Alderina smitti Osburn, 1950,

Judith L Winston, 2016, Bryozoa of Floridan Oculina reefs, Zootaxa 4071 (1), pp. 1-81: 13-15

publication ID

http://doi.org/10.11646/zootaxa.4071.1.1

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lsid:zoobank.org:pub:D47C792F-E91D-40A6-ABB7-FA7810578562

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http://treatment.plazi.org/id/19362D2E-2019-FFBE-BBA5-FAFCFB9EFF75

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scientific name

Alderina smitti Osburn, 1950
status

 

Alderina smitti Osburn, 1950 

( Fig. 5View FIGURE 5; Table 4)

Membranipora irregularis: Smitt 1873: 8  , pl. 2, fig. 63; Osburn 1914: 194.

Alderina irregularis: Canu & Bassler 1928 a: 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.

Material examined. VMNH no. 70602; USNM no. 1283230.

Description. Colony encrusting, unilamellar ( Fig. 5View FIGURE 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. 5View FIGURE 5 B, C). Orifice indicated on distal wall skeleton by indentations. Large pore chambers can be seen on lateral walls of skeletal colonies ( Fig. 5View FIGURE 5 E, F). No avicularia. Ooecium transversely broad and narrow, with thickened crescents of calcification ( Fig. 5View FIGURE 5 D).

Remarks. Although descriptions of Alderina smitti  by various authors do not mention lateral spines, Fig. 5View FIGURE 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. 5View FIGURE 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.

TABLE 4. Measurements in mm of Alderina smitti Osburn, 1950.

Mean     0.070     0.151  
      0.009   0.041 0.031 0.022  
      0.054     0.126  
      0.081     0.180