Akatopora leucocypha (Marcus, 1937),

Judith L Winston, 2016, Bryozoa of Floridan Oculina reefs, Zootaxa 4071 (1), pp. 1-81: 20

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

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scientific name

Akatopora leucocypha (Marcus, 1937)
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Akatopora leucocypha (Marcus, 1937) 

( Fig. 9View FIGURE 9; Table 8)

Crassimarginatella leucocypha Marcus, 1937: 46  , pl. 8, fig. 20 A, pl. 9, figs 20 B, C; 1938: 20, pl. 3, figs 8 A, B. Conopeum reticulum  (part): Osburn 1940: 351.

Antropora leucocypha: Shier 1964: 613  ; Winston 1982: 123, fig. 36; Winston & Håkansson 1986: 9, figs 14–16. Akatopora leucocypha: Winston & Vieira 2013: 110  , fig. 7.

Material examined. VMNH no. 70607, 70608; USNM no. 1283234.

Description. Colonies encrusting shells of living and dead gastropods, including very small gastropods found in Oculina  rubble ( Fig. 9View FIGURE 9 B). Zooids oval to irregular in shape. Lateral walls with scattered tubercles. Frontal membrane underlain by a distally narrowing cryptocystal rim, with granules arranged along radial rows ( Fig. 9View FIGURE 9 E, F). Well-calcified basal walls with thick internal vertical ridges. Triangular or rounded kenozooids with similarly patterned cryptocyst found between autozooids ( Fig. 9View FIGURE 9 A, C). Small avicularia with semicircular mandibles may also occur. Ooecia indicated by a narrow crescent of calcification ( Fig. 9View FIGURE 9 G).

Remarks. Gordon (1986) suggested that two species of Antropora  , A. leucocypha  and A. tincta  should be included in Akatopora  because, like the type species Akatopora clausentina Davis, 1934  , zooids have a reduced cryptocyst, enlarged opesia and small kenozooids in the interzooidal angles. This decision was followed by Winston & Vieira (2013). Akatopora leucocypha  is distinguished by its lack of avicularian condyles and in having a semicircular avicularian mandible (see Marcus 1937, pl. 8, fig. 20 A). In Florida Akatopora leucocypha  is common on gastropod shells from intertidal to continental shelf depths.

Distribution. Cape Hatteras to Brazil, Caribbean, and Gulf of Mexico.

TABLE 8. Measurements in mm of Akatopora leucocypha (Marcus, 1937).

Mean 0.391 0.271 0.243  
  0.059 0.038 0.035  
  0.288 0.216 0.198  
  0.486 0.360 0.324