Sponges from the 2010-2014, and 2017 Paamiut, and 2019 Helga Maria multispecies trawl surveys, eastern Arctic and subarctic : class Demospongiae, subclass Heteroscleromorpha, order Poecilosclerida, family...: Fs97-6/3559E-PDF

"Sponges (phylum Porifera) play an important role in habitat creation and nutrient cycling. However, despite these key functional roles, sponge communities in Arctic marine environments are still poorly known. Sponges were collected between 2010-2014, in 2017 and in 2019 during annual multispecies trawl surveys conducted by Fisheries and Oceans Canada in Baffin Bay, Davis Strait and portions of Hudson Strait. They were taxonomically examined under a microscope. Approximately 2800 sponge specimens were identified, comprising ~100 known sponge taxa. Here, results from the analysis of the family Iotrochotidae Dendy, 1922 are presented. This family currently has 6 genera and 35 valid species and is characterized by the possession of birotula microscleres in its skeleton. Thirty specimens collected from 442 to 1319 m depth were examined. Five taxa have been identified, all of them belonging to the Genus Iotroata (Laubenfels, 1936). Most of our specimens are Iotroata affinis (Lundbeck, 1905). The other described species include Iotroata polydentata (Lundbeck, 1905), as well as Iotroata sp.1, Iotroata sp.2, and Iotroata sp.3., which are likely new species. For each species a physical description, a discussion of their distinguishing characteristics, the dimensions and descriptions of their spicules, and a taxonomic discussion is included"--Abstract, page iv.

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