Corydoras melanistius
Diagnosis
Diagnosis_Genus: Corrydoras Lacépède. De grandes lames de chaque côté du corps et de la queue; la tête couverte de pièces larges et dures; la bouche à l’extrémité du museau; point de barbillons; deux nageoires dorsales; plus d’un rayon à chaque nageoire du dos.
Diagnosis_Species: Corydoras melanistius Regan. Depth of body 2 1/2 in the length, length of head 3 1/2. Snout nearly 1/2 length of head; diameter of eye 3 1/2 in tiie length of head, interorbital width 2 to 2 1/3. Suborbital narrow, its depth about 1/2 diameter of eye; barbel not reaching gill-opening. Dorsal I 7 ; spine as long as head; soft rays decreasing from first, which is as long as spine; base a little more than distance from adiitose fin, which is preceded by 4 median scutes. Anal 1 6. Pectoral spine as long as or longer than head, extending to or beyond middle of pelvics. Scutes 21-23/19-20; humeral shields not in contact below, each separated by one scute from base of pelvic fin. 3 or 4 series of small dark spots on side; dorsal fin blackish, the colour extending on to the back below it; other fins pale, immaculate.
Body_length: 6.0 cm
Etymology
Etymology: Corydoras: Greek, kory = helmet + greek, doras = skin
Type species
The type species of the genus Corydoras is Corydoras geoffroy (Lacépède, 1803).
Type illustration / Type locality / Type specimen
Paralectotypes: BMNH 1864.1.21.87 (1).
Type locality: Essequibo R., Guyana.
Lectotype (designated by Nijssen & Isbrücker, 1967: 32), BMNH 1864.1.21:86, si 35.0 mm, Guyana, Essequibo, coll. Ehrhardt; — 1 paralectotype, BMNH 1864.1.21.87, si 39.4 mm, same data as lectotype.
Ecology
Habitat: Coastal rivers and tributaries
Habitat: Guyana, Suriname and French Guiana.
Temperature: 22-26 °C
pH: 6.4-7.4
Sociability_adults: gregarious
Substrate: water
Substrate: sand
Substrate: gravel
Salinity: freshwater
Depth: Epipelagic
Migratory: no
Life cycle
Longevity: more than 3 years (3-5years)
Generation_time: 1 to 3 years
Reproduction_mode: sexual
Fecundity: The female holds 2-4 eggs between her pelvic fins, where the male fertilizes them for about 30 seconds. Only then the female swims to a suitable spot, where she attaches the very sticky eggs. The pair repeats this process until about 100 eggs have been fertilized and attached.
Sexual_dimorphism: When viewed from above, the females will be slightly larger and have a plumper body shape than the males.
Feeding behaviour
Mode of locomotion
Original description
Reference(s)
Attached phylogeny
Observation site(s)
SYMBIONTS
Association with... | Region origin | Name of site | In reference... |
---|---|---|---|
Piscinoodinium pillulare | Université of Stirling | (1998) |