Hippothoa pacifica Gordon 1984
- Dataset
- New Hippothoidae (Bryozoa) from Australasia
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Bryozoa
- class
- Gymnolaemata
- order
- Cheilostomatida
- family
- Hippothoidae
- genus
- Hippothoa
- species
- Hippothoa pacifica
description
(Fig. 10 A, D)
discussion
Remarks. Gordon & Ryland (1977) noted the close similarity between European and New Zealand specimens of Hippothoa divaricata, treating them as conspecific. Differences appeared trivial, including “ the autozooidal sinus, which is more U-shaped, and the pore-chambers which are more triangular ” in the New Zealand form. Gordon (1984) described the latter as a new subspecies, H. divaricata pacifica, further noting more-elongate zooeciules, fewer pore-chambers and a kenozooidal ancestrula, but was not able to illustrate the ovicell in the type specimens, noting, however (in remarks on Hippothoa calciophilia Gordon, 1984, p. 110), that the apex of the ovicell in H. divaricata pacifica was bimucronate. The new material gives information on the ovicell, of which the ooecium is indeed bimucronate (Fig. 10 A), appearing as a pair of converging, rimmed, drop-shaped tubular (elevated) pseudopores in non-eroded specimens. De Blauwe (2009) has illustrated by SEM Belgian material of H. divaricata — the sole ovicell shown has an ooecium with more-widely separated elevations, each with a small excavation in it. The specimen additionally shows that the autozooids are proportionally narrower and more-strongly carinate than in the New Zealand form, which is here raised to full species rank. Moyano’s (1986) illustrations of H. divaricata from Chile resemble H. pacifica but the ancestrula has an orifice and operculum. Hippothoa pacifica ranges throughout New Zealand from the vicinity of Raoul Island to southern South Island (c. 29 – 47 ° S), where it seems to be restricted to calcareous substrata. It occurs from shallow coastal water to 826 m depth.
materials_examined
Material examined. Holotype: NIWA 1279 (H- 282), 30.5533 ° S, 178.5267 ° W, 125 m. Paratype: NIWA 1280 (P- 567), same data as holotype. Other material: NIWA 73295, 34.2685 ° S, 173.0248 ° E, 168 m; NIWA 98914, 46.7250 ° S, 165.7750 ° E, 286 m; NIWA 144794, 33.9875 ° S, 171.7508 ° E, 170 – 174 m; NIWA 26694, 26696, 98202, 98214, 98215, 42.8292 ° S, 177.4218 ° W, 826 m.
Name
- Homonyms
- Hippothoa pacifica Gordon 1984