Description of a New Species from the Brazilian Province: Dalliconus edpetuchi

Monnier, Eric; Limpalaër, Loïc; Roux, Christophe; Berschauer, David

doi:10.54173/f47151

Cited by 4 publications

(8 citation statements)

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“…The deepand shallow-water clades of C. imperialis are more genetically distant from each other than they are from C. imperialis cf. fuscatus, which many researchers consider to be the distinct species, Conus (or Rhombiconus) fuscatus (34). Deep-and shallow-water C. imperialis also occupy the same geographical range across the oceans, yet retain their genetic distinctiveness.…”

Section: Discussionmentioning

confidence: 99%

Small-molecule mimicry hunting strategy in the imperial cone snail, Conus imperialis

et al. 2021

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Venomous animals hunt using bioactive peptides, but relatively little is known about venom small molecules and the resulting complex hunting behaviors. Here, we explored the specialized metabolites from the venom of the worm-hunting cone snail, Conus imperialis. Using the model polychaete worm Platynereis dumerilii, we demonstrate that C. imperialis venom contains small molecules that mimic natural polychaete mating pheromones, evoking the mating phenotype in worms. The specialized metabolites from different cone snails are species-specific and structurally diverse, suggesting that the cones may adopt many different prey-hunting strategies enabled by small molecules. Predators sometimes attract prey using the prey’s own pheromones, in a strategy known as aggressive mimicry. Instead, C. imperialis uses metabolically stable mimics of those pheromones, indicating that, in biological mimicry, even the molecules themselves may be disguised, providing a twist on fake news in chemical ecology.

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Section: Discussionmentioning

confidence: 99%

Small-molecule mimicry hunting strategy in the imperial cone snail, Conus imperialis

et al. 2021

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“…On the basis of shell pattern, shell size, shell colour, and syphon and foot patterns, both sub-groups closely resembled C. flavidus , except sub-group 1 had a round shaped crown and sub-group 2 had a flat crown, while C. flavidus crown shape had an intermediate shape ( Table 2 ). These sub-groups did not match the morphological descriptions (lip colour/pattern, the shell colour/pattern, shell shape, syphon colour) of other phylogenetically and morphologically related Virgiconus species commonly found in the Indo-Pacific region, including C. virgo, C. ermineus, and C. coelinae [ 35 ]. While the morphological features of sub-group 2 resembled the newly described C. paesei from Hawaii [ 16 , 35 ], more detailed morphological and molecular studies are required before the sub-groups from One Tree Island Reef can be more completely identified.…”

Section: Resultsmentioning

confidence: 99%

“…These sub-groups did not match the morphological descriptions (lip colour/pattern, the shell colour/pattern, shell shape, syphon colour) of other phylogenetically and morphologically related Virgiconus species commonly found in the Indo-Pacific region, including C. virgo, C. ermineus, and C. coelinae [ 35 ]. While the morphological features of sub-group 2 resembled the newly described C. paesei from Hawaii [ 16 , 35 ], more detailed morphological and molecular studies are required before the sub-groups from One Tree Island Reef can be more completely identified.…”

Section: Resultsmentioning

confidence: 99%

“…It is hypothesised that cone snails first evolved as worm hunters and later repurposed their defensive venoms for fish and mollusc hunting [ 6 , 36 , 37 ]. These adaptations allowed exploitation of new ecological niches [ 6 , 33 , 38 , 39 ], giving rise to over 800 species classified into 80 clades over ≈30 my (sub-genus) [ 35 ]. This rapid expansion of species continues, giving rise to cryptic species with little or no obvious morphological differentiation [ 5 , 15 , 16 , 19 ].…”

Section: Discussionmentioning

confidence: 99%

“…C. flavidus and C. frigidus (20 specimens each) were collected from the second and third lagoons of the One Tree Island Reef, Queensland ( Figure S12 ). Species identification was performed according to the identification key explained previously [ 35 ]. Two cryptic sub-groups closely resembling C. flavidus were also identified and separated from C. flavidus on the basis of the crown shape and named sub-group 1 and 2 prior to formal identification.…”

Section: Methodsmentioning

confidence: 99%

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Comparative Venomics of C. flavidus and C. frigidus and Closely Related Vermivorous Cone Snails

et al. 2022

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Cone snail venom biodiversity reflects dietary preference and predatory and defensive envenomation strategies across the ≈900 species of Conidae. To better understand the mechanisms of adaptive radiations in closely related species, we investigated the venom of two phylogenetically and spatially related species, C. flavidus and C. frigidus of the Virgiconus clade. Transcriptomic analysis revealed that the major superfamily profiles were conserved between the two species, including 68 shared conotoxin transcripts. These shared transcripts contributed 90% of the conotoxin expression in C. frigidus and only 49% in C. flavidus, which showed greater toxin diversification in the dominant O1, I2, A, O2, O3, and M superfamilies compared to C. frigidus. On the basis of morphology, two additional sub-groups closely resembling C. flavidus were also identified from One Tree Island Reef. Despite the morphological resemblance, the venom duct proteomes of these cryptic sub-groups were distinct from C. flavidus. We suggest rapid conotoxin sequence divergence may have facilitated adaptive radiation and the establishment of new species and the regulatory mechanisms facilitating species-specific venom evolution.

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Coordinated adaptations define the ontogenetic shift from worm- to fish-hunting in a venomous cone snail

2023

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Marine cone snails have attracted researchers from all disciplines but early life stages have received limited attention due to difficulties accessing or rearing juvenile specimens. Here, we document the culture of Conus magus from eggs through metamorphosis to reveal dramatic shifts in predatory feeding behaviour between post-metamorphic juveniles and adult specimens. Adult C. magus capture fish using a set of paralytic venom peptides combined with a hooked radular tooth used to tether envenomed fish. In contrast, early juveniles feed exclusively on polychaete worms using a unique “sting-and-stalk” foraging behaviour facilitated by short, unbarbed radular teeth and a distinct venom repertoire that induces hypoactivity in prey. Our results demonstrate how coordinated morphological, behavioural and molecular changes facilitate the shift from worm- to fish-hunting in C. magus, and showcase juvenile cone snails as a rich and unexplored source of novel venom peptides for ecological, evolutionary and biodiscovery studies.

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Description of a New Species from the Brazilian Province: Dalliconus edpetuchi

Cited by 4 publications

References 0 publications

Small-molecule mimicry hunting strategy in the imperial cone snail, Conus imperialis

Small-molecule mimicry hunting strategy in the imperial cone snail, Conus imperialis

Comparative Venomics of C. flavidus and C. frigidus and Closely Related Vermivorous Cone Snails

Coordinated adaptations define the ontogenetic shift from worm- to fish-hunting in a venomous cone snail

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