Identification guide to skates (Family Rajidae) of the Canadian Atlantic and adjacent regions
Kenneth J. SulakP. D. MacWhirterKathie LukeApril D. NoremJohn Maurice MillerJ. A. CooperLee E. Harris
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This short note describes the first record of the Norwegian skate, Dipturus nidarosiensis (Storm, 1881), in the Strait of Sicily. A male specimen of 95.6 cm total length and 3466 g weight was caught on December 2017 during a bottom trawl survey at a mean depth of 551 m. Information on biometric, sexual maturity, stomach content, and age estimation were provided. This finding confirms the occurrence of the species in the Strait of Sicily, previously suggested by the record of an empty egg case in 2015, thus contributing to the knowledge on the distribution of the species in the Mediterranean Sea.
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A new species of rajin skate, Zearaja maugeana sp. nov., is described on the basis of specimens from two estuaries in remote southwestern Tasmania. The species, known locally as the Maugean Skate, has been assessed as Endangered in the IUCN Red List of Threatened Animals based on its rarity and very narrow geographic range. It is also one of the few skates worldwide to occur mainly in brackish water. The Maugean Skate belongs to a group of anatomically conservative, Dipturus-like skates conforming to the currently unrecognized genus Zearaja Whitley. This ancient group, with a Gondwanan lineage possibly dating back to the Cretaceous, contains at least two other species: Z. nasuta from New Zealand and Z. chilensis from South America. The skeletal morphologies of the Zearaja species are compared with typical Dipturus skates and their phylogenetic position discussed.
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