T A N E 28,1982

F O R A M I N I F E R A A N D O S T R A C O D A I N N E A R S H O R E S E D I M E N T S , L I T T L E B A R R I E R I S L A N D ,

N O R T H E R N N E W Z E A L A N D

by Bruce W. Hayward New Zealand Geological Survey, P .O . B o x 30368, Lower H u t t

S U M M A R Y

One hundred and twenty-nine species of foraminifera and forty-five species of ostracoda were found in five samples of nearshore sediment (clean medium sand, shelly medium sand, shelly very coarse sand) taken from 4-10 m depth off the south-western corner of Little Barrier Island, east coast of Northland.

The foraminiferal faunas are dominated by Pileolina zealandica, Discorbis dimidiatus, Quinqueloculina seminula, Elphidium charlottensis, Textularia sp. and Rosalina irregularis. These Little Barrier faunas are notable however, for the low abundance of Cibicides marlboroughensis, C. corticatus, Elphidium novozealandicum, Notorotalia olsoni and Gaudryina convexa, which elsewhere in northern New Zealand are codominant with the species above in similar shallow water, clean sand or shelly sand in exposed or current-swept environments.

The ostracod faunas are dominated by Callistocythere obtusa, Waiparacythereis joanae, Loxoconcha punctata, Aglaiocypris sp. and Xestoleberis olivacea, and in taxonomic composition are quite distinct from shallow water faunas previously described from the west coast of Northland.

Three forminifera (Hauerina pacifica, Entomorphinoides cf. karenae, Spirillina denticulogranulata) and two ostracoda (Polycopsis cf. loscobanosi, Ponticocythereis militaris) are recorded from New Zealand for the first time.

INTRODUCTION

Little Barrier Island (latitude 36°12'S, longitude 175°05'E) lies in the middle of the entrance to the Hauraki Gulf, midway between Great Barrier Island and the east coast of southern Northland. Five samples of bottom sediment were taken from inshore waters (4-10 m depth) adjacent to the boulder spit of Te Titoki Point on the south-west side of the island (Fig. 1, Table 1) during the Auckland University Field Club scientific camp in August 1981.

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Fig. 1. Location of sampling stations (inset) around Te Titoki Point, Little Barrier Island, north-east New Zealand.

M E T H O D S

Samples (500 cc) of the top 5-10 cm of bottom sediment were collected by hand by Dr R.V. Grace while S C U B A diving. In the laboratory grain size analyses were carried out using sieves and the samples then prepared for microfaunal studies by washing out any mud and concentrating the shells (by floating off using carbon tetrachloride).

From a split of the floated material, 100 benthic foraminifera were picked and mounted, to give a crude quantitative estimate of the fauna. No attempt was made to distinguish live from dead tests. The remaining float was scanned and specimens of additional taxa were picked to give a more complete list of the species (Appendix I).

From a second split of the floated material, 200 ostracod valves (one

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articulated carapace = 2 valves) were picked and mounted, to give a crude quantitative estimate of the ostracod faunas. Specimens that were alive when collected were identified by the presence of preserved soft parts and noted (Appendix II).

S E D I M E N T S

Grain size terminology follows Folk (1968). A l l samples are clean sediment, containing no mud. Stations 1-4 were located beyond the subtidal extent of the boulder deposits that surround Te Titoki Point. Stations 2 and 3 are medium sand lacking anything larger than sand-size grains. Stations 4 and 5 contain 12% and 40% gravel-size shell fragments respectively and are shelly and very shelly medium sand.

Station 5 was collected from a sandy patch between weed-covered boulders. It contains 15% gravel-size shell fragments and is a shelly very coarse sand.

F O R A M I N I F E R A L M I C R O F A U N A S (LIVE P L U S D E A D )

Plank tics Faunas from the five stations contain 0-2% planktic foraminifera. The

dominant taxon is Globigerina falconensis. Diversity is low compared with more abundant planktic faunas that occur further offshore in deeper water in the outer part of the Hauraki Gulf (pers.obs.).

