A new species of Ligiarctus (Tardigrada, Arthrotardigrada) from the Brazilian continental shelf, Southwestern Atlantic Ocean

Gomes-Júnior, Edivaldo; Santos, Érika; Rocha, Clélia Márcia Cavalcanti da; Santos, Paulo Jorge Parreira dos; Fontoura, Paulo

doi:10.1007/s12526-017-0709-0

Cited by 9 publications

(5 citation statements)

References 8 publications

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“…Their presence in other florarctins is yet to be demonstrated. In common with many florarctin tardigrades, including Ligiarctus (Gomes-Júnior et al 2018), there are only two lateral vesicles with symbiotic bacteria (vc, Fig. 3) in Florarctus bellahelenae sp.…”

Section: Anatomymentioning

confidence: 99%

“…Pacific florarctins (Halechiniscidae) have been the subject of systematic faunistic studies (Delamare-Deboutteville and Renaud-Mornant 1965;Renaud-Mornant 1967, 1989Kristensen 1984;Noda 1987;Chang and Rho 1997;Jørgensen et al 2014;Bartels et al 2015;Fujimoto 2015). This subfamily is particularly interesting due to the presence of epicuticular vesicles with endosymbiotic bacteria (Kristensen 1984), and a broad spectrum of sexual dimorphism, as sex-collection, is the goal of the present paper in Ligiarctus Renaud- Mornant, 1982(Gomes-Júnior et al 2018 and Wingstrandarctus Kristensen, 1984(Kristensen 1984 but well marked in Florarctus Delamare- Deboutteville & Renaud-Mornant, 1965(Renaud-Mornant 1989. Sexspecific differences have been described in recent papers about Florarctus from the Ionian Sea and the Caribbean (Hansen et al 2016;Anguas-Escalante et al 2020).…”

Section: Introductionmentioning

confidence: 99%

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Extreme secondary sexual dimorphism in the genus Florarctus (Heterotardigrada: Halechiniscidae)

Gąsiorek

Kristensen

2021

Mar. Biodivers.

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Secondary sexual dimorphism in florarctin tardigrades is a well-known phenomenon. Males are usually smaller than females, and primary clavae are relatively longer in the former. A new species Florarctus bellahelenae, collected from subtidal coralline sand just behind the reef fringe of Long Island, Chesterfield Reefs (Pacific Ocean), exhibits extreme secondary dimorphism. Males have developed primary clavae that are much thicker and three times longer than those present in females. Furthermore, the male primary clavae have an accordion-like outer structure, whereas primary clavae are smooth in females. Other species of Florarctus Delamare-Deboutteville & Renaud-Mornant, 1965 inhabiting the Pacific Ocean were investigated. Males are typically smaller than females, but males of Florarctus heimi Delamare-Deboutteville & Renaud-Mornant, 1965 and females of Florarctus cervinus Renaud-Mornant, 1987 have never been recorded. The Renaud-Mornant collection was re-examined, and type series were analysed. Florarctus heimi and F. cervinus were always found together in the coralline sand of Heron Island (Great Barrier Reef). The animals were kept alive and surveyed in the laboratory of the Queensland Museum. All studied individuals of the larger F. heimi (up to ca. 400 μm) were females, and all adults of the smaller F. cervinus (about 170 μm) were males. Males of F. cervinus were observed mating with females of F. heimi. Following those morphological and behavioural lines of evidence, we propose that F. cervinus is a junior synonym of F. heimi. Based on the discovery of dimorphism in F. bellahelenae sp. nov. and the strong sex-related morphological disparities in F. heimi, we suggest that extreme secondary dimorphism may be present in other florarctin arthrotardigrades.

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Section: Anatomymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Extreme secondary sexual dimorphism in the genus Florarctus (Heterotardigrada: Halechiniscidae)

Gąsiorek

Kristensen

2021

Mar. Biodivers.

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“…The biologist Clélia Márcia Cavalcanti da Rocha maintains a research group on the systematics and ecology of tardigrades, working mainly with marine tardigrades of the northeastern coast of Brazil (Rocha, 2018). Recently, her group described the new species Ligiarctus alatus Gomes Júnior, Santos, da Rocha, Santos & Fontoura, 2018 (Santos et al, 2017). Rocha also organized the first tardigrades scientific collection in Brazil (Rocha, 2018).…”

Section: On Tardigrades Research In Brazilmentioning

confidence: 99%

Tardigrades Research in Brazil: an overview and updated checklist

Barros¹

2020

Arq. Zool.

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Tardigrades are microscopic animals, commonly referred to as “water bears”, and comprise the phylum Tardigrada. They are found in diverse habitats in terrestrial, freshwater and marine environments worldwide. In this paper, it is presented a brief history of the study of tardigrades in Brazil and an updated species checklist of Brazilian tardigrades. Since the first report in 1913, the number of tardigrades records has increased, reflecting advances in the understanding the diversity of tardigrades in Brazil. A total of 100 species known from Brazil are listed, being 30 in marine and 70 in terrestrial and freshwater environments. The records are concentrated in Southeast (47.1%) and Northeast (41.3%) regions. Despite the advances, further research and sampling of new areas is still needed, besides reanalysis and confirmation of old records. Brazil, with its vast territory, extensive continental shelf and great diversity of biomes, has great potential to expand our knowledge of tardigrades fauna.

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“…Furthermore, Ligiarctus alatus Gomes-Júnior, E. Santos, da Rocha, P.J.P. Santos & Fontoura, 2018 is transferred to the new genus as Higginsarctus alatus gen. et comb. nov. and the diagnosis of the genus Ligiarctus is amended.…”

Section: Introductionmentioning

confidence: 99%

A new genus and five new species of the subfamily Florarctinae (Tardigrada, Arthrotardigrada)

Hansen

Kristensen

2021

EJT

939

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A new genus Higginsarctus gen. nov. in the subfamily Florarctinae Renaud-Mornant, 1982 (Arthrotardigrada) is established on the basis of the type species H. signeae gen. et sp. nov. described from carbonated sand habitats from Faroe Bank, North Atlantic Ocean. Three other Atlantic species H. laurae gen. et sp. nov., H. martini gen. et sp. nov. and H. shintai gen. et sp. nov. are described from Dentalium sand, Roscoff, France and finally H. lassei gen. et sp. nov. is described from the deep sea in the South Pacific Ocean off the coast of Chile. The recently described species Ligiarctus alatus Gomes-Júnior, E. Santos, da Rocha, P.J.P. Santos & Fontoura, 2018 is investigated and compared with the type species Ligiarctus eastwardi Renaud-Mornant, 1982. New and additional information to the original description of L. alatus is provided and this species is moved to Higginsarctus gen. nov. as H. alatus comb. nov.

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A new species of Ligiarctus (Tardigrada, Arthrotardigrada) from the Brazilian continental shelf, Southwestern Atlantic Ocean

Cited by 9 publications

References 8 publications

Extreme secondary sexual dimorphism in the genus Florarctus (Heterotardigrada: Halechiniscidae)

Extreme secondary sexual dimorphism in the genus Florarctus (Heterotardigrada: Halechiniscidae)

Tardigrades Research in Brazil: an overview and updated checklist

A new genus and five new species of the subfamily Florarctinae (Tardigrada, Arthrotardigrada)

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