Three new species of the deep-water genus Bathycadulus (Mollusca, Scaphopoda, Gadilidae)

Scarabino, Víctor; Caetano, Carlos Henrique Soares; Carranza, Alvar

doi:10.11646/zootaxa.3096.1.6

Cited by 2 publications

(3 citation statements)

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“…Most of the previous studies integrating morphometry and multivariate statistics in scaphopods focused on comparisons of congeneric species as an additional tool for the descriptions of new species (Shimek & Moreno, 1996; Caetano & Absalão, 2005; Scarabino & Caetano, 2008; Scarabino et al ., 2011). The present study tested not only congeneric comparisons but also other taxonomic categories.…”

Section: Discussionmentioning

confidence: 99%

“…The material examined was selected in an attempt to do a broad taxonomic sampling and based on the availability for study in the collections studied. The shells measured are related to previous taxonomic studies of scaphopods from Brazil (Absalão et al ., 2005; Caetano & Absalão, 2005; Caetano et al ., 2006, 2010; Scarabino & Caetano, 2008; Caetano & Santos, 2010; Scarabino et al ., 2011; Souza & Caetano, 2013), which is reflected in the geographic account of the dataset. The identifications of the specimens were based on the shell morphology with comparisons to the type material, based on original descriptions and illustrations.…”

Section: Methodsmentioning

confidence: 99%

“…The use of this approach applied to the class Scaphopoda has increased since Shimek (1989) proposed the first indices based on measurements of the shell accompanied by statistical evaluation. Recent studies used the same or similar indices as a tool for the discrimination of scaphopod species, focusing on the comparisons of congeneric species of Gadilidae (Absalão et al ., 2005; Caetano & Absalão, 2005; Scarabino & Caetano, 2008; Caetano et al ., 2010; Scarabino et al ., 2011). Groups of Dentaliida have rarely been studied using this combined approach, despite successful results within Fissidentalium P. Fischer, 1885 (Shimek & Moreno, 1996; Shimek, 1997).…”

Section: Introductionmentioning

confidence: 99%

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Morphometry of the shell in Scaphopoda (Mollusca): a tool for the discrimination of taxa

Souza

Caetano

2020

J. Mar. Biol. Ass.

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The alpha taxonomy of scaphopods is based mainly on the shell morphology, as it is for most molluscs. In the last three decades, the employment of morphometric variables of the shell in combination with statistics has considerably increased to aid species discrimination, but this has not been used above species level. In this study, a traditional morphometric approach was used to distinguish congeners, genera and families within the orders Dentallida and Gadilida. We studied 28 species of scaphopods from Brazil, belonging to 12 genera and five families. Twelve morphometric variables were measured, and a correlation test was done to select a set of variables without correlation as input data to perform a discriminant analysis. In the analysis of congeners, the discrimination power was high in both orders. Among the genera studied, the robustness of the analysis was drastically reduced in Dentaliida, while Gadilida maintained a high percentage of correct classifications. At the family level, both orders presented high percentages of correct classification, but the imbalance of cases for each taxon masks an inconsistent result. Based on our results, the morphometric approach was a useful tool to discriminate congeneric species of both orders and to discriminate the genera of Gadilida.

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Section: Discussionmentioning

confidence: 99%