Benthics The five benthic faunas have similar overall taxonomic composition;

most probably a result of post-mortem transportation and mixing of tests.The faunas differ considerably however, in the relative abundance of the dominant taxa (Fig. 2,3) and this is interpreted to be a result of the differing local environments.

The faunas contain 1-20% agglutinated foraminifera (Textulariina), 19-36% calcareous, porcelaneous (Miliolina) and 54-77% Rotaliina. Diversity is high (Fisher alpha index = 15-22).

The dominant taxa in these nearshore sediments are Pileolina zealandica (0-18%), Discorbis dimidiatus (3-12%), Quinqueloculina seminula (2-25%), Elphidium charlottensis (1-14%), Textularia sp. (1-17%) and Rosalina irregularis (2-11%).

The two medium sand samples (stns 2,3) lacking coarse-shell have very similar faunas, both dominated by P. zealandica, D. dimidiatus, Q. seminula, E. charlottensis and Rosalina bradyi Station 4, 300 m to the east and with 12% shell (less than 2 mm diameter), has a similar group of dominants but Q. seminula (25%) is by far the most abundant. Subdominants in decreasing order of abundance are P. zealandica, E.

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charlottensis, R. irregularis, Miliolinella subrotundata and D. dimidiatus (Fig. 2).

The very shelly medium sand on the north-west side of Te Titoki Point (stn 1) is somewhat different, being dominated (in decreasing order) by E. charlottensis, Q. seminula, R. irregularis, M. subrotundata and Gavelinopsis hamatus (Fig. 2) and lacks P. zealandica.

The coarsest sample (stn 5), collected from between weed-covered boulders, is the most different. The fauna is dominated (in decreasing order) by Textularia sp., R. irregularis, D. dimidiatus, M. subrotundata and Neoconorbina n.sp. (Fig. 2).

OSTRACOD M I C R O F A U N A S (LIVE P L U S D E A D )

Like the foraminifera, the five ostracod faunas have broadly similar overall taxonomic composition but the relative abundance of the dominant taxa (Fig. 2,4) varies greatly. The dominant taxa in these nearshore sediments are Callistocythere obtusa (7.5-22.5%), Waiparacythereis joanae (0-20.5%), Loxoconchapunctata (2-18%), Aglaiocypris sp. (1-32.5%), and Xestoleberis olivacea (0-16%).

The two most similar faunas are those in the medium sand lacking coarse shell (stns. 2,3). Both are dominated (in decreasing order) by C. obtusa and W. joanae and have subdominant Hemicythere sp., Ambostracon cf. pumila, Kotoracythere sp., L. punctata and Semicytherura hexagona (Fig. 2).

The fauna of the shelly medium sand of station 4 differs significantly in that it is dominated by the large, smooth-shelled ostracod Aglaiocypris sp. (32.5%). Subdominants (in decreasing abundance) are W. joanae, L. punctata, C. obtusa and Copytus novae-zealandiae (Fig. 2). The fauna of the very shelly medium sand of station 1 differs from the previous three in its dominance by X. olivacea (16%) but otherwise it is quite similar with subdominants C. obtusa, W. joanae, Anglaiocypris sp. and L. punctata

Like the foraminifera, the ostracod fauna of the coarsest sample (stn. 5), collected from between weed-covered boulders, is the most different. It is dominated by L. punctata, C. obtusa and Cytheropteron curvicaudum (each 14-18%) with subdominant Polycope sp. and Neonesidea cf. amygdaloides (Fig.2). Also notable is the absence or virtual absence (0-1%) of several of the abundant species in other samples - W. joanae, Aglaiocypris sp., X. olivaeea, Hemicythere sp. and Kotoracythere sp.

N E W R E C O R D S F R O M N E W Z E A L A N D

One hundred and twenty-eight species of foraminifera and forty-five

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FORAMINIFERA Pileolina zealandica Discorbis dimidiatus

Quinqueloculina seminula Elphidium charlottensis

Textularia sp, Rosalina irregularis

Miliolinella subrotundata Neoconorbina n . s p .

Rosalina bradyi Gavelinopsis hamatus Patellinella inconspicua

Quinqueloculina colleenae Trifarina n . s p .

