Table 1. Ringiculid specimens used in this study.
| Species | Locality | Cruise/Station | Coordinates | Depth | Voucher |
|---|---|---|---|---|---|
| Ringicula doliaris | Nogama Is., Amakusa, Japan | 32°35′N, 130°23′E | 0–1 m | AORI YK#901 | |
| Ibusuki, Kagoshima, Japan | 31°15′N, 130°39′E | 0–1 m | ZSM Mol 20140461–0464 | ||
| Ringiculia sp. cf. pilula | W of Amami Is., Japan | T/V Nagasaki-maru N319, J-6(4) | 28°33′N, 127°02′E | 588–621 m | AORI YK#1463 |
| Ringiculopsis foveolata | W of Amami Is., Japan | T/V Nagasaki-maru N307, J-6(2) | 28°33′N, 127°02′E | 606–607 m | AORI YK#1461 |
| Microglyphis japonica | E of Kamaishi, Honshu Is., Japan | R/V Tansei-maru KT-12-18, St. 15 | 39°02′N, 142°24′E | 1019–1041 m | AORI YK#2528 |
| Microglyphis sp. | SE of Falkland Is., Drake Strait | R/V Polarstern ANTXIX5, PS61/150-1 | 54°30′S, 56°08′W | 286–291 m | ZSM Mol 20140700 (B008) |
| ‘Microglyphis’ sp. | W of Amami Is., Japan | T/V Nagasaki-maru N319, J-6(5) | 28°33′N, 127°02′E | 608–631 m | AORI YK#1460 |
| Ringiculoides kurilensis | S of Kamchatka, Russia | R/V Hakuho-maru KH-14-2, NBD-1 | 47°00′N, 160°02′E | 5179–5223 m | AORI YK#2531 |
| SE of Hokkaido Is., Japan | R/V Sonne SO223 (KuramBio), St. 09-09 | 40°35′N, 150°59′E | 5398 m | ZSM Mol 20130355 (B319) |
Ringicula doliaris from Ibusuki were formalin-fixed and used for microanatomy; others represent pure-ethanol preserved material for molecular phylogeny.