Sebastes diaconus (the Deacon Rockfish)

Sebastes diaconus

OSIC scientists Ben Frable and Brian Sidlauskas, in collaboration with Wolfe Wagman and Taylor Frierson of the Oregon Department of Fish and Wildlife, and Andres Aguilar of California State University, Los Angeles, have described a new species of rockfish, Sebastes diaconus (the Deacon Rockfish) from the coastal waters of Oregon, Washington and California. The full description is available here.

Oregon’s most common fish represents at least three species

Past OSIC graduate student Kendra Hoekzema and her advisor Brian Sidlauskas used molecular tools to demonstrate that populations of speckled dace (Rhinichthys osculus) in Oregon’s Great Basin diverged from each other millions of years ago and likely represent at least three distinct, but cryptic species.  You can read the press release about their work here. Specimens and DNA samples from their work are deposited in the OSIC.

Photo: Kendra Hoekzema (OSU) and Dave Banks (ODFW) take tissue samples from speckled dace at a mobile lab set up on the tailgate of the truck near the collection site in Eastern Oregon. Photo Credit:  Brian Sidlauskas.

A new species of Leporinus from the Orinoco Basin, Venezuela

OSIC graduate students Ben Frable and Michael Burns and curator Brian Sidlauskas recently described Leporinus arimaspi from extensive series of fishes collected in the Orinoco basin of Venezula.  The name refers to the legendary Arimaspi people of northern Scythia, whose purported possession of just a single eye is reminiscent of the dark spot at the center of the body of the newly described species.

Image: A young specimen of the new species, Leporinus arimaspi (ANSP 182663).  Photo credit:  Mark Sabaj Perez

The first molecular phylogeny of the Neotropical headstanding fishes in family Chilodontidae

In collaboration with OSIC researchers, Bruno Melo and Claudio Oliveira of the State University of São Paulo, Brazil inferred the first DNA-based phylogeny for this Neotropical fish family phylogeny.  Results suggest that some described species are not valid, while others may represent complexes of cryptic and undescribed species.  Some of the specimens on which the work is based are housed in the OSIC.

Photo: Eight species of headstanding chilodontid fishes (From Melo et al., 2014).

Phylogeography of Rhinichthys cataractae

Daemin Kim

Daemin Kim and Kevin Conway of Texas A&M University based part of their rangewide phylogeographic study of Rhinichthys cataractae on OSIC specimens.

Photo: Daemin Kim