How to Identify Black Molly

To identify Black Molly (Poecilia sphenops var.), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Uniform, intense black coloration covering the entire body and fins. Some individuals may exhibit a slight metallic sheen under certain lighting.

Scale type

cycloid

Mouth position

superior

Distinctive features

Velvety black pigmentation, Sexual dimorphism (males with gonopodium, females larger and rounder), Relatively small, upturned mouth

Dorsal fin

Single dorsal fin, typically rounded to slightly elongated, positioned mid-back. In some selectively bred varieties (e.g., Sailfin Molly crosses), the dorsal fin can be significantly enlarged.

Tail fin

Caudal fin (tail fin) is typically rounded or slightly truncate.

Pectoral fin

Paired pectoral fins are small and fan-shaped, located just behind the operculum.

Distinctive fins

Males possess a gonopodium, a rod-like modification of the anal fin used for internal fertilization. Females have a fan-shaped anal fin.

Identification Tips

1. 1

   Coloration

   The most defining characteristic is its solid, deep black color, distinguishing it from other Molly varieties that have patterns or lighter hues.

2. 2

   Body Shape

   Typical molly body shape: somewhat stout and laterally compressed. Males are generally more slender than females.

3. 3

   Gonopodium (males)

   Males can be identified by their modified, pointed anal fin (gonopodium), which is absent in females.

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