DOCSLIB.ORG

Hobbseus Attenuatus Black 1969 Pearl Riverlet Crayfish

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Hobbseus Attenuatus Black 1969 Pearl Riverlet Crayfish Hobbseus attenuatus Black 1969 Pearl riverlet crayfish Photo not available. Distribution, Habitat, and Behavior Hobbseus attenuatus is endemic to Mississippi. Black (1969) originally reported the species from the Pearl River drainage, Mississippi, including five locations in Winston County and one in Neshoba County. In addition, the MS crayfish database (this website) includes one record (# 1634) from the Noxubee River watershed (Tombigbee River basin) in Oktibbeha County, but the identification was based on a form II male and the location description was vague. Moreover, Fitzpatrick identified the specimen in record # 1634, but he did not include that location in a later species summary (Fitzpatrick 1996), so the record is suspect. He later included both Oktibbeha and Itawamba counties in the species’ range (Fitzpatrick 2002), but the location of voucher specimens from the latter is unknown. The type locality was a roadside ditch that had water “in all but severe drought conditions” and had “abundant submergent and emergent aquatic vegetation” (Black 1969). The crayfish were collected with dipnets from open water. All specimens collected for the species description came from temporary aquatic habitats, and thus, the species is presumably a secondary burrower (Black 1969). Life Colors and Distinctive Characters The following color and character descriptions are adapted from Black (1969). Hobbseus attenuatus’ carapace has an olive-brown background color with darker flecks on the dorsal surface and blotches on the sides. The abdomen is medium brown tinged with pink, the latter increasing laterally and caudally. There is an overall appearance of a poorly defined, darker brown stripe extending along the mid-dorsal area. Along either side of the mid-dorsal line of the abdomen is the appearance of three stripes: a dark stripe, a 1-mm wide, pinkish-brown stripe, and then a well-defined, dark brown stripe. The dorsal side of the chelae are pinkish-brown with olive-brown blotches. Hobbseus attenuatus has an open areola and a flat, ovate rostrum that lacks marginal spines and either lacks an acumen or has a small, upturned, tuberculate acumen. The species lacks cervical spines as well as terminal spines on the postorbital ridges. The anterior 2/3 of the antennal scale is rounded and the widest point is about 2/3 of the way from the base to the tip. The chelae have a row of about 13-17 tubercles on the inner margin of the wide, somewhat inflated, palm. Form I males have strong, simple hooks on the third pair of pereiopods (legs). The form I male gonopod has a central projection and a very slender mesial process both directed at a 90 degree angle to the shaft of the gonopod. The mesial process has a prominent knob near its base. Roughly 40 % of the length of the mesial process extends beyond the tip of the central projection. The gonopods are symmetrical and rest in a trough formed by conspicuous, setiferous, processes that project ventrally from the base of the third and fourth pairs of walking legs. The female annulus ventralis is moveable and has an S-shaped sinus originating in a cephalic depression and extending toward, but not intersecting, the caudal margin. The sternal plate caudal to the annulus ventralis has a median depression. Size The three type specimens had carapace lengths ranging from 16.0 to 19.5 mm (Black 1969). Most Like Hobbseus attenuatus is superficially similar to all other Hobbseus species. However, only in H. petilus and H. cristatus does the mesial process of the gonopod curve at approximately 90 degrees as in H. attenuatus. Only H. attenuatus has a prominent knob at the base of the mesial process. The mesial process of H. petilus has an undulating curve rather than being straight as in H. attenuatus. Compared to H. attenuatus, H. cristatus has a much thicker mesial process and more sharp-tipped central projection, the latter recurving at about 65 rather than 90 degrees. Among females, H. attenuatus’ combination of a sub-triangular annulus ventralis and an oval