Fig. 3
From: Recent advances on Dirofilaria repens in dogs and humans in Europe
Developmental stages of Dirofilaria repens inside a mosquito (Aedes vexans) (courtesy of Cornelia Silaghi). a L1 day 2 pi; 335 × 9 μm, the stage still resembling a microfilaria. b L1 day 3 pI; 167 (214) × 18 μm, so-called sausage stage. c L1 day 5 pi; 198 (220) × 16.8 μm, so-called sausage stage, but more elongated. d L2 day 7 pi; 425 × 35 μm. e L2 late stage or L3 inside Malpighian tubules (black arrows), day 19 pi. f L3 day 16 pi, transition from thorax to head; 962 × 30 and 934 × 23 μm