Neoconorbina pacifica Elphidium novaezealandiae

Quinqueloculina lamarckiana Neoconorbina harmeri

OSTRACODA Callistocythere obtusa

Waiparacythereis joanae Loxoconcha punctata

Aglaiocypris s p . Xestoleberis olivacea

"Hemicythere" s p . Ambostracon c f . pumila

Polycope s p . Cytheropteron curvicaudum;

Kotoracythere s p . Semicytherura sericava Semicytherura hexagona

Copytus novaezealandiae Neonesidea c f . amygdaloides

Quadracythere t rune u la Semicytherura c f . costellata

Quadracythere biruga ?Propontocypris Sp .

Pontocythere s p . Polycopsis c f . loscobanosi

Fig. 2. Histograms of common foraminifera and ostracods (more than 4%) in the five nearshore samples, Little Barrier Island.

species of ostracoda are present in the five samples from Little Barrier (Appendices I and II). Of these, three foraminifera and two ostracoda are records of species not previously recorded from New Zealand.

Foraminifera 1 .Hauerina pacifica Cushman Fig. 5a

Hauerina pacifica Cushman 1917: 64, pl.21, fig. 2. Hauerina is a compressed miliolid with a cribrate aperture.

H. pacifica is more inflated and irregularly coiled than H. fragilissima (Brady), the only other species of Hauerina previously recorded from around New Zealand, i f . pacifica was described from the Hawaiian Islands and has been recorded from a number of other tropical Pacific Islands. 2. Entomorphinoides cf. karenae McCulloch, Fig. 5f.

Entomorphinoides karenae McCulloch 1977 : 211, pi. 92, fig. 28. Entomorphinoides belongs to the Glandulinidae (possesses an

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Fig. 3. Common foraminifera in nearshore sediment samples. Little Barrier Island, a. Pileolina zealandica, plastogammic pair (FP3491) x 120; b. Discorbis dimidiatus (FP3164) x 35; c. Quinqueloculina seminula (FP3038) x 45; d. Elphidium charlottensis (FP3160) x 70; e. Textularia sp. (FP3492) x 100; f. Rosalina irregularis (FP32O0) x 60; g. Mitiolinella subrotundata (FP3174) x 70; h. Neoconorbina n.sp. (FP3493) x 70.

Fig. 4. Common ostracoda in nearshore sediment samples, Little Barrier Island, a. Callistocythere obtusa (OP1114) x 60; b. Waiparacythereis joanae (OP1113) x 50; c. Loxoconcha punctata (OP1115) x 5t>, d. Aglaiocypris sp. (OP1116) x 30; e. Xestoleberis olivacea (OP1097) x 80; f. Hemicythere sp. (OP1098) x 60; g. Ambostracon cf. pumila (OP1099) x 50; h. Polycope sp. (OP1117) x 90; i. Cytheropteron curvicaudum (OP1118) x 75.

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T A B L E 1. Stat ion data.

Stat ion Depth Sediment N Z G S N o *

1 2 3 4 5

10 m very shelly medium sand F 201907 F 201908 F 201909 F 201910 F 201911

7 m clean medium sand 4 m clean medium sand

10 m shelly medium sand 7.5 m very shelly very coarse sand

* Sample catalogue number of the Micropaleontology Section, N . Z . Geological Survey.

internal entosolenian tube) and is distinguished by its smooth, elongate, compressed test; subquadrate in cross-section; symmetrical biserial sigmoid chamber arrangement, and fissurine aperture. This New Zealand specimen is very similar to E. karenae (California) but has a somewhat shorter entosolenian tube. Species of Entomorphinoides occur in many parts of the tropical and subtropical Pacific today (McCulloch 1977). This is the first record of this genus from New Zealand, either fossil or Recent. 3. Spirillina denticulogranulata Chapman Fig. 5b, c

Spirillina denticulo-granulata Chapman 1907 :133, pi. 10, fig. 6a-c. A highly ornamented species with pustules on one side and short

radiating transverse costae on the other. Originally described from Victoria, Australia, S. denticulogranulata also occurs in other New Zealand Recent samples (pers.obs.) from the Cavalli Islands (F201749 and many others), Rangaunu Bay (F201011), Leigh (F201352) and Fouveaux Strait (F201210).

