Shallow and deep-sea chitons of the genus Leptochiton Gray, 1847 (Mollusca: Polyplacophora: Lepidopleurida) from Peruvian and Chilean waters
Shallow and deep-sea chitons of the genus Leptochiton Gray, 1847 (Mollusca: Polyplacophora: Lepidopleurida) from Peruvian and Chilean waters
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DOI：
10.11646/zootaxa.4033.2.1
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发表时间：
2015-10-22
期刊：
影响因子：
0.9
通讯作者：
Sirenko, Boris
中科院分区：
文献类型：
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作者：
Sirenko, Boris
智利和秘鲁的东南部海域产出了非常丰富多样的薄石鳖属基石鳖动物群。本文是根据对1055个石鳖标本的研究而作的。本文报道了细石鳖科13种，其中7种为新种，分别为Leptochitonlascrusesi n. sp.，L.亚麻; sp.，L.长鳃; sp.，L.秘鲁;秘鲁人; sp.，L.麦克莱尼; sp.，L.西印度群岛; sp.，和L.杂种;在陆架上发现了5种，但其中只有1种是本区特有种。其他八个物种生活在半深海或深海深处。因此，13个物种中有12个被发现超过200米。细石鳖属起源于晚古生代的浅水沃茨。它可能转移到深水，因为更先进的石鳖属的竞争。秘鲁智利海沟的细石鳖动物群非常丰富。从这个沟系统中研究了五种。其中两个L。长鳃; sp.和L.秘鲁;秘鲁人; sp.，其特征是鳃的数量异常多，因此在外套腔中的分布范围更广，向前延伸到瓣膜V和III。这种形态特征在鳞皮目中是不寻常的，类似于在石鳖目中发现的条件。
The Southeast region off Chile and Peru has yielded a very rich diverse fauna of basal chitons of the genus Leptochiton. The present contribution is based on the study of 1055 specimens of chitons. Thirteen leptochitonid species are reported of which seven species are new, namely Leptochiton lascrusesi n. sp., L. linseae n. sp., L. longibranchiae n. sp., L. peruvianus n. sp., L. macleani n. sp., L. sigwartae n. sp., and L. mutschkeae n. sp. Five species were found on the shelf, but only one of those is limited to this zone. The other eight species live in bathyal or abyssal depths. Thus, 12 of 13 species were found deeper than 200 m. The genus Leptochiton originated in the late Palaeozoic in shallow waters. It probably shifted to deep-waters because of competition by more advanced genera of chitons. The leptochitonid fauna of the PeruChile Trench turned out to be rich. Five species were studied from this trench system. Two of them-L. longibranchiae n. sp. and L. peruvianus n. sp.-are characterized by an unusually high number of gills and an accordingly wider distribution in the mantle cavity, reaching in an anterior direction to valves V and III. This morphological peculiarity is unusual for Lepidopleurida and resembles the conditions found in the order Chitonida.