分類 / Names
俗名 | 同種異名 | Catalog of Fishes(屬, 種) | ITIS | CoL | WoRMS | Cloffa
Teleostei >
Siluriformes (Catfishes)
鯰形目 (Catfishes) >
Pimelodidae (Long-whiskered catfishes)
油鯰科 (Long-whiskered catfishes)
Etymology: Exallodontus: Name from Greek 'exallos' for quite different and 'odontos' for tooth; referring to the unique form of the teeth.; aguanai: Named for Sr. Leonidas Aguana of the Instituto de Zoologia Tropical Universidad Central de Venezuela..
Environment: milieu / climate zone / depth range / distribution range
生態學
; 淡水 居於水底的; 深度上下限 20 - 30 m (Ref. 58018). 熱帶
South America: Amazon and Orinoco River basins.
南美洲: 亞馬遜河與奧里諾科河河流域。
大小 / 重量 / 年齡
Maturity: Lm ? range ? - ? cm
Max length : 20.0 cm SL 雄魚/尚未辨別雌雄; (Ref. 36506)
簡短描述
檢索表 | 型態特徵 | 形態測量圖
背棘 (總數) : 2; 背的軟條 (總數) : 6; 臀鰭軟條: 11 - 14; 脊椎骨: 46 - 50. Distinguished by having 2-3 rows of heavy, firmly attached conical teeth on premaxillae and dentaries; lacrimal (= infraorbital 1+2) shaped as an obtuse-angled triangle with nearly straight sides; relatively long, nearly straight-margined adipose fin (its length 2.0-2.5 in SL); short dorsal fin spine, low dorsal fin (spine length 5.6-8.6 in SL); relatively small head (head length 4.0-5.2 times in SL); small eye (horizontal diameter 3.4-5.5 times in snout length, 7.4-12.0 times in head length); neural spines of vertebrae 13 or 14 - 23 or 24 oriented 90°to horizontal axis of centra; supraoccipital process with a narrow median keel above somewhat concave sides, markedly angular in cross-section, slender and tapering to its peg-and-socket joint with supraneural (basal width of supraoccipital process about 2 times in length); anterior anal-fin rays broad, forming a paddle-like blade; posterior nostril ovoid, its long axis oriented transversely (Ref. 57763).
Life cycle and mating behavior
Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 仔魚
南美洲: 亞馬遜河與奧里諾科河河流域。
Lundberg, J.G., F. Mago-Leccia and P. Nass, 1991. Exallodontus aguanai, a new genus and species of Pimelodidae (Pisces: Siluriformes) from deep river channels of South America, and delimitation of the subfamily Pimelodinae. Proc. Biol. Soc. Wash. 104 (4):840-869. (Ref. 57763)
IUCN 瀕危狀態 (Ref. 130435)
無危 (LC) ; Date assessed: 21 December 2020
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00933 (0.00439 - 0.01983), b=3.08 (2.90 - 3.26), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
營養階層 (Ref.
69278): 3.8 ±0.7 se; based on size and trophs of closest relatives
回復力 (Ref.
120179): 高度, 族群倍增時間少於 15個月 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (14 of 100).
