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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: -ensis, Latin suffix denoting place: Río Gallegos drainage, southeastern Argentina, where type locality (Río Turbios) is situated. (See ETYFish).
Environment: milieu / climate zone / depth range / distribution range
بوم شناسي
; آب شيرين; لب شور نزديك كف زي; unknown. Temperate
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.
Size / Weight / سن
Maturity: Lm ? range ? - ? cm
Max length : 62.9 cm TL جنس نر / بدون خواص جنسي; (Ref. 125560)
توصيف مختصر
ريخت شناسي | ريخت ستجي بوسيله انداره گيري
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).
Length of sub-adult individuals 41.2-62.9 cm TL (Ref. 125560).
Life cycle and mating behavior
بلوغ | تولید مثل | تخم ریزی | تخم ها | Fecundity | توزاد ( لارو)
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)
وضعيت در فهرست قرمز IUCN (Ref. 130435)
استفاده انسانی
اطلاعات بيشتر
اسامي عاممترادفسوخت و سازشکارچیانسم شناسي بوم زيستيتولید مثلبلوغتخم ریزیSpawning aggregationFecundityتخم هانمو تخم
Age/Sizeرشدطول - وزنطول - طولنوسانات طولیريخت ستجي بوسيله انداره گيريريخت شناسيتوزاد ( لارو)پويايي لارويبازسازیفراوانيBRUVS
مراجعآبزي پرورينمايه آبزي پرورينژادهاژنتيكElectrophoresesوارثبيماري هافرآوریNutrientsMass conversion
همكارانعکس هاStamps, Coins Misc.صداهاسيگواتراسرعتنوع شناگریمنطقه آبششيOtolithsمغزهابینایی
ابزارها
گزارش های ويژه
بارگيری XML
منابع اينترنتي
Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 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).
Trophic level (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).