Ostracoda 1. Polycopsis cf. loscobanosi (Hartmann) Fig. 5d

Polycope loscobanosi; Hartman 1959 : 208, fig. 53-60. Polycopsis is distinguished from Polycope on its soft parts and the

serrations along the anterior border of the carapace. This New Zealand material is very similar to P. loscobanosi, described from shallow water in the tropical east Pacific. This' is the first record of this genus from New Zealand, either fossil or Recent. It also occurs in a sample taken at 100 m depth off Oamaru (F201013, pers. obs.). 2. Ponticocythereis militaris (Brady) Fig. 5e.

Cythereis militaris Brady 1866:385, pl.61, fig. 9a-d. Ponticocythereis is a distinct trachyleberidinid genus with a strong,

subquadrate carapace ornamented with numerous coarse pointed or blade-like spines around the margin and along a median ridge. It appears to be confined to the South-west Pacific and Australia (Wheat ley and T i t t e r ton, 1981) and this is the first record of the genus from New Zealand, fossil or Recent. P. militaris, described from Victoria (Australia), also occurs in other New Zealand Recent samples (pers.obs.)

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Fig. 5. Foraminifera and ostracoda not previously recorded from Recent New Zealand sediments, a Hauerina pacifica (FP3494) x 70; b, c. Spirillina denticulogranulata (FP3495, 3496) x 90-, d. Polycopsis cf. loscobanosi (DP1119) x 65; e. Ponticocythereis militaris (OP 1120) x 45; f. Entomorphinoides cf. karenae (FP3497) x 80.

from Three Kings (F201012), Castle Point (F201010), D'Urville Island (F201000) and Oamaru (F201013) at depths ranging from 20 to 200 m.

DISCUSSION

Live fauna Although no attempt was made in this study to distinguish live from

dead foraminifera, previous studies in similar environments off northern New Zealand (Hayward 1982) have shown that the dominant taxa in the total fauna are generally also the dominant taxa in the in-situ live fauna. Post-mortem transport of tests undoubtedly occurs but is usually insufficient to blur major faunal differences between different sample stations. Thus it seems reasonable to conclude that faunal dominants in the live plus dead Little Barrier counts reflect the faunal dominants in the live fauna and tend to average out any irregularities that may emerge due to seasonal changes in the live foraminiferal faunas.

Observations on the ostracods in these Little Barrier samples indicate that only a small proportion (usually less than 5%) of the fauna was alive when collected. Usually the individuals found alive are among the most common taxa in each sample and it seems acceptable to deduce that the dominant taxa in the ostracod counts lived close to the sampling location.

It is interesting to note that the two stations (2 and 3) with most s i m i l a r foraminiferal faunas also have the most similar ostracod faunas.

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Other parallels between the foraminiferal and ostracod faunas include a) the large difference between the fauna in shelly very coarse sand among boulders (stn. 5) and those of medium sand (stns. 1-4), and b) the marked dominance of a single species (Quinqueloculina seminula, Anglaiocypris sp.) in station 4 faunas compared with the co-dominance of two or more species in the other faunas.

Foraminifera The abundance of Elphidium charlottensis, Pileolina zealandica,

Discorbis dimidiatus and miliolids (especially Quinqueloculina seminula) in the medium sand (stns. 1-4) around Little Barrier is shared with many other faunas that occur in clean sand or shelly sand in exposed, semi-exposed or current-swept localities at 0-30 m depth around northern New Zealand. Little Barrier faunas however, have low numbers of Cibicides marlboroughensis, Elphidium novozealandicum and Notorotalia olsoni in contrast to the abundance of these taxa in similar sediments around the Cavalli Islands (Hayward 1982), eastern Bay of Islands (Hayward 1981a), and elsewhere in the outer Hauraki Gulf (Thompson 1975). Little Barrier faunas also have low numbers of Cibicides corticatus and Gaudryina convexa which are abundant in the fine to medium sand off Cuvier Island (Hayward and Grace 1981).

