Parasmittina spathulata (Smitt, 1873),

Judith L Winston, 2016, Bryozoa of Floridan Oculina reefs, Zootaxa 4071 (1), pp. 1-81: 52

publication ID

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

publication LSID

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

persistent identifier

http://treatment.plazi.org/id/19362D2E-2026-FF83-BBA5-FF0EFBE7FAEA

treatment provided by

Plazi

scientific name

Parasmittina spathulata (Smitt, 1873)
status

 

Parasmittina spathulata (Smitt, 1873) 

( Fig. 28View FIGURE 28; Table 27)

Escharella jacotini  var. spathulata Smitt, 1873: 60  , pl. 10, figs 199, 200 (not fig. 11).

Parasmittina trispinosa  var. spathulata: Osburn 1914: 208  .

Smittina trispinosa spathulata: Canu & Bassler 1928 a: 114  , pl. 15, figs 9–13, text-fig. 21; 1928 b: 86, pl. 6, fig. 3; Osburn 1940: 435.

Parasmittina spathulata: Cheetham & Sandberg 1964: 1037  , figs 44–47; Rucker 1967: 830, fig. 16 a; Long & Rucker 1970: 20, fig. 4: 5; Winston 1982: 142, fig. 70; 2005: 60, figs 161–163.

Material examined. VMNH no. 70641; USNM no. 1283253.

Description. Colony encrusting on hard substrata ( Fig. 28View FIGURE 28 A). Zooids more or less rectangular to irregularly polygonal. Frontal shield flat, imperforate, with surface made up of large hemispherical mounds of calcification ( Fig. 28View FIGURE 28 B, C), edged by row of large marginal pores. Primary orifice rounded distally, with denticulate condyles and narrow rounded lyrula ( Fig. 28View FIGURE 28 E, F). Secondary orifice teardrop-shaped at edge of low laterally, and sometimes distally, raised peristome that partly conceals primary orifice ( Fig. 28View FIGURE 28 C –D). Usually 2, sometimes 3, orificial spines, soon covered by secondary calcification. Avicularia variable in size, usually 1 long and narrow, proximally or slightly proximolaterally directed, positioned toward lateral edge of frontal wall proximal to orifice on one side and often another shorter one on the opposite side ( Fig. 28View FIGURE 28 E), each with roundly pointed rostral tip and palatal shelf occupying almost half rostral length. Larger, more-spatulate avicularia may also occur. Ovicell prominent, hyperstomial, with tops and sides covered with granular calcification, and frontal surface with many small irregularly spaced pseudopores.

Remarks. This is probably the most abundant Parasmittina  occurring on subtidal to shelf-depth calcareous substrata on the southeastern U.S. coast.

Distribution. Western Atlantic: Cape Hatteras to Caribbean and Gulf of Mexico.

TABLE 27. Measurements in mm of Parasmittina spathulata (Smitt, 1873).

Mean       0.100    
        0.010    
    0.270   0.090    
    0.504   0.117