Order Cyprinodontiformes ( Cyprinodontiformes )
Suborder Cyprinodontoidei ( Cyprinodontoidei )
Family Poeciliidae ( Poeciliidae )
Subfamily Poeciliinae ( Poeciliinae )
Genus Phallichthys — Phallichthys.
— Phallichthys amates — Phallichthys amates [Miller, 1907]. Synonym: Phallichthys pittieri, Poecilia amates, pittieri, Poeciliopsis isthmensis. (Eng. Merry Widow Livebearer). Guatemala, Panama, Honduras, Costa Rica. Male 4, female 6 cm. Olive with a bluish tint and shiny scales, a black stripe through the eyes. On the sides 6-8 dark strokes, belly yellow. The dorsal and anal fins of the males are decorated with orange color, they can become bright red if fed with foods containing carotenoids. The male has a very long gonopodium.
Known subspecies: — P. amates pittieri. Found in mountain streams up to 1200 m above sea level. Male up to 5, female up to 8 cm.
Aquarium with dense vegetation, driftwood and decorations to create shelters. Peaceful. There is a clear hierarchy among males. Dense vegetation is necessary so that the fry can hide there. Diverse nutrition is required, consisting largely of live food, but also requires vegetable food. Female matures at 6 months, male at about 1 year of age. After 30-35 days, the female gives birth to 40-60 fry. T 22-24°C; dH 8-20°; pH 6.0-7.2.
— Phallichthys fairweatheri — Phallichthys fairweatheri [Rosen & Bailey, 1959]. (Eng. Picotee Livebearer). Guatemala, Belize, Mexico, Honduras. Male 3.5 cm, female 5 cm. Olive-gray to dark green, with a blue sheen and 4-5 black transverse strokes. Fins yellow-orange, dorsal fin with a dark and white border. Anal and caudal fins are orange. Very greedy for food, so they need to be fed 5 times a week, arranging fasting days. Reach sexual maturity in about 6-8 months. Reach sexual maturity in about 6-8 months. On the 24th-28th day, the female gives birth to 15-30 fry 5 mm in size. dH 10-25°; pH 6.5-7.5; T 24-29°C.
— Phallichthys quadripunctatus — Phallichthys quadripunctatus [Bussing, 1979]. (Eng. Fourspot Toothcarp). Costa Rica, Sixaola River. Male 2 cm, female up to 3.5 cm. Gray-yellow with 3-5 round black spots on the body. Dorsal fin bluish with a smoky border. Aquarium with dense vegetation and size-compatible peaceful neighbors. Does not like high temperatures. Females produce offspring every 4 weeks with 10-15 fry. pH 6.4-7.3; T 18-23°C.
— Phallichthys tico — Phallichthys tico [Bussing, 1963]. Costa Rica, Río San Juan River. Male 2.5 cm, female 3.5 cm. Body shape is noticeably thinner than in other members of the genus Phallichthys. Beige-brown with bluish fins. In males, the dorsal fin has two black stripes, one at the base and a wide one at the very top. On the sides 8-10 dark strokes, especially noticeable in males and juveniles. Males have a relatively long gonopodium, which reaches almost to the caudal fin.
Keep in groups of 10 or more in a species aquarium due to their small size. Very shy, spending most of their time among plants. Adult fish have a small mouth, so food should be chosen accordingly, with a clear preference for plant-based food. T 24-29°C. dH 3-10°; pH 7.0-7.5; T 23-30°C.
Poeciliopsis gracilis, Poeciliopsis hnilickai, Poeciliopsis turneri.
Phalloceros caudimaculatus, Dappled-tail loricariid. 
