Socotrapotamon socotrense (Hilgendorf in Taschenberg, 1883)
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publication ID |
https://doi.org/ 10.1111/j.1096-3642.2009.00625.x |
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persistent identifier |
https://treatment.plazi.org/id/03A387D4-1B14-FFC1-5049-F8A00FEB5FC6 |
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treatment provided by |
Valdenar |
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scientific name |
Socotrapotamon socotrense |
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SOCOTRAPOTAMON SOCOTRENSE View in CoL ( FIG. 1A–E, 1C; TABLE View Figure 1 2)
Socotrapotamon socotrense has the smallest acrosome size of the Potamidae (AL = 2.76 ± 0.11 Mm, AW = 1.90 ± 0.16 Mm, N = 7). The acrosome is strongly depressed (AW/AL = 0.7 ± 0.05). The centrally bulging operculum is perforate and not connected via tongue and groove to the acrosomal zones beneath. The very prominent inner acrosomal zone and the distinct acrosome ray zone bulge outwards. Apically, towards the operculum, the acrosome ray zone is covered with electron-dense material. There is an electron-lucent ring that surrounds the basal opening of the perforatorial chamber. The coenospermic spermatozoa are densely packed into spermatophores. The spermatophore wall is formed by two layers: an outer, electrondense layer, and an inner, less electron-dense layer ( Fig. 1E View Figure 1 ).
The wide inner acrosomal zone, the electron dense ‘cap’ on the acrosome ray zone, and the electronlucent ring surrounding the proximal end of the perforatorial chamber represent unique sperm characters within the Potamidae .
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