Hippopodina feegeensis (Busk, 1884)

Hippopodina feegeensis (Busk, 1884) View in CoL

Figure 39 View FIGURE 39

v. 1884 Lepralia feegeensis Busk , p. 144, pl. 22, figs. 9, 9a, 9b.

v. 1957 Hippopodina feegeensis (Busk) ; Harmer, p. 974, pl. 67, figs. 8–9.

v. 1992 Hippopodina feegeensis (Busk) ; Ryland and Hayward, p. 256, pl. 67, fig. 17a.

v. 1999 Hippopodina feegeensis (Busk) ; Tilbrook, p. 451, fig. 1a–h.

v. 2015 Hippopodina feegeensis (Busk) ; Di Martino and Taylor, p. 11, pl. 27.

Figured material. PMC EDM-Collection J.H.B.138a, sample 19185 ( Figure 39A–B View FIGURE 39 ) and sample 19160 ( Figure 39C View FIGURE 39 ); Core 19, Daidokutsu cave, Okinawa, Japan, Holocene.

Description. Colony encrusting, multiserial, unilaminar. Autozooids distinct, separated by thin furrows, rectangular, slightly longer than wide (mean ZL/ZW 1.39). Frontal shield slightly convex, tuberculate (tubercle diameter 25–52 μm), evenly punctuated by numerous circular pseudopores, 5–10 μm in diameter, arranged between tubercles. Orifice hoof-shaped, slightly longer than wide, with a pair of small, rounded, lateral condyles directed medially, separating a rounded anter from a smaller, bowl-shaped poster. Adventitious avicularia paired, located distolaterally of orifice facing medially; rostrum acutely triangular, raised, directed distolaterally and inwardly; crossbar complete. Ovicells not observed.

Measurements (µm). ZL 895±32, 873–918 (2, 2); ZW 643±124, 555–731 (2, 2); OL 286±11, 279–294 (2, 2); OW 265±33, 242–288 (2, 2); AvL 219±20, 202–252 (2, 5); AvW 133±14, 113–148 (2, 5).

Remarks. This species is identified as the Pacific H. feegeensis essentially based on the shape and positioning of avicularia and the shape of the orifice, where the distal portion is wider than the proximal portion (see Tilbrook, 1999).