The dominance of Textularia sp. in the shelly very coarse sand amongst boulders at Little Barrier is an unusual feature not previously noted from normal marine, inshore sediments around New Zealand.

These Little Barrier sediments contain a number of warm-water taxa (Hayward 1980) that are unknown in New Zealand waters south of the northern North Island. They include Hauerina pacifica, Spiroloculina angulata, Triloculina bertheliniana, Buliminoides williamsoni, Loxostomum limbatum costulatum, Neoconorbina n.sp., N. harmeri, N. pacifica, Rugidia simplex and Sigmavirgulina tortuosa.

Ostracoda Studies on marine ostracod faunas around New Zealand are few. The

only previous quantitative faunal study in the north was at Kawerua on the west coast of Northland (Hayward 1981b). Here two faunas were recognised - an in situ tide pool fauna dominated by Loxoconcha punctata with subdominant Xestoleberis olivacea, Hemicythere sp. and Ambostracon pumila and a displaced, exposed inner shelf fauna dominated by Kotoracythere sp. and Waiparacythereis joanae.

These Little Barrier faunas, while showing some similarity to those at Kawerua (e.g. abundance of W. joanae, L. punctata, Kotoracythere sp. in some samples), are quite distinct. The most obvious difference is the overall abundance in Little Barrier sediment of Callistocythere obtusa and local abundance of Aglaiocypris sp., Cytheropteron curvicaudum,

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Polycope sp., Polycopsis cf. loscobanosi, Semicytherura hexagona and S. sericava and their absence or virtual absence from the Kawerua material. A number of taxa found commonly in the Kawerua faunas are virtually absent at Little Barrier (e.g. Callistocythere neoplana, Cushmanidea sp., Elofsonia sp., Kotoracythere formosa, Loxocythere crassa, Munseyella tumida, Pontocythere hedleyi and Semixestoleberis taiaroaensis).

The reasons for these differences are unclear and only further studies will show whether they are due to habitat differences or to differences between the ostracod faunas on different coasts of Northland.

A C K N O W L E D G E M E N T S

I am grateful to Roger Grace for collecting the five sediment samples for me and to George Scott and Norcott de B . Hornibrook for reviewing the manuscript . The S E M photographs were taken by B a r r y B u r t and H u g h Morgans , and F i g . 5f drawn by R o n Brazier .

R E F E R E N C E S

B r a d y , G . S . 1866 : O n new or imperfectly known species of Ostracoda. Transactions Zoological Society of London 5:359-393.

Chapman, F . 1907 : Recent foraminifera of V i c t o r i a : some l i t tora l gatherings. Journal of Quekett Microscopical Club 10(61): 117-147.

Cushman, J . A . 1917 : A monograph of the foraminifera of the N o r t h Paci f ic Ocean: P a r t V I - Mi l io l idae . Uni ted States Nat i ona l M u s e u m B u l l e t i n 71.

Fo lk , R . L . 1968: "Petro logy of Sedimentary R o c k s " . Hemphi l l s , A u s t i n , Texas. 170 p. H a r t m a n n , G . 1959: Zur Kenntnis der lotischen Lebensbereiche der pazifischen K u s t e von

E l Salvador unter besondeer Berucksc icht igung seiner Ostracodenfauna. Kieler Meeresforsch. 15(2): 187-241.

H a y w a r d , B . W . 1980 : New records of warm-water foraminifera from north-eastern New Zealand. Tane 26:183-188.

H a y w a r d , B . W . 1981a: Foraminifera i n nearshore sediments of the eastern B a y of Islands, northern New Zealand. Tane27:123-134

H a y w a r d , B . W . 1981b : Ostracod fauna of an intert idal pool at Kawerua , Nor th land . Tane 27:159-168.

H a y w a r d , B . W . 1982: Benthic foraminiferal (Protozoa : Sarcodina) associations of inner shelf sediments around the Cava l l i Islands, north-east New Zealand. New Zealand Journal of Marine and Freshwater Research 16: 27-56.

