Key to species of Glyphohesione Friedrich, 1950 1. Prostomium lacking eyespots............................................................................ 2 – Prostomium with eyespots................................... G. nicoyensis Dean, 1988 (Gulf of Nicoya, Costa Rica) 2. Lateral antennae located on the anterior of prostomium........................................................3 – Lateral antennae located on the middle-lateral of prostomium; lacking ventral cirri at chaetiger 2; first notopodial spines begin on chaetiger 6....................................................... G. pattaniensis sp. nov. (Gulf of Thailand) 3. First notopodial spines from chaetigers 5–8................................................................. 4 – First notopodial spines from chaetigers 10–15, neurochaetae with bifid tips... G. longocirrata Licher, 1994 (Gulf of Mexico) 4. Neurochaetae tips entire and straight, first notopodial spines from chaetiger 5................................................................ G. campensis Ribeiro, Barbosa, Freitas, Zanol, Glasby & Ruta, 2020 (Campos Basin, Brazil) – Neurochaetae with entire and curved tips, first notopodial spines from chaetigers 5–8.......................................................................................... G. klatti Friedrich, 1950 (North Sea, Atlantic Ocean)

Published as part of Plathong, Jintana, Plathong, Sakanan & Dean, Harlan K., 2024, New species of Glyphohesione and Pseudexogone (Annelida, Pilargidae) from the Gulf of Thailand, pp. 235-252 in Zootaxa 5428 (2) on page 242, DOI: 10.11646/zootaxa.5428.2.4, http://zenodo.org/record/10847479