962: 285, pl. 1, figs 1–2; Lagaaij 1963 b: 225 (part), pl. 26, figs 4, 5.

Cupuladria  sp. Cheetham & Sandberg 1964: 1021.

Material examined. VMNH no. 70611, 70612; USNM no. 1283236.

Description. Saucer-shaped colonies, free-living on surface of sandy substrata, up to 16 mm diameter; many colonies broken through predation or physical disturbance; irregular fragments regenerating to repair missing areas and continuing to grow. Convex upper surface of the colony consisting of rows of radially arranged zooids ( Fig. 11View FIGURE 11 A –D). Autozooids rhomboidal, with frontal membrane underlain laterally and proximally by granular cryptocyst. At distal end of each zooid an interzooecial vibraculum with an ear-shaped chamber ( Fig. 11View FIGURE 11 C, D) and a mandible in the form of a long curved seta. Large vicarious vibracula, with scimitar-shaped setae occur in ancestrular region at apex of colony or in areas of regeneration. Lower surface of the colony consisting of extrazooidal calcification, which forms concentric rings, divided into small square sectors, each with 1-6, mostly 2- 4, round pores ( Fig. 11View FIGURE 11 E, F). No ooecia. Embryos brooded in zooids.

Remarks. Three cupuladriid species are common along the continental shelf from Cape Hatteras to Florida according to the study of Maturo (1968). The two smaller species, Cupuladria doma  and Discoporella depressa  , occur across the entire shelf, but Cupuladria biporosa  was found only on the outer part of the shelf. Their occurrence in Oculina  rubble may represent a death assemblage as no colonies found had been alive when collected, but sediment samples from the Florida shelf generally contain a large number of dead, relative to living, colonies of cupuladriids, so the species may well be part of the Oculina  reef community.

Distribution. Cape Hatteras to Brazil, Caribbean, Gulf of Mexico.

TABLE 10. Measurements in mm of Cupuladria biporosa Canu & Bassler, 1923.

Mean     0.315   0.220  
      0.032   0.012  
      0.252   0.198  
      0.396   0.234