Redescription of Gnorimosphaeroma oregonense (Dana, 1853) (Crustacea, Isopoda, Sphaeromatidae), designation of neotype, and 16S-rDNA molecular phylogeny of the north-eastern Pacific species

By

Wetzer, Regina
Wall, Adam
Bruce, Niel L.

Type

Article

Date of Publication

2021

Original Publication

ZooKeys

Volume

1037

Pages

23--56

Subjects

Brackish , California , East Pacific , freshwater , intertidal , San Francisco Bay , Tomales Bay , Washington

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.1037.63017

 

Abstract

Gnorimosphaeroma oregonense(Dana, 1852) is revised, a male neotype is designated, photographed, and illustrated; the species occurs from Vancouver British Columbia to the central California coast. 16S-rDNA sequences (~650 bp) for all available ethanol preserved species ofGnorimosphaeromawere used to hypothesize their relationships. Our analyses revealed a sister taxon relationship between the fully marineG. oregonenseand the brackish to freshwater species,G. noblei. The oyster associated and introducedG. rayiis sister to a previously not recognized or identified, but genetically distinct,Gnorimosphaeromasp. collected at two sites in San Francisco Bay.Gnorimosphaeromasp. is probably also a western Pacific species based on its genetic relationship toG. rayi. Photographic comparisons are offered forG. oregonense(marine),G. noblei(freshwater),G. rayi(introduced),G.sp. (presumably introduced), andG. insulare(San Nicolas Island). Records of the holdings at the Los Angeles County Museum of Natural History are summarized. Without material available north of Vancouver through Alaska, the range ofG. oregonensecould not be genetically verified. This review includes a diagnosis and description of the genusGnorimosphaeromaMenzies, 1954.