Bryozoa of Floridan Oculina reefs Author Judith L Winston text Zootaxa 2016 4071 1 1 81 journal article 10.11646/zootaxa.4071.1.1 8ffe5a88-06f7-44af-95aa-5fd49e0302c4 1175-5326 260490 D47C792F-E91D-40A6-ABB7-FA7810578562 Alderina smitti Osburn, 1950 ( Fig. 5 ; Table 4 ) Membranipora irregularis : Smitt 1873: 8 , pl. 2, fig. 63; Osburn 1914: 194. Alderina irregularis : Canu & Bassler 1928a: 27 , pl. 3, fig. 3, pl. 32, fig. 4; Hastings 1930: 708, pl. 3, figs 11–12; Osburn 1940: 363; Marcus 1941: 15, pl. 1, fig. 2. Alderina smitti Osburn, 1950: 59 , pl. 6, fig. 2; Winston & Håkansson 1986: 11, figs 17–18; Winston & Vieira 2013: 106, fig. 4. TABLE 4. Measurements in mm of Alderina smitti Osburn, 1950 .

Lz	Wz	Lo	Wo	Lop Wop	Lov	Wov
N	18	18	12	12	18 18	11	11
Mean	0.379	0.265	0.070	0.093	0.254 0.181	0.151	0.242
S D	0.034	0.028	0.009	0.007	0.041 0.031	0.022	0.027
Min	0.306	0.216	0.054	0.081	0.198 0.126	0.126	0.216
Max	0.450	0.306	0.081	0.108	0.396 0.234	0.180	0.306

FIGURE 5. Alderina smitti Osburn, 1950 : A, entire small colony; B, zooids near colony origin; C, enlarged view of zooid, showing hollow spines; D, group of zooids, two with ooecia; E, distal interior of zooid; F, zooids at growing edge, showing pore chambers. Scale bars: A, 1 mm; B, E, 0.3 mm; C, F, 0.2 mm. Material examined. VMNH no. 70602; USNM no. 1283230. Description. Colony encrusting, unilamellar ( Fig. 5 A). Zooids oval to pyriform, the oval frontal membrane underlain by a depressed cryptocyst with one or more rows of aligned beads of calcification on its rim and a gymnocyst with small tubercles just outside the rim ( Fig. 5 B, C). Orifice indicated on distal wall skeleton by indentations. Large pore chambers can be seen on lateral walls of skeletal colonies ( Fig. 5 E, F). No avicularia. Ooecium transversely broad and narrow, with thickened crescents of calcification ( Fig. 5 D). Remarks. Although descriptions of Alderina smitti by various authors do not mention lateral spines, Fig. 5 shows small calcified projections on the lateral and proximal gymnocyst just outside the cryptocystal rim that appear to be the remains of ephemeral spines ( Fig. 5 B, C. These spine bases can also be seen in the illustrations of the species in Winston & Håkansson (1986) and Winston & Vieira (2013). Distribution. Tropical western Atlantic, Gulf of Mexico , and eastern Pacific.