Home Acknowledgments Conventions Glossary Maps References Links Articles Thumbnails Species list Main page Next photo	Siphopteron quadrispinosum Gosliner, 1989   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.   mating, underside shows flipped, mating pair (illustrating curvature of foot) Photos:  John Horn: Hanalei Bay, Kauai; July 17, 2022.
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