Crepidacantha setigera (Smitt, 1873),

Judith L Winston, 2016, Bryozoa of Floridan Oculina reefs, Zootaxa 4071 (1), pp. 1-81: 61-63

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Crepidacantha setigera (Smitt, 1873)


Crepidacantha setigera (Smitt, 1873) 

( Fig. 34View FIGURE 34; Table 33)

Escharella setigera Smitt, 1873: 58  , fig. 206.

Crepidacantha setigera: Canu & Bassler 1928 a: 135  , pl. 21, fig. 10; Cook 1968: 186; Winston, 1982: 140, fig. 68.

Material examined. VMNH no. 70650, 70651; USNM no. 1283258.

Description. Colonies ( Fig. 34View FIGURE 34 A) encrusting calcareous substrata such as shell fragments and dead Oculina  branches. Zooids more or less oval, distinguished by delicate radiating spines, not erect but extending along substratum from distal ends of zooids ( Fig. 34View FIGURE 34 B –D; in skeletal colonies only remaining evenly spaced marginal pores may show their position. Zooid frontal shield slightly convex, flatter proximally, gradually raised into a low peristome around cleithridiate orifice. Adventitious avicularia paired, one either side of orificial sinus, with small cystid, slightly raised; avicularian lumen somewhat cleithridiate, with extremely long thin mandibles whose tips may reach beyond proximal edge of zooid bearing them ( Fig. 34View FIGURE 34 D). Ooecia develop as small imperforate hoods ( Fig. 34View FIGURE 34 E, F), helmet-shaped when completely developed, with imperforate peripheral ectooecium and relatively large central area of exposed entooecium with scattered small pores.

Remarks. The species is difficult to prepare for SEM without colonies separating along zooid margins into single zooids. For that reason, and to show the delicate spines and the long avicularium mandibles, colonies are illustrated without cleaning or bleaching.

Distribution. Florida, Caribbean, tropical East Pacific, West Africa.

TABLE 33. Measurements in mm of Crepidacantha setigera (Smitt, 1873).

Mean 0.561 0.466 0.130 0.084 0.230 0.266    
  0.072 0.062 0.015 0.012 0.025 0.016    
  0.450 0.360 0.108 0.072 0.198 0.234    
  0.702 0.594 0.162 0.108 0.270 0.288