In adults Loricaria birindellii is distinguished
from all other nominal species of Loricaria
by having a combination of an elongate dorsal-fin
spine (36.0% SL based on the holotype vs. 16–29%,
usually less than 26% SL) that is supported throughout
most of its length by the first branched ray and an
inconspicuous (vs. prominent) post-orbital notch with
minimum orbital diameter 95.4–97.2% (vs. 71.8–91.5%)
of maximum orbital diameter. It is further distinguished
from similar and geographically proximate species,
having a narrower head width (13.9–14.9% SL
vs. 15.2–19.4% SL in L. simillima and
16.4–20.1% SL in L. lata), from L. clavipinna
by having more divergent plates (21 vs. 18–19)
and fewer coalesced plates (13 vs. 15–16) in
the lateral series, and from L.
cataphractta by having weakly
(vs. strongly) developed odontode crests on head and
dorsal trunk plates, more divergent plates (21 vs.
17–20, usually 19) and fewer coalesced plates
(13 vs. 13–17, usually 15–16) in the lateral
The authors caught this new species downstream of
a cataract in clear water approximately one to two
metres deep and with a moderate current. The substrate
was predominantly sand with patches of bedrock and
large lateritic boulders.
Altamira Municipality, Rio Curuá, Iriri-Xingu
drainage, near town of Castelo dos Sonhos.
Froese, R. and D. Pauly.
Editors. 2014. FishBase. World Wide Web electronic
publication. www.fishbase.org, ( 08/2014 ). Thomas, M.R. and M.H.
2010. A new species of whiptail catfish, genus Loricaria
(Siluriformes: Loricariidae), from the Rio Curua´
(Xingu Basin), Brazil. Copeia 2010(2):274-283.