H a y w a r d , B . W . & Grace, R . V . 1981 : Soft bottom macrofauna and foraminiferal microfauna off Cuvier Island, north-east New Zealand. Tane 27: 43-54.

M c C u l l o c h , I. 1977 : "Qua l i ta t ive Observations on Recent Foramini feral Tests w i t h E m p h a s i s on the E a s t e r n Pac i f i c " . Univers i ty of Southern Cal i fornia, Los Angeles, 3 vols.

Thompson, I .C. 1975 : Recent foraminifera and superficial sediments of an area of the continental shelf and upper slope east of the N o r t h Is land, New Zealand. Unpubl ished M S c thesis, Univers i ty of A u c k l a n d . 97 p.

Whatley , R . C . & Titterton, R. 1981 : Some new Recent Podocopid Ostracoda from the Solomon Islands, South-west Pacific. Revista Espanola de Micropaleontologia 13(2) : 157-170.

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Stat ion 1 2 3 4 ft Buliminoides williamsoni (Brady) 1 2 1 1 Cassidulina carinata S i lvestr i X X

Cibicides corticatus E a r l a n d 1 1 1 1 1 Cibicides marlboroughensis V e l l a 1 1 1 Cibicides cf. ungerianus (d'Orbigny) 2 X X

Cymbaloporetta bradyi (Cushman) 3 X 1 Dentalina elegans d 'Orbigny 1 X

Discorbinella vitrevoluta (Hornibrook) 1 X X

Discorbis dimidiatus (Parker & Jones) 3 10 12 4 8 Dyocibicides biserialis Cushman & Valentine 1 3 2 2 Elphidium charlottensis V e l l a 14 6 8 6 1 Elphidium novozealandicum Cushman 3 3 3 X 3 Elphidium oceanicum Cushman 2 3 1 Elphidium simplex Cushman 1 X X

Elphidium sp. X X

Entomorphinoides cf. karenae M c C u l l o c h X

Evolvocassidulina orientalis (Cushman) 2 2 1 Fissurina biumbonata M c C u l l o c h X

Fissurina claricurta M c C u l l o c h X X

Fissurina cf. laevigata Reuss X

Fissurina lucida (Williamson) X

Fissurina cf. marginata (Montagu) 1 Fissurina orbignyana Sequenza X

Fissurina semialata (Ba lkwi l l & Mil lett ) X

Gavelinopsis hamatus V e l l a 6 1 2 3 Glabretella margaritaceaus (Earland) X

Globocassidulina canalisuturata Eade 1 X

Globocassidulina minuta (Cushman) i X X 1 Guttulina irregularis (d'Orbigny) 1 X

Gypsina vesicularis (Parker & Jones) X X 1 Hanzawaia bertheloti (d'Orbigny) X X

Hanzawaia complanata (Sidebottom) X

Heronallenia pulvinulinoides (Cushman) X

Karreria maoria (Finlay) X

Lagena sp. X

Lenticulina antarcticus (Parr) 1 Lenticulina australis (Parr) X X

Loxostomum limbatum costulatum (Cushman) X X

Loxostomum karrerianum (Brady) X X

Mychostomina n.sp. X X X

Neoconorbina harmeri (Heron-Al len & Earland) 5 X 1 Neoconorbina pacifica Hofker 4 3 3 3 Neoconorbina n.sp. 2 1 1 2 7 Nonion cf. simplex (Karrer) X

Notorotalia depressa V e l l a X 1 Notorotalia olsoni V e l l a 1 X 1 Oolina globosa (Montagu) X

Oolina hexagona (Williamson) X

Oolina melo d 'Orbigny 3 X 2 X

Oolina spp. X

Patellina corrugata Wi l l i amson X

Patellinella inconspicua (Brady) 3 3 5 4 2 Pileolina calcarata (Heron-Allen & Earland) X 1

6 4

Stat ion 1 2 5 4 5

Pileolina patelliformis (Brady) l 1 Pileolina radiata Ve l la X 2 3 Pileolina zealandica V e l l a 18 14 9 2 Planaglabratella opercularis (d'Orbigny) 3 2 3 1 Planorbulina acervalis B r a d y 2 1 Pullenia quinqueloba (Reuss) X

