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Infraorder Brachyura // Family Varunidae // Genus Brachynotus
  Brachynotus sexdentatus (Rissо, 1827) Larvae development
Synonym: Heterograpsus Lucasi M. Edw. Ulyanin, 1872 For Black Sea
It lives in the North-East Atlantic from Great Britain to the north-east of Spain, in the seas of the Mediterranean basin, in the Black and Azov seas. It occurs in the coastal zone, mainly on sandy, silty-sandy soil and on small shell rock, as well as in fouling and under algae heaps (Kobyakova, Dolgopolskaya, 1969). It can also be found on silty soils (Chernyavsky, 1884). According to research reports at the beginning of the 20th century, this species was very numerous on silty and silty-sandy soils in estuaries and estuaries of the rivers of the Azov-Black Sea basin. In 1949, it was indicated as a characteristic species in the biocenoses of Balanus, Mytilaster, Cardium, Syndesmia, Hydrobia, Nephthys, Corbulomya in all regions of the Sea of ​​Azov (Vorobiev, 1949). At present time, there are only invasive species Rhithropanopeus harrisii, is found in these places, which has a similar lifestyle, while B. sexdentatus is absent in the collections from the Sea of ​​Azov and the Kerch Strait (Anosov and Marin, 2010). A decrease in the frequency of occurrence and range of this crab in the Black Sea is also noted by Romanian scientists (Micu, Micu, 2006).
North East Atlantic Mediterranean Sea Black Sea Azov Sea
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