Further Notes on Phyllosoma Utivaebi Tokioka

With 4 Text-figuresOn the morning of May 2nd, 1963, sixteen specimens of giant phyllosomas were found stranded on the sandy beach between the north shore of the laboratory and Ezura, a small fishing village about 1 km east of the Laboratory, by Takasi ToKrOKA, Jr., who was walking there with his dog.He picked those up and brought them back to the senior author.They were completely dried up, looked like cellophane works and were very fragile.They were soaked in the warm solution of sodium phosphate, washed with fresh water carefully and preserved in alcohol for examination.Fifteen of these specimens (Stage UL), 28 mm to 33 mm in carapace length, conform quite well in every detail to the two larger specimens (Nos. 1 and 2) of Phyllosoma utivaebi described by the senior author in 1954.A pair of longitudinal crests on carapace are furnished each with 9-13 serrations, most frequently 10-11.The outer distal end of the second segment of antenna bears 4 to 7, most frequently 5-6, teeth, besides none to six minute spinules occurring and distributing rather irregularly (Table 1 and Text-fig.1).The marginal teeth usually diminish the size posteriorly ; especially rear one to three may be very small in some specimens.Of five pereiopods, the figure and the description were given insufficiently and incorrectly only on the fourth pair in 1954.Actually, however, the appearance of the fifth segment differs conspicuously according to the order of these appendages (Text-fig.2).There are a pair of long stout setae at the ventral side of the distal edge as the proximal portion of dactylus is embraced between these setae.The segment is armed heavily with setae; on the first pereiopod these are arranged on the ventral side of the distal half in annuli which are up to ten ----~--------- • ---------------------1) Contributions from the Seto Marine Biological Laboratory, No. 409.