Ammatophora typica Canu & Bassler, 1928,

Judith L Winston, 2016, Bryozoa of Floridan Oculina reefs, Zootaxa 4071 (1), pp. 1-81: 16-17

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

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scientific name

Ammatophora typica Canu & Bassler, 1928
status

 

Ammatophora typica Canu & Bassler, 1928  a comb. nov.

( Fig. 7View FIGURE 7; Table 6)

Floridinella typica Canu & Bassler, 1928 a: 59  , pl. 6, figs 6–7, text-fig. 8 b; Winston 1982: 125, fig. 40.

Material examined. AMNH 594, Floridinella typica  ; VMNH no. 70604, 70605; USNM no. 1283232.

Description. Colonies encrusting calcareous substrata such as dead mollusc shell or Oculina  branches ( Fig. 7View FIGURE 7 A). Zooids roughly oval to diamond shaped, about 0.57 mm long, 0.415 mm wide) with large rounded-triangular to bell-shaped opesia occupying half or more of zooid length, bordered by coarsely granular cryptocyst that is narrow laterally, broad proximally ( Fig. 7View FIGURE 7 B, C). Cryptocystal rim minutely granular. Gymnocyst very narrow, more developed proximally where it forms a broad solid tubercle, rounded to conical in shape. No avicularia. Ooecium imperforate with smoothly curved proximal rim, much broader than long, marked by a pair of large tubercles like those on gymnocyst. Internal communication pores recessed between thick pillars of calcification; internal distal walls of zooids with ooecia appear smooth and hollowed out, lacking the calcified pillars typical of autozooids ( Fig. 7View FIGURE 7 C, D).

Remarks. Canu & Bassler (1928 a) included this species in the fossil genus Floridinella Canu & Bassler, 1917  , now considered a junior synonym of Ammatophora Norman, 1903  . The Floridan species is very similar to the sand-fauna species Ammatophora arenacea  from Brazil (Winston & Vieira 2013) in overall appearance, but the former has larger zooids (0.396–0.702 by 0.324–0.582 mm vs 0.360–0.576 by 0.198–0.306 mm). Like the eastern Atlantic type species Ammatophora nodulosa (Hincks, 1877)  , the two western Atlantic species are found on subtidal to shelf-depth shell fragments. Ammatophora typica  is a different, and apparently much less widespread, species than the other ‘ typica  ’ described in the same publication, Dacryonella typica  , now Antropora typica  .

Distribution. Florida Atlantic shelf, including Oculina  reefs.

TABLE 6. Measurements in mm of Ammatophora typica (Canu & Bassler, 1928).

Mean 0.570 0.415 0.099 0.165 0.273 0.250 0.177 0.309
  0.068 0.041 0.010 0.014 0.026 0.031 0.026 0.030
  0.396 0.324 0.090 0.144 0.234 0.198 0.126 0.270
  0.702 0.486 0.108 0.180 0.324 0.306 0.198 0.360