Megupsilon aporus Miller & Walters, 1972
Accepted species in Catalogue of Life’s 11 September 2026 base release. This preserves the source classification and available supporting data; it is not a completed species monograph.
Open encyclopedia reference
The Catarina pupfish (Megupsilon aporus) was a diminutive species of fish in the family Cyprinodontidae, first described in 1972. It was endemic to a spring in Nuevo León, Mexico. In an attempt of saving the rapidly declining species, some were brought into captivity in the late 1980s and early 1990s, but it proved very difficult to maintain. In 1994 it became extinct in the wild. Gradually the captive populations also perished. The last male (pictured in inset) died in 2014, and the species became extinct.
In addition to its small size, it was characterized by absence of pelvic girdle and pelvic fins, novel male reproductive behavior of jaw-nudging, a darkened dorsal patch, and by having different numbers of chromosomes in male and female fish due to a recent chromosomal fusion event. In 2013, its behavior was described based on very limited field observations of the previous wild population and more detailed observations in aquaria.
Wikipedia contributors, Catarina pupfish; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T23:09:27.479421+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Megupsilon aporus Miller & Walters, 1972
- Name authority
- Miller & Walters, 1972
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Teleostei
- Order
- Cyprinodontiformes
- Family
- Cyprinodontidae
- Genus
- Megupsilon
- Extinction status
- Not supplied by this source
Source habitat flags: Marine: no · Freshwater: yes · Terrestrial: no. These do not form a complete habitat description.
Classification family tree
Nested taxonomic groups from the source. This is not a direct-ancestor chain, a dated evolutionary tree or a phylogenetic reconstruction.
- domainEukaryota (Chatton, 1925) Whittaker & Margulis, 1978
- kingdomAnimalia
- phylumChordata
- subphylumVertebrata
- infraphylumGnathostomata
- parvphylumOsteichthyes
- gigaclassActinopterygii
- superclassActinopteri
- classTeleostei
- orderCyprinodontiformes
- familyCyprinodontidae Wagner, 1828
- subfamilyCyprinodontinae Wagner, 1828
- genusMegupsilon Miller & Walters, 1972
- speciesMegupsilon aporus Miller & Walters, 1972
Close classified relatives
No other member of this genus is present in the selected snapshot.
Source literature & publication evidence
References attached to this source record, including nomenclatural citations where supplied. This is a selected bibliography; abbreviated citations remain in the source’s form.
- Miller, R. R., & Walters, V. (1972). A new genus of cyprinodontid fish from Nuevo Leon, Mexico. Contributions in Science (Los Angeles), No. 233: 1–13. https://doi.org/10.5962/p.241217 Source fields: Taxon.tsv dwc:namePublishedIn, Taxon.tsv dcterms:references
Origins, evidence & remaining research
Name authority and publication references document nomenclature where the source supplies it. They do not establish evolutionary origins or the earliest fossil occurrence.
Specimen-level evidence, morphology, ecological research, phylogenetic studies, a comprehensive bibliography and a located literary passage have not yet been compiled for this record. A suitable sourced image remains to be added.
Dataset citation & attribution
This exact taxon in ChecklistBank · Catalogue of Life 2026-09-11
Catalogue of Life 2026-09-11; dataset 316321; doi:10.48580/dgz5n. https://creativecommons.org/licenses/by/4.0/ . Retrieved 5 October 2026.
Stable key: col:3Z2M6. Classification follows source parent identifiers. English common names may vary by region.