post-annular sclerite with a median depression are unique among Hobbseus species. Life History Form I males were collected in late May, June, August, and December, and “medium sized juveniles” were collected in late December (Black 1969; MS crayfish database, this website). Crayfish Associates Other crayfishes reported to occur with H. attenuatus include Cambarus diogenes, Fallicambarus fodiens, Procambarus acutus acutus, and P. planirostris (Black 1969), although the MS crayfish database (this website) does not include records of P. planirostris within the range of H. attenuatus. Conservation Status IUCN Red List: Data Deficient American Fisheries Society ranking: Endangered Heritage global ranking: G2 (imperiled) State of Mississippi: Tier 1 (in need of immediate conservation action and/or research)(MDWFP 2005). See (Taylor et al. 2007) for further explanation of American Fisheries Society and Heritage rankings. Species Description Black, J. B. 1969. A new crawfish of the genus Hobbseus from Mississippi (Decapoda, Astacidae). Proceedings of the Biological Society of Washington 82:193-200. Literature Cited Black, J. B. 1969. A new crawfish of the genus Hobbseus from Mississippi (Decapoda, Astacidae). Proceedings of the Biological Society of Washington 82:193-200. Fitzpatrick, J. F., Jr. 1996. Rare and endangered crawfishes of Mississippi. Museum Technical Report No. 93, Mississippi Department of Wildlife, Fisheries, and Parks, Jackson. Fitzpatrick, J. F., Jr. 2002. The conservation status of Mississippi crawfishes (Crustacea: Decapoda: Cambaridae). Louisiana Academy of Sciences 63:25-36. IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <www.iucnredlist.org>. Downloaded on 25 April 2012. MDWFP, Mississippi Department of Wildlife, Fisheries, and Parks. 2005. Appendix VIII: Mississippi's species of greatest conservation need by ecoregion. Pages 375-380 Mississippi's Comprehensive Wildlife Conservation Strategy 2005- 2015, version 1.1, Jackson, MS (http://home.mdwfp.com/more.aspx). Taylor, C. A., G. A. Schuster, J. E. Cooper, R. J. DiStefano, A. G. Eversole, P. Hamr, H. H. Hobbs, III, H. W. Robison, C. E. Skelton, and R. F. Thoma. 2007. A reassessment of the conservation status of crayfishes of the United States and Canada after 10+ years of increased awareness. Fisheries 32:372-389. Fact sheet author Susan B. Adams Revision date and version 25 April 2012, version 1.2 Recommended citation Adams, S. B. 2012. Hobbseus attenuatus. Version 1.2. USDA Forest Service, Crayfishes of Mississippi website, Oxford, MS. (URL) .
Load more

Recommended publications
  • New Alien Crayfish Species in Central Europe
    NEW ALIEN CRAYFISH SPECIES IN CENTRAL EUROPE Introduction pathways, life histories, and ecological impacts DISSERTATION zur Erlangung des Doktorgrades Dr. rer. nat. der Fakultät für Naturwissenschaften der Universität Ulm vorgelegt von Christoph Chucholl aus Rosenheim Ulm 2012 NEW ALIEN CRAYFISH SPECIES IN CENTRAL EUROPE Introduction pathways, life histories, and ecological impacts DISSERTATION zur Erlangung des Doktorgrades Dr. rer. nat. der Fakultät für Naturwissenschaften der Universität Ulm vorgelegt von Christoph Chucholl aus Rosenheim Ulm 2012 Amtierender Dekan: Prof. Dr. Axel Groß Erstgutachter: Prof. Dr. Manfred Ayasse Zweitgutachter: Prof. apl. Dr. Gerhard Maier Tag der Prüfung: 16.7.2012 Cover picture: Orconectes immunis male (blue color morph) (photo courtesy of Dr. H. Bellmann) Table of contents Part 1 – Summary Introduction ............................................................................................................................ 1 Invasive alien species – a global menace ....................................................................... 1 “Invasive” matters .......................................................................................................... 2 Crustaceans – successful invaders .................................................................................. 4 The case of alien crayfish in Europe .............................................................................. 5 New versus Old alien crayfish .......................................................................................
