To increase our knowledge of the biodiversity and distribution of species of Gastrotricha along the tropical-subtropical Brazilian coasts a second collection of a two-year study was made in September 2003. This qualitative investigation focused on 13 sites at 7 locations mostly along the northern coast of the State of São Paulo. Faunistic analysis of 46 records discovered a total of 30 species, an average of 6.85 ± 5.58 species per location and 1.63 ± 1.1 sites per species. Sixteen species in ten genera and four families belong to the Macrodasyida and fourteen species in six genera and two families belong to the Chaetonotida. Ten species appear new to the Brazilian fauna whereas the remainder 20 are taxa already encountered during the 2002 survey. Of the species new to Brazil, five belong to genera unreported from the country thus far i.e., the macrodasyidans Dolichodasys sp.1, Mesodasys sp.1 (Lepidodasyidae), Urodasys viviparus (Macrodasyidae) and Turbanella sp.1 (Turbanellidae), and the chaetonotidan Draculiciteria tesselata (Xenotrichulidae). The Turbanella, two Macrodasys and two Chaetonotus species are undescribed taxa and thus far endemic to the Brazilian coast whereas Urodasys viviparus and Draculiciteria tesselata are known as regional cosmopolitans and Aspidiophorus tentaculatus is amphi-Atlantic in distribution. The macrodasyidans, Paraturbanella sp. 1 and Pseudostomella sp. 1, and the chaetonotidan Heteroxenotrichula sp.1, are the most common species, in agreement with our previous 2002 findings. However, this time, in contrast with the previous survey we found Tetranchyroderma sp.1 only once, whereas in spring 2002 the species was very common. It is possible that seasonality has much to do with the contrasting findings. Overall data indicate that the investigated area supports a good number of gastrotrich species (ca 50 spp) of both Macrodasyida and Chaetonotida orders. Our knowledge of biodiversity is likely to increase as new locations are surveyed; to maximize results study should concentrate on sandy bottom made up of fine-to-medium grain size surrounded by clear waters.
|Anno di pubblicazione:||2005|
|Titolo:||Further data on marine gastrotrichs from the State of São Paulo State and the first records from the State of Rio de Janeiro (Brazil)|
|Autori:||TODARO M.A.; ROCHA C.E.F|
|Appare nelle tipologie:||Articolo su rivista|
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