Antropora typica (Canu and Bassler, 1928)

Antropora typica (Canu and Bassler, 1928) View in CoL

Figure 6 View FIGURE 6

v. 1928 Dacryonella typica Canu and Bassler , p. 87, pl. 5, figs. 4–8; pl. 32, figs. 11, 12.

v. 1967 Antropora typica (Canu and Bassler) ; Rucker, p. 817, fig. 12b.

v. 1986 Antropora typica (Canu and Bassler) ; Winston, p. 5, figs. 1, 2.

v. 1998 Antropora typica (Canu and Bassler) ; Tilbrook, p. 37, figs. 1F, 3A.

Figured material. PMC EDM-Collection J.H.B.123a, sample 19072 ( Figure 6A–C View FIGURE 6 ) and sample 19230 ( Figure 6D–E View FIGURE 6 ); Core 19, Daidokutsu cave, Okinawa, Japan, Holocene.

Description. Colony encrusting, multiserial, unilaminar. Autozooids distinct, separated by fine furrows, oval, quincuncially arranged, longer than wide (mean ZL/ZW 1.21). Gymnocyst smooth, generally narrow, visible entirely around perimeter of zooid, more extensive proximally, tapering laterally and distally; cryptocyst outlined by a raised, beaded rim, slightly depressed, flat, and granular, broader proximally, narrowing laterally before disappearing distally. Opesia oval to pear-shaped, occupying two-thirds of total autozooid length (mean OpL/ZL 0.69). Avicularia interzooidal, small, teardrop-shaped, typically paired, located at zooidal distolateral corners, with raised, sharply triangular rostrum, directed distolaterally and inwardly, two faint condyles and a pear-shaped opesia. Ovicell endozooidal, small, partly immersed beneath distal autozooid; ooecium cap-like, imperforate, smooth. Vicarious avicularia not observed.

Measurements (µm). ZL 352±28, 309–408 (1, 13); ZW 291±37, 230–348 (1, 13); OpL 244±15, 222– 273 (1, 9); OpW 197±28, 161–232 (1, 9); CryL 85±21, 45–123 (2, 14); GymL 37±17, 16–71 (2, 12); AvL 121±9, 104–136 (2, 20); AvW 75±7, 64– 90 (2, 20); OvL 63±7, 58–68 (1, 2); OvW 172±1, 171–173 (1, 2).

Remarks. This species, originally described from northern Cuba and later identified in Brazil, Malaysia and Mauritius, has also been recorded off the coast of Japan, including locations such as Okinose near Tokyo and Shikoku ( Tilbrook, 1998). As observed by Tilbrook (1998), the size of the autozooids in this species varies both within colonies and across different geographical regions. In the holotype, autozooids average 0.46 × 0.29 mm, whereas specimens from Okinawa display shorter autozooids, averaging 0.35 mm in length but which are of the same width as the holotype.