A fact from Gastropteridae appeared on Wikipedia's Main Page in the Did you know column on 4 October 2017 (check views). The text of the entry was as follows:
Did you know... that while mating, some species of bat-winged slugs(pictured) stab each other with a two-pronged penis?
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Taxonomy: For all marine species, Project Gastropods uses the taxonomy in the online database WoRMS. When starting a new article, do not use sources of taxonomic information that predate the 2017 revision for all gastropod groups ("Revised Classification, Nomenclator and Typification of Gastropod and Monoplacophoran Families" by Philippe Bouchet & Jean-Pierre Rocroi, Bernhard Hausdorf, Andrzej Kaim, Yasunori Kano, Alexander Nützel, Pavel Parkhaev, Michael Schrödl and Ellen E. Strong in Malacologia, 2017, 61(1–2): 1–526.) (can be dowloaded at Researchgate.net), substituting the previous classification of 2005 Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005). If you need help with any aspect of an article, please leave a note at the Project talk page.
Is this species' mating an example of traumatic insemination, or is the spiking simply an effort to hold onto the other individual? The text isn't quite clear on that point. --Piledhigheranddeeper (talk) 02:08, 5 October 2017 (UTC)[reply]
It's an example of traumatic insemination I think, but the source did state that it was prostate fluid that was injected, and I assume that this contains sperm. Cwmhiraeth (talk) 08:16, 5 October 2017 (UTC)[reply]