    [Show full text]
  • Crayfishes and Shrimps) of Arkansas with a Discussion of Their Ah Bitats Raymond W
    Journal of the Arkansas Academy of Science Volume 34 Article 9 1980 Inventory of the Decapod Crustaceans (Crayfishes and Shrimps) of Arkansas with a Discussion of Their aH bitats Raymond W. Bouchard Southern Arkansas University Henry W. Robison Southern Arkansas University Follow this and additional works at: http://scholarworks.uark.edu/jaas Part of the Terrestrial and Aquatic Ecology Commons Recommended Citation Bouchard, Raymond W. and Robison, Henry W. (1980) "Inventory of the Decapod Crustaceans (Crayfishes and Shrimps) of Arkansas with a Discussion of Their aH bitats," Journal of the Arkansas Academy of Science: Vol. 34 , Article 9. Available at: http://scholarworks.uark.edu/jaas/vol34/iss1/9 This article is available for use under the Creative Commons license: Attribution-NoDerivatives 4.0 International (CC BY-ND 4.0). Users are able to read, download, copy, print, distribute, search, link to the full texts of these articles, or use them for any other lawful purpose, without asking prior permission from the publisher or the author. This Article is brought to you for free and open access by ScholarWorks@UARK. It has been accepted for inclusion in Journal of the Arkansas Academy of Science by an authorized editor of ScholarWorks@UARK. For more information, please contact [email protected], [email protected]. Journal of the Arkansas Academy of Science, Vol. 34 [1980], Art. 9 AN INVENTORY OF THE DECAPOD CRUSTACEANS (CRAYFISHES AND SHRIMPS) OF ARKANSAS WITH A DISCUSSION OF THEIR HABITATS i RAYMOND W. BOUCHARD 7500 Seaview Avenue, Wildwood Crest, New Jersey 08260 HENRY W. ROBISON Department of Biological Sciences Southern Arkansas University, Magnolia, Arkansas 71753 ABSTRACT The freshwater decapod crustaceans of Arkansas presently consist of two species of shrimps and 51 taxa of crayfishes divided into 47 species and four subspecies.
    [Show full text]
  • Decapoda: Cambaridae) of Arkansas Henry W
    Journal of the Arkansas Academy of Science Volume 71 Article 9 2017 An Annotated Checklist of the Crayfishes (Decapoda: Cambaridae) of Arkansas Henry W. Robison Retired, [email protected] Keith A. Crandall George Washington University, [email protected] Chris T. McAllister Eastern Oklahoma State College, [email protected] Follow this and additional works at: http://scholarworks.uark.edu/jaas Part of the Biology Commons, and the Terrestrial and Aquatic Ecology Commons Recommended Citation Robison, Henry W.; Crandall, Keith A.; and McAllister, Chris T. (2017) "An Annotated Checklist of the Crayfishes (Decapoda: Cambaridae) of Arkansas," Journal of the Arkansas Academy of Science: Vol. 71 , Article 9. Available at: http://scholarworks.uark.edu/jaas/vol71/iss1/9 This article is available for use under the Creative Commons license: Attribution-NoDerivatives 4.0 International (CC BY-ND 4.0). Users are able to read, download, copy, print, distribute, search, link to the full texts of these articles, or use them for any other lawful purpose, without asking prior permission from the publisher or the author. This Article is brought to you for free and open access by ScholarWorks@UARK. It has been accepted for inclusion in Journal of the Arkansas Academy of Science by an authorized editor of ScholarWorks@UARK. For more information, please contact [email protected], [email protected]. An Annotated Checklist of the Crayfishes (Decapoda: Cambaridae) of Arkansas Cover Page Footnote Our deepest thanks go to HWR’s numerous former SAU students who traveled with him in search of crayfishes on many fieldtrips throughout Arkansas from 1971 to 2008. Personnel especially integral to this study were C.
