The diversity of Indian Ocean Heterotardigrada

Gallo, M. D'Addabbo; D’Addabbo, R.; Leonardis, C. De; Sandulli, Roberto; Grimaldi, Susanna De Zio

doi:10.4081/jlimnol.2007.s1.60

Cited by 18 publications

(14 citation statements)

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“…In spite of the great interest in this archipelago, the information available about its meiofauna is mostly taxonomic (Gerlach 1961, 1962, 1963a,b, 1964; De Zio Grimaldi et al. 1999; Gallo et al. 2007).…”

Section: Problemmentioning

confidence: 99%

“…The Maldive Islands form the central part of the Chagos-Maldives-Laccadive ridge in the Central Indian Ocean and comprise some of the most characteristic and signifi-cant atoll systems (Risk & Sluka 2000); their back-reef platforms consist entirely of carbonate sediments, unlike those of the Pacific Atolls. In spite of the great interest in this archipelago, the information available about its meiofauna is mostly taxonomic (Gerlach 1961(Gerlach , 1962(Gerlach , 1963a(Gerlach ,b, 1964De Zio Grimaldi et al 1999;Gallo et al 2007). For these reasons, a study of the meiofaunal and nematode assemblages from three Maldivian back-reef sandy platforms was conducted.…”

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confidence: 99%

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The distribution of meiofauna on back-reef sandy platforms in the Maldives (Indian Ocean)

et al. 2010

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The Maldivian archipelago comprises some of the most characteristic and significant world atoll systems, but the meiobenthic assemblages of these islands continue to be largely unknown. To investigate variations in meiofaunal spatial distribution and biodiversity in back‐reef platforms, three transects were studied, two at Felidhoo (the north and east sides) and one at South Malé. The sedimentological features of the samples obtained were also analyzed to further current knowledge on the relationships that exist between sediments and meiofauna. Our results reveal that the meiofaunal assemblage at these locations is well diversified and includes 20 major taxa. Nematodes and copepods are dominant, together forming 68% of the total meiofauna, followed by platyhelminthes, polychaetes and ostracods. The nematode assemblage is very rich and composed of 34 families and 123 genera – 96 of which (78%) set new records for the Maldives. The structures of the meiofaunal and nematode assemblages are relatively similar on the ‘large‐scale’ level (i.e. when the different platforms are compared) and reveal a low β‐diversity. However, significant dissimilarities were detected within each platform, emphasizing that such ‘small‐scale’ differences are the main factors determining the structure of the meiofauna and, in particular, the nematode assemblages. Although significant differences were not detected between the transects, greater levels of dissimilarity were recognized at North Felidhoo. Here, the building of inclined deposit layers plays a significant role in increasing the heterogeneity of the platform habitats and sediments, confirming the great importance of sediment granulometry as an environmental variable. Indeed, a close relationship is observed between meiofauna (especially for the nematodes) and grain size, which appears to control the structure, diversity and trophic composition of the Maldivian meiofauna assemblages, thus highlighting the high biodiversity existing in the medium‐coarse sands.

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Section: Problemmentioning

confidence: 99%

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The distribution of meiofauna on back-reef sandy platforms in the Maldives (Indian Ocean)

et al. 2010

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“…Similar numbers of species and percentages of new species were found by Gallo et al . () in previously unsampled intertidal sand from the Seychelles. In the same study, the authors found a richer assemblage of marine tardigrades in the subtidal sediments of the Maldives (25 species) but, with a lower percentage of new species (Gallo et al ., ).…”

Section: Discussionmentioning

confidence: 99%

“…() in previously unsampled intertidal sand from the Seychelles. In the same study, the authors found a richer assemblage of marine tardigrades in the subtidal sediments of the Maldives (25 species) but, with a lower percentage of new species (Gallo et al ., ). An investigation of intertidal and shallow subtidal marine tardigrades in Sardinia by D'Addabbo et al .…”

