Dionisia Lahille 1915 non Landau Chabaud, Miltgen & Baccam 1980
Exomegas Gill 1883 non Burmeister 1868
Macrophthalmia Plate 1897
Neomordacia Castelnau 1872
Thysanochilus Troschel 1857 non Butler 1878 non non Falc. 1839
Velasia Gray 1853
Yarra Castelnau 1872 non Krapp-Schickel 2000
Geotria is the only genus in the lamprey family Geotriidae. It has 2 known species: Geotria australis (pouched lamprey) and Geotria macrostoma (Argentinian lamprey). Both species were considered conspecific until G. macrostoma was revived in a 2020 study.[1]
The family Geotriidae is most closely related to the lamprey family Mordaciidae, which has a similar Gondwanan distribution, and both families diverged during the Early Cretaceous. Together, their common ancestor diverged from the Petromyzontidae during the Middle Jurassic.[2]
G. australis spawns in Pacific-draining river basins in on either side of the southern Pacific (both Australasia and Chile), while G. macrostoma spawns in Atlantic-draining basins in southern South America and nearby subantarctic islands. Despite the occurrence of both species in South America and both formerly being considered conspecific, phylogenetic studies suggest that the lineages of both species diverged during the Late Cretaceous, indicating very ancient origins for both.[1][2]
^ abRiva-Rossi C, Barrasso DA, Baker C, Quiroga AP, Baigún C, Basso NG (May 29, 2020). "Revalidation of the Argentinian pouched lamprey Geotria macrostoma (Burmeister, 1868) with molecular and morphological evidence". PLOS ONE. 15 (5): e0233792. Bibcode:2020PLoSO..1533792R. doi:10.1371/journal.pone.0233792. PMC 7259705. PMID 32470001.
^ abBrownstein, Chase Doran; Near, Thomas J. (2023-01-23). "Phylogenetics and the Cenozoic radiation of lampreys". Current Biology. 33 (2): 397–404.e3. doi:10.1016/j.cub.2022.12.018. ISSN 0960-9822. PMID 36586410. S2CID 255278945.
Geotria is the only genus in the lamprey family Geotriidae. It has 2 known species: Geotria australis (pouched lamprey) and Geotria macrostoma (Argentinian...
The pouched lamprey (Geotria australis), also known as the piharau in the North Island, korokoro, kanakana in the South Island, or wide-mouthed lamprey...
fresh waters and are found in most temperate regions. Some species (e.g. Geotria australis, Petromyzon marinus, and Entosphenus tridentatus) travel significant...
ultrastructure in the lamprey (cyclostomata) with special emphasis on Geotria australis (gray)". Microscopy Research and Technique. 35 (6): 431–444....
Kūmara (Ipomoea batatas) Kererū (Hemiphaga novaeseelandiae) Korokoro (Geotria australis) Because of the frequent poor weather in winter, the viewing...
These teeth are pointed, unlike the other southern hemisphere lamprey Geotria australis which has spatulate (broad and rounded) teeth. The eyes of Mordacia...
discovered. Both members of this genus resemble the modern pouched lamprey (Geotria australis). Yanliaomyzon bears a toothed oral disc that is much more similar...
518–0 Ma PreꞒ Ꞓ O S D C P T J K Pg N One of the surviving agnatan familiy, Geotria Life reconstruction of extinct agnatan genus, Pteraspis Scientific classification...
Tahu, and was tribally renowned for its abundance of kanakana (lamprey, Geotria australis). Kanakana are normally caught when climbing natural waterfalls...
ultrastructure in the lamprey (cyclostomata) with special emphasis on Geotria australis (gray)". Microscopy Research and Technique. 35 (6): 431–444....
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