. Fresh-water biology. Freshwater biology. COPEPODA 777 87 (88) Setae of fifth feet very elongate, last antennal segment armed with serrate hyaline plate; common. Cyclops leuckarti Claus 1^857. This species is easily recognized from tlie form of the furcae. No other species with seventeen segmented antennae has this characteristic form of short rami, with the lateral setae placed at about midway of its length. If one can make out the structure of the fifth feet (Fig. 1221), he can be quite sure of the identification; for no other American species has this form, with the excep- tion of tenuis,
. Fresh-water biology. Freshwater biology. COPEPODA 777 87 (88) Setae of fifth feet very elongate, last antennal segment armed with serrate hyaline plate; common. Cyclops leuckarti Claus 1^857. This species is easily recognized from tlie form of the furcae. No other species with seventeen segmented antennae has this characteristic form of short rami, with the lateral setae placed at about midway of its length. If one can make out the structure of the fifth feet (Fig. 1221), he can be quite sure of the identification; for no other American species has this form, with the excep- tion of tenuis, and, so far, tenuis has been found in only one locality. This species, as has been noted in another place, is peculiarly interesting; for it is almost world-wide in its distribution, having been found in all continents. Moreover, the Uttle variations which are found in details of structure are also world-wide, so that change of location leuckarti. A, abdomen seems to have no effect on the species. B, fifth foot of same. Length of female, 88 (87) Setae of fifth feet of moderate length, last antennal segment with- out hyaline plate Cyclops tenuis Marsh 1910. It has been found in Arizona and in the Isthmus of Panama. Length of female, i. i mm. Fig. 1222. Fifth foot of Cyclops tenuis. X 272. (Original.) 89 (81, 84) Second segment of fifth feet armed with three setae 90 90 (91) With sensory club on twelfth antennal segment, hyaline plate of seventeenth antennal segment smooth or serrate, egg sacs standing out from abdomen. Cyclops albidus Jurine 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
