Pteropods are marine holoplanktonic gastropods inhabiting epipelagic and mesopelagic waters with a wide distribution from tropical to polar regions. However, their ontogeny and calcification depth/habitat depth are not well understood. To this end, we analyzed the stable oxygen isotopic composition of five pteropod species (Diacavolinia angulata, Diacavolinia longirostris, Heliconoides inflatus, Limacina bulimoides and Telodiacria quadridentata) from two multicores recovered offshore north-eastern Australia between 15°S and 26°S in the Coral Sea. We applied the Limacina dissolution index (LDX) to evaluate the preservation status of the pteropods, which revealed very good to moderate aragonite preservation at both locations. Comparison of the pteropod shell oxygen isotopic composition with predicted aragonite equilibrium oxygen isotope values implies calcification depths of 50 ± 20 m for D. longirostris and 75 ± 30 m for D. angulata, suggesting that they predominantly calcify in the mixed layer during austral summer. The apparent calcification depths of T. quadridentata and H. inflatus at 90 ± 30 m and 120 ± 30 m at both sites indicate a year-round, lower mixed layer and upper thermocline habitat depth, respectively, while T. quadridentata appear to calcify at temperatures above 22 °C. The calcification depth of L. bulimoides is deeper (100 ± 15 m) at the northern station and shallower (75 ± 30 m) at the southern station that might also hint to a temperature control. The relative narrow calcification depth ranges of the investigated pteropod species in the Coral Sea bolster their potential for reconstructing past ocean conditions at the mixed layer and thermocline.

翼足类动物是海洋全浮游腹足动物，栖息于上层和中层水域，广泛分布于从热带到极地地区。然而，它们的个体发育和钙化深度/栖息地深度尚不清楚。为此，我们分析了在南纬 15° 至 26° 之间在澳大利亚东北部近海回收的两个多核中的五种翼足类物种（Diacavolinia angulata、Diacavolinia longirostris、Heliconoides inflatus、Limacina bulimoides 和 Telodiacria fourdentata）的稳定氧同位素组成。珊瑚海。我们应用 Limacina 溶解指数 (LDX) 来评估翼足类动物的保存状况，结果表明这两个地点的文石保存状况都非常好到中等。翼足类外壳氧同位素组成与预测的霰石平衡氧同位素值的比较表明，长喙翼龙的钙化深度为 50 ± 20 m，角翼龙的钙化深度为 75 ± 30 m，这表明它们在南半球夏季主要在混合层中钙化。两个地点 T.quadridentata 和 H.inflatus 的表观钙化深度分别为 90±30m 和 120±30m，表明全年存在较低的混合层和上部温跃层栖息地深度，而 T.quadridentata 的钙化深度为温度高于 22°C。 L. bulimoides 的钙化深度在北站较深（100 ± 15 m），在南站较浅（75 ± 30 m），这也可能暗示温度控制。珊瑚海中所研究的翼足类物种相对较窄的钙化深度范围增强了它们在混合层和温跃层重建过去海洋条件的潜力。