. Fresh-water biology. Freshwater biology. Fig. 1124. Euryalona occidentalis Sars. cercus. Five pairs of feet; hook on first foot of 9. upper (ventral) side of post-abdomen about middle, mm.; $ mm. Florida, Louisiana, Texas; not uncommon in weedy pools and lakes. ^3S (123) Body not greatly compressed; claws with i basal spine, or rarely none. 136 For all species with two spines on terminal claw, see 171 ft. 136 (168) Rostrum not greatly exceeding antennules 137 137 (167) Rostrum pointed. . 138 138 (150) Infero-posteal angle rounded, without teeth 139 139 (144, 147) Post-abdomen with ma
. Fresh-water biology. Freshwater biology. Fig. 1124. Euryalona occidentalis Sars. cercus. Five pairs of feet; hook on first foot of 9. upper (ventral) side of post-abdomen about middle, mm.; $ mm. Florida, Louisiana, Texas; not uncommon in weedy pools and lakes. ^3S (123) Body not greatly compressed; claws with i basal spine, or rarely none. 136 For all species with two spines on terminal claw, see 171 ft. 136 (168) Rostrum not greatly exceeding antennules 137 137 (167) Rostrum pointed. . 138 138 (150) Infero-posteal angle rounded, without teeth 139 139 (144, 147) Post-abdomen with marginal and lateral denticles. 140 140 (143) Post-abdomen relatively long and narrow; marginal denticles numerous, longer distally. Basal spine stout and long. Oxyurella Dybowski and Grochowski 1894 . 141 In general like Alona. Post-abdomen long, slender; with marginal and lateral denticles, the former numerous and ending in a group of large denticles at angle of post-abdomen. Termi- nal claw straight, with one large basal spine, attached some way distal to base of claw. Color yellow or yellow-brown. This genus is the same as Odontalona Birge. 141(142) 12-is marginal Oxyurella tenuicaudis (Sars) 1862. Marginal denticles very small near anus; the distal 4-5 much larger; the penulti- mate largest. Length, J, ca. mm.; $, mm. Widely distributed but not abimdant anywhere. New England and Wisconsin to Gulf of Mexico. This species is Alona te"uicaudis Sars. Fig. 1125. Oxyurella tenuicaudis. Apex of post-abdomen. (See also Fig. 1129, i.). 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
