. Fresh-water biology. Freshwater biology. THE WATER FLEAS (CLADOCERA)' 689 KEY TO NORTH AMERICAN FRESH-WATER CLADOCERA I (248) Body and feet covered by a bivalve shell. Feet in general foliaceous, not plainly jointed. . Section A. Calyptomera . a 2 (21) Six pairs of feet, all similar, except the last, and all foliaceous. Tribe I. Ctenopoda . 3 3 (18) Shell of ordinary type. Antenna biramous in female, rami flattened, the dorsal with numerous setae, both lateral and terminal. Family SroroAE Baird . 4 Head large; cervical sinus present. Antennules large, movable. Antennae with terminal setae on
. Fresh-water biology. Freshwater biology. THE WATER FLEAS (CLADOCERA)' 689 KEY TO NORTH AMERICAN FRESH-WATER CLADOCERA I (248) Body and feet covered by a bivalve shell. Feet in general foliaceous, not plainly jointed. . Section A. Calyptomera . a 2 (21) Six pairs of feet, all similar, except the last, and all foliaceous. Tribe I. Ctenopoda . 3 3 (18) Shell of ordinary type. Antenna biramous in female, rami flattened, the dorsal with numerous setae, both lateral and terminal. Family SroroAE Baird . 4 Head large; cervical sinus present. Antennules large, movable. Antennae with terminal setae only on ventral ramus. Eye large, with numerous lenses; ocellus small or absent. Intes- tine simple, usually with more or less distinct median cecum or enlargement at anterior end; rarely with 2 hepatic ceca. Heart elongated. Male usually with characteristic antennule; the flagellum united with the base into one structure, long, tapering, with a row of fine spinules toward apex; usually with grasping organ on first foot and copulatory organs on post-abdomen. 4 (s) Dorsal ramus of antenna 3-jointed, rostrum present. Sida Straus 1820. Head with large gland on dorsal side; pointed rostrum; no fornices. Antennules of $ attached to side of rostrum, short, truncate, with short flagellum. Ventral ramus of antennae 2-jointed. Antennules of $ very long; no copulatory organ; first foot with hook. Only one American species. . Sida crystallina {O. F-MMlei) lyS^.. 31" ^V:,-^L^-*''*. ' "^ ;^-5^»'€f^ft?^^s^^^). 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: 1903px × 1313px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
