Burrowing mud shrimps (Decapoda: Axiidea & Gebiidea) of the northeastern Black Sea and their external parasites

The article presents a brief review on the fauna of the axiidean and gebiidean burrowing mud shrimps and their external parasites in the northeastern coast of the Black Sea, where only two rather common species, Gilvossius candidus (Olivi, 1792) and Upogebia pusilla (Petagna, 1792) (Gebiidea: Upogebiidae), were previously recorded. Necallianassa truncata (Giard & Bonnier, 1890) is confirmed and Gilvossius tyrrhenus (Petagna, 1792) (Axiidea: Callianassidae) is firstly recorded for the shallow waters of the northeastern Black Sea, where it was previously probably confused with common and widely distributed Gilvossius candidus (Olivi, 1792). Color photographs of the four species, enhancing the recognition of those species in fields, are provided.