Scientific and trade names
Three unrelated fish are sold as algae eaters. Common pleco covers species whose adult sizes differ by twenty centimetres. Brunei beauty is two Betta species with opposite water requirements. In each case the name a buyer researches is not reliably the animal they take home.
Short answer
A trade name tells you what a shop calls an animal. A scientific name tells you which animal it is. They agree often enough that the disagreements are dangerous.
The four ways a name goes wrong
The fourth is the mildest and the most common. A genus change breaks a search rather than a tank, which is why AquariumHQ indexes superseded names alongside accepted ones — the name on the shop label is the one a keeper will type.
| Failure | What happens | Example |
|---|---|---|
| One name, several species | The name covers unrelated animals with different requirements | Jewel cichlid — two Hemichromis differing in size and water chemistry |
| A genus sold as a species | The label names a group and the fish varies within it | Peacock cichlid — the whole Aulonocara genus, and a South American piscivore |
| An unresolved complex | Several undescribed forms travel under one binomial | Rabbit snail — trade Tylomelania that do not resolve to accepted species |
| A superseded binomial | The accepted name has moved and the shop label has not | Rainbow shark — labelled Epalzeorhynchos frenatum, accepted as frenatus |
Why the catalogue sometimes refuses to pick
Where a name resolves to more than one record, AquariumHQ declares the ambiguity rather than choosing silently. A search box that picks one of three animals and says nothing has made a decision on the reader's behalf in exactly the situation where the decision matters most.
Each declaration states what the name can refer to and what the consequence of guessing wrongly is. That second part is required: 'this name is ambiguous' is a disclaimer, whereas 'this name is ambiguous and one of the animals it refers to reaches half a metre' is information.
Checking an identity yourself
- Start from the scientific name, not the common one. Every organism page carries the accepted binomial, the authority where known, and any synonyms the animal has been published under.
- Search the binomial in a taxonomic backbone rather than in a retail listing. An exact match to an accepted species usage is a meaningful check; a fuzzy match to something similar is not.
- Treat a genus-only name as unresolved rather than as an answer. 'Tylomelania sp.' is an honest label and it is not an identification.
- Be most careful where congeners overlap in the trade: juveniles, colour morphs and line-bred forms are where confident identification most often fails.
Names that changed under the catalogue
Taxonomy genuinely moves, and a record whose name changes is the same animal rather than a new one. AquariumHQ keeps the slug stable through a rename, indexes both names, and records which source calls it what — so a keeper searching the name on a shop label from 2009 lands on the same page as one searching the current combination.
Where the change is contested rather than settled, the catalogue holds its existing name and records the disagreement. Adopting one side of a live argument by default is how a database quietly takes a position nobody reviewed.