I recently found a research document that reveals that in Okinawa japan on the Iriomotejiima island 2 out of 100 male Coenobita rugosus collected had male and female sex organs. This means they have gonopores on both the 3rd set of pereopods and on the 5th set as well. Coenobita brevimanus and Coenobita purpureus were collected and observed as well but no intersex specimens were observed.
Observation of intersexuality in land hermit crabs (Anomura: Coenobitidae)
Oleg Gusev a1a2c1 and Yaroslav Zabotin a1
a1 Department of Invertebrate Zoology, Kazan State University, 17 Kremlevskaya str., 420008, Kazan, Russia
a2 Department of Biology, Faculty of Science, Okayama University, 3-1-1 Tsushima, 700-8530, Okayama, Japan