The nassariids from the Gulf of Gabès revisited (Neogastropoda, Nassariidae)

Aissaoui, Chrifa; Galindo, Luis Javier; Puillandre, Nicolas; Bouchet, Philippe

doi:10.1080/17451000.2016.1273528

Cited by 6 publications

(15 citation statements)

References 17 publications

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“…Indeed, the validity of many taxa described or recorded from the Mediterranean Sea over centuries has yet to be confirmed by molecular means or by barcoding of material [21]. The study of selected phylogenetic clades, through integrative approaches, has already brought to unexpected results, including the discovery or description of several new species even within widely studied groups [24, 27–29, 121–122]. At the same time, our result also confuted the possible occurrence of O .…”

Section: Discussionmentioning

confidence: 99%

What is really out there? Review of the genus Okenia Menke, 1830 (Nudibranchia: Goniodorididae) in the Mediterranean Sea with description of two new species

et al. 2019

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The precise number of Okenia taxa inhabiting the Mediterranean Sea, as well as their general taxonomy, varies according to different specialists. So far, eight valid species have been reported from the area: Okenia aspersa (Alder & Hancock, 1845), Okenia cupella (Vogel & Schultz, 1970), Okenia elegans (Leuckart, 1828), Okenia hispanica Valdés & Ortea, 1995, Okenia impexa Er. Marcus, 1957, Okenia leachii (Alder & Hancock, 1854), Okenia mediterranea (Ihering, 1886), and Okenia zoobotryon (Smallwood, 1910). Of these, only three ( O . elegans , O . hispanica , and O . mediterranea ) have their type localities in the Mediterranean Sea, whereas the others were described from different biogeographic areas and later included in the Mediterranean biota. We carried out a review on Mediterranean Okenia species through an integrative approach, based on a wide literature search and a morphological and molecular analysis of available type material and samples collected recently. The present study confirmed the presence of O . aspersa , O . elegans , O . hispanica , and O . mediterranea in the Mediterranean Sea, although leaving remaining questions about some of those taxa. The distribution of O . cupella , O . impexa , and O . zoobotryon is limited to the western Atlantic, and of O . leachii to the eastern Atlantic. All specimens previously identified as O . cupella , O . impexa , and O . zoobotryon by different authors in the Mediterranean Sea were repeatedly misidentified. Thus, we describe Okenia problematica sp. nov. and Okenia longiductis sp. nov., from the “Mediterranean” Okenia cupella/impexa and O . zoobotryon . We also consider here Okenia pusilla Sordi, 1974 a nomen dubium and include a redescription of the holotype of O . cupella . A molecular phylogeny, including all the sequenced Okenia species, was performed in order to evaluate the evolutionary relationships of the newly described species with the other congeneric taxa.

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Section: Discussionmentioning

confidence: 99%

What is really out there? Review of the genus Okenia Menke, 1830 (Nudibranchia: Goniodorididae) in the Mediterranean Sea with description of two new species

et al. 2019

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“…The type of larval shell or protoconch with a single (paucispiral) or multiple whorls (multispiral) was accessed based on literature (Galindo et al, 2016;Aissaoui, Galindo, Puillandre, & Bouchet, 2017) except for T. vaucheri, which was determined by direct examination of the shells (the number of whorls was counted to the nearest quarter whorl; Modica et al, 2020). Both types of protoconch were used as a proxy of the lecithotrophic (direct development using yolk reserves) or planktotrophic (with a feeding veliger phase) modes of larval development (Strathmann, 1978).…”

Section: Ancestral Character State Reconstructionmentioning

confidence: 99%

“…The last lineage of Clade I included three species corresponding to the "T. cuvierii complex" plus T. reticulata and T. nitida (Galindo et al, 2016;Aissaoui, Galindo, Puillandre, & Bouchet, 2017). Within the "T. cuvierii complex", T. cuvierii and T. unifasciata are sympatric along the Mediterranean coasts, and differ in the size of their shell, protoconch and egg capsules (Moreno & Templado, 1994).…”

