Aspetti ultrastrutturali del testicolo in larve di Lithobius forficatus L.
The ultrastructure of the testis of the chilopod Lithobins forficatus L. during the fifth larval stage has been studied. The testis wall is constituted of an epithelial layer, a thin basement membrane, two concentric muscle layers, a sheet of extremely interdigitated epithelial cells. The testis lumen is filled with spermatogonia and spermatocytes. The muscle fibers contain a single nucleus; the contractile elements present a peculiar organization: the number of actin filaments at I band level,...