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TAB-12 <br />SITIES (N0./FTC) AND PERCENT RELATIVE ABUNDANCES (%RA) OF BENTIIIC MACROINVERTEBRATES COLLECTED BY <br />SURBER SAPIPLER AT STATION 3 IN TIUi WILLIAMS FORK RIVER NEAR CRAIG, COLORADO <br />NOVEMBER 19, 1981 <br />Taxa Rep 1 Rep 2 Rep 3 Rep 4 Plean %RA S.D. <br />Gascropoda <br />Physidae <br />Physa sp. 2 0.5 0.1 1.0 <br />Ephemerellidae <br />Baetidae <br />Baetis sp. 746 165 328 ]66 20].3 23.2 85.0 <br />Ephemeridae <br />Ephemera sp. 1 0.2 <0.1 0.5 <br />a <br />Ephemerellidae <br />Ephemerella sp. 40 31 51 49 42.7 4.9 9.2 <br />Heptageniidae <br />Heptagenia sp. 1 1 0.5 0.1 0.6 <br />Rithrogena sp. 25 2 2 7.3 0.8 11.9 <br />Leptophlebiidae <br />Paraleptophlebia sp. 6 1 l.7 0.2 2.8 <br />Tricorythidae <br />Tricorythodes sp. 41 175 63 286 ]41.3 16.3 112.9 <br />Odonata <br />Gomphidae <br />Ophiogomphus severus 1 1 0.5 0.1 0.6 <br />Plecoptera <br />Perlidae <br />Isoperla sp. 4 2 ]2 17 8.7 1.D 7.0 <br />Taeniopterygidae <br />Taenionema sp. 24 8 3 6 10.3 1.2 9.4 <br />