A new species of Dynoides Barnard, 1914 (Crustacea, Isopoda, Sphaeromatidae) from Canada, with notes on geographic distribution of the north-eastern Pacific Ocean species

ABSTRACT

Dynoides canadensis sp. nov. is described from the south-western coast of British Columbia, Canada. This species differs from its closely related species, D. elegans (Boone, 1923) ), by the presence of a smooth pleotelson without prominent rounded tubercle on the basal part of the pleotelsonic sinus, its sinus wall lacking crenulation; in having the penial processes length 7.7 × basal width and acute distal apex instead of 2.3 × basal width and rounded and blunt distal apex in D. elegans. This new species also has an appendix masculina with the distal apex extending somewhat beyond its base, instead of not reaching the base as is the case for D. elegans. A map of the distribution for the north-eastern Pacific species of Dynoides Barnard, 1914 (D. elegans (Boone, 1921); D. crenulatus and D. saldanai Carvacho & Haasmann, 1984; and D. dentisinus Shen 1929) in the north-eastern Pacific is provided. The new species is abundant in the western coastal zone of British Columbia. A revised generic diagnosis is provided for the genus Dynoides.

Publication LSID: lsid:http://zoobank.org:pub:ADF85BE9-C307-43EA-B270-1B2DB2F61883

KEYWORDS:

• Isopoda
• Sphaeromatidae
• Dynoides
• new species
• British Columbia
• East Pacific

Acknowledgements

We are particularly grateful to Dr Robert Anderson for provision of the laboratory and to Mr. Philippe Ste-Marie for is assistance facilities during the first author visit to the Canadian Museum of Nature, Ottawa, in 2019. Dr Niel Bruce (Queensland Museum), Dr. Saskia Brix (Senckenberg Research Institute, Germany) and Dr Brenda Doti (Universidad de Buenos Aires, Argentina) are thanked for their constructive suggestions and comments that improved the manuscript. Financial support for this study was provided by Canadian Museum of Nature Visiting Scientist Awards 2019, and Shahrekord University, Iran.

Disclosure statement

No potential conflict of interest was reported by the author(s).