    [Show full text]
  • Summary Report of Freshwater Nonindigenous Aquatic Species in U.S
    Summary Report of Freshwater Nonindigenous Aquatic Species in U.S. Fish and Wildlife Service Region 4—An Update April 2013 Prepared by: Pam L. Fuller, Amy J. Benson, and Matthew J. Cannister U.S. Geological Survey Southeast Ecological Science Center Gainesville, Florida Prepared for: U.S. Fish and Wildlife Service Southeast Region Atlanta, Georgia Cover Photos: Silver Carp, Hypophthalmichthys molitrix – Auburn University Giant Applesnail, Pomacea maculata – David Knott Straightedge Crayfish, Procambarus hayi – U.S. Forest Service i Table of Contents Table of Contents ...................................................................................................................................... ii List of Figures ............................................................................................................................................ v List of Tables ............................................................................................................................................ vi INTRODUCTION ............................................................................................................................................. 1 Overview of Region 4 Introductions Since 2000 ....................................................................................... 1 Format of Species Accounts ...................................................................................................................... 2 Explanation of Maps ................................................................................................................................
    [Show full text]
  • Brazos Dwarf Crayfish (Cambarellus Texanus) Ecological Risk Screening Summary
    Brazos Dwarf Crayfish (Cambarellus texanus) Ecological Risk Screening Summary U.S. Fish & Wildlife Service, April 2014 Revised, October 2016 Web Version, 11/17/2017 Photo: © Keith A. Crandall. Licensed under Creative Commons Attribution-NonCommercial- ShareAlike License. Available: http://tolweb.org/Cambarellus_(Pandicambarus)_texanus. (October 2016). 1 Native Range and Status in the United States Native Range From Fetzner (2016): “East of the Lavaca River and Bay to the Brazos River drainage system, Texas.” Status in the United States From Alvarez et al. (2010): “This species was first found in a ditch near Bay City in Matagorda County, Texas. It has since been found in the Colorado River, Fort Bend County, and Waller County. It is thought that the range is bound by the Lavaca River and Bay on the west, though the northward and eastward range limits are not known (Albaugh and Black 1973).” “This species has been collected from 31 sites and is believed to be common at most sites (D. Johnson pers. comm. 2009).” 1 Means of Introductions in the United States This species has not been reported as introduced outside of its native range in the United States. Remarks From NatureServe (2015): “It is found only in Texas in a small range near the central Texas coast (Johnson and Johnson, 2008). It has a larger range than Cambarellus ninae, but does occur in an area that is experiencing urban growth; however populations appear stable and there is no evidence of decline.” 2 Biology and Ecology Taxonomic Hierarchy and Taxonomic Standing From ITIS
    [Show full text]
  • 374 Species in Substantial 90-Day Petition Finding
    U.S. Fish & Wildlife Service 374 Species in Substantial 90-Day Petition Finding Scientific Name Common Name Taxon/Validity Reported Range Ambystoma barbouri Streamside salamander Amphibian IN, OH, KY, TN, WV Amphiuma pholeter One-Toed Amphiuma Amphibian FL, AL, GA, MS Cryptobranchus alleganiensis Hellbender Amphibian IN, OH, WV, NY, PA, MD, GA, SC, MO, AR Desmognathus abditus Cumberland Dusky Salamander Amphibian TN Desmognathus aeneus Seepage Salamander Amphibian NC, TN, AL, SC, GA Eurycea chamberlaini Chamberlain's Dwarf Salamander Amphibian NC, SC, AL, GA, FL Eurycea tynerensis Oklahoma Salamander Amphibian OK, MO, AR Gyrinophilus palleucus Tennessee Cave Salamander Amphibian TN, AL, GA Gyrinophilus subterraneus West Virginia Spring Salamander Amphibian WV Haideotriton wallacei Georgia Blind Salamander Amphibian