Figure 13
From: Structural aspects of leg-to-gonopod metamorphosis in male helminthomorph millipedes (Diplopoda)
O. gracilis male sections. Para-midsagittal (A-D, G-H), frontal (E) and transverse (F) paraffin sections of ring VII during stadia IV-VIII. Mallory's triple stain. (A) Stadium IV. (B) Stadium V. (C) Stadium VI. (D) Stadium VII. (E-H) Stadium VIII. gA, gonopod apodeme; ga, gonopod abductor muscle; gp, gonopod protractor muscle; gr, gonopod retractor muscle; gt, gut; mf, muscle fiber; nc, nerve cord; pe, prefemur extensor muscle; sa, solenomerite abductor muscle; tA, tracheal pouch apodeme; arrowheads, possibly undifferentiated tissue. Anterior to the left, scale bars 200 μm.