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A new species of the genus paracytaeis (cnidaria, hydrozoa) from the Adriatic sea

An unknown hydromedusa species belonging to the genus Paracytaeis (Anthoathecata, Cytaeididae) is collected from the open sea of the southern Adriatic in winters of 2016., 2020. and 2021. Only two species from this genus are known, P. octona and P. meteoris. So far, only medusa stage of both speies are described. The last one is doubtfoul species due to inadequate description of only single specimen from near the Cape Verde Islands (Atlantic Oceans). However, our species can be distinguished from its congeners, among others features, by the number of oral tentacles in adult specimens. Specimens were sequenced (COI, 16S) and the obtained sequences were searched against the GenBank database using the Blast tool. The search showed that no identical sequence existed in GenBank. However, no data of any of two Paracytaeis species existed in the Genbank. Nevertheless, this analysis confirm that species belong to the family Cytaeididae. Relatively high number of specimens (1.0 ind/m3) were occurred in a situation with high salinity conditions (38.8 - 39.3) in all years when they are registered. High salinity condition indicates strong inflow of Eeast Mediterranean water into Adriatic Sea. Therefore, our Paracytaeis species might be a Lessepsian migrant of Indo-Pacific origin.

Hydromedusa, Paracytaeis, new species, Adriatic Sea

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