Classification / Names
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Cichliformes (Cichlids, convict blennies) >
Cichlidae (Cichlids) > Ptychochrominae
Etymology: Ptychochromis: Greek, ptyx, = fold + Greek, chromis = a fish, perhaps a perch (Ref. 45335); ernestmagnusi: Named in honor of Mr. Ernest Magnus of Berlin, Germany, and New York City, at the request of the family of Dr. Rudolph G. Arndt, whose support of ichthyological exploration and research at the American Museum of Natural History is gratefully acknowledged (Ref. 83427).
Eponymy: Ernest Magnus (1908–1983) was honoured at the request of the family of Rudolf G Arndt, a German-American marine biologist and ichthyologist, whose ‘generous gift’ supported the authors’ research (Magnus was Arndt’s uncle and was instrumental in help [...] (Ref. 128868), visit book page.
Environment: milieu / climate zone / depth range / distribution range
Ecología
; agua dulce bentopelágico. Tropical
Africa: Mananara (du nord) River in northeastern Madagascar (Ref. 83427).
Tamaño / Peso / Age
Maturity: Lm ? range ? - ? cm
Max length : 14.7 cm SL macho / no sexado; (Ref. 83427)
Short description
Claves de identificación | Morfología | Morfometría
Espinas dorsales (total) : 12 - 13; Radios blandos dorsales (total) : 11 - 13; Espinas anales: 3; Radios blandos anales: 7 - 9; Vértebra: 27 - 28. Diagnosis: Ptychochromis ernestmagnusi is a Ptychochromis exhibiting the eastern-type palatine morphology and is further distinguished from all congeners except P. grandidieri, P. loisellei, P. makira and P. curvidens by an anterior displacement of the first supraneural such that it overlies the dorsoposterior margin of the supraoccipital (Ref. 83427). Among eastern group Ptychochromis, P. makira shares with P. ernestmagnusi the possession of supraneurals with a characteristically flattened dorsal profile, which is interpreted here as a synapomorphy uniting these two geographically proximate species; also shared with P. makira is the presence of strong, paired, lateral barring as a prominent component of pigmentation patterning; however, P. makira can be distinguished by distinctively V-shaped lateral flank bars, whereas in P. ernestmagnusi the bars are oriented vertically; Ptychochromis ernestmagnusi is further distinguished from P. makira by conspicious iridescent spangling on the flank and dorsal fin near its base, dusky grayish-green base colouration vs. whitish, four lachrymal laterosensory foramina vs. three, and a total of seven infraorbital bones vs. six (Ref. 83427).
Found in a region which is characterized by humid, lowland rainforest; with a steep overall profile, and a generally rocky to sandy substrate (Ref. 83427).
Life cycle and mating behavior
Madurez | Reproducción | Puesta | Huevos | Fecundidad | Larva
Sparks, J.S. and M.L.J. Stiassny, 2010. A new species of Ptychochromis from northeastern Madagascar (Teleostei: Cichlidae), with an updated phylogeny and revised diagnosis for the genus. Zootaxa 2341:33-51. (Ref. 83427)
IUCN Red List Status (Ref. 130435: Version 2024-2)
Threat to humans
Harmless
Human uses
Herramientas
Special reports
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Fuentes de Internet
Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5010 [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).
Nivel trófico (Ref.
69278): 3.4 ±0.5 se; based on size and trophs of closest relatives
Resiliencia (Ref.
120179): Alto, población duplicada en un tiempo mínimo inferior a 15 meses (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
