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The Subspecies of Cambarus diogenes

Guy Marlow
The American Midland Naturalist
Vol. 64, No. 1 (Jul., 1960), pp. 229-250
Published by: University of Notre Dame
DOI: 10.2307/2422905
Stable URL: http://www.jstor.org/stable/2422905
Page Count: 22
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The Subspecies of Cambarus diogenes
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Abstract

Color patterns for Cambarus diogenes diogenes are twofold: (1) a general dark colored crawfish or olive-green on the dorsal surface, a cream colored ventral surface, red-tipped chelae, and (2) a striped phase with three longitudinal light red abdominal stripes, and essentially the same color pattern as (1) above. Wide variation occurs. The color pattern for C. d. ludovicianus is diagnostic for the subspecies, being brilliant blue with three red longitudinal abdominal stripes, best seen in the juveniles. Adult color is somewhat less brilliant. Subspecies differentiation between C. d. diogenes and C. d. ludovicianus is made on the following bases: (1) color patterns; (2) range; (3) cephalic portion of cephalothorax length/areola length ratio of C. d. diogenes being 1.44, never ranging below 1.40 and that of C. d. ludovicianus, 1.24, never ranging above 1.30; (4) the annulus ventralis of the female C. d. diogenes is 1.4 times as wide as long while that of C. d. ludovicianus is 1:1; (5) antennal scale length/width of C. d. diogenes is less than 1.45, while that of C. d. ludovicianus is more than 1.45. All C. d. diogenes in the United States show essentially the same ratios as given above. This is borne out statistically, except for a small number in Wells Co., Indiana, where the ratio approaches that of C. d. ludovicianus but is higher. No explanation is given for this situation. Ontogenetic variation has been shown to occur for both subspecies, with the cephalic portion of the cephalothorax length/areola length ratio gradually decreasing from juveniles to adults. Intra-sample specimens, although in large series, have little statistical value in the investigation of subspeciation of C. d. diogenes, as shown in large samples from Mississippi. The range of C. d. ludovicianus is limited to the Alluvial Fault Basin in Louisiana. No other specimens have been found in the United States to compare in cephalic portion of the cephalothorax length/areola length ratio and color pattern of this subspecies. Statistical values based on morphological features are advocated by the author for subspeciation differences within this group of crawfish.

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