GA, FL (NW) Necturus lewisi Neuse River Waterdog (salamander) Amphibian NC Pseudobranchus striatus lustricolus Gulf Hammock Dwarf Siren Amphibian FL Urspelerpes brucei Patch-nosed Salamander Amphibian GA, SC Crangonyx grandimanus Florida Cave Amphipod Amphipod FL (N. and NW) Crangonyx hobbsi Hobb's Cave Amphipod Amphipod FL (N. FL) Stygobromus cooperi Cooper's Cave Amphipod Amphipod WV Stygobromus indentatus Tidewater Amphipod Amphipod NC, VA Stygobromus morrisoni Morrison's Cave Amphipod Amphipod VA Stygobromus parvus Minute Cave Amphipod Amphipod WV Cicindela marginipennis Cobblestone Tiger Beetle Beetle AL, IN, OH, NH, VT, NJ, PA Pseudanophthalmus avernus Avernus Cave Beetle Beetle VA Pseudanophthalmus cordicollis Little
    [Show full text]
  • Phylogenetic Analysis of Freshwater Crayfish of Massachusetts: the Genus Procambarus ______
    Phylogenetic Analysis of Freshwater Crayfish of Massachusetts: The genus Procambarus ______________________________________________ A Major Qualifying Project Submitted to the Faculty of WORCESTER POLYTECHNIC INSTITUTE in partial fulfillment of the requirements for the Degree of Bachelor of Science by ___________________________________ Dilbar Ibrasheva Approved by: ___________________________________ Professor Michael A. Buckholt Professor Lauren Mathews January 13, 2011 Contents Abstract ......................................................................................................................................................... 3 Acknowledgements ....................................................................................................................................... 4 1 Introduction .......................................................................................................................................... 5 2 Background ........................................................................................................................................... 7 2.1 The Species Concept ..................................................................................................................... 7 2.2 Phylogeography and Population Genetics .................................................................................... 8 3 Materials and Methods ....................................................................................................................... 13 3.1 Samples and DNA Extraction
    [Show full text]
  • Mississippi's State Wildlife Action Plan 2015 – 2025 Draft
    MISSISSIPPI’S STATE WILDLIFE ACTION PLAN 2015 – 2025 DRAFT Coordinated by the Mississippi Department of Wildlife, Fisheries, and Parks On behalf of the State of Mississippi October 2015 Mississippi Department of Wildlife, Fisheries and Parks Mission: The mission of the Mississippi Department of Wildlife, Fisheries, and Parks (MDWFP) is to conserve and enhance Mississippi’s wildlife, fisheries, and parks, provide quality outdoor recreation, and engage the public in natural resource conservation. For comments or queries regarding this strategy, please contact: Kathy Shelton [email protected] Mississippi Department of Wildlife, Fisheries, and Parks Mississippi Museum of Natural Science 2148 Riverside Drive Jackson, MS 39202 601-354-7303 www.mdwfp.com Credits: Kathy Shelton, MDWFP Mississippi State Wildlife Action Plan Coordinator Photos by the Mississippi Museum of Natural Science, except where noted. Illustrations by Sam Beibers from Endangered Species of Mississippi Maps by Ryan Theel, GIS Analyst, U.S. Fish and Wildlife Service-Ecological Services Suggested Citation Format: Mississippi Museum of Natural Science. 2015. Mississippi’s State Wildlife Action Plan, 2015-2025. Mississippi Department of Wildlife, Fisheries, and Parks, Mississippi Museum of Natural Science, Jackson, Mississippi. The MDWFP is an equal opportunity employer and provider of programs and services. If anyone believes they have been subjected to discrimination on the basis of political affiliation, race, color, national origin, marital status, sex, religion, creed, age or disability, they may file a complaint alleging discrimination with either the MDWFP, P. O. Box 451, Jackson, MS 39205-0451, or the U.S. Equal Opportunity Commission, 1801 L. Street, N.W., Washington, D.C.
