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Geotria macrostoma (Burmeister, 1868)

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Geotria macrostoma
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Classification / Names Κοινά ονόματα | Συνώνυμα | Catalog of Fishes(Γένος, Είδη) | ITIS | CoL | WoRMS | Cloffa

> Petromyzontiformes (Lampreys) > Geotriidae (Southern lampreys)
Etymology: Geotria: Etymology not explained, although three possibilities, all problematical, have been proposed: (1) from the Greek geotragia, “eating of earth-like substances,” referring to how this lamprey, like other lampreys, uses its suctorial mouth to attach itself to submerged rocks and stones, thus creating the impression that it is feeding on the earth (problem: geotragia does not mean “earthy,” as in rocks and minerals, but “products of the earth,” such as grains and vegetables; (2) geo- (Gr.), earth, and atrium (L.), room, referring to this lamprey’s nest, presumably made of stones and pebbles assembled by one or both parents (problem: nest-building, while known in other river lampreys, was probably not known to Gray in 1851 and has not been documented for this species); (3) a variation of #2, proposed by Meagher (2010), referring to its discovery in underground chambers, in which it survives dry periods (problem: G. australis does not, nor does any other lamprey, aestivate, nor did Gray indicate it was discovered underground, although he did speculate whether the pouch was an adaptation to the “long drought of the Australian rivers”). See EthyFish.org for more details (See ETYFish)macrostoma: macro-, from makros (Gr.), large; stoma (Gr.), mouth (but used here as an adjective, mouthed), presumably referring to greatly expanded oral disc of spawning adults (See ETYFish).

Issue
Previously synonymized with Geotria australis Gray, 1851. See Ref. 125540 for explanations about the resurrection from Geotria australis.

Environment: milieu / climate zone / depth range / distribution range Οικολογία

; Γλυκού νερού; Υφάλμυρο βενθικό(ς); άγνωστη(ο). Temperate

Κατανομή Χώρες | Περιοχές FAO | Οικοσυστήματα | Παρουσίες | Point map | Εισαγωγές | Faunafri

South America and Southwest Atlantic Islands: De la Plata River, Uruguay; de la Plata River to Tierra del Fuego, Argentina; Malvinas (Falkland) Islands, South Georgia. One record in a river tributary of Magellan Strait in Chile.

Μέγεθος / Βάρος / Age

Maturity: Lm ?  range ? - ? cm
Max length : 62.9 cm TL αρσενικό/απροσδιόριστο; (Ref. 125560)

Short description Κλείδες προσδιορισμού | Μορφολογία | Μορφομετρία

This species is distinguished from G. australis by having a second dorsal fin connected with the caudal fin by a low skin fold (vs. separate), and by the position of the cloaca posterior to the origin of the second dorsal fin in immature and mature adults (cloaca anterior to or under the origin of the second dorsal fin); while the position of fins and cloaca of mature G. macrostoma remains similar to that of juvenile and sub-adults, in spawning adults of G. australis the separation between the second dorsal fin and the caudal fin becomes reduced to a notch (Ref. 125560).

Βιολογία     Γλωσσάρι (π.χ. epibenthic)

Length of sub-adult individuals 41.2-62.9 cm TL (Ref. 125560).

Life cycle and mating behavior Γεννητική Ωρίμανση | Αναπαραγωγή | Γεννοβολία | Αβγά | Γονιμότητα | Προνύμφες

Main reference Upload your references | Αναφορές | Συντονιστής | Συνεργάτες

Firpo Lacoste, F., L. Fernández and C. Scioscia, 2021. On an unknown lamprey holotype (Petromyzon macrostomus Burmeister 1868) and the genus Exomegas Gill 1883 from South America. J. Fish Biol. 99(4):1507-1512. (Ref. 125540)

IUCN Red List Status (Ref. 130435: Version 2024-2)

  Least Concern (LC) ; Date assessed: 06 May 2022

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans






Human uses

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Περισσότερες πληροφορίες

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References
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Διαδικτυακές πηγές

AFORO (otoliths) | Aquatic Commons | BHL | Cloffa | BOLDSystems | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes: Γένος, Είδη | DiscoverLife | ECOTOX | FAO - Publication: search | Faunafri | Fishipedia | Fishtrace | GenBank: genome, nucleotide | GloBI | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | Εθνικές βάσεις δεδομένων | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Socotra Atlas | Δέντρο Ζωής | Wikipedia: Go, αναζήτηση | World Records Freshwater Fishing | Zoological Record

Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = No PD50 data   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00102 (0.00046 - 0.00225), b=3.06 (2.88 - 3.24), in cm total length, based on all LWR estimates for this body shape (Ref. 93245).
Τροφικό Επίπεδο (Ref. 69278):  4.4   ±0.8 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref. 59153):  Moderate to high vulnerability (45 of 100).