Hypothesis: The Long Spermatozoa in Ostracods and Drosophila are Caused by Gravitational Forces comparable to Spaghettification (Spermatozoa Spaghettification in Ostracods and Drosophila by Gravitational Forces)

Hypothesis: The long spermatozoa in ostracods and drosophila are caused by gravitational forces comparable to spaghettification near black holes.

(Spermatozoa spaghettification in ostracods and drosophila by tidal gravitational forces)

by Stefan Geier, Haidholzen

Spaghettification, or the “noodle effect,” is the extreme vertical stretching (and horizontal compression) of objects into long, thin shapes due to intense tidal gravitational forces near a black hole. We would like to introduce, in the context of GEIER’s equations, the hypothesis that the extremely long spermatozoa of some species (e.g., ostracods, up to 5 cm; Drosophila, up to 6 cm) are also related to gravitation.

Hypothesis: The long spermatozoa in ostracods and drosophila are caused by gravitational forces comparable to spaghettification near black holes.

References:

· Geier Stefan et al. Sperm cell radii and GEIER's r(KKCYMF): all our literature-derived sperm-cell radius records pass the r(KKCYMF) or d(G) benchmark (Sperm Cell Radii and rKKCYMF = dG/2, Part 2) ResearchGate, 2. May 2026, DOI: 10.13140/RG.2.2.25575.61609.
· Hawking Stephen: A Brief History of time. Bantam Dell Publishing Group (1988).
· Jia, Ye-Lin et al. Normal sperm head morphometric reference values in fertile Asian males. Asian J. Androl. 26, 315-320 (2024).
· Matzke-Karasz, Renate Giant spermatozoon coiled in small egg: fertilization mechanisms and their implications for evolutionary studies on Ostracoda. J. Exp. Zool. B Mol. Dev. Evol. 304B, 129-149 (2005).
· Matzke-Karasz, Renate. et al. Sexual intercourse involving giant sperm in Cretaceous ostracode. Science 324, 1535 (2009).
· Matzke-Karasz, Renate et al. Exceptional preservation of reproductive organs and giant sperm in Cretaceous ostracods. Proc. R. Soc. B 287, 20201661 (2020).
· Smith, R. J., Matzke-Karasz, R., Kamiya, T. & De Deckker, P. Sperm lengths of non-marine cypridoidean ostracods (Crustacea). Acta Zool. 97, 1-17 (2016).
· Smith, R. J., Matzke-Karasz, R. & Kamiya, T. Sperm length variations in five species of cypridoidean non-marine ostracods (Crustacea). Cell Tissue Res. 366, 483-497 (2016).

Yours sincerly,
Stefan Geier
Gerhart-Hauptmann-Str.6
83071 Haidholzen, Germany