Fig 2.

Scanning electron miscropy analysis of D. immitis microfilaria, pre-sausage, sausage, and late sausage stages. a Microfilaria mounted on a double-sided tape showing whole parasite (left), enlarged head region (middle), ventral anterior view (right). b Pre-sausage stage larvae mounted on a 3.0-µm polycarbonate membrane filter showing whole parasites (left), enlarged head region (middle and right). c Sausage stage larvae mounted on a 3.0-µm polycarbonate membrane filter showing whole parasite (left) and enlarged head region (middle and right). d Late sausage stage larvae mounted on a 3.0-µm polycarbonate membrane filter, showing whole parasite (left and middle) and enlarged region (right). Red arrows show where the stoma opening would be