When is a “cryptic” species not a cryptic species: A consideration from the Holarctic micro-landsnail genus Euconulus (Gastropoda: Stylommatophora)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F19%3A00107259" target="_blank" >RIV/00216224:14310/19:00107259 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S105579031830215X" target="_blank" >https://www.sciencedirect.com/science/article/pii/S105579031830215X</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ympev.2018.12.004" target="_blank" >10.1016/j.ympev.2018.12.004</a>

Result language

angličtina

Original language name

When is a “cryptic” species not a cryptic species: A consideration from the Holarctic micro-landsnail genus Euconulus (Gastropoda: Stylommatophora)

Original language description

Naive use of molecular data may lead to ambiguous conclusions, especially within the context of “cryptic” species. Here, we integrated molecular and morphometric data to evaluate phylogenetic relationships in the widespread terrestrial micro-snail genus, Euconulus. We analyzed mitochondrial (16S + COII) and nuclear (ITS1 + ITS2) sequence across 94 populations from Europe, Asia and North America within the nominate species E. alderi, E. fulvus and E. polygyratus, and used the southeastern USA E. chersinus, E. dentatus, and E. trochulus as comparative outgroups. Phylogeny was reconstructed using four different reconstruction methods to identify robust, well-supported topological features. We then performed discriminant analysis on shell measurements between these genetically-identified species-level clades. These analyses provided evidence for a biologically valid North American “cryptic” species within E. alderi. However, while highly supported polyphyletic structure was also observed within E. fulvus, disagreement in placement of individuals between mtDNA and nDNA clades, lack of morphological differences, and presence of potential hybrids imply that these lineages do not rise to the threshold as biologically valid cryptic species, and rather appear to simply represent a complex of geographically structured populations within a single species. These results caution that entering into a cryptic species hypothesis should not be undertaken lightly, and should be optimally supported along multiple lines of evidence. Generally, post-hoc analyses of macro-scale features should be conducted to attempt identification of previously ignored diagnostic traits. If such traits cannot be found, i.e. in the case of potentially “fully cryptic” species, additional criteria should be met to propound a cryptic species hypothesis, including the agreement in tree topology among both mtDNA and nDNA, and little (or no) evidence of hybridization based on a critical analysis of sequence chromatograms. Even when the above conditions are satisfied, it only implies that the cryptic species hypothesis is plausible, but should optimally be subjected to further careful examination.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10602 - Biology (theoretical, mathematical, thermal, cryobiology, biological rhythm), Evolutionary biology

Project

<a href="/en/project/GA17-05696S" target="_blank" >GA17-05696S: Holocene development of temperate European biota: effects of climate, refugia and local factors tested by complex datasets of independent proxies</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Molecular Phylogenetics and Evolution

ISSN

1055-7903

e-ISSN

1095-9513

Volume of the periodical

132

Issue of the periodical within the volume

MAR 2019

Country of publishing house

US - UNITED STATES

Number of pages

14

Pages from-to

307-320

UT code for WoS article

000456566000025

EID of the result in the Scopus database

2-s2.0-85059153814