Megasyllis San Martín Hutchings & Aguado 2008
- Megasyllis inflata (Marenzeller 1879)
- Megasyllis inflata フクロシリス
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Photo by Kazuyuki Yamada, collected material at Okitsu Beach, Katsu-ura, Chiba, Japan
- Megasyllis nipponica (Imajima 1966)
- Megasyllis nipponica ミドリシリス
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Photo by Kazuyuki Yamada, collected material at Koshimoda, Toi, Shizuoka, Japan