    [Show full text]
  • First Records of Alien Crayfish of the Procambarus Acutus Species Complex in Belgium
    BioInvasions Records (2020) Volume 9, Issue 3: 562–569 CORRECTED PROOF Rapid Communication First records of alien crayfish of the Procambarus acutus species complex in Belgium Kevin Scheers1,2,*,+, Pieter Boets3,4,+, Thomas Abeel5 and Tom Van den Neucker2,6 1Research Institute for Nature and Forest (INBO), Havenlaan 88 bus 73, 1000 Brussels, Belgium 2Biodiversity Inventory for Conservation NPO (BINCO), Walmersumstraat 44, 3380 Glabbeek, Belgium 3Provincial Centre of Environmental Research, Godshuizenlaan 95, 9000 Ghent, Belgium 4Ghent University, Department of Animal Science and Aquatic Ecology, Coupure Links 653, 9000 Ghent, Belgium 5Odisee Campus Sint-Niklaas, Aqua-ERF, Hospitaalstraat 23, 9100 Sint-Niklaas, Belgium 6University of Antwerp, Department of Biology, Ecosystem Management Research Group, Universiteitsplein 1C, 2160 Wilrijk, Belgium + both authors contributed equally Author e-mails: [email protected] (KS), [email protected] (PB), [email protected] (TA) , [email protected] (TVDN) *Corresponding author Citation: Scheers K, Boets P, Abeel T, Van den Neucker T (2020) First records of Abstract alien crayfish of the Procambarus acutus species complex in Belgium. BioInvasions We present the first Belgian records of potentially invasive alien crayfish of the Records 9(3): 562–569, https://doi.org/10. Procambarus acutus species complex, including the first confirmed record of P. acutus 3391/bir.2020.9.3.11 acutus. The species complex was observed at four different sites in three provinces Received: 5 February 2020 in the north of the country. Only at one site the presence of a form I male specimen Accepted: 14 May 2020 made identification to species level possible, based on gonopod morphology.
    [Show full text]
  • Chattooga River Crayfish (Cambarus Scotti)
    Comprehensive Report Species - Cambarus scotti Page 1 of7 ~ NatureServe UEXPLORER Soarch About the Dat{i About Us " Contact Us Halp «Previous I Next» View Glossary Cambarus scottl- Hobbs, 1981 Coogle Chattooga River Crayfish Search for Images on Google Related ITIS Name(s): Cambarus scolfiHobbs, 1981 (TSN 97403) Unique Identifier: ELEMENT_GLOBAL,2.115192 Element Code: ICMAL07740 Informal Taxonomy: Animals, Invertebrates - Crustaceans - Crayfishes Kingdom Phylum Class Order Family Genus Animalia Crustacea Malacostraca Decapoda Cambaridae Cambarus Genus Size: D- Medium to large genus (21+ species) Check Ihis box 10 expand all reporl seclions: 0 Concept Hefercnce Concept Reference: Hobbs, Horton. H. Jr. 1989. An l!iuslrated Checklist of the American crayfishes (Decapoda: Astacidae, Cambaridae & Parastacidae). Smithsonian Contributions to Zoology 480. Smithsonian Institute Press, Washington, D. C. 236 pp. Concept Reference Code: B89HOBOI GAUS Name Used in Concept Reference: Cambarus scotti -~om;Glvalion ::>Iaiw; NaluroServe Stalus Global Sialus: G3 Global Sialus Lasl Reviewed: 01Jul2009 Global Status Last Changed: 15Jun2000 Rounded Global Slatus: G3 - Vulnerable Reasons: This species only occurs in nine iocalities along Ihe Coosa River basin (extent <5000 sq. km). II has nol been found in any other stream systems and is thought to be endemic to this river. However, there is information major threats which may be having an impact on this species, but it has been described as abundant at some sites where it occurs; especially sites where it
    [Show full text]
