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Larval and early post-larval shell of three deep-sea Scaphopoda (Mollusca) from the southwest Atlantic
Molluscan Research ( IF 1 ) Pub Date : 2018-09-09 , DOI: 10.1080/13235818.2018.1513896
Priscila Magalhães Silva Vilela 1 , Leonardo Santos de Souza 2 , Carlos Henrique Soares Caetano 1
Affiliation  

The larval shells of Antalis circumcincta (Watson, 1879) (order Dentaliida), Pertusiconcha callithrix (Dall, 1889) (order Gadilida) and of an undetermined species of uncertain systematic position are described. The material studied comprises mainly samples from deep waters, collected by expeditions along the southeast coast of Brazil. The larval shell of the three taxa matches other types previously described in the literature. Antalis circumcincta and P. callithrix have four regions (protoconch A, protoconch B, teleoconch A, teleoconch B), but differ in dimensions and sculpture from each other, while the undetermined species has three regions (protoconch A, protoconch B, teleoconch B). A morphometric approach combined with a discriminant analysis also indicates that the three taxa are significantly distinct. This study confirms patterns of larval shells at the taxonomic rank of orders but other supraspecific patterns remain uncertain.



中文翻译:

来自西南大西洋的三个深海Scaphopoda(Mollusca)的幼虫和幼虫后早期壳

描述了圆角蚁(幼虫,Watson,1879年)(Dentaliida),Pertusiconcha callithrix(Dall,1889年,Gadilida),以及不确定系统位置的未定种的幼虫。研究的材料主要包括来自深水的样品,这些样品是沿着巴西东南沿海的探险队收集的。这三个分类单元的幼虫壳与先前文献中描述的其他类型相匹配。圆柏Callithrix共有四个区域(原始贝壳A,原始贝壳B,远距贝壳A,远距贝壳B),但在尺寸和雕刻方面彼此不同,而未确定物种具有三个区域(原始贝壳A,原生贝壳B,远距贝壳B)。形态分析方法与判别分析相结合还表明,这三个类群明显不同。这项研究证实了幼虫壳的模式在生物分类等级上,但是其他超特异模式仍然不确定。

更新日期:2018-09-09
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