TY - JOUR
T1 - Two new species of freshwater crayfish of the genus Faxonius (Decapoda
T2 - Cambaridae) from the Ozark Highlands of Arkansas and Missouri
AU - Fetzner, James W.
AU - Taylor, Christopher A.
N1 - Funding Information:
We are grateful to the Missouri Department of Conservation Crayfish Crew (including Robert DiStefano, Drew White, Dusty Swedberg, Gabrielle Elliot, Cheyenne Stratton, Emily Imhoff, Matthew Nolen, Hallie Ladd, Jeff Brittain, Steve Olson, Lynne Johnson, Michael Moore, Kaitlyn Bradley, Catlin Ames and Matt Vincenti), Christopher J. Rice of the Illinois Natural History Survey, the Arkansas Game and Fish Commission field crew (Justin Stroman, Brian Wagner and Matthew Nolen), and the Arkansas Cooperative Fisheries Unit crew (Brett Garrison, Allyson Yarra, Nicole Graham, Katherine Magoulick, Bailey Stein and Dan Magoulick) for their assistance in collecting specimens for the initial genetics project that ultimately resulted in this paper. Thanks to Brian K. Wagner and Derek Filipek for their assistance in the field while the first author went to collect additional specimens for use in these descriptions. We thank Courtney Wickel and Rafael Lemaitre at the United States National Museum for sending the types of Faxonius eupunctus so they could be examined and included in the morphological analyses. Special thanks to Guenter A. Schuster for photographing and creating the individual species plates that appear within. Portions of this project were funded by the Missouri Department of Conservation, the Arkansas Game and Fish Commission, and the U.S. Fish and Wildlife Service.
Publisher Copyright:
© Copyright 2018 Magnolia Press.
PY - 2018/3/23
Y1 - 2018/3/23
N2 - Two new species of freshwater crayfish are described from the Ozarks Plateau of northern Arkansas and southern Mis-souri. Both species are restricted to the mainstem of rocky streams that are at least fourth-order or greater in size. Recent genetic and morphological investigations of the coldwater crayfish, Faxonius eupunctus Williams, 1952, indicated that it was actually composed of several undescribed species. Faxonius eupunctus is herein restricted to just the Eleven Point River system. Faxonius roberti, new species is found in the mainstem of the Spring and Strawberry river systems in north-ern Arkansas. It differs from F. eupunctus by lacking a male Form-I gonopod with a distal spatulate mesial process, and presence of two spines on the dorsal side of the merus, where F. eupunctus typically has 1 spine. Faxonius wagneri, new species is known from a 54 mile (86 km) stretch of the Eleven Point River mainstem, ranging from just southeast of Greer, Missouri to just north of Birdell, Arkansas. Faxonius wagneri can be differentiated from both F. eupunctus and Faxonius roberti sp. nov. by using the male Form-I and Form-II gonopods, the shape of the chelae, and the female annulus ventralis. In F. wagneri, the terminal elements of the first pleopod are almost twice as long as those in F. eupunctus and F. roberti, with the tips of the appendage reaching the posterior base of the first perieopod when the abdomen is flexed forward, whereas, in the other two species, these elements only reach the base of the second pereiopod. The species also possesses two spines on the dorsal side of the merus of the first pereiopod, which helps distinguish it from F. eupunctus.
AB - Two new species of freshwater crayfish are described from the Ozarks Plateau of northern Arkansas and southern Mis-souri. Both species are restricted to the mainstem of rocky streams that are at least fourth-order or greater in size. Recent genetic and morphological investigations of the coldwater crayfish, Faxonius eupunctus Williams, 1952, indicated that it was actually composed of several undescribed species. Faxonius eupunctus is herein restricted to just the Eleven Point River system. Faxonius roberti, new species is found in the mainstem of the Spring and Strawberry river systems in north-ern Arkansas. It differs from F. eupunctus by lacking a male Form-I gonopod with a distal spatulate mesial process, and presence of two spines on the dorsal side of the merus, where F. eupunctus typically has 1 spine. Faxonius wagneri, new species is known from a 54 mile (86 km) stretch of the Eleven Point River mainstem, ranging from just southeast of Greer, Missouri to just north of Birdell, Arkansas. Faxonius wagneri can be differentiated from both F. eupunctus and Faxonius roberti sp. nov. by using the male Form-I and Form-II gonopods, the shape of the chelae, and the female annulus ventralis. In F. wagneri, the terminal elements of the first pleopod are almost twice as long as those in F. eupunctus and F. roberti, with the tips of the appendage reaching the posterior base of the first perieopod when the abdomen is flexed forward, whereas, in the other two species, these elements only reach the base of the second pereiopod. The species also possesses two spines on the dorsal side of the merus of the first pereiopod, which helps distinguish it from F. eupunctus.
KW - Crayfish
KW - Faxonius
KW - Life history
KW - Morphology
KW - New species
KW - Orconectes
KW - Phylogeny
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UR - http://www.scopus.com/inward/citedby.url?scp=85044346923&partnerID=8YFLogxK
U2 - 10.11646/zootaxa.4399.4.2
DO - 10.11646/zootaxa.4399.4.2
M3 - Article
C2 - 29690291
AN - SCOPUS:85044346923
SN - 1175-5326
VL - 4399
SP - 491
EP - 520
JO - Zootaxa
JF - Zootaxa
IS - 4
ER -