Fig. 21
From: Evolutionary morphology of sperm in pholcid spiders (Pholcidae, Synspermiata)
Spermiogenesis of Pholcophora spp. TEM. A Pholcophora sp. n. ‘Mex157’. Early spermatids are fused during spermiogenesis. B Pholcophora sp. n. ‘Mex22’. Mid spermatid. Note the pointy triangular appearance of the nucleus. C Pholcophora sp. n. ‘Mex157’. Mid to late spermatid. Note the position of the AF in the periphery of the nucleus and the cylindrical AV. D Pholcophora sp. n. ‘Mex22’. Late spermatids still remain fused and separate before the coiling process to ultimately form cleistospermia