Ross Sea Pycnogonids

The biodiversity research expedition TAN0204 with RS Tangaroa to the Ross Sea in 2004 yielded a new collection of 2,687 specimens of pycnogonids. As much as 25 dfferent species encompassing 14 genera and eight families were identified and their records are discussed herein.
The collection is archived in the Marine Invertebrate Collection of the New Zealand National Institute of Water and Atmospheric Research (NIWA). The majority (69%) of specimens are from the Nymphon australe group (Nymphonidae), although species richness and abundance varied among the stations sampled. The collection includes several specimens from polymerous taxa; Pentanymphon antarcticum (Nymphonidae), Decolopoda australis (Colossendeidae) and Pentapycnon bouvieri (Pycnogonidae). All species were classified based on morphological characters, and DNA sequences (from the 18S, 12S, 16S and COI regions) for 21 of the representative morphotypes are given. The DNA sequences confirmed the species-level distinctiveness of these morphotypes.

2004年搭载RS Tangaroa号科考船赴罗斯海开展的TAN0204号生物多样性科考航次，采集获得2687件海蜘蛛（pycnogonids）标本的全新馆藏。本次研究共鉴定出涵盖14个属、8个科的25个有效物种，本文将对这些物种的科考记录展开详细探讨。
该批标本目前馆藏于新西兰国家水与大气研究所（NIWA）的海洋无脊椎动物标本馆。尽管各采样站位的物种丰富度与个体丰度存在显著差异，但其中69%的标本均隶属于海蛛科（Nymphonidae）的南方异吻海蛛（Nymphon australe）类群。本馆藏还包含多份多肢类群标本：南极五爪海蛛（Pentanymphon antarcticum，海蛛科Nymphonidae）、澳洲脱殖海蛛（Decolopoda australis，巨吻海蛛科Colossendeidae）以及布氏五鳍海蛛（Pentapycnon bouvieri，海蛛科Pycnogonidae）。所有物种均基于形态学特征完成分类鉴定，同时本文还提供了21种代表性形态型的18S、12S、16S及COI基因序列数据，这些DNA序列验证了各形态型的物种级区分有效性。