Critically Endangered
Cynolebias constanciae
Cynolebias constanciae
Simpsonichthys constanciae is a killifish from the family Rivulidae that is endemic to Brazil.
The killifish
It is a small killifish that is up to 6 cm (2.4 in) in total length.
New World rivulids include annual killifish that survive a dry season as eggs in mud, and non-annual forest-stream forms.
Killifish, livebearers, and splitfins — small-bodied freshwater fishes, many of them from a single lake, spring, or seasonal pool.
Range and habitat
Simpsonichthys constanciae is a killifish from the family Rivulidae that is endemic to Brazil. It is restricted to temporary freshwater habitats (like ponds) in the São João basin in Rio de Janeiro, while all other species in the genus are from Bahia.
Pins are Wikidata “endemic to” fields. Orange dots, when present, are GBIF occurrence tiles — survey bias included.
Breeding
Annual rivulids hatch, breed, and die in one wet season; the eggs wait in the mud. Non-annual species live in forest streams year-round.
Small desert or forest fishes in this order live in water that can vanish. The egg bank, if there is one, is the only reserve.
In crisis
Cynolebias constanciae is Critically Endangered on this catalog because that is the IUCN category stored on Wikidata. Confirm the official criteria and any later count on iucnredlist.org.
Sources
Written for this catalog from the English Wikipedia article on Cynolebias constanciae — often a short stub, Wikidata item Q307112. Family and order context is original field-guide writing about the group, not a copied assessment of this one species. Wikipedia text is CC BY-SA. Not an IUCN assessment. Counts, when quoted, can change — confirm them on the recovery programme and on iucnredlist.org.
