التصنيف / Names
الأسماء الشائعة | مرادفات | Catalog of Fishes(جنس, الانواع) | ITIS | CoL | WoRMS | Cloffa
>
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 / نطاق العمق / distribution range
البيئة
; المياه العذبة قاعية التغذية و المعيشة; pH range: 7.6 - 7.6. Tropical; 25°C - 31°C (Ref. 123202)
Africa: seasonal pools from Nyando River system, Lake Victoria basin, in Kenya (Ref. 123202).
الحجم / وزن / العمر
النضج: Lm ? range ? - ? cm
Max length : 3.8 cm SL ذكر/ مختلط الجنس; (Ref. 123202)
وصف مختصر
مفاتيح التعريف | الوصف الخارجي | قياسات المظهر الخارجي
الأشواك الظهرية (المجموع) : 0; الأشعة الظهرية الناعمة (المجموع) : 15 - 17; شوكة شرجية: 0; أشعه شرجية لينه: 15 - 17; فقرات: 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).
Body shape (shape guide): fusiform / normal; Cross section: compressed.
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
النضج | التكاثر | وضع البيض | بيض | الخصوبة | Larvae
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)
IUCN Red List Status (Ref. 130435: Version 2025-1)
في خطر (EN) (B1ab(iii)+2ab(iii)); Date assessed: 18 May 2020
استخدامات بشرية
أدوات
تقارير خاصة
Download XML
مصادر علي الأنترنت
Estimates based on models
Phylogenetic diversity index (مرجع
82804): PD
50 = 0.5000 [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).
مستوى غذائي (مرجع
69278): 3.2 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
🛈
