Two new species of mud dragons (Scalidophora: Kinorhyncha) inhabiting a human-impacted mangrove from Mayotte (Southwestern Indian Ocean)

Cepeda, Diego; González-Casarrubios, Alberto; Sánchez, Nuria; Spedicato, Adriana; Michaud, Emma; Zeppilli, Daniela

doi:10.1016/j.jcz.2022.09.001

Cited by 8 publications

(7 citation statements)

References 55 publications

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“…This record seems to be of particular interest, since E. blazeji belongs to the E. coulli species group, which so far has been considered as typical shallow-water species. There are 17 species in this group (Randsø et al 2019;Yamasaki et al 2020a;;Cepeda et al 2022;Kennedy et al 2022) and a majority were observed in intertidal marine or brackish water, with the exception of four species that inhabit subtidal, but yet shallow, marine waters (Lundbye et al 2011;Yamasaki 2016;Kennedy et al 2022). Therefore, the occurrence of a representative of the E. coulli-group in deep waters probably suggests that physico-chemical properties of the waters are major driving factors affecting the species distribution of the E. coulli-group rather than bathymetry per se.…”

Section: Discussionmentioning

confidence: 99%

“…nov. even more distinctive and narrow the number of potential congeners down to species belonging to the so-called Echinoderes coulli-group (following the diagnosis of Yamasaki & Fujimoto 2014). Currently, this group accommodates 17 species (Randsø et al 2019;Yamasaki et al 2020a;Cepeda et al 2022;Kennedy et al 2022) that share a number of morphological characters and habitat preferences.…”

Section: Distributionmentioning

confidence: 99%

“…Nevertheless, it should be stressed that these spines are extremely minute and might easily be overlooked due to the dense cuticular hair covering, especially during LM examination. But even if the presence of lateral spines on segment 7 had gone unnoticed among the nine species of the E. coulli group with a middorsal spine on segment 4 (i.e., E. annae Sørensen et al, 2016, E. cyaneafictus Cepeda et al, 2022, E. maxwelli (Omer-Cooper, 1957, E. ohtsukai Yamasaki & Kajihara, 2012, E. parthenope Cepeda et al, 2022, E. regina Yamasaki, 2016, E. rex Lundbye et al, 2011, E. serratulus Yamasaki, 2016and E. teretis Brown, 1999in Adrianov & Malakhov 1999, only E. annae shows the absence of lateral spines (Omer-Cooper 1957;Adrianov & Malakhov 1999;Lundbye et al 2011;Yamasaki & Kajihara 2012;Sørensen et al 2016a;Yamasaki 2016;Cepeda et al 2022). However, other conditions in E. annae make this species easily distinguishable from E. blazeji.…”

Section: Distributionmentioning

confidence: 99%

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Echinoderes (Kinorhyncha: Cyclorhagida) from the Hikurangi Margin, New Zealand

Grzelak

Sørensen²

2022

EJT

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Limited data are available for the kinorhynch fauna from the Southern Hemisphere, with little or no data from New Zealand. Here, we provide a first comprehensive overview of the diversity of mud dragons, with an emphasis on species of Echinoderes from the continental slope of New Zealand, from a variety of habitats such as slopes, canyons and seamounts located in the Hikurangi Margin region. The study revealed fifteen species of Echinoderes. Of these, ten are described as new to science: E. aragorni sp. nov., E. blazeji sp. nov., E. dalzottoi sp. nov., E. frodoi sp. nov., E. galadrielae sp. nov., E. gandalfi sp. nov., E. landersi sp. nov., E. leduci sp. nov., E. legolasi sp. nov. and E. samwisei sp. nov. Moreover, Echinoderes juliae Sørensen et al., 2018, Echinoderes sp. aff. E. balerioni, Echinoderes sp. aff. E. galadrielae/beringiensis, Echinoderes sp. aff. E. lupherorum and Echinoderes sp. aff. E. unispinosus are reported in the investigated region. The most abundant among all was E. gandalfi sp. nov., but it was found only in canyons. Interestingly, the second most common species was E. juliae that was found at several stations in canyons, seamount and on the slope. This species is one of the deep-sea species originally found on the abyssal plain off Oregon and along the continental rise off California, Northeast Pacific, recorded in polymetallic nodules in the tropical eastern Pacific, and recently found on the abyssal plains off Chile, east of the Atacama Trench. These findings, together with records of Echinoderes sp. aff. E. lupherorum and Echinoderes sp. aff. E. unispinosus indicate that, despite their low dispersal abilities, kinorhynchs, similar to other meiofaunal species, may exhibit a wider distribution pattern than previously assumed. The number of recorded species and numerous new species show that New Zealand sediments not only are inhabited by a diverse kinorhynch fauna, but Echinoderes, the most speciose genus, still holds much to discover.

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Section: Discussionmentioning

confidence: 99%

Section: Distributionmentioning

confidence: 99%

Section: Distributionmentioning

confidence: 99%

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Echinoderes (Kinorhyncha: Cyclorhagida) from the Hikurangi Margin, New Zealand

Grzelak

Sørensen²

2022

EJT

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“…This is the case of Kinorhyncha, a commonly neglected phylum in ecological studies of marine meiofauna due to its low abundance (Hodda and Nicholas, 1986;Schrijvers et al, 1995;Bianchelli et al, 2010;Della Patrona et al, 2016). However, some studies showed these animals can become dominant in specific habitats, including some riverine and fringe mangroves (Sarma and Wilsanand, 1994;Gomes et al, 2002;Santos et al, 2009;Ostmann et al, 2012;Annapurna et al, 2015;Cepeda et al, 2022b). In addition, low abundant taxa have shown to be useful when characterizing meiofaunal assemblages in certain areas or when assessing meiofauna sensitivity to pollutants (Vanreusel, 1990;Giere, 2009;Sevastou et al, 2013;Sańchez and Goḿez-Leoń, 2024).…”

Section: Introductionmentioning

confidence: 99%

Environmental drivers modelling the mangrove Kinorhyncha community along an urban-to-natural gradient in French Guiana (western Atlantic Ocean)

Cepeda,

Sánchez,

Spedicato

et al. 2024

Front. Mar. Sci.

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Meiofaunal communities are dominated by free-living nematodes and harpacticoid copepods. Most of the studies defining the environmental drivers that influence meiofauna focus on these profuse groups. The ‘rare’ meiofaunal organisms (densities <5%) are frequently overlooked, making it difficult to know which abiotic variables influence their populations, or their ecological role in the benthic ecosystems. In this study, we explore the ecological factors that characterize a low human-polluted mangrove in French Guiana (western Atlantic Ocean) along an urban-to-natural gradient, focusing on the ‘rare’ phylum Kinorhyncha. This taxon seems to be mainly influenced by sediment size, being more abundant in silty sediments. The presence of microorganisms also enhances the community, likely due to a higher food availability. Oppositely, some trace metals of both lithogenic and anthropogenic origin, as well as predominance of coarser sediment particles, seem to negatively affect their populations. The importance of including the lesser abundant groups of meiofauna in ecological studies is evident, since it allows to have a better idea of the ecological state of marine benthic environments.

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“…Kinorhynchs can be among the top three dominant groups in riverine and fringe mangroves, with values of ca. 39-160 ind/10cm 2 (Gomes et al 2002;Ostmann et al 2012;Annapurna et al 2015;Cepeda et al 2022). Many of the known kinorhynch species inhabiting mangrove habitats belong to the Echinoderes coulli-group, characterized by the possession of an enlarged nephridiopore to cope with strong salinity fluctuations (Cepeda et al 2022).…”

Section: Introductionmentioning

confidence: 99%