Taxonomy & naming
Apistogramma sp. "Winkelfleck" is a hobby name for an undescribed Apistogramma, with no authority, year or type specimen. Winkelfleck is German for angle spot or angular blotch. The form is undescribed, and its identity and range are not documented in the sources behind the atlas.
Morphology
Imperial Tropicals says it has the tall body shape of the Regani group, that mature females show the usual black and yellow pattern, and that mature males have blue iridescent scales on a tan or silver body, with fins mixing pink, orange and blue. It adds that males grow small pointed extensions on the ventral and other fins. These are the seller's statements; no measurements are recorded.
Habitat
Not documented in the atlas's sources. Genus-level: Apistogramma live in the Amazon, Orinoco and neighbouring basins, mostly in small streams over sand and leaf litter.
Feeding
Not documented for this form. Genus-level: Apistogramma pick small invertebrates from the sand and leaf litter and take small frozen and prepared foods in the aquarium.
Mating
Not documented for this form. Genus-level: Apistogramma males hold a territory and court several females, each with her own cave.
Breeding
Imperial Tropicals says the fish it offers were bred in the United States from wild parents. Genus-level: Apistogramma are cave spawners, and the female guards the eggs and fry.
In the aquarium
Imperial Tropicals says the form is imported only occasionally, usually by hobbyists rather than large distributors, and that there are few breeders. Standard dwarf cichlid husbandry applies: soft, acidic to neutral water, a sand bottom, caves and cover, and one male with several females in a tank of adequate size.
Conservation
An undescribed form has no IUCN category, and none is claimed here. Population and range data for it are not documented in the atlas's sources.