Ionella compressa (Shiino 1964) n. comb.

Pseudione compressa Shiino, 1964b: 240 –242, fig.2 (Honohoshi, Amamiooshima, Japan, infesting Neocallichirus jousseaumei (Nobili, 1904)) .— Bourdon, 1968: 150, 172 (mention).— Danforth, 1970a: 29 (mention).— Page, 1985: 198 (mention).— Saito et al., 2000: 37 (list).— Markham, 2001: 198, 200 (list).— Itani, 2004b: 37 –38, table 3 (Japan, infesting Paratrypaea bouvieri (Nobili, 1904)) .

Not Pseudione compressa — Shiino, 1972: 7 (Japan, infesting Heterocarpus sibogae de Man, 1917) (= Pseudione magna Shiino, 1951 fide Markham, 2010: 158).

Material examined. None.

Distribution. Japan.

Host. Neocallichirus jousseaumei (Nobili, 1904) (type host) and Paratrypaea bouvieri (Nobili, 1904) .

Remarks. The males and females of this species appear very similar to those of Ionella murchisoni Danforth, 1970 and Danforth (1970a) actually compared and contrasted the two species although he did not transfer P. compressa to Ionella . Based on Shiino’s (1964b) description and figures, we herein transfer P. compressa to Ionella . Examination of specimens, ideally from the vicinity of the type locality, is needed to confirm details of the morphology and to determine the relationship of I. compressa to other species of Ionella .