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Siphopteron quadrispinosum Gosliner, 1989
 
Siphopteron quadrispinosum: mating

Siphopteron quadrispinosum: mating
mating
The penis of the upper animal is inserted into the gonopore of the lower animal while its penile stylets are hypodermically inserted into the foot (hence, it's bipartite appearance in the upper photo). Meanwhile, the penis and penile stylets of the lower animal are reciprocally inserted into the gonopore and foot of the upper animal (with the stylets more clearly visible in the second photo).

Photos:
  Rich Neely: south of Kona, Big Island; Nov. 29, 2020.

Siphopteron quadrispinosum: mating, underside
 
mating, underside
shows flipped, mating pair (illustrating curvature of foot)

Photos:  John Horn: Hanalei Bay, Kauai; July 17, 2022.

Siphopteron quadrispinosum: mating, underside
 
mating, front
shows mating pair from front (for right animal)

Photos:  David Prutow: Ho'okena, Big Island; May 23, 2024.
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