. Fresh-water biology. Freshwater biology. Fig, 1151. Chydorus sphaericus. 222 (221) Fornices abruptly narrowed into rostrum. Two olfactory setae on side of antennule. . Chydorus piger Sars 1862. General form much like C. sphaericus. Ventral margin of valves densely ciliated; valves ordinarily marked by oblique striae, sometimes smooth. Fornices abruptly narrowed at rostrum. Antennule with usual lateral sense seta and two olfactory setae on side. Post-abdomen with 8-9 rather long marginal denticles. Claws with 2 basal spines, the proximal one minute. J post-abdomen narrow, but not excavated. C
. Fresh-water biology. Freshwater biology. Fig, 1151. Chydorus sphaericus. 222 (221) Fornices abruptly narrowed into rostrum. Two olfactory setae on side of antennule. . Chydorus piger Sars 1862. General form much like C. sphaericus. Ventral margin of valves densely ciliated; valves ordinarily marked by oblique striae, sometimes smooth. Fornices abruptly narrowed at rostrum. Antennule with usual lateral sense seta and two olfactory setae on side. Post-abdomen with 8-9 rather long marginal denticles. Claws with 2 basal spines, the proximal one minute. J post-abdomen narrow, but not excavated. Color light to dark yellow. Length, 9 > '^- °'4 mm. Rare; reported only from Maine. i-. MM Fig. IIS2. Chydorus piger. Entire specimen and 16wer side of rostrum with antennules, 223 (220, 224) Larger forms, to mm. Antennules short and thick with all olfactory setae terminal. . Chydorus latus Sars 1862. Much like sphaericus, but larger. Mandible attached some way back of junction of head and valve. Denti- cles of post-abdomen 10-12. Claws sometimes with only I basal spine. Color dark yellow-brown. Length, 9. to mm. Rare; Canada, near Lake Erie. FtG. 1153. Chydorus Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
Size: 1936px × 1291px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
