Type — Arthropoda.
Subtype — Crustacea.
Class — Malacostraca.
Order — Decapoda.
Superfamily — Astacoidea.
Family — Cambaridae.
Genus Orconectes — Orconectes.
To be continued…
— Orconectes (Procericambarus) punctimanus [Creaser, 1933]. “Spothanded crayfish”. Missouri and Arkansas. 4-8 cm. The most distinctive feature of this crayfish is the presence of a black spot on each claw at the base of the movable finger. The carapace is reddish-brown or olive-brown, with a narrow, crescent-shaped dark stripe in the lower region of the head, practically at the junction with the abdominal section. The crescent is always outlined in dark green or black. The abdomen is olive-green, with bright red areas in all segments. The claws, carapace, and abdomen are without dots or dark spots.
— Orconectes quadruncus [Creaser, 1933] — St. Francis River crayfish. “St. Francis River crayfish”. Up to 5 cm. These are medium-small brown crayfish, with spots and black dots on the dorsal surface of the body and claws, and with numerous dots on the abdomen. The claws are often edged with red, and it can also run along the entire contour of the claws, with hairs (settae) in the space at the base of the fingers.
Keeping them in the same aquarium with small snails, shrimp, bottom-dwelling aquarium fish is not recommended, as well as with other Orconectes crayfish species. It lives in burrows, digging them in gravel below rocks. In terms of diet, they prefer animal food (insect larvae, earthworms and mealworms, pieces of frozen seafood); scalded spinach, boiled carrots, and dried nettles must be included in the diet. Water temperature 22-24°C; pH 6.5-7.8; dH at least 10°.
— Orconectes williamsi [Fitzpatrick, 1966] — William’s crayfish. “William’s crayfish”. USA, Arkansas. 5 cm in length. This is a small crayfish without bright colors and spots. Its most distinctive feature is a Roman amphora very clearly outlined in light yellow on the dark olive-brown carapace. The claws are wide and powerful, looking quite threatening. Keeping them in the same aquarium with small snails, shrimp, bottom-dwelling aquarium fish is not recommended, as well as with other Orconectes crayfish species.
It lives in burrows in substrate consisting of gravel or sand at the foot of rocks. In terms of diet, crayfish prefer animal food; it is mandatory to include scalded spinach, boiled carrots, and dried nettles in the diet. In addition, it is recommended to feed them with dry fish food in the form of flakes during molting. Water temperature 22-24°C; pH 6.5-7.8; dH at least 10°.
Procambarus clarkia, Red swamp crayfish.
Orconectes macrus, palmeri, peruncus. 
