New species of Eirenidae (Hydrozoa: Leptothecata) from the Amazonian coast (northern Brazil)

Tosetto, Everton Giachini; Neumann‐Leitão, Sigrid; Júnior, Miodeli Nogueira

doi:10.3989/scimar.05051.14a

Cited by 6 publications

(8 citation statements)

References 15 publications

(15 reference statements)

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“…Both Eutima and Eugymnanthea reproduce by budding within the host's valves, while the dispersal capability of the symbionts is mainly related to the production of a planktonic stage: that is, a medusa in Eutima , and a mature and readily spawning eumedusoid in Eugymnanthea 10,57 (see graphical abstract). Medusae of Eutima have a well‐developed manubrium and tentacles, and they can catch prey 58 . Under rearing conditions, these medusae can survive up to 53 days, and gonads were observed during the first 28 days of life 59 .…”

Section: Resultsmentioning

confidence: 99%

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Guests or pests? Eirenid hydroids living on the soft tissue of bivalves

Camillo

Roveta

Mantas

et al. 2023

Reviews in Aquaculture

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Both wild and reared bivalves can host hydroids from the Eirenidae family which settle on the soft body parts of their host. Thousands of hydroids have been observed on a single bivalve, and often have severe detrimental effects on the host. However, this relationship has received little attention in aquaculture research, which is probably due to a lack of baseline data. An extensive review was conducted (i) to show the current level of knowledge on the association between eirenids and bivalves, providing a benchmark for future research; (ii) to detect a critical combination of biotic/abiotic factors that could switch the relationship from commensalism to infestation and (iii) to identify research priorities for future studies. Seventy scientific papers were screened to provide ecological information useful in understanding the hydroid‐host‐environment interactions and to show the global spatial and bathymetric distribution of the relationship. Although the main parameters influencing the hydroid abundance were identified, it was challenging to collate information from such heterogeneous data sources. A standardized method for data collection is proposed to obtain more robust and comparable data on the association. The most relevant and unstudied issue is the potential physiological and qualitative changes that could occur in infested bivalves. Monitoring the association could provide data needed to prevent or to control hyper‐proliferation of the symbionts and to detect eventual synergistic effects with climate change. This could be fundamental for species living in areas particularly prone to climate regime shifts, such as semi‐enclosed basins and estuarine habitats.

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Section: Resultsmentioning

confidence: 99%

“…Medusae of Eutima have a well-developed manubrium and tentacles, and they can catch prey. 58 Under rearing conditions, these medusae can survive up to 53 days, and gonads were observed during the first 28 days of life. 59 The T A B L E 4 Bivalves' families and species hosting eirenid hydroids.…”

Section: Hydroid Life Cycle Dispersal and Infestation Modalitymentioning

confidence: 99%

Guests or pests? Eirenid hydroids living on the soft tissue of bivalves

Camillo

Roveta

Mantas

et al. 2023

Reviews in Aquaculture

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“…H . angelicae was recently described from the study area [ 68 ], perhaps being an endemic representative of the ARP fauna. M .…”

Section: Discussionmentioning

confidence: 99%

“…In relation to the biodiversity in this system, among several species that were abundant over the continental shelf under influence of the ARP, the hydromedusae P. inclorata, C. octonaria and H. angelicae, and the siphonophores E. hyalinum and M. kochii occurred almost exclusively within this habitat. H. angelicae was recently described from the study area [68], perhaps being an endemic representative of the ARP fauna. M. kochii and C. octonaria are typical coastal water species in the Western Atlantic [5,21,39,69], therefore its absence in the remaining habitats of the study area are expected.…”

Section: Plos Onementioning

confidence: 94%

Amazon River plume habitats shape planktonic cnidarian assemblages in the Western Atlantic

Tosetto,

Neumann-Leitão,

Araujo

et al. 2023

PLoS ONE

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The impact of the Amazon River freshwater plume on planktonic cnidarians over neritic and oceanic provinces is unknown. To provide further knowledge we took advantage of an oceanographic cruise performed in October 2012 in the Western Atlantic off the North Brazilian coast (8°N, 51°W—3.5°S, 37°W). A complex and dynamic system was observed, with strong currents and eddies dispersing the plume over a large area. Our results show that the Amazon River shapes marine habitats with a thin highly productive surface layer compressed by a deeper oxygen minimum zone both over the shelf and in the open ocean. We hypothesized that such habitat structure is particularly advantageous to planktonic cnidarians, which have low metabolic rates, being able to survive in hypoxic zones, resulting in high species richness and abundance. Over the shelf, distinctions were sharp and the area under the influence of the plume presented a diverse assemblage occurring in large abundance, while outside the plume, the hydromedusa Liriope tetraphylla was dominant and occurred almost alone. Divergences in the oceanic province were less pronounced, but still expressive being mostly related to the abundance of dominant species. We concluded that Amazon River plume is a paramount physical feature that profoundly affects the dynamics of the mesoscale habitat structure in the Western Equatorial Atlantic Ocean and that such habitat structure is responsible for shaping planktonic cnidarian assemblages both in neritic and oceanic provinces.

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“…Historically, planktonic cnidarian biodiversity from tropical areas in the western border of the Atlantic Ocean were understudied comparing to subtropical and temperate provinces. With recent progress in oceanographic research in Northeast Brazil this situation started changing not only for cnidarians (e.g., Farias et al, 2020;Tosetto et al, 2018Tosetto et al, , 2020Tosetto et al, , 2021aTosetto et al, , 2021b but also for other marine animals (e.g., Eduardo et al, 2018Eduardo et al, , 2020Alves-Jr. et al, 2019. Thus, the current report contributes not only to the understanding of local biodiversity, but also for an adequate comprehension of regional and global biogeographic and diversity patterns.…”

Section: Dicussionmentioning

confidence: 99%

First record of Cnidocodon leopoldi Bouillon, 1978 (Cnidaria: Anthoathecata) in the Atlantic Ocean

et al. 2021

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Specimens of the hydromedusa Cnidocodon leopoldi Bouillon, 1978 were collected in waters off the northeast Brazilian coast between 7.4°S, 34.3°W and 8.7°S, 34.8°W. The genus can be distinguished from other anthomedusae by the presence of four marginal perradial bulbs having an adaxial nematocyst cushion and branched capitate tentacles, an umbrella with scattered nematocysts, and gonads around a cylindrical manubrium shorter than the umbrella. Specimens were assigned to C. leopoldi due the tentacles with 4-5 branches and the absence of ocelli on tentacle bulbs differing from the congeneric Cnidocodon ocellata Huang, Xu, Lin & Qiu, 2008. This study represents the first record of the species in the Atlantic Ocean.

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New species of Eirenidae (Hydrozoa: Leptothecata) from the Amazonian coast (northern Brazil)

Cited by 6 publications

References 15 publications

Guests or pests? Eirenid hydroids living on the soft tissue of bivalves

Guests or pests? Eirenid hydroids living on the soft tissue of bivalves

Amazon River plume habitats shape planktonic cnidarian assemblages in the Western Atlantic

First record of Cnidocodon leopoldi Bouillon, 1978 (Cnidaria: Anthoathecata) in the Atlantic Ocean

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