. Fresh-water biology. Freshwater biology. THE WATER FLEAS (CLADOCERA) 727 190 (187) Rostrum not bent forward IQI 191 (192) Numerous teeth along whole posterior margin. Pleuroxus truncatus (O. F. Miiller) 1785. Posterior margin with numerous (more than 20) dose- set teeth; valves striated, the striae on middle of valves nearly longitudinal, the others oblique. Post-abdo- men much hke P. trigonellus, slightly tapering toward apex, angle rounded; 12-14 marginal denticles, increas- ing in size distally. Color yellow-brown. Length, J, ca. mm.; d (European), mm. Nebraska (Fordyce). • Fi
. Fresh-water biology. Freshwater biology. THE WATER FLEAS (CLADOCERA) 727 190 (187) Rostrum not bent forward IQI 191 (192) Numerous teeth along whole posterior margin. Pleuroxus truncatus (O. F. Miiller) 1785. Posterior margin with numerous (more than 20) dose- set teeth; valves striated, the striae on middle of valves nearly longitudinal, the others oblique. Post-abdo- men much hke P. trigonellus, slightly tapering toward apex, angle rounded; 12-14 marginal denticles, increas- ing in size distally. Color yellow-brown. Length, J, ca. mm.; d (European), mm. Nebraska (Fordyce). • Fig. 1138. Pleuroxus truncatus. (European specimen.) 192 (191) Teeth at infero-posteal angle only . 193 193 (196) Post-abdomen long, slender, convex on ventral (upper) side. 194 194 (195) Supero-posteal angle sharp but not projecting; infero-posteal angle a sharp point. . Pleuroxus hastatus Sars 1862. Infero-posteal angle a sharp point, with a very small tooth; valves reticulated, longitudinal marks often more distinct, giving appearance of striation. 16-18 marginal denticles. Color yellow, transparent or opaque; not black unless ephippial. Length, 9, ca. mm.; j, ca. mm. Rather rare; New England, Wisconsin, Nebraska, California. Fro. 1139. Pleuroxus 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
