61. OSTRACODES—LEG 34

D.R. Wall, Burmah Oil and Gas (BOAG), P.O. Box 11279, Santa Rosa, CaliforniaPatrick G. Quilty, West Australian Petroleum Pty. Limited (WAPET),

G.P.O. Box C1580, Perth, Western Australia

During preparation of foraminifera for another paper(Quilty, Planktonic Foraminifera, this volume), os-tracodes were occasionally encountered and routinelyseparated. Fifty-seven samples yielded ostracodes,usually only one or two specimens but rarely up to 11.

It was hoped that a more detailed study could bemade but time has prevented this. One author (D.R.W.)examined the specimens and identified them generically.Although time has made it impossible to carry the studyfurther, it is considered worthwhile to present even thislimited information because ostracodes from DSDPsamples have received little attention. The faunas aregenerally sparse but well preserved and can be regardedas typical of the deep-water environment, each genushaving been previously described from abyssal depths(Table 1).

Representatives of most forms are illustrated on theaccompanying Plate 1 (photography by W.K. Copley ofWAPET). Krithe is the dominant genus. This has beenprovisionally divided into three species, though withmore detailed work further specific distinction may bewarranted. Several good specimens of Echinocythereis,Bairdia, and Hermanites must be regarded as the"nearest generic fit" as the specimens show certainfeatures slightly at variance with the generic diagnosis.The genus Cytheropteron is represented by a smallnumber of specimens belonging to a few species. Theidentification of Pterygocythereis and Macrocypris mustbe regarded as provisional as they are based on a fewjuvenile specimens.

TABLE 1Distribution of Ostracodes From DSDP Leg 34

HOLEAGE

CORE

SPECIES^\^

Echinocythereis sp.lKrithe sp.lK.sp.2Cytheropteron sp. 4? Krithe sp.Bαirdiα sp.Hermanites spCytheropteron sp.lKrithe sp. indet.Cytheropteron sp. 2? Pterygocythereis sp? Echinocythereis sp.Ostracoda indet.

LEGENDR

L

319PLIOCENl

1

5,4

2-4

4

RP

CVJ

3,10

1-10

3

LmRf

rtlOCENE

4

2,8

3-8

5

Lt

RlRj

5,4

2-4

4

L)Rj

6,1

00

-10

2

Rj

Right valve

Left valve

Middle

5

2,9

0-9

2

Lj

3,9

0-9

2

RmRj

5,9

0-9

2

Rj

C

fm

6,9

0-9

2

S

RjLa

oü

Ra

6

4,1

4-1

6

jfr

5,12

7-12

9

Sci

Carapace

female

male

Rfj

7

3,7

1-7

3

RLjS

f r

4,8

5-8

7

Lj

a

js

6,11

9-12

1

ca

8

3,14

5-14

0

Ra?

5,6

0-6

2

cp

6,5

0-5

2

Rf

üü

La

adult (undiff.)

juvenile

several

91,

118-

120

Lf

Rj

2,5

6-5

8

LRa

Pfr

3,4

8-5

0

Lf

Rj

o

cj

! Early

I0

1,9

2-9

4

Lp

Rj

Rj

3,5

8-6

0

S

Rfr

4,12

5-12

7

S

Rj

üü

La

La

II

1,12

2-12

4

CJ

Ljfr

penultimate instar

fragment

737

D. R. WALL, P. G. QUILTY

HOLEAGE

CORE^ \ S E C T I O N }

^^^DEPTHSPECIES^^L

Krithe sp. 3K. sp. 1K. sp. 2Echinocythereis sp.lHermαnites sp. 1? Krithe sp.? Mαcrocypris sp.? Echinocythereis sp.2Krithe sp.Cytheropteron sp. 3C. sp.Bαirdiα sp.Ostrαcodα indet.

TABLE 1

Early MIOCENE

II

2,3

0-3

2

ca

3,5

0-5

2

Lf

4,3

3-3

5

RiLmjS

Rm

6,6

6-6

8

Rm

fro

üo

LjRiLj

12

1,12

4-12

6

Lj

fr

2,4

0-4

2

fr3,1

00-1

02

Ra

oü

Ra

Rj

— Continued

320QUAT.

1

!O

S

2,5

1-5

3

S

Early

2

1,8

0-8

2

Rmj

S

oü

fr

MIOCENE

3

1,10

5-10

7

Rm

fr

2,2

7-2

9

RiS

Ri

La

LRj

3,1

0-1

2

Ra

Lp

fr

4,6

-8

Ra

5,

14-1

6

RiSLj

6,

131-

133

SS

La

fr

oo

SRL)

EarlyMIOCENE

1

2,5

-7

LjLRj

oo

LRj

LjR)

320 BOLIGOCENE

2

1,5

4-5

6

Re j

2,1

0-1

2

LRf

Lf?La?

3,5

0-5

2

Ra

Ra

4,3

0-3

2

S

5,3

5-3

7

Ri

JC

oo

SRjRLj

Ljfr

Rj

PLATE 1Representatives of most ostracode forms, Leg 34,

Deep Sea Drilling Project

Figures 1,2 Krithe sp. 1; 319-11-3, 50-52 cm.1. ×50.

Figures 3, 4 Krithe sp. 1; female carapace; ×45; 319-5-6, 90-92cm.

Figures 5, 6 Krithe sp. 2; 319-5-2, 90-92 cm.5. ×80.6. ×IOO.

Figure7 Krithe sp. 3; ×35; 319-11-2, 30-32 cm.

Figures 8, 9 Bairdia sp.; ×60; 319-8, CC.

Figures 10, 11 Hermanites sp.; ×40; 319-8-5, 60-62 cm.

Figure 12 Echinocythereis sp.; ×45; 319-1-5, 42-44 cm.

Figures 13, 14 Pterygocythereis sp.; 319-10-4, 125-127 cm.13. ×60.14. ×70.

Figures 15, 16 ?Macrocypris sp.; 319-12, CC.15. ×80.16. ×90.

Figures 17, 18 Cytheropteron sp. 1; 319-8-6, 50-52 cm.17. ×35.

18. ×50.

Figures 19,20 Cytheropteron sp. 2; ×35; 319-10, CC.

Figure21 Cytheropteron sp. 3; ×55; 320-3-2, 27-29 cm.

Figures 22, 23 Cytheropteron sp. 4; 319-5-6, 90-92 cm.22. ×35.23. ×40.

738

OSTRACODES

PLATE 1

739