Hippothoa pacifica Gordon 1984
Creators
Description
Hippothoa pacifica Gordon, 1984
(Fig. 10A, D)
Hippothoa divaricata pacifica Gordon, 1984: 111, text-fig. 10C, F, pl. 43A, B; Gordon et al. 2009: 291.
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.
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. 10A), 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.
Notes
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Linked records
Additional details
Identifiers
Biodiversity
- Collection code
- NIWA
- Family
- Hippothoidae
- Genus
- Hippothoa
- Kingdom
- Animalia
- Material sample ID
- NIWA 1279 , NIWA 1280 , NIWA 144794 , NIWA 26694, 26696, 98202, 98214, 98215 , NIWA 73295 , NIWA 98914
- Order
- Cheilostomatida
- Phylum
- Bryozoa
- Scientific name authorship
- Gordon
- Species
- pacifica
- Taxon rank
- species
- Type status
- holotype , paratype
- Taxonomic concept label
- Hippothoa pacifica Gordon, 1984 sec. Gordon, 2020
References
- Gordon, D. P. (1984) The marine fauna of New Zealand: Bryozoa: Gymnolaemata from the Kermadec Ridge. New Zealand Oceanographic Memoir, 91, 1 - 198.
- Gordon, D. P., Taylor, P. D. & Bigey, F. P. (2009) Phylum Bryozoa - moss animals, sea mats, lace corals. In: Gordon, D. P. (Ed.), New Zealand Inventory of Biodiversity. Vol. 1. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch, pp. 271 - 297.
- Ryland, J. S. & Gordon, D. P. (1977) Some New Zealand and British species of Hippothoa (Bryozoa: Cheilostomata). Journal of the Royal Society of New Zealand, 7, 17 - 49. https: // doi. org / 10.1080 / 03036758.1977.10419334
- De Blauwe, H. (2009) Mosdiertjes van de Zuidelijke Bocht van de Noordzee: Determinatiewerk voor Belgie en Nederland. VLIZ, Oostende, 464 pp.
- Moyano, G. H. I. (1986) Bryozoa marinos chilenos VI. Cheilostomata Hippothoidae: south eastern Pacific species. Boletin de la Sociedad de Biologia de Concepcion, 57, 89 - 135.