The genera Parastegophilus
and Pseudostegophilus have lacked adequate
phylogenetic definition, and the species originally
described in Homodiaetus (e.g., H. haemomyzon)
and Pseudostegophilus (e.g., P. paulensis)
have been serendipitously moved between both genera,
highlighting uncertain and different classification
criteria throughout their taxonomic histories. The
most recent concept of Pseudostegophilus,
albeit not explicitly defined (de Pinna and Wosiacki,
2003), is proposed here to include in its synonymy
the genus Parastegophilus, based on three
unique synapomorphies shared by all species currently
assigned to both genera. Pseudostegophilus maculatus
enters the gill chamber of
Luciopimelodus pati and
feeds on the gills. Not
recommended for the home aquaria with other fish but
if kept would do better on its own with its own kind.
There is a patch of about seven
thorn-like opercular spines and another patch of approximately
nine interopercular spines.
These are erectile, and by first
erecting these on one side and then those on the opposite
side, the fish is able to inch its way
forward into narrow openings. The sub-family
Stegophilinae have sucking mouths
with which they can hang on to the bodies of other
Difficult to feed with aquarium made foods as this
is a species that feeds of fish, scales and body mucus
so certainly a catfish
for the specialist. Remarks:
DoNascimiento, C. (2015):
has placed Parastegophilus in the synonymy
South America: Lower Paraná and Uruguay River basins,
Argentina. Type locality: La Plata,
Prov. of Buenos Aires, Argentina.
de Pínna, M.C.C.
and W. Wosiacki,
2003. Trichomycteridae (pencil or parasitic catfishes).
p. 270-290. In R.E. Reis, S.O. Kullander and C.J.
Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes
of South and Central America. Porto Alegre: EDIPUCRS,
Brasil. Froese, R. and D. Pauly. Editors.
2006. FishBase. World Wide Web electronic publication.
www.fishbase.org, version (02/2006). Ferraris, C.J. Jr., 2007. Checklist
of catfishes, recent and fossil (Osteichthyes: Siluriformes),
and catalogue of siluriform primary types. Zootaxa
1418:1-628. Catfish Association Great Britain.
Volume1. 1983. DoNascimiento, C. (2015): Morphological
evidence for the monophyly of the subfamily of parasitic
catfishes Stegophilinae (Siluriformes, Trichomycteridae)
and phylogenetic diagnoses of its genera. Copeia 103
(4): 933–960. www.pecescriollos.de/en/pseudostegophilus-maculatus-comb-nov-from-parastegophilus. U.S. Fish & Wildlife Service
2018. Pseudostegophilus maculatus (a catfish, no common
name). Web Version, 4/4/2018.