Magelonidae

• Main Authors: Taylor, Abbie, Mortimer, Kate, Jimi, Naoto
• Format: Other/Unknown Material
• Language: unknown
• Published: 2022
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Magelonidae; Pacific; Sakhalin
• Online Access: https://zenodo.org/record/7244463; https://doi.org/10.5281/zenodo.7244463

Key to adult specimens of known Magelonidae species in the North-Western Pacific (type localities/ confirmed locations given in brackets (modified from Mortimer et al. 2022). Full descriptions of characters can be found in Mortimer et al. (2021a). 1. Prostomium with distinct prostomial horns. 2 - Prostomium without prostomial horns, or with a squared anterior margin (often referred to as “rudimentary horns”). 9 2. Anterior margin appearing smooth (minute crenulations only present under high magnification). 3 - Anterior margin crenulate (degree of crenulation variable). 5 3. Deep purple pigment band between chaetigers 5 and 8. M. japonica (Korean Archipelago, Japan) - No marked pigmentation of the thoracic region. 4 4. Prostomium wider than long, no superior dorsal lobes of the thoracic region. Abdominal parapodia sub-equal, those of the neuropodia being somewhat smaller. M. koreana (Korean Archipelago) - Prostomium longer than wide, superior dorsal lobes from chaetigers 1–8, abdominal parapodia approximately equal. M. boninensis sp. nov. (Japan) 5. Prostomium width approximately similar to length. 6 - Prostomium wider than long. 7 6. Abdominal hooded hooks bidentate. M. crenulifrons (Viet Nam, Hong Kong, Natuna Islands) - Abdominal hooded hooks tridentate. M. cf. cornuta (Hong Kong, Japan, see remarks) 7. Superior dorsal lobes present in the thorax. 8 - No superior dorsal lobes present in thorax, anterior margin only minutely crenulate. M. petersenae (Thailand) 8. Small superior dorsal lobes present on chaetiger 9, abdominal hooded hooks tridentate. M. lenticulata (Viet Nam) - No superior dorsal lobes present on chaetiger 9, abdominal hooded hooks bidentate. M. methae (Thailand) 9. Chaetiger 9 with mucronate chaetae. 10 - Chaetiger 9 bearing capillary chaetae only, as in chaetigers 1–8. 13 10. Abdominal hooded hooks tridentate. 11 - Abdominal hooded hooks bidentate. M. sachalinensis (Sakhalin Island) 11. Anterior thoracic notopodial lamellae with smooth or lightly crenulated upper edges. 12 - Anterior thoracic ...