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虽然承认在地中海,theMacropodia czernjawskiispider crab was ignored by scientists (even by its namesake Vladimir Czernyavsky) in the regional faunal accounts of the Black Sea for more than a century. At the same time, although other species of the genus have been listed as Black sea fauna, those listings are mostly wrong and occurred either due to historical circumstances or misidentifications.
Now, scientists re-describe this, most likely, only species of the genus occurring in the Black Sea in the open-access journalZoosystematics and Evolution.
The spider crab genusMacropodiawas discovered in 1814 and currently includes 18 species, mostly occurring in the Atlantic and the Mediterranean. The marine fauna of the Black Sea is predominantly of Mediterranean origin andMacropodia czernjawskiiwas firstly discovered in the Black Sea in 1880, but afterwards, its presence there was largely ignored by the scientists.
After the revision of available type specimens from all available collections in the Russian museums and the Senckenberg Museum in Frankfurt-on-Main, as well as newly collected material in the Black Sea and the North-East Atlantic, a research team of scientists, led by Dr Vassily Spiridonov from Shirshov Institute of Oceanology of Russian Academy of Sciences, re-describedMacropodia czernjawskiiand provided the new data on its records and updated its ecological characteristics.
"The analysis of the molecular genetic barcode (COI) of the available material ofMacropodiaspecies indicated thatM. czernjawskiiis a very distinct species while M. parva should be synonimised with M. rostrata, and M. longipes is a synonym of M. tenuirostris," states Dr Spiridonov sharing the details of the genus analysis.
AllMacropodiaspecies have epibiosis andM. czernjawskiiis no exception: almost all examined crabs in 2008-2018 collections had significant epibiosis. It normally consists of algae and cyanobacteria and, particularly, a non-indigenous species of red alga Bonnemaisonia hamifera, officially reported in 2015 at the Caucasian coast of the Black Sea, was found in the epibiosis ofM. czernjawskiifour years earlier.
"It improves our understanding of its invasion history. Museum and monitoring collections of species with abundant epibiosis (in particular inachid crabs) can be used as an additional tool to record and monitor introduction and establishments of sessile non-indigenous species," suggests Dr Spiridonov.
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