. Fresh-water biology. Freshwater biology. Antennules long. Ceriodaphnia rotunda Sars 1862. General form much like preceding. Head angled at vertex, with spines. Antennules long and slender. Post-abdomen somewhat enlarged, but not so much as in laticaudata, tapering toward apex, obliquely truncate, with 7-9 slender anal spines. Color j'ellowish or brown, not transparent. Length, 2, to mm.; 3"-to mm. Rare, Wisconsin. Both this species and the preceding live among weeds. Fig. 1088. Ceriodaphnia rotunda. (After Lilljeburg.) 65 (49) Head large and usually extended. Antennules large an
. Fresh-water biology. Freshwater biology. Antennules long. Ceriodaphnia rotunda Sars 1862. General form much like preceding. Head angled at vertex, with spines. Antennules long and slender. Post-abdomen somewhat enlarged, but not so much as in laticaudata, tapering toward apex, obliquely truncate, with 7-9 slender anal spines. Color j'ellowish or brown, not transparent. Length, 2, to mm.; 3"-to mm. Rare, Wisconsin. Both this species and the preceding live among weeds. Fig. 1088. Ceriodaphnia rotunda. (After Lilljeburg.) 65 (49) Head large and usually extended. Antennules large and freely movable. Post-abdomen with post-anal extension. . 66 66 (67) Body compressed. Valves elliptical, crested dorsally, completely covering body. Ocellus present. Fornix and abdominal process well developed. . Moinodaphnia Herrick 1887. Cervical sinus present; no cervical gland. Valves tumid in postero-dorsal region; crested; minute spines on ventral margin; sharp angle, not spine, at junction of dorsal and ventral margins; marked with oblique striae, usually invisible in preserved specimens. Antennules attached on ventral surface of head, sense-hair about middle; olfactory setae small. One large abdominal process, broad, concave in front, somewhat saddle-shaped, forming a transition to the condition in Moina. Post-abdomen as in Moina, with slender post-anal projection bearing about 10 finely ciliate spines and a much longer distal spine with 2 unequal prongs, the bident (Fig. 1094). Claws denticulate. Summer eggs numerous. Male (South America) much like Moina, with large curved antennules. Only one certain species. Moinodaphnia madeayii (King) 1853. Color yellowish, transparent. Length, 9 » ca. r .0 mm. Louisiana. In weedy pools and lakes. Herrick's M. alabamensis is re- ported as larger ( mm.) and may possibly be a different spe- cies. Herrick had only King's very imperfect description for comparison with his form, and his own description is correspond- ingly imperfe
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
