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OSTRACODA OF THE HAURAKI GULF, NEW ZEALAND

Margaret S. Morley and Bruce W. Hayward
Records of the Auckland Museum
Vol. 48 (2012), pp. 51-75
Stable URL: http://www.jstor.org/stable/42905926
Page Count: 25
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OSTRACODA OF THE HAURAKI GULF, NEW ZEALAND
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Abstract

One hundred and twenty-four species of benthic marine ostracods are recorded from the Hauraki Gulf (0-130 m water depth) and 113 of these are illustrated. Sixty-eight have previously been recorded from the modern New Zealand fauna. Added to the New Zealand fauna are three Australian species: Callistocythere dedeckkeri Yassini and Jones, 1995, Cobancythere navicuUris Yassini and Jones, 1995, Neocytherideis annechrkeae Yassini and Jones, 1987; and two fossil New Zealand species: Quadracythere chattonensis Hornibrook, 1952 (Oligocene), and Aysegulina quadrazea (Hornibrook, 1952) (Eocene-Oligocene). Fifty-four taxa are unable to be firmly identified to named species. Cluster and correspondence analysis of quantitative census counts on 82 faunal samples from throughout the Hauraki Gulf enables the recognition of ten associations, with faunal composition progressively changing from the sheltered brackish estuaries at the head of the gulf northwards to the clearer deeper water around the entrance to the gulf. An association strongly dominated by Leptocythere lacustris occurs in the lowest salinity environments in the upper parts of Tamaki Estuary and the Waitemata Harbour; Callistocythere neophna strongly dominates a mid-high tide association in mud, salt marsh or mangroves around the edge of Mahurangi and Waitemata Harbours and Firth of Thames; a Microcytherura hornibrooki - Procythereis lytteltonensis association occurs intertidally to subtidally around the edge of harbours; a Munseyelh tumida - Callistocythere neophna association occurs in mud at low tide to 20 m depth inside sheltered bays on Great Barrier, Waiheke and Ponui Islands, and in Waitemata Harbour and Tamaki Estuary; Munseyella sp. 10 strongly dominates an association widespread in the low tidal-subtidal channels of the Waitemata Harbour and Tamaki Estuary. Corallina turf in intertidal rock pools has its own distinctive association dominated by Xestoleberis olivácea and Sclerochilus sp. a. With increasing depth the middle and outer parts of the Hauraki Gulf are four associations dominated by Paracypris zeaUndica -Callistocythere obtusa -Waiparacythereis joanae (0-14 m), Kotoracythere formosa - Cytherella hemipuncta (12-17m), Munseyella brevis (22-50 m), and Glencoeleberis thomsoni (30-130 m).

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