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The authors show that the vector tissue in four species of leeches is composed of a mass of cells located directly beneath the copulatory area, and two thin strands extend toward the ovaries.
The authors studied morphological and ultrastructural features of the salivary glands and proboscises of Placobdella ornata, Placobdella parasitica, and Desserobdella picta by light and electron microscopy.
Exercise from Invertebrate Anatomy OnLine covering the systematics, natural history, external and internal anatomy and behavior of this leech and another leech, Hirudo medicinalis.
The authors state that Piscicola geometra (L.), Piscicola respirans Troschel, 1850, and Caspiobdella fadejewi (Epshtein, 1968) find their hosts (fishes) by reacting to their shadow.