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Cryptic diversity within endemic Italian barbels: revalidation and description of new Barbus species (Teleostei: Cyprinidae).

Abstract：

:Two fluviolacustrine lineages (SI1 Barbus and SI2 Barbus) of the Barbus genus have been recently detected in the Apulia-Campania ichthyogeographic district (southern Italy). The aim of this study was to solve the taxonomic structure of these lineages by comparing them with the two already established Italian fluviolacustrine species B. plebejus and B. tyberinus through a more in depth molecular and morphological investigation. Genetic analyses were performed on both mitochondrial (Cytochrome b) and nuclear (Growth hormone paralog 2) DNA markers, and morphological analyses were carried out on specific age classes and purebred populations. Molecular analyses provided evidence of four evolutionary lineages at mitochondrial level within the Italian fluviolacustrine group, while nuclear dataset highlighted the strict evolutionary relation between B. plebejus sensu stricto and the new lineages, converged in the B. plebejus complex clade. The morphological analyses allowed to discriminate SI1 Barbus and SI2 Barbus from both B. plebejus and B. tyberinus. The new taxa differed for the greatest maximum body height and the longest pre-orbital distance respectively. Both the new lineages have longer ventral and pectoral fins than B. plebejus and B. tyberinus, a larger caudal fin than B. tyberinus and a lower number of scales along the lateral line than B. plebejus. Both molecular and morphological results allowed to consider the two southern Italian endemic lineages as distinct species. The formal description of the new species Barbus samniticus sp. nov. (i.e., SI1 Barbus) and the revalidation of Barbus fucini Costa, 1853 (i.e., SI2 Barbus) were thus proposed and, for both species, molecular and morphological diagnosis were provided. This article is protected by copyright. All rights reserved.

journal_name

J Fish Biol

journal_title

Journal of fish biology

authors

Lorenzoni M,Carosi A,Quadroni S,De Santis V,Vanetti I,Delmastro GB,Zaccara S

doi

10.1111/jfb.14688

subject

Has Abstract

pub_date

2021-01-23 00:00:00

eissn

0022-1112

issn

1095-8649

pub_type

杂志文章

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Cryptic diversity within endemic Italian barbels: revalidation and description of new Barbus species (Teleostei: Cyprinidae).