  • Sensitive Species That Are Not Listed Or Proposed Under the ESA Sorted By: Major Group, Subgroup, NS Sci
    Forest Service Sensitive Species that are not listed or proposed under the ESA Sorted by: Major Group, Subgroup, NS Sci. Name; Legend: Page 94 REGION 10 REGION 1 REGION 2 REGION 3 REGION 4 REGION 5 REGION 6 REGION 8 REGION 9 ALTERNATE NATURESERVE PRIMARY MAJOR SUB- U.S. N U.S. 2005 NATURESERVE SCIENTIFIC NAME SCIENTIFIC NAME(S) COMMON NAME GROUP GROUP G RANK RANK ESA C 9 Anahita punctulata Southeastern Wandering Spider Invertebrate Arachnid G4 NNR 9 Apochthonius indianensis A Pseudoscorpion Invertebrate Arachnid G1G2 N1N2 9 Apochthonius paucispinosus Dry Fork Valley Cave Invertebrate Arachnid G1 N1 Pseudoscorpion 9 Erebomaster flavescens A Cave Obligate Harvestman Invertebrate Arachnid G3G4 N3N4 9 Hesperochernes mirabilis Cave Psuedoscorpion Invertebrate Arachnid G5 N5 8 Hypochilus coylei A Cave Spider Invertebrate Arachnid G3? NNR 8 Hypochilus sheari A Lampshade Spider Invertebrate Arachnid G2G3 NNR 9 Kleptochthonius griseomanus An Indiana Cave Pseudoscorpion Invertebrate Arachnid G1 N1 8 Kleptochthonius orpheus Orpheus Cave Pseudoscorpion Invertebrate Arachnid G1 N1 9 Kleptochthonius packardi A Cave Obligate Pseudoscorpion Invertebrate Arachnid G2G3 N2N3 9 Nesticus carteri A Cave Spider Invertebrate Arachnid GNR NNR 8 Nesticus cooperi Lost Nantahala Cave Spider Invertebrate Arachnid G1 N1 8 Nesticus crosbyi A Cave Spider Invertebrate Arachnid G1? NNR 8 Nesticus mimus A Cave Spider Invertebrate Arachnid G2 NNR 8 Nesticus sheari A Cave Spider Invertebrate Arachnid G2? NNR 8 Nesticus silvanus A Cave Spider Invertebrate Arachnid G2? NNR
    [Show full text]
  • White River Crayfish Procambarusprocambarus Acutus Aacutushemimysis Acutus Acutus Anomala
    White River Crayfish www.seagrant.psu.edu ProcambarusProcambarus acutus aacutusHemimysis acutus acutus anomala The white river crayfish, also called the white river crawfish and the eastern white river crayfish, is often confused with its southern counterpart, the southern white river crayfish (Procambarus zonangulus). The eastern white river crayfish occurs naturally in the United States and is cultured eastwards from Lousiana to the Atlantic coast northward to Maine, Photo courtesy of Tony Palacios, but has established select non-native populations in locations throughout the East Coast iNaturalist.org, EOL. and in California. Species Description Adult white river crayfish are usually a dark burgundy red but can range in color from pinkish tan to brownish olive with a black “V-shaped” stripe on the abdomen. The carapace is rough and granular and is separated in the middle by a narrow space called the areola. Juveniles are gray with dark spots scattered over the carapace. The claws are long and narrow, delicate in appearance, and have small dark tubercles. This species reaches about 6-13 cm (2.5-5 in) in length. The white river crayfish is nearly impossible to distinguish from the southern white river crayfish without looking at the reproductive structures of a breeding male. It is also confused with the red swamp crayfish (P. clarkii), which have an areola that is straight, or often invisible, and a black “V-shaped” stripe on the abdomen. The juveniles are also typically plain or striped on the carapace instead of spotted. White river crayfish can also be found in streams and ditches with a stronger flow than what is preferred by the red swamp crayfish.
    [Show full text]