Lethenteron alaskense, Alaskan brook lamprey

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Lethenteron alaskense Vladykov & Kott, 1978

Alaskan brook lamprey
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Lethenteron alaskense
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分類 / Names 俗名 | 同種異名 | Catalog of Fishes(, ) | ITIS | CoL | WoRMS | Cloffa

Petromyzonti > Petromyzontiformes (Lampreys) 七鰓鰻目 (Lampreys) > Petromyzontidae (Northern lampreys) 七鰓鰻科 (Northern lampreys) > Lampetrinae
Etymology: Lethenteron: Greek, letheia = apathetic (lethe = oblivion) + Greek, enteron = intestine (Ref. 45335); referring to the degeneration of the intestine (Ref. 117245).

Environment: milieu / climate zone / depth range / distribution range 生態學

; 淡水 居於水底的; 河川洄游 (Ref. 43939).   溫帶

分布 國家 | FAO區域 | 生態系 | 發現紀錄 | Point map | 簡介 | Faunafri

North America: Alaska and Kenai peninsulas to Chatanika and Chena rivers near Fairbanks; Martin River, Mackenzie River basin, Northwest Territories.
北美洲: 阿拉斯加州與肯奈半島到 Chatanika 與費班克附近的Chena 河; 馬丁河,麥肯茲河流域,西北地區。

大小 / 重量 / 年齡

Maturity: Lm ?  range ? - ? cm
Max length : 18.8 cm TL 雄魚/尚未辨別雌雄; (Ref. 43939)

簡短描述 型態特徵 | 形態測量圖

Adult preserved specimens gray-brown dorsally, white ventrally, with a dark blotch on 2nd dorsal fin; tail dark. Teeth on disk blunt and weakly cornified. Tongue teeth poorly developed and blunt. Typical length 12-17 cm TL (Ref. 43939). Trunk myomeres 66-72 (Ref. 43938, 89241). Other adult diagnostic features: 12.2-18.8 cm TL. Body proportions, as percentage of TL (based on 68 specimens measuring 12.2-18.8 cm TL): prebranchial length, 9.3-14.9; branchial length, 8.7?11.6; trunk length, 45.4-53.5; tail length, 25.7-33.5; eye length, 1.7-3.2; disc length, 3.8-7.3. Urogenital papilla length, as a percentage of branchial length, in a 14.1 cm TL spawning male, 26.9. The shape of the second dorsal fin in spawning males is arch-like and in females triangular. Dentition: supraoral lamina, 2 unicuspid teeth (1 of 34 specimens had 2 additional small unicuspid teeth on the bridge); infraoral lamina, 6-11 teeth, the lateralmost one on each side unicuspid or bicuspid and the internal ones unicuspid; 3 endolaterals on each side; endolateral formula, 2-2-2; 3 rows of anterials; first row of anterials, 3-5 unicuspid teeth; total number of anterials, 23-38 unicuspid teeth; exolaterals absent or one or two unicuspid exolaterals present in each lateral field, exceptionally, one complete row of exolaterals on each side; single row of posterials, 17-24 unicuspid teeth; transverse lingual lamina, 9-15 unicuspid teeth, the median one greatly enlarged; longitudinal lingual laminae each with 6-13 unicuspid teeth. Velar tentacles, 5-7, with tubercles and with the single median tentacle shorter than the lateral tentacles immediately next to it. Body coloration (preserved) in mature adults is gray brown on the upper surface and flanks and whitish on the lower surface. Lateral line neuromasts unpigmented. Gular region unpigmented (2 of 64 specimens had weak pigmentation). Second dorsal fin with a dark blotch near the apex (4 of 64 specimens did not have a blotch). Extent of caudal fin pigmentation, 1% to <25% (17% of specimens), 25% to <75% (36%) or, 75% or more (46%). Caudal fin shape, spade-like. Oral papillae, 18 (Ref. 89241).
成魚的保存標本灰褐色背面, 腹側白色的, 在第二背鰭鰭上具有一個黑色斑塊; 尾部深色的。 牙齒在圓盤鈍與弱的 cornified 。 嘴上的橫帶有兩個尖頭。 嘴下的橫帶 6-11個尖頭。 側齒板 3, 中央的對有兩個尖頭。 舌齒發展不良的與鈍的。 後面的齒呈現。 一些, 增補的邊緣齒位於圓盤的側面區域之上。 典型的長度 12-17 公分TL.(參考文獻 43939) 軀幹 myomeres 66-72.(參考文獻 43938)

生物學特性     字彙 (例如 epibenthic)

Freshwater, in creeks and rivers (Ref. 89241). A non-parasitic lamprey. At about 4 years of age transforms from ammocoete in fall, moves downstream into lakes over winter; spawns the following spring and summer in shallow of lakes and rivers (Ref. 43939). Spawning period between 11 June and 25 September in Naknek River Basin, Alaska. Fecundity, 2,188-3,477 eggs/female. Egg length, 0.9 mm (Ref. 89241).

一個非寄生的八目鰻。 在秋天於大約來自 ammocoete 的 4 歲變換,移動在冬天以來進入湖之內順流而下; 在湖與河的淺灘中產卵下一個春天與夏天。 (參考文獻 43939)

Life cycle and mating behavior 成熟度 | 繁殖 | 產卵場 | | 孕卵數 | 仔魚

北美洲: 阿拉斯加州與肯奈半島到 Chatanika 與費班克附近的Chena 河; 馬丁河,麥肯茲河流域,西北地區。

主要參考資料 Upload your references | 參考文獻 | 合作者 | 合作者

Mecklenburg, C.W., T.A. Mecklenburg and L.K. Thorsteinson, 2002. Fishes of Alaska. American Fisheries Society, Bethesda, Maryland. xxxvii +1037 p. (Ref. 43939)

IUCN 瀕危狀態 (Ref. 123251)

  資料不足 (DD) ; Date assessed: 21 February 2012

CITES (Ref. 123416)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

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Estimates based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5039   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00117 (0.00051 - 0.00272), b=3.00 (2.80 - 3.20), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
營養階層 (Ref. 69278):  3.4   ±0.4 se; based on size and trophs of closest relatives
回復力 (Ref. 120179):  低的, 最小族群倍增時間4.5 - 14 年 (tm=tmax=5).
瀕危性 (Ref. 59153):  Moderate to high vulnerability (45 of 100) .