Ryan Photographic - Rhynchocinetidae - Hingebeak shrimps
The family Mysidae is the most speciose of the crustaceans with 942 species in 93 genera. The family is widely distributed in diverse habitats, ranging from isolated freshwater cave systems to lakes, rivers, coastal waters and the deep sea. They are called opossum shrimps because the females carry eggs and developing young in a marsupium (pouch). Mysids are often important components of their ecosystems and can occur at very high densities.
Mysids can easily be distinguihsed from true shrimps as they lack a rostral spine (a projection from the carapace that usually extends beyond the eyes).
Tenagomysis novaezealandiae, New Zealand Opossum shrimp
Tenagomysis novaezealandiae, (Family Mysidae), Ashley River mouth, New Zealand - 1958
Tenagomysis novaezealandiae, Ashley river mouth, near Kaiapoi, New Zealand -2005