. Fresh-water biology. Freshwater biology. 24s (244) Post-abdomen short; rounded at apex; valves without fine striae. Alonella exigua (LiUjeborg) 1853. Much like preceding species but smaller. About 6-8 small marginal denticles. Color yellow, not very transparent. Length, 9, mm.; J, mm. Maine, Wisconsin, Michigan; rare. Fig. Z166. Alonella exigua. 246 (121) Eye and ocellus very large; antennules project far beyond rostrum. Dadaya Sars 1901. Sole species Dadaya macrops (Daday) 1898. Form rounded-oval; not compressed. Head small, much depressed; tumid above eye; ros- trum short
. Fresh-water biology. Freshwater biology. 24s (244) Post-abdomen short; rounded at apex; valves without fine striae. Alonella exigua (LiUjeborg) 1853. Much like preceding species but smaller. About 6-8 small marginal denticles. Color yellow, not very transparent. Length, 9, mm.; J, mm. Maine, Wisconsin, Michigan; rare. Fig. Z166. Alonella exigua. 246 (121) Eye and ocellus very large; antennules project far beyond rostrum. Dadaya Sars 1901. Sole species Dadaya macrops (Daday) 1898. Form rounded-oval; not compressed. Head small, much depressed; tumid above eye; ros- trum short and broad. Antennules long, mod- erately stout, projecting far beyond rostrum. Post-abdomen of moderate size, compressed, somewhat broadened behind anus, slightly narrowing toward apex; angle rounded; about 14-18 marginal denticles. Claws small, one small basal spine. Eye very large, with few lenses; ocellus nearly as large, crowded down into rostrum. $ unknown. Color dark brown. Length, 9 > ca- °-3 '"'n- A single specimen of this species was found in a collection from a weedy pool at Smith- ville, Texas. Fig. 1167. Dadaya 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: 1251px × 1996px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
