分類 / Names
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Characiformes (Characins) >
Characidae (Characins; tetras) > Characinae
Etymology: Priocharax: Greek, prio = to saw + Greek, charax, -akos = a fish without identification (Ref. 45335); britzi: Named after Dr. Ralf Britz, noteworthy ichthyologist, he mastered the world of small fishes and has described more than 20 miniature species, including two species of Priocharax; noun in the genitive case.
Eponymy: Dr Ralf Britz is a German zoologist and ichthyologist whose research foci are the anatomy, ontogeny and systematics of fish. [...] (Ref. 128868), visit book page.
Environment: milieu / climate zone / depth range / distribution range
生態学
; 新鮮な水 底生の漂泳性; 深さの範囲 0 - 1 m (Ref. 124594). Tropical
South America: Brazil.
サイズ / 重さ / 年齢
Maturity: Lm ? range ? - ? cm
Max length : 1.4 cm SL オス/雌雄の選別がない; (Ref. 124594)
簡単な記述
検索表 | 形態学 | 形態計測学
背鰭 (合計) : 9; 臀鰭: 22 - 27; 脊つい: 32 - 33. This species is distinguished from all its congeners except P. pygmaeus by having lower number of teeth in the maxilla 21-30 (vs 32-58) and dentary 26-29 (vs 33-55); differs from P. pygmaeus by the presence of two postcleithra (vs. absence and branched anal-fin rays 22-27 modes 25 and 26 (vs. 19-22, mode 19); differs fom P. nanus and P. varii by having pelvic-fin rays i,5 (vs.i,6) and postcleithrum 3, slender and sinuous (vs. relatively thick and straight); differs from P. ariel by the branched anal-fin rays 22-27 (vs. 16-22) and with two postcleithra (vs. absent); further differs from P. varii by the absence of the adipose fin (vs. presence) and from P. nanus by the absence of the claustrum (vs. presence); with a shorter snout relative to the orbital diameter when compared to all congeners except P. nanus [range of the proportion of snout length in relation to orbital diameter and its mean is 45-59 (mean = 53.6; SD = 3.8) in P. britzi vs. 60-76 (mean = 65.5; SD = 4.9) in P. pygmaeus, 54-81 (mean = 67.0; SD = 5.1) in P. varii and 54-84 (mean = 68.4; SD = 6.3) in P. ariel]. Molecular analyses further support the recognition of the new species (Ref. 124594).
Specimens were collected from a small lake approximately 15 m wide and 35 m long, apparently isolated from the main channel of the rio Ipixuna and where the water level was low as sampling occurred during the dry season (September). It is possible that this lake connects to the main channel in the wet season. Collection was done near the shore at depths varying from 0.5–1.0 m, when the bottom was muddy with patches of leaf litter. Vegetation around the lake was composed mainly of dead logs and branches. Collected with the characiforms Carnegiella marthae, Hemigrammus sp., Hyphessobrycon rosaceus. Iguanodectes spilurus, Microcharacidium sp., Nannostomus digrammus, Nannostomus eques; the catfish Amblydoras affinis; the knifefishes Brachyhypopomus beebei, Microsternarchus bilineatus; the cichlids Apistogramma cf. pulchra, Biotoecus opercularis and Crenicichla cyanotus (Ref. 124594).
Life cycle and mating behavior
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Mattox, G.M.T., C.d.S. de Souza, M. Toledo-Piza and C. Oliveira, 2021. A new miniature species of Priocharax (Characiformes: Characidae) from the upper rio Ipixuna, Purus drainage, Brazil. Neotrop. Ichthyol. 19(2). (Ref. 124594)
IUCNのレッドリストの状況は (Ref. 130435: Version 2024-2)
Human uses
水産業: 興味がない
用具
特記事項
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インターネットの情報源
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=0.00661 (0.00301 - 0.01449), b=3.11 (2.93 - 3.29), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
栄養段階 (Ref.
69278): 2.9 ±0.4 se; based on size and trophs of closest relatives
回復力 (Ref.
120179): 高い, １５か月以下の倍増期間の最小個体群 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
