Description of four new species of hagfishes from the Galapagos Islands, Ecuador


SOCIETY FOR INTEGRATIVE AND COMPARATIVE BIOLOGY
2021 VIRTUAL ANNUAL MEETING (VAM)
January 3 – Febuary 28, 2021

Meeting Abstract


28-9  Sat Jan 2  Description of four new species of hagfishes from the Galapagos Islands, Ecuador Fudge, DS*; Plachetzki, DC; McCord, CL; Winegard, TM; Fernholm, B; Gonzalez, CJ; Mincarone, MM; Chapman University; University of New Hampshire; Chapman University, California State University Dominguez Hills; Chapman University; Swedish Museum of Natural History; University of New Hampshire; Universidade Federal do Rio de Janeiro fudge@chapman.edu http://sites.chapman.edu/fudge

Hagfishes are an ancient group of benthic marine craniates that are found in deep or cold waters around the world. In the Galápagos Islands, four species of hagfishes were known: Eptatretus bobwisneri, E. grouseri, E. mccoskeri, and Rubicundus lakeside. During recent expeditions to the Galápagos, six species of hagfishes were collected, including four undescribed species of the genera Eptatretus and Myxine. In this talk, I will provide a review of the eight species of hagfishes from the Galápagos Islands, with an emphasis on the four new species. Our species delineations were based on both morphological and molecular analyses. One of the new Myxine species described is remarkable as it is the only hagfish known to completely lack melanin-based pigments. A phylogenetic hypothesis based on molecular data suggests that Galápagos hagfishes, in contrast to terrestrial animals like Darwin’s finches, arose from multiple independent colonisations of the islands from as many as five different ancestral lineages. The large number of endemic hagfishes in the geologically young Galápagos Islands suggests that there is much global hagfish diversity yet to be discovered.

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