Okumura, K. I. (2023b). First recorded species of spiders from Chiba and Ibaraki Prefectures. Kishidaia 123: 62-63.
| Taxon | |
|---|---|
| Gnaphosa potanini Simon, 1895 (Gnaphosidae) | 63, f. 4, (m), Gnaphosa potanini |
| Neoantistea quelpartensis Paik, 1958 (Hahniidae) | 63, f. 1, (f), Neoantistea quelpartensis |
| Gongylidioides communis Saito & Ono, 2001 (Linyphiidae) | 63, f. 2, (f), Gongylidioides communis |
| Robertus nojimai Yoshida, 2002 (Theridiidae) | 63, f. 3, (f), Robertus nojimai |