Hippoporina caribaea Winston, 2005

Judith L Winston, 2016, Bryozoa of Floridan Oculina reefs, Zootaxa 4071 (1), pp. 1-81 : 54-56

Hippoporina caribaea Winston, 2005

( Fig. 30 ; Table 29 )

Escharella pertusa: Smitt 1873: 55 .

Hippodiplosia pertusa: Canu & Bassler 1928a: 106 , pl. 9, fig. 6; pl. 32, fig. 10; Osburn 1940: 430; Cheetham & Sandberg 1964: 1041, text-fig. 54; Shier 1964: 632.

Hippoporina americana: Long & Rucker 1970: 2 , fig. 4:1.

Hippoporina caribaea Winston, 2005: 65 , figs 174–178.

Material examined. MCZ #87, Smitt’s non-ovicellate holotype of Escharella pertusa [with Porina plagiopora ], 18 January 1869, cast no. 3, W. of Tortugas, 60 fms, coll. L. Pourtales; USNM, Hippodiplosia pertusa , plesiotype 7521, Albatross Stn D 2362, east of Yucatan; VMNH no. 70643; USNM no. 1283254.

Description. Colony encrusting dead Oculina or mollusc shells ( Fig. 30 A). Zooids subrectangular to irregularly polygonal, with relatively flat, thickly calcified frontal shield with many (70+) round pores and some larger irregular marginal pores; these becoming covered by secondary calcification ( Fig. 30 B, C). Orifice broadly hoof-shaped, with semicircular anter and shallow poster with rounded, downward facing condyles ( Fig. 30 E). Peristome low, rough-textured, with smooth inner and irregular outer margins. Raised calcification at zooid rims marks junctions of lateral walls of adjacent zooids as raised threadlike suture lines which may also be visible on ooecia. Ooecia large relative to zooid size, convex with round pseudopores similar to those of frontal shields, sometimes with suture lines ( Fig. 30 C, D).

Remarks. Although Smitt (1873) described his unillustrated specimen as having avicularia, none have been found on Floridan specimens. Smitt believed his specimen to be the Hippoporina pertusa (Esper, 1796) , the eastern Atlantic type species of the genus. This name continued to be used by later authors for western Atlantic material, but H. caribaea differs from H. pertusa in having almost twice as many frontal pores, large irregular marginal pores and no cruciform suboral umbo.

Distribution. Florida, Gulf of Mexico, Caribbean.

Figures

FIGURE 30. Hippoporina caribaea Winston, 2005: A, edge of a colony encrusting a mollusc shell; B, autozooids, showing threadlike calcification of zooid margins; C, zooid with an ooecium; D, close-up of orifice, showing condyles; E, close up of ooecium and orifice of fertile zooid. Scale bars: A, 1 mm; B, C, 0.3 mm; D, 0.1 mm; E, 0.2 mm.

Tables

TABLE 29. Measurements in mm of Hippoporina caribaea Winston, 2005.

	Lz	Wz	Lo	Wo	Lov	Wov
N	18	18	18	18	7	7
Mean	0.571	0.394	0.126	0.125	0.213	0.293
SD	0.061	0.052	0.010	0.008	0.019	0.059
Min	0.450	0.324	0.108	0.108	0.180	0.234
Max	0.684	0.486	0.144	0.144	0.234	0.378