. Fresh-water biology. Freshwater biology. Ceriodaphnia rigaudi Richard 1894. Valves reticulated. Head produced in front of antennules into a short, conical, sharp-pointed, hornlike process. Two abdominal proc- esses. Post-abdomen with 5-6 anal spines. Claws smooth or den- ticulate. Antennules rather slender; lateral sense-hair somewhat distal to middle. Length of 9, ,5 mm.; d (South American), mm. Pools; Louisiana, Texas. The form with horn on vertex also is found in South America, mingled with typical C. rigaudi. Probably both forms should be in- cluded in C. cornuta Sars. Fig. 107
. Fresh-water biology. Freshwater biology. Ceriodaphnia rigaudi Richard 1894. Valves reticulated. Head produced in front of antennules into a short, conical, sharp-pointed, hornlike process. Two abdominal proc- esses. Post-abdomen with 5-6 anal spines. Claws smooth or den- ticulate. Antennules rather slender; lateral sense-hair somewhat distal to middle. Length of 9, ,5 mm.; d (South American), mm. Pools; Louisiana, Texas. The form with horn on vertex also is found in South America, mingled with typical C. rigaudi. Probably both forms should be in- cluded in C. cornuta Sars. Fig. 1078. Ceriodaphnia rigaudi. Si (50) Head without horn 52 52 (53) Claws Ceriodaphnia reticulata (Jurine) 1820. Head obtusely, or not at all, angu- lated in front of antennules. Valves reticulated, ending in spine or angle. Antennules small, with sense-hair near apex. Anal spines 7-10. Claws with pecten of 6-10 teeth and denticulate. Color variable, shades of red and yel- low. Length of J, mm.; of (J, mm. Common, widely distributed. Fig. 1079. Ceriodaphnia reticulata, with ephippium. 53 (52) Claws not pectinate. 54. 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. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
