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A molecular phylogeny of Thuridilla Bergh, 1872 sea slugs (Gastropoda, Sacoglossa) reveals a case of flamboyant and cryptic radiation in the marine realm
Martín-Hervás, M.d.R.; Carmona, L.; Malaquias, M.A.E.; Krug, P.J.; Gosliner, T.M.; Cervera, J.L. (2021). A molecular phylogeny of Thuridilla Bergh, 1872 sea slugs (Gastropoda, Sacoglossa) reveals a case of flamboyant and cryptic radiation in the marine realm. Cladistics (Print) 37(6): 647-676. https://dx.doi.org/10.1111/cla.12465
In: Cladistics. Wiley: Westport, CT. ISSN 0748-3007; e-ISSN 1096-0031, meer
Peer reviewed article  
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Trefwoorden
    Thuridilla Bergh, 1872 [WoRMS]
    Marien/Kust
Auteurs  Top 
  • Martín-Hervás, M.d.R.
  • Carmona, L.
  • Malaquias, M.A.E., meer
  • Krug, P.J.
  • Gosliner, T.M.
  • Cervera, J.L.
Abstract
    The genus Thuridilla Bergh, 1872 comprises mostly tropical sap-sucking sea slugs species with flamboyantly coloured forms. However, the potential for cryptic or pseudocryptic species masked by convergent or polymorphic colour patterns has not been tested using molecular characters. In this study, we sampled 20 of the 23 recognized worldwide species and performed the most comprehensive molecular phylogenetic analysis of the genus to date using a multi-locus approach combining two mitochondrial (cytochrome c oxidase subunit I, 16S rRNA) and two nuclear (Histone H3, 28S rRNA) genes using maximum likelihood, maximum-parsimony and Bayesian criteria. Three molecular species delimitation methods (ABGD, GMYC, bPTP) and the morphology of radular teeth were additionally used to aid in species delimitation. Our analyses supported 35 species within Thuridilla, of which more than one-third (13) are part of a single radiation here named the Thuridilla gracilis (Risbec, 1928) species-complex. This complex includes T. gracilis, T. splendens (Baba, 1949), T. bayeri (Er. Marcus, 1965), and T. ratna (Er. Marcus, 1965), plus nine additional undescribed species. All 13 species are distinguishable by radular characters, external morphology and their DNA. The detection of this radiation led diversity of Thuridilla to be underestimated by about 25% and provides a new comparative system for studying the role of colour patterns in marine diversification.
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