On the invalid resurrection of the lamprey genus Exomegas Gill, 1883. Issue 3 (20th December 2021)

• Record Type: Journal Article
• Authors: Riva‐Rossi, Carla; Renaud, Claude B.; Neira, Francisco J.; Baigún, Claudio; Baker, Cindy F.; Quiroga, Pamela; Potter, Ian
• Is Part Of: Journal of fish biology. Volume 100:Issue 3(2022)
• Page Start: 831
• Page End: 834
• Publication Date: 2021-12-20
• Subjects: Exomegas -- Geotria australis -- Geotria macrostoma -- lamprey -- transverse lingual lamina; Fishes -- Periodicals; Fishes -- Great Britain -- Periodicals; 597
• DOI: 10.1111/jfb.14975
• Languages: English
• ISSNs: 0022-1112

Abstract

Abstract: The lamprey genus Exomegas Gill, 1883, was erected on the assumption that it was distinguishable from Geotria Gray, 1851, by possessing three rather than two cusps on the transverse lingual lamina (TLL). Based on literature review and examination of holotypes and new data, the authors reaffirm that the TLL of Geotria possesses two or three cusps in the adult stage. The reduction or disappearance of the middle cusp at the beginning or during the spawning run constitutes a key feature of Geotria . The resurrection of Exomegas by Firpo Lacoste, Fernández and Scioscia, Journal of Fish Biology, 2021, 1–6, 1507–1512, is therefore unjustified and not supported.