OKADA, RYOHEI, Thailand National History Museum; National Science Museum; Pathum Thani; 12120 Thailand; Coleopterological Society of Japan. National Museum of Nature and Science; Tsukuba; 3050005 Japan, Thailand

• Zootaxa Vol. 5428 No. 3: 22 Mar. 2024 - Article
  A review of Agnoshydrus Biström, Nilsson & Wewalka, 1997 (Coleoptera: Dytiscidae: Hyphydrini), with descriptions of two new species from Thailand
  Abstract  PDF(4.69MB)
• Zootaxa Vol. 5437 No. 1: 11 Apr. 2024 - Erratum
  Erratum: RYOHEI OKADA (2024) A review of Agnoshydrus Biström, Nilsson & Wewalka, 1997 (Coleoptera: Dytiscidae: Hyphydrini), with descriptions of two new species from Thailand. Zootaxa, 5428 (3): 440–448.
  Abstract  PDF(345.18KB)