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"Ostracoda of the Cavalli Islands, Northland, New Zealand" by Margaret S. Morley and Bruce W. Hayward

By Margaret S. Morley and Bruce W. Hayward
pp. 79–93


One hundred and twelve species of marine ostracod are recorded from 0-29m depth around the Cavalli Islands, northeast Northland — the most diverse ostracod fauna from a relatively small area (10 km2) documented so far from New Zealand. Thirty of these species are additions to the known Recent (living) ostracod fauna of this country, although only ten have been identified to named species — the Recent Australian species Callistocythere dorsotuberculata paucicostata, Callistocythere keiji, Callistocythere ventroalata, Lankacythere coralloides, Neohornibrookella lactea, Papillatabairdia elongata, Tasmanocypris dietmarkeyseri, Xestoleberis posidonicola, Yassinicythere bassiounii and the fossil (early Miocene) New Zealand species Hemicythere tarakohensis. This brings the total marine ostracod fauna in the New Zealand EEZ to 496 species, of which 229 (46%) are recorded from shelf depths (0-200m) in the Aupourian Province, east of northern New Zealand.

Cluster analysis of 113 quantitative ostracod samples from inner-mid shelf depths east of Northland and Auckland resulted in the recognition of 14 subassociations in four associations. The majority of the Cavalli faunas cluster together in three subassociations with the most diverse faunas and lowest species dominance, characterised by common Loxoconcha punctata. Subdominant in the shallowest subassociation is Xestoleberis olivacea, whereas Neonesidea amygdaloides, Quadracythere biruga and Ambostracon pumilum are subdominant in the other two subassociations in coarser sediment in the current-swept Cavalli Passage. One distinctly different unclustered Cavalli Islands ostracod fauna occurs in strong current-swept, shell gravel between rocky islets at 9m depth and is strongly dominated (48%) by Xestoleberis chilensis austrocontinentalis with subdominant Polycope sp. and Parapolycope cf. loscobanosi.

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