Section: Taxonomy Of Tritiamentioning

confidence: 99%

Mitogenomic phylogeny of mud snails of the mostly Atlantic/Mediterranean genusTritia(Gastropoda: Nassariidae)

et al. 2021

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The mud snails endemic to the East Atlantic/Mediterranean region (genus Tritia; subfamily Nassariinae) account for the second highest diversity within the family Nassariidae (Gastropoda: Buccinoidea). In order to understand how the diversity of species, shell morphologies, and ecological traits evolved within this genus, a robust phylogenetic framework is needed, yet still unavailable due to high levels of homoplasy in shell morphology, the main trait used for their taxonomic classification. Here, the near-complete mitogenomes of 20 species representing more than half of the diversity of Tritia were sequenced. All mitogenomes of Tritia shared the same gene order, which is identical to the consensus reported for caenogastropods. The reconstructed phylogeny indicates that all analyzed Tritia species formed a natural group except Tritia vaucheri, which was sister to an early diverging clade within subfamily Nassariinae that includes species of genus Reticunassa sister to Nassarius jacksonianus and Nassarius sp. Within Tritia, the Northwest Atlantic species Tritia obsoleta was placed as the sister group of three mostly East Atlantic/Mediterranean clades (I-III), prompting the reinstatement of the genus Ilyanassa. The latter three clades corresponded to different shell features (I, shell mostly with marked sculpture; II, shell with strong nodules and small size; and III, smooth shell). For Tritia incrassata, the analyzed specimens from Norway and from the Spanish Mediterranean coasts showed notable genetic divergence, which may indicate the existence of cryptic species. The ancestral character state reconstruction of protoconch inferred that the ancestor of Tritia had planktotrophic larvae, and that a transition to lecithotrophy occurred independently at least three times within Nassariinae. The reconstructed chronogram dated the origin of Tritia in the Oligocene and main diversification events during the Miocene to Pleistocene, correlated with drastic shifts in local paleoecosystems caused by cooling events, eustatic sea level changes, and the Messinian Salinity Crisis that favored temperate taxa.

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“…The mitochondrial sequences, however, belong to the Black Sea haplogroup. Similarly, Simon-Bouhet 54 , based on mito-nuclear discordance raised the possibility of the introduced nature of a population at Mar Menor (Western Mediterranean Sea) and Aissaoui et al 49 documented a recent introduction event in the Gulf of Gabès (Tunisia), both populations are located in the native area. Likewise, the mixed genetic make-up of our sample from Sile, might be due to recent introductions of Mediterranean specimens into the Black Sea.…”

Section: Discussionmentioning

confidence: 98%

“…While microsatellite markers were developed 48 , they have never been used to further our collective understanding of the population genetic structure of T. neritea . To add further complexity to such an intricate distribution, some populations are thought to represent recent introduction events within the ‘native’ range, such is likely the case for the Gulf of Gabès 49 . Consequently, it may prove very challenging to track unequivocally clear dispersal pathways (natural and/or artificial) for this species, and a better understanding of the population structure in the native area is critical.…”

Section: Introductionmentioning

confidence: 99%

Chaotic genetic structure and past demographic expansion of the invasive gastropod Tritia neritea in its native range, the Mediterranean Sea

Boissin

Neglia

Baksay

et al. 2020

Sci Rep

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To better predict population evolution of invasive species in introduced areas it is critical to identify and understand the mechanisms driving genetic diversity and structure in their native range. Here, we combined analyses of the mitochondrial COI gene and 11 microsatellite markers to investigate both past demographic history and contemporaneous genetic structure in the native area of the gastropod Tritia neritea, using Bayesian skyline plots (BSP), multivariate analyses and Bayesian clustering. The BSP framework revealed population expansions, dated after the last glacial maximum. The haplotype network revealed a strong geographic clustering. Multivariate analyses and Bayesian clustering highlighted the strong genetic structure at all scales, between the Black Sea and the Adriatic Sea, but also within basins. Within basins, a random pattern of genetic patchiness was observed, suggesting a superimposition of processes involving natural biological effects (no larval phase and thus limited larval dispersal) and putative anthropogenic transport of specimens. Contrary to the introduced area, no isolation-by-distance patterns were recovered in the Mediterranean or the Black Seas, highlighting different mechanisms at play on both native and introduced areas, triggering unknown consequences for species’ evolutionary trajectories. These results of Tritia neritea populations on its native range highlight a mixture of ancient and recent processes, with the effects of paleoclimates and life history traits likely tangled with the effects of human-mediated dispersal.

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The nassariids from the Gulf of Gabès revisited (Neogastropoda, Nassariidae)

Cited by 6 publications

References 17 publications

What is really out there? Review of the genus Okenia Menke, 1830 (Nudibranchia: Goniodorididae) in the Mediterranean Sea with description of two new species

What is really out there? Review of the genus Okenia Menke, 1830 (Nudibranchia: Goniodorididae) in the Mediterranean Sea with description of two new species

Mitogenomic phylogeny of mud snails of the mostly Atlantic/Mediterranean genusTritia(Gastropoda: Nassariidae)

Chaotic genetic structure and past demographic expansion of the invasive gastropod Tritia neritea in its native range, the Mediterranean Sea

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