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Althaus, Sarah; Jacob, Alain; Graber, Werner; Hofer, Deborah; Nentwig, Wolfgang; Kropf, Christian (2010). A double role of sperm in scorpions: the mating plug of Euscorpius italicus (Scorpiones: Euscorpiidae) consists of sperm. Journal of morphology, 271(4), pp. 383-93. Philadelphia, Pa.: Wistar Institute of Anatomy and Biology 10.1002/jmor.10804
Burger, Matthias; Graber, Werner; Michalik, Peter; Kropf, Christian (2006). Silhouettella loricatula (Arachnida, Araneae, Oonopidae): a Haplogyne spider with complex female genitalia. Journal of morphology, 267(6), pp. 663-77. Philadelphia, Pa.: Wistar Institute of Anatomy and Biology 10.1002/jmor.10435
Burger, Matthias; Michalik, Peter; Graber, Werner; Jacob, Alain; Nentwig, Wolfgang; Kropf, Christian (2006). Complex genital system of a haplogyne spider (Arachnida, Araneae, Tetrablemmidae) indicates internal fertilization and full female control over transferred sperm. Journal of morphology, 267(2), pp. 166-186. Philadelphia, Pa.: Wistar Institute of Anatomy and Biology 10.1002/jmor.10394
