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New species and new records of freshwater Heterolepidoderma (Gastrotricha: Chaetonotidae) from Brazil with an identification key to the genus

Zootaxa, 2015
A new species of freshwater Heterolepidoderma (Gastrotricha) was found in Brazil. Heterolepidoderma mariae sp. nov. is unique in possessing a three-lobed head, three types of dorsal keeled scales, a thin band of cilia on the head, connecting the two bands of ventral cilia, and an interciliary area with elliptical keeled scales with short spines ...
Garraffoni, André R. S., Melchior, Marina P. +1 more
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Two new interesting genera of Gastrotricha (Macrodasyida and Chaetonotida) from the Brazilian freshwater psammon [PDF]

Hydrobiologia, 1987
Two new genera and species of Gastrotricha are described from the psammon of a freshwater body in Brazil: Redudasys fornerise and Arenotus strixinoi. The former is the first undoubted member of the order Macrodasyida recorded from a freshwater environment.
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A huge undescribed diversity of the subgenus Hystricochaetonotus (Gastrotricha, Chaetonotidae, Chaetonotus) in Europe

2022
Secondary structure of the 18S rRNA molecule of Chaetonotus (Hystricochaetonotus) mirabilis sp. nov. The single diagnostic molecular autapomorphy (red arrow) is situated in the terminal loop of helix 21es6c in the V4 region of the C domain. Note the long-range tertiary contacts between the V2 and V4 regions (highlighted in pink).
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Comparative sperm ultrastructure of Neodasys ciritus and Musellifer delamarei , two species considered to be basal among Chaetonotida (Gastrotricha)