There are three species in
this genera, P.
P. cristata and the more well known P. lyra
with the first two being described bySousa
and Py-Daniel (2005).Description:
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. outwards following expansion
of process. Dorsal and pectoral spines strongly ossified.
Dorsal spine pentagonal in cross-section with longitudinal
groove along each lateral side, serrate along basal
portion of anterior margin, posterior margin smooth.
Pectoral spine well developed, depressed and curved,
its tip usually reaching anal-fin origin. It is usually
found in places with accumulated organic debris, like
dense meshes of roots of floating macrophytes that
are abundant in rivers with turbid water. Specimens
also can be found among submersed leaf litter and
among root mats of riparian plants, like Symmeria
paniculata (Polygonaceae). Aquarium Care:
Predominantly nocturnal, and spends most of day time
sheltered among submersed root mats or buried in sand.
Diet: Will eat most prepared foods
such as sunken flake and tablet foods but has a liking
for frozen bloodworm.
Amazon River basin, Peru and Brazil. Type
locality: Amazon. Described in more detail
in Cope (1872a: 273, pl. 5, figs. 1a–1c), with
locality as Ambyiacu River, Ecuador (now Peru).
Sousa, L.M. and L.H.
2005 Description of two new species of Physopyxis
and redescription of P. lyra (Siluriformes: Doradidae).
Neotrop. Ichthyol. 3(4):625-636. ScotCat
181. July 2011. Ferraris, C.J. Jr.,
2007. Checklist of catfishes, recent and fossil (Osteichthyes:
Siluriformes), and catalogue of siluriform primary
types. Zootaxa 1418:1-628.