Rectobolivina columellaris (Brady) X X

Rosalina irregularis (Rhumbler) 7 2 3 6 11 Rosalina paupereques V e l l a 1 X 1 1 Rosalina cf. valvulata (d'Orbigny) X

Rugidia simplex Col l ins 1 Sigmavirgulina tortuosa (Brady) X 2 X

Sigmoidina silvestri Cushman & Ozawa X

Sigmomorphina lacrimosa Ve l la X

Siphouvigerina vadescens (Cushman) X X

Spirillina denticulogranulata Chapman X X X

Spirillina vivipara simulata McCul l o ch X X X 1 Svratkina australiensis (Chapman, Parr & Collins) X X

Trifarina carinata (Cushman) 1 X

Trifarina n.sp. 4 1 2 3 x Virgulopsis turris (Heron-Allen & Earland) X

Zeaflorilus flemingi (Vella) 1

% Textular i ina 5 3 4 1 20 % M i l i o l i n a 26 21 19 36 26 % Rotal i ina 69 76 77 63 54 Divers i ty (Fisher alpha index) 22 15 20 19 19

P L A N K T I C S Globigerina falconensis B l o w X X X X

Globigerina quinqueloba N a t l a n d X

Globigerinoides ruber (d'Orbigny) X

Globigerinoides sacculifer (Brady) X

Globorotalia inflata (d'Orbigny) X

Orbulina universa d 'Orbigny X

% planktics 1 0 1 1 2

A P P E N D I X II - Ostracoda in Little Barrier sediment samples. Arabic numberals = number of valves in pick of 200 divided by 2. * = includes live specimens.

Stat ion 1 2 3 4 5

Aglaiocypris sp. 7.5 2 1 32.5* 1 Ambostracon cf. pumila (Brady) 8 4.5 5- 3.5 Anchistrocheles sp. 1 Callistocythere obtusa Swanson 13* 17 22.5 7.5 13.5* Callistocythere sp. 2 Copytus novaezealandiae (Brady) 1 1 6.5 1 Cypridinodes sp. 1 Cytherelloidea willetti Swanson 3 3.5 3.5* Cytheropteron confusum Hornibrook 1 2 1 Cytheropteron curvicaudum Hornibrook 1 1.5 1 15* Cytheropteron sp. 0.5 Elofsonia sp. 1 1 1

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Stat ion 1 2 3 4 5

Eucythere mytila Homibrook i 1 Hemicythere munida Swanson 2 1 1 2.5 "Hemicythere" sp. 3 6* 11 Hemicytherura gravis Hornibrook 2 3 Hemicytherura pentagona Hornibrook 1 Kangarina sp. 1 Kotoracythere sp. 4 9 2 4.5 Loxoconcha punctata Thomson 7 7 2 11 18 Loxocythere crassa Hornibrook 2 1 Loxocythere kingi Hornibrook 1 Microxestoleberis spp. 3 Munseyella tumida Swanson 1 Neonesidea cf. amygdaloides (Brady) 0.5 1* 1 6.5* Neonesidea sp. 2 Paradoxostoma spp. 1 1 Polycope sp. 10 Polycopsis cf. loscobanosi (Hartmann) 4* 1 Ponticocythereis militaris (Brady) 0.5 Pontocythere sp. 1 4.5* Propontocypris sp. 5.5* Quadracythere biruga Hornibrook 1 5 1 1 3 Quadracythere truncula (Brady) 2 6 2.5 2 3 Sclerochilus sp. 0.5 2.5 Semicytherura cf. costellata (Brady) 4 2 1 5.5* Semicytherura hexagona (Hornibrook) 4 2 8.5 2 Semicytherura sericava (Hornibrook) 7.5* 1 3 2 Semixestoleberis taiaroaensis .Swanson 1 1 Semixestoleberis sp. 1 Waiparacythereis joanae Swanson 10.5 10 20.5 14.5 Xestoleberis olivacea B r a d y 16 5 3 3.5 Xestoleberis sp. 1 1.5

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