The Neotropical catfish genus
Tympanopleura, previously synonymized within
Ageneiosus, is revalidated and included species
are reviewed. Six species are recognized, two of which
are described as new. Description:
Tympanopleura is distinguished from Ageneiosus
by having an enlarged gas bladder not strongly encapsulated
in bone; a prominent pseudotympanum consisting of
an area on the side of the body devoid of epaxial
musculature where the gas bladder contacts the internal
coelomic wall; short, blunt head without greatly elongated
jaws; and smaller adult body size. Species of Tympanopleura
are distinguished from each other on the basis of
unique meristic, morphometric, and pigmentation differences.
Ageneiosus melanopogon and Tympanopleura
nigricollis are junior synonyms of Tympanopleura
atronasus. Tympanopleura alta is a junior
synonym of Tympanopleura brevis. A lectotype
is designated for T. brevis. Ageneiosus
madeirensis is a junior synonym of Tympanopleura
rondoni. Tympanopleura atronasus, T.
brevis, T. longipinna, and T. rondoni
are relatively widespread in the middle and upper
Amazon River basin. Tympanopleura cryptica
is described from relatively few specimens collected
in the upper portion of the Amazon River basin in
Peru and the middle portion of that basin in Brazil.
Tympanopleura comprises species of small
to medium sized auchenipterids, ranging in maximum
size from about 50 mm SL (T. piperata) to
160 mm SL (T. rondoni). Body widest at pectoral-fin
origin, moderately to strongly compressed posteriorly.
Dorsal and ventral aspects of body gently tapered
posteriorly, greatest body depth at base of dorsal
fin. Head moderately depressed, dorsal profile gently
sloping upward to anterior margin of supraoccipital,
inflected more acutely to dorsal-fin origin (Walsh,
Stephen J. et al)
Transparent Hammerhead cat
Walsh, S.J., F.R.V.
Ribeiro and L.H.R. Py-Daniel, 2015. Revision
of Tympanopleura Eigenmann (Siluriformes: Auchenipteridae)
with description of two new species. Neotrop. Ichthyol.