(Table 1) Distribution of ostracods in Jurassic sediments of DSDP Hole 79-547

Eighteen samples from the Early Jurassic (Hettangian to Pliensbachian) and nine from the Bajocian to Berriasian interval have been examined. The ostracode fauna has been left largely in open nomenclature pending a more detailed study. At least four new genera, listed simply as Gen. nov. A-D sp. nov. have been recognized. Although many new species are present, there is a similarity between this ostracode fauna and that of northwest Europe of comparable age. This is particularly true for the Early Jurassic from which Bairdia guttulae Herrig, 1979, Ptychobairdia cf. aselfingenensis (Lord and Moorley, 1974), Monoceratina scrobiculata Triebel and Bartenstein, 1938, Bairdia sp. 4134 Michelsen, 1975, Ogmoconcha cf. contractula Triebel, 1941, and Paracypris cf. redcarensis Blake, 1876 have been obtained. Monoceratina vulsa (Jones and Sherborn, 1888), present in the Toarcian to Callovian of Britain, is recorded here from a sample provisionally dated as Bajocian to Callovian on foraminiferal evidence. The more important species are illustrated and their distribution recorded in Table 1.本次研究共检视了早侏罗世赫塘期至普林斯巴赫期的18件样品，以及巴柔期至贝里阿斯期地层间隔内的9件样品。该介形类动物群（ostracode fauna）目前大部分暂采用开放命名法（open nomenclature），以待后续开展更深入的分类学研究。本次研究至少识别出4个新属，暂以新属A-D、新种（Gen. nov. A-D sp. nov.）的形式标注。尽管该动物群中存在大量新种，但其与同时期欧洲西北部的介形类动物群具有较高的相似性。这一相似性在早侏罗世样品中尤为显著，本次研究从该时期样品中获得了具斑巴尔德介（Bairdia guttulae Herrig, 1979）、近似阿斯芬褶巴尔德介（Ptychobairdia cf. aselfingenensis (Lord and Moorley, 1974)）、具穴单角介（Monoceratina scrobiculata Triebel & Bartenstein, 1938）、4134号巴尔德介（Bairdia sp. 4134 Michelsen, 1975）、近似收缩尖尾介（Ogmoconcha cf. contractula Triebel, 1941）以及近似雷德卡似星介（Paracypris cf. redcarensis Blake, 1876）。曾在英国托阿尔阶至卡洛夫阶地层中发现的具槽单角介（Monoceratina vulsa (Jones and Sherborn, 1888)），本次研究基于有孔虫类（foraminiferal）证据，在一件暂定为巴柔期至卡洛夫阶的样品中首次记录了该物种。本文对其中较为重要的物种进行了图示，并将其分布信息整理于表1中。