Down Cat-eLog Data Sheet
Scientific Name Physopyxis lyra  Cope, 1872
Common Name
Type Locality Río Ampiyacu, Peru.
Down Species Information
Size 35mm or 1.4" SL. Find near, nearer or same sized spp.
Identification Physopyxis can be distinguished from the other Doradidae by the miniature size (adults generally less than 31 mm SL) and a unique combination of additional features: extreme development of the exposed pectoral girdle; well developed coracoid process longer than the postcleithral process; anterior plate of the nuchal shield absent; dorsal spine serrated only along the basal portion of its anterior margin; two infraorbital bones in young that become fused into a single plate in adult specimens; pectoral spine reaching to base of anal fin.

Physopyxis lyra differs from the other species of the genus by possessing a single row of spines on the lateral plates and a strong scapular girdle with long, broad coracoid processes having distal tips enlarged and divergent.
Down Habitat Information
Distribution South America: Amazon and Essequibo River basins.
Amazon, Upper Amazon, Ampiyacu (click on these areas to find other species found there)
Amazon (click on these areas to find other species found there)
Guyana Waters, Coastal Rivers of Guyanas, Essequibo (click on these areas to find other species found there)

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IUCN Red List Category Not Evaluated
Temperature 23.0-26.0°C or 73.4-78.8°F (Show species within this range)
Down Husbandry Information
Feeding A nocturnal scavenger. The best way to ensure this fish is properly fed is to introduce sinking food into the tank after dark. Most foods would be accepted gluttonously. Individuals will gorge themselves on food to the point of appearing fit to burst.
Furniture Usually found in places with accumulated organic debris, like dense meshes of roots of floating aquatic plants. Specimens also can be found among submersed leaf litter and among root mats of river bank plants. Aquarium observations indicate that P. lyra is predominantly nocturnal, and spends most of day time sheltered among submersed root mats or buried in sand.
Compatibility Peaceful and small, would be perfect with anything that wouldn't consider it food.
Suggested Tankmates Due to its diminutive size tank mates should be relatively small, Apistogramma species are found in the same habitat.
Breeding Unreported in the aquarium.
Breeding Reports There is no breeding report.
Down Further Information
Reference Proceedings of the Academy of Natural Sciences of Philadelphia v. 23, pp 273, Pl. 5 (figs. 1a-1c).
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Last Update 2020 Sep 28 06:10 (species record created: 2006 Aug 01 08:50)