Stenoonops peckorum Platnick

Lipke, Elisabeth & Michalik, Peter, 2015, Evolutionary Morphology Of The Primary Male Reproductive System And Spermatozoa Of Goblin Spiders (Oonopidae; Araneae), Bulletin of the American Museum of Natural History 2015 (396), pp. 1-72 : 50-51

Stenoonops peckorum Platnick and Dupérre´, 2010

SPERM TRANSFER FORM ( fig. 39 ): Synspermia ( fig. 39G ); refers to data obtained from sperm conjugates in the lumen of the testis, because the deferent ducts were empty. The number of sperm that are fused within synspermia is uncertain.

SPERMATOZOA ( fig. 39 ): Acrosomal complex: AV cylindrical, narrow subacrosomal space ( fig. 39E ). AF originates from the subacrosomal space and extends into the nuclear canal ( fig. 39B, F ) but clearly ends before the axonemal base ( fig. 39E ). Nucleus: prcN extremely elongated and tubelike ( fig. 39D ). The chromatin is homogeneously condensed, the surface appears smooth ( fig. 39D, F ). IF very small, comprising only the two centrioles. peN very short, thin, and flag shaped ( fig. 39E ). NC located in the periphery ( fig. 39F ). Axoneme: 9+3 microtubular pattern ( fig. 39E ).

NOTES ON SPERMIOGENESIS ( fig. 39 ): Within the testis, cysts of developing spermatids of different developmental stages occur. In early spermatids the chromatin starts condensation in the center of the developing nucleus ( fig. 39A ). A manchette of microtubules surrounds the nucleus ( fig. 39B ) and parts of the Ax. It appears fibrillar in mid spermatids ( fig. 39C ). The nucleus enormously elongates in midspermatids and finally becomes tubelike in late spermatids ( fig. 39D ). At the end of spermiogenesis the main sperm cell components coil within the cell ( fig. 39G ).

Figures

Fig. 39. Characteristics of sperm and spermiogenesis of Stenoonops peckorum. A: The chromatin condenses irregularly in developing spermatids and appears fibrillar. B: A single-layered manchette of microtubules surrounds the nucleus. C: The IF is very small and contains only the two centrioles. D: During further development, the nucleus extremely elongates. E: The short peN is thin and flag shaped. F: The AF, which originates from the subacrosomal space, clearly ends before the base of the axoneme. G: At the end of spermiogenesis, the main sperm cell components coil.