A new hydrobiid species (Caenogastropoda, Truncatelloidea) from insular Greece

Canella Radea,Paraskevi Niki Lampri,Konstantinos Bakolitsas,Aristeidis Parmakelis

doi:10.3897/zse.97.60254

Abstract

Daphniola dionesp. nov., a valvatiform hydrobiid gastropod from Western Greece, is described based on conchological, anatomical and molecular data. D. dione is distinguished from the other species of the Greek endemic genus Daphniola by a unique combination of shell and soft body character states and by a 7–13% COI sequence divergence when compared to congeneric species. The only population of D. dione inhabits a cave spring on Lefkada Island, Ionian Sea.

Highlights

The Mediterranean Basin numbers among the first 25 Global Biodiversity Hotspots due to its biological and ecological biodiversity and the plethora of threatened biota (Myers et al 2000)
Based on the phylogenetic relationships and the C oxidase subunit I (COI) genetic distances, it can be claimed that D. dione sp. nov. is a well-established and separated genetic lineage and should be considered as different species
The genetic distances (p-distance: 7–13%, HKY: 7–14% Table 2) of D. dione from the other Daphniola species are much higher than those for conspecific populations of Daphniola (p-distance: 1.3–2.7%, Falniowski et al 2007) and are either higher or fall within the range of intra-generic variation estimated for various hydrobiids: Hauffenia Pollonera 1898 (p-distance: 6.7% in Falniowski and Szarowska 2015), Agrafia Szarowska & Falniowski, 2011 (p-distance: 9.5% in Grego et al 2017), Islamia Radoman, 1973 (p-distance: 11.9% in Beran et al 2016) and Pseudamnicola Paulucci, 1878 (p- distance: 2.9–7.7% in Radea et al 2016b)

Summary

Introduction

The Mediterranean Basin numbers among the first 25 Global Biodiversity Hotspots due to its biological and ecological biodiversity and the plethora of threatened biota (Myers et al 2000). The region from the Iberian Peninsula to the Balkans is characterized by the high diversity and endemicity of freshwater flora and fauna (Cuttelod et al 2008; De Figueroa et al 2013; Smith et al 2014) and the biota of Greek freshwater ecosystems are widely recognized as a major component of this diversity (Glöer and Maassen 2009; Glöer et al 2010). The family Hydrobiidae (hydrobiids) is one of the largest and the most diverse gastropod family throughout the Mediterranean region (Cuttelod et al 2008). The species of this group are highly endemic and phylogenetically not related (Radea 2018). More than 60% of these genera inhabit the freshwater systems of the Balkan Peninsula (Radea 2018; Boeters et al 2019; Delicado et al 2019)

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Conclusion