Expect the unexpected: a new large species of Marionia (Heterobranchia : Nudibranchia : Tritoniidae) from western Europe
Bruno Almón A B D , Jacinto Pérez A and Manuel Caballer C
+ Author Affiliations
- Author Affiliations
A Grupo de Estudo do Medio Mariño (GEMM), Puerto Deportivo s/n, 15960 Ribeira, A Coruña, Spain.
B Instituto Español de Oceanografía, Centro Oceanográfico de Vigo, Subida a Radio Faro, 50-52, 36390 Vigo, Spain.
C Muséum National d’Histoire Naturelle, Direction des Collections, 55 rue de Buffon, 75005 Paris, France.
D Corresponding author. Email: brunoalmon2@yahoo.es
Invertebrate Systematics 32(4) 892-908 https://doi.org/10.1071/IS17073
Submitted: 22 February 2017 Accepted: 19 April 2018 Published: 16 August 2018
Abstract
The target species of this work is a large tritonid nudibranch, relatively common in Galician waters (north-western Spain), where it has been regularly observed since the year 2000. To date, this species has been misidentified as Tritonia hombergii, a species from northern latitudes, because of its remarkable size. On the other hand, the external anatomy of the specimens from north-western Spain resembles that of Marionia blainvillea, a species common in the Mediterranean. To untangle the real taxonomic identity of the species, a detailed anatomical study was performed, revealing several morphological differences that has led us to consider the Galician specimen as new to science. A phylogenetic analysis was conducted for both 16S and COI genes to try to establish its systematic position in relation with other taxa. Marionia gemmii, sp. nov. differs from all known Tritoniidae in the size, colour pattern, number of velar processes, presence of stomach plates, radular formula, the shape of spawning masses and even in its feeding habits. The phylogenetic results support the comprehensive morphological analysis and also make it clear that most tritoniid genera currently recognised are not monophyletic and that a major systematic revision of the family is needed.
http://zoobank.org/urn:lsid:zoobank.org:pub:91332872-9020-4D06-8B1C-2E7654D54E1A
Additional keywords: Atlantic, cryptic species, northern Spain.
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