Pylopaguropsis fimbriata McLaughlin & Haig, 1989

(Fig. 3B)

Pylopaguropsis fimbriata McLaughlin & Haig, 1989: 164, figs. 1f, l, 2f, 4d, 6d, 8e, 10d, 12d, 13i (type locality: Guam Island, Mariana Islands).— Asakura 2000: 85, figs. 1C–E, 8, 9, 19D, 20.

Material examined. Ie Island, unnamed submarine cave: entrance, 24 June 2017, 1 ovigerous female (sl 4.4 mm), RUMF-ZC-6046 (IE 179); main tube, 24 June 2017, 1 female (sl 3.7 mm), RUMF-ZC-6047 (IE 183). Okinawa Island, Hedo Dome cave: main tube, 11 August 2016, 1 male (sl 4.0 mm), RUMF-ZC-6048 (HD 2016- 52); same data as RUMF-ZC-6048, 1 male (sl 4.1 mm), RUMF-ZC-6049 (HD 2016-66); main tube, 21 May 2017, 1 male (sl 4.4 mm), RUMF-ZC-6050 (HD 2017-84, addition). Shimoji Island, Akuma-no-Yakata cave: entrance, 1 September 2017, 1 male (sl 4.8 mm), RUMF-ZC-6051 (SH 103).

Distribution. Malaysia, Indonesia, Guam, and Japan (Ryukyu and Izu Islands); subtidal to 35 m (Osawa & Takeda 2004; Okuno & Arima 2006; present study).

Habitat. Coral reefs; often found in small crevices and horizontal holes, or submarine caves in fore-reef slopes (Osawa & Takeda 2004).

Remarks. Pylopaguropsis fimbriata is the most commonly found species of the genus in coral reefs, including submarine caves in the Ryukyu Islands (Asakura 2000; Osawa & Takeda 2004; Osawa & Fujita 2016; Table 2).