Phylum — Arthropoda.
Subphylum — Crustacea.
Class — Malacostraca.
Order — Decapoda.
Superfamily — Palaemonoidea
Family — Palaemonidae.
Genus — Euryrhynchus.
— Euryrhynchus amazoniensis [Tiefenbacher, 1978]. “Blue Banded shrimp”, “Blue Zebra shrimp”, “Peru Zebra shrimp”. Belong to the family Euryrhynchidae. These crustaceans inhabit the waters of the Amazon basin in Brazil, Peru, and the Guianas. They inhabit slow-moving waters with abundant vegetation. Up to 3 cm. They have massive, elongated claws with abundant hairs.
These claws are larger in males. Fortunately, they are harmless to other crustaceans. Coloration can vary from yellowish or light brown tones, turning to bluish or being almost transparent, with black pigmentations, sometimes forming characteristic lines along the body length, especially in the dorsal zone.
They are very peaceful crustaceans despite their long claws. They are quite shy and spend most of the day hiding under logs or among aquarium vegetation. They are more active at night. Water is slightly acidic, slightly alkaline, oxygen-rich. Optimum temperature is 24-29°C. Long-term keeping of shrimps at the upper temperature limit can cause a loss of reproductive capacity, often irreversible. They feed on decaying organic debris. There is a high mortality rate during transportation and acclimatization, and they are frequently prone to fungal infections.
Superfamily — Atyoidea
Family — Atyidae.
Genus — Halocaridina.
— Halocaridina rubra [Holthuis, 1963] — Hawaiian Red Shrimp. “Hawaiian Red Anchialine Pond Shrimp”, “Hawaiian Red shrimp”, “Hawaiian Volcano shrimp”, “Anchialine shrimp”, “Opae ula”, “Amazing Hawaiian Micro Lobsters”. Hawaiian Islands. Up to 1.5 cm. Very small black eyes. In adults, the carapace is red, especially in dominant males. Peaceful and schooling. When frightened, they change color and camouflage with the environment. Since they are very small, it is best to keep them in a species aquarium. Lives in both fresh and saltwater. Substrate should be made of coral sand, crushed coral, or lava with a high calcium content.
They are mostly nocturnal, but if they feel safe, they can often be seen swimming during the day. Hard, brackish water is required for keeping them. For breeding, they need hard saltwater up to 12‰. They feed on algae growth. Especially important is sufficient algae growth in the aquarium with living organisms settling in them. Under optimal conditions, females carry mostly 5-10 eggs for about 38 days, 3 to 5 times a year. Water temperature 20-23°C, but can withstand 15 to 30°C. pH 8.2-9.0. Lifespan is 8-10 years.
This is a shrimp of extremes. It can survive in a very hostile environment — temperature values, salinities ranging from fresh to marine water, lack of food for many months or years, 
oxygen deficiency, nitrogenous compounds and other substances fluctuating between extreme permissible limits. After millions of years of evolution, these shrimps have adapted to these conditions and become “super shrimps”. Moreover, they are expected to live for more than 20 years if good conditions are provided! Unfortunately, this small shrimp is currently abused by being sold in tiny, spherical, completely sealed glass vessels called “ecospheres”. The companies that sell them report that they are selling a fully functioning ecosystem with shrimp and marine algae supporting each other. However, this is a sad and actual lie used by these companies for profit and to the detriment of these wonderful animals.
The truth is that these shrimps slowly die in those containers due to lack of food and oxygen and the accumulation of shrimp waste. This type of container would kill any other shrimp within days, but it takes 1-3 years for Hawaiian Red Shrimps to finally die because they have developed such physiology. During the torture of those 1-3 years, they actually molt every time due to lack of food, which means they are essentially consuming their own bodies. Hawaiian Red Shrimps need as much space as any other shrimp to thrive and reproduce.
Genus — Xiphocaris.
— Xiphocaris elongata [Guerin-Meneville, 1855] — Yellow Nose Shrimp. “Yellow Nose Shrimp”, “Yellow Rhino Shrimp”. 2.5-4.0 cm. Native to the Caribbean coast, where they can be found in the mouth of almost every river or stream. The body is transparent, allowing internal organs to be seen. Similar to the Asian shrimp Caridina gracilirostris, but has a long yellow rostrum (nose), and can sometimes have a red tint. This shrimp is highly adaptable.
Completely harmless, can be kept with non-aggressive fish and shrimps. Can be kept in both acidic and alkaline water. Can also live in hard water with quite high salinity. This very attractive shrimp has the same requirements as the Asian Caridina species. Salty marine water is required for breeding. pH 7.5-8, gH: 6-9, temperature 22-28°C.
Keeping and care of filter-feeding shrimps.
Atyaephyra desmaresti, Alpheus cyanoteles, Dugastella valentine. 
