. Bollettino. Storia naturale; storia naturale. Agosto 1985 Astaci e gamberetti di Illinois 435 ;-..^:^i*s^: -^^^2"^^'.::^^^:-:^^. ^^P^ * * lj.^^ Fig. 170.-camino-sormontato burrows del Cambarus diogenes sulla pianura alluvionale di slough, 2 MI N piacevole Grove. Johnson County, Illinois (9 luglio 1972). rosso marrone (con torace rosso leggero) a verde con red outHning segmenti addominali, suggerimenti di chele e i margini del rostro. Marlow (1960) ha esaminato la variazione geografica in C. diogene e ha concluso che solo due sottospecie potrebbe essere rec- ognized: C. d. ludovicianus nel lago Ponchartrain drenaggio e così

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. Bulletin. Natural history; Natural history. August 1985 Crayfishes and Shrimps of Illinois 435 ;-..^:^i*s^: -^^^2^"^'.::^^^:-:^^. ^^P^**lj.^^ Fig. 170.—Chimney-topped burrows of Cambarus diogenes on the floodplain of a slough, 2 mi N Pleasant Grove. Johnson County, Illinois (9 July 1972). red brown (with thorax lighter red) to green with red outHning abdominal segments, tips of chelae, and margins of rostrum. Marlow (1960) examined geographic variation in C. diogenes and concluded that only two subspecies could be rec- ognized: C. d. ludovicianus in the Lake Ponchartrain drainage and southern Louisiana and C. d. diogenes through- out the rest of the range of the species. However, according to Hobbs (1969, 1974b), C. diogenes is a complex of forms, and C. d. ludovicianus probably is more widespread than Marlow thought. Illinois specimens show tre- mendous variation in the shape of the carapace and rostrum and in coloration. If several taxa presently are included in "C. diogenes." more than one may be found in Illinois. The only other de- scribed species in the subgenus Lacuni- cambarus are C. acanthura, restricted to the Tennessee and Alabama drain- ages of Tennessee, Alabama, and (ieoi- gia (Hobbs 1981) and C miltus from Baldwin Clounty, Alabama (Filzpatritk 1978b). Dislribulion and Habitat.—C. diog- enes ranges along the Atlantic Pied- mont and Coastal Plain from New Jersey and Pennsylvania south to cen- tral Georgia, in Gulf drainages from Georgia to eastern Texas, and north in the Mississippi and Great Lakes basins to western New York and Penn- sylvania, Michigan, Wisconsin, Min- nesota, and North Dakota. The western- most populations occur in the Platte Rier drainage of Colorado and Wy- oming (Fig. 168). C. diogenes occurs statewide in Il- linois (Fig. 169) and is generally com- mon. It is abundant in the Shawnee Hills and on the Coastal Plain of south- ern Illinois, less common in northern and western Illinois. Its burrowing habits preclud

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• bookcentury1900
• bookdecade1910
• booksubjectnaturalhistory
• prenota un