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A new species of Ligiarctus (Tardigrada, Arthrotardigrada) from the Brazilian continental shelf, Southwestern Atlantic Ocean
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Orientador(es)
Resumo(s)
A new marine arthrotardigrade, Ligiarctus alatus
sp. nov. found in sediments of the Brazilian continental shelf
(100–150 m depth) in the Southwestern Atlantic Ocean, is
described in this study. This new species was recorded from
sites located in the major oil extraction basins in Brazil
(Campos and Potiguar basins). Within the subfamily
Floractinae, the genus Ligiarctus characteristically presents
primary clavae bent backwards, occupying the reduced lateral
edges of the head. The new species is clearly distinguishable
from L. eastwardi, the only known species of the genus, by the
presence of internal distal notches on all claws, and six aliform
cuticular expansions (frontal ala, two anterolateral alae, two
posterolateral alae and caudal ala) with continuous digitiform
procuticular supports (caesti). Ligiarctus eastwardi has only a
caudal ala without caesti and internal notches are present on
external claws only. The same pattern of cuticular expansions
and caesti exhibited by the new species also occurs in the
genus Florarctus, increasing the difficulty of defining the taxonomy
of the subfamily Florarctinae, and forcing the
emendment of the generic diagnosis of Ligiarctus.
Descrição
Palavras-chave
Arthrotardigrada Florarctinae Ligiarctusalatus sp. nov Meiobenthos Sublittoral
Contexto Educativo
Citação
Marine Biodiversity, 48(1), 5-12. Doi.: 10.1007/s12526-017-0709-0
Editora
Springer Verlag