CLADOENDESIS OF EPHEMEROPTERA
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Fig. 47–52. Procloeon (Securiops) falcatum, larva. 47  –articulation of femur and tibia of fore leg, dorsal view; 48, the same, compressed to show junction of patella-tibial suture with row of fine hairs; 49, fragment of tarsus; 50, claw; 51, abdominal tergum X and margin of tergum IX; 52, abdominal tergum X and paraprocts.