Fig. 3From: Practical guide for microscopic identification of infectious gastrointestinal nematode larvae in sheep from Sardinia, Italy, backed by molecular analysisDecision tree for the microscopic identification of the infectious larvae of the common ovine gastrointestinal nematodes (GIN). a Preliminary classification based on sheathed tail length, b secondary classification (within each respective sheathed tail group: A, B, C) based on additional morphological and morphometric characteristics. *Approximative proportion of the sheathed tail that is filamentous [13]Back to article page