Dartevellopora granulosa, Gordon & Taylor, 2010

Gordon, Dennis P. & Taylor, Paul D., 2010, New seamount- and ridge-associated cyclostome Bryozoa from New Zealand, Zootaxa 2533 (1), pp. 43-68 : 60-61

Dartevellopora granulosa n. sp.

( Fig. 10 A–D )

Material examined. Holotype: NIWA 61254 , from cruise TAN0104, Stn 3, 42°45.48– 42°45.18’S, 179°59.47– 179°59.54’ W, “Graveyard” Seamount, Chatham Rise, 943–1097 m depth, collected 15 April 2001 . Paratypes: NIWA 61255 , same locality as holotype .

Distribution. “Graveyard Seamount Complex”, north-central Chatham Rise, New Zealand, 943–1097 m.

Etymology. Latin granulum, little grain, alluding to the granular surface.

Description. Colony erect, up to 1.8 mm high, with an apron-like base, columnar, devoid of zooidal apertures on the column, and a slightly expanded, flat-topped capitulum 0.95 mm in diameter.

Basal apron smooth, with a granular microstructure of small platey crystallites, the column and capitulum rugose, with a granular-tubercular surface; a few occluded apertures evident in the sides of the column.

Autozooids having relatively short peristomes, apertural diameter 0.18 mm, disposed in a single whorl around the periphery of the capitulum, the centre occupied solely by kenozooidal chambers 0.04–0.07 mm in diameter; additional kenozooids occurring just below the level of the autozooidal apertures, comprising one kenozooid between each pair of apertures.

Gonozooids and ancestrula not seen.

Remarks. This species is so far known only from the type locality, which yielded only two infertile colonies. It differs from its congener D. neozelanica in its rugosity and the disposition of autozooids and kenozooids in the capitulum. Disporella cookae David & Pouyet, 1986 , from 4283 m in the Indian Ocean south of Madagascar, probably belongs to Dartevellopora ; it is interior-walled and, although it has a relatively short column, the zooidal peristomes issue in a single whorl around the periphery of the capitulum.

Figures

FIGURE 10. Dartevellopora granulosa n. sp. (TAN0104 Stn 3). A, profile of entire infertile colony; B, capitulum of a larger colony; C, D, base of column and capitulum of colony in A.