Section: Discussionmentioning

confidence: 99%

Biodiversity of marine tardigrades from the northern coast of Portugal (Iberian Peninsula)

et al. 2016

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Information about marine tardigrades in the Iberian Peninsula is very scarce. To improve our knowledge of this group, a sampling programme was started in 2010. The main coastal marine habitats of northern Portugal were explored. Eighteen species were found. Four species are new to science (the previously described Prostygarctus aculeatus Rubal, Veiga, Fontoura & Sousa-Pinto, 2013 and three species of the genus Batillipes), and another four species of the genera Batillipes, Echiniscoides, Halechiniscus and Wingstrandarctus are potentially new species. Moreover, six species (Stygarctus bradypus Schulz, 1951; Halechiniscus greveni Renaud-Mornant & Deroux, 1976; Styraconyx haploceros Thulin, 1942; Styraconyx sardiniae D'Addabbo Gallo, Morone De Lucia & de Zio Grimaldi, 1989; Anisonyches diakidius Pollock, 1975; and Batillipes tubernatis Pollock, 1971) were recorded in the Iberian Peninsula for the first time. Two species (A. diakidius and S. sardiniae) were recorded for the Atlantic Ocean for the first time and the distribution range of S. haploceros and B. tubernatis was extended to the south. The results showed the importance of collecting information from poorly studied regions to achieve a better understanding of the biogeography of marine tardigrades. Finally, intertidal rocky shores were shown to be more diverse than other habitats, probably due to the great habitat heterogeneity.

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“…Two species are currently recognized in the genus Orzeliscus: O. belopus du Bois-Reymond Marcus, 1952and O. septentrionalis Schulz, 1953(see Guidetti and van der Land, 2016. The former is a semi-cosmopolitan species, and recorded from the Brazilian Atlantic coast (Du Bois-Reymond Marcus, 1952), the Northeast Atlantic coasts (Renaud-Debyser, 1963;Pollock, 1971;Renaud-Mornant and Gourbault, 1980;Lampard, 1986), New Caledonia Island (Renaud-Mornant, 1967), the Caribbean Sea (Pollock, 1982;Renaud-Mornant and Gourbault, 1984), the Mediterranean Sea (Grimaldi de Zio et al, 1983, 2003, and the Indian Ocean (Gallo et al, 2007). Orzeliscus septentrionalis was recorded from the North Sea (Schulz, 1953) and the Irish Sea (Moore, 1979), and in times past, regarded as a junior synonym of O. belopus (see Pollock, 1982) or treated as a species inquirenda (Guidetti and Bertolani, 2005).…”

Section: Systematic Accountsmentioning

confidence: 99%

Taxonomic Study of Marine Tardigrades from Korea III. A New Species of the Genus Orzeliscus (Heterotardigrada, Halechiniscidae)

Lee¹,

Rho²,

Chang³

2017

Animal Systematics, Evolution and Diversity

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A new marine tardigrade species of the genus Orzeliscus belonging to the family Halechiniscidae is described from the sea coasts of Korea and Japan. This new species is most characterized in having slender, pole-shaped clava with uniform breadth along its whole length. Furthermore, it evidently differs from the congeners by the combination of characters of a hemispherical protrusion on cheek region of the head, a big and bulbous lateral projection between leg III and leg IV, and an elongate papillus terminating with a minute tube on leg IV. 'Orzeliscus cf. belopus' sensu McKirdy, Schmidt and McGinty-Bayly, 1976 from the Galapagos Islands quite resembles this new species in sharing the slender, pole-shaped clava. However, these two Pacific populations are distinguished to each other by body size and shapes of the protrusion on cheek region and the lateral projection between leg III and leg IV. Scanning electron microscope photographs and a key to species of the genus Orzeliscus are also provided herein.

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The diversity of Indian Ocean Heterotardigrada

Abstract: ABSTRACT

Cited by 18 publications

References 4 publications

The distribution of meiofauna on back-reef sandy platforms in the Maldives (Indian Ocean)

The distribution of meiofauna on back-reef sandy platforms in the Maldives (Indian Ocean)

Biodiversity of marine tardigrades from the northern coast of Portugal (Iberian Peninsula)

Taxonomic Study of Marine Tardigrades from Korea III. A New Species of the Genus Orzeliscus (Heterotardigrada, Halechiniscidae)

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