Bulletin of the Shikoku Institute of Natural History NO.９
The porcellanid crabs Polyonyx sinensis and P. utinomii were collected from tidal flats in Uranouchi Inlet, Kochi Prefecture, Japan. The crabs were collected from the tubes of the chaetopterid polychaetes; P. sinensis was symbiotic with Mesochaetopterus japonicus and P.utinomii with Chaetopterus cautus.
In 2015, a single living specimen and 17 freshly dead-shells of the psammobiid clam,Soletellina adamsii, were collected from Uranouchi Inlet, Tosa Bay, Kochi Prefecture, Japan. This clam has been designated as one of the vulnerable species both by the Ministry of the Environment and by the Japanese Association of Benthology. The locality was a small intertidal sand flat near the mouth of the Izumi River, on the northern coast of the Inlet. Allometric growh of the shell was examined for the first time for this species