分类 / Names
俗名 | 同种异名 | Catalog of Fishes(属, 种) | ITIS | CoL | WoRMS | Cloffa
Teleostei >
Cyprinodontiformes (Rivulines, killifishes and live bearers) >
Nothobranchiidae (African rivulines)
Etymology: Nothobranchius: Greek, nothos = false + Greek, brangchia = gill (Ref. 45335); derhami: The specific name epithet is given in honour of Patrick de Rham, Lausanne, Swiss, who first discovered the new species on the 7th of July 1985 in a grassy swamp situated near Ahero on the east side of the Nakuru to Kisumu road and for his contribution on observing in the field part of the life cycle of this species; a noun in genitive (Ref. 123202).
Environment: milieu / climate zone / depth range / distribution range
生态学
; 淡水 底中水层性; pH range: 7.6 - 7.6. 25°C - 31°C (Ref. 123202)
Africa: seasonal pools from Nyando River system, Lake Victoria basin, in Kenya (Ref. 123202).
大小 / 重量 / 年龄
Maturity: Lm ? range ? - ? cm
Max length : 3.8 cm SL 雄鱼/尚未辨别雌雄; (Ref. 123202)
简单描述
检索表 | 型态特徵 | 形态测量图
背棘 (总数) : 0; 背的软条 (总数) : 15 - 17; 臀棘: 0; 臀鳍软条: 15 - 17; 脊椎骨: 27. Diagnosis: Nothobranchius derhami belongs to the N. ugandensis species group presenting the following combination of characters in males: body colouration light blue with red to red-brown scale margins; frontal part of headred-brown and throat light blue or red, caudal fin uniform red; anal fin light blue or yellow with red-brown spotted pattern (Ref. 123150). It differs from all members of the N. ugandensis species group by a dorsal fin with a slender light blue subdistal band and a narrow black distal band; an anal fin with broad subdistal zone cream to yellow, with narrow red-brown to black distal band; and a smaller suborbital depth, 16-18% of head length vs. 19-28% (Ref. 123150). Males from Nothobranchius derhami are distinguished from the similar N. ugandensis by lower jaw light blue vs. lower jaw red in red morph or grey brown in yellow morph of N. ugandensis, upper lip and snout red vs. grey brown on yellow morph, the body sides with red irregular vertical stripes vs. without red pattern in yellow morph, by dorsal fin with subdistal blue stripe and broad black rim vs. without defined subdistal stripe and rim, by anal fin with spots vs. without spots or if present reduced to a few dots, and caudal fin plain red vs. yellowish with a black marginal stripe and with or without dark dots in the yellow morph, red anteriorly, orange posteriorly and with a black margin in some of the red morph (Ref. 123202). Males of N. derhami are distinguished from the congener, nearest in distribution, N. robustus, by light blue with posterior margin of the scale red creating a banded pattern on flank vs. intense plain red colouration on whole flank, or at least on posterior half portion, by light blue proximal portion with a pattern of red spots on dorsal, anal and pelvic fin vs. fins completely red (Ref. 123202).
Found in seasonal pools less than 1 m deep and with aquatic vegetation; the water was light clay grey and turbid, with a pH of 7.6 and temperature ranging from 25-31°C depending on the position in the water column (Ref. 123202).
Life cycle and mating behavior
Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 仔鱼
Valdesalici, S. and G. Amato, 2019. Nothobranchius derhami (Cyprinodontiformes: Nothobranchiidae), a new species of seasonal killifish from western Kenya. Aqua, Int. J. Ichthyol., 25(3):111-124. (Ref. 123202)
世界自然保护联盟红皮书 (Ref. 130435)
濒危 (EN) (B1ab(iii)+2ab(iii)); Date assessed: 18 May 2020
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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=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
营养阶层 (Ref.
69278): 3.2 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
