Corydoras melanistius

Super Group: 
Opisthokonta
Phylum: 
Chordata
Sub-Phylum: 
Vertebrata
Class: 
Actinopteri
Order: 
Siluriformes
Family: 
Callichthyidae
Sub-Family: 
Corydoradinae
Genus: 
Corydoras
Species: 
melanistius
Authority: 
Regan 1912
Synonym(s): 
Corydoras brevirostris (Fraser-Brunner, 1947)
Corydoras wotroi
Corydoras melanistius longirostris (Hoedeman, 1952)

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

Omnivorous

Mode of locomotion

Motility: motile_swimming

Reference(s)

Observation site(s)

SYMBIONTS

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