e are back to the South American sub-continent
for this months factsheet (October 2014) with a second look (first
April 2014, M. iheringi) at these members of the
Pseudopimelodidae family. Pseudopimelodinae is now of
course considered a full family status and is closely related
to the Pimelodidae family and as such mostly contains the smaller
pims, such as the South American Bumblebee and dwarf marbled catfishes.
There can be confusion between members
of this genera, Microglanis
poecilus, M. secundus, M.
iheringi and M. parahybae. There
are diferences in colour patterns, especially on the caudal
peduncle, caudal fin and anal fin areas.
M. poecilus |
M. parahybae |
anal fin view
Among the known species in this genera,
Microglanis cottoides (Boulenger 1891) is especially
interesting for phylogeographic and genetic population studies,
owing to its geographical distribution in the Brazilian Atlantic
Forest, being present in the Uruguay River basin and along the
eastern coast of Brazil, with records of their occurrence in drainages
across the southern and southeastern regions (Malabarba &
Mahler, 1998; Shibatta, 2003b, 2007; Mori & Shibatta, 2006).
These regions can be considered of great biogeographical significance,
not only for the high degree of endemism of its fish fauna (Bizerril,
1994, 1995), but also for being a very populated area with high
environmental degradation due to human activities.
A note from Gareth Savage who keeps
this species. "They will not share a hide with anything.
I've witnessed them chasing each other around but never locking
jaws like M. heringi do. The weirdest thing I've noticed
is the dominant fish in the tank shows the most colour just like
with cichlids. I've kept small fish in the tank with them and
they have been left alone. I think they like to be fed rather
than hunt there food, though this would be with caution."
To sum up, a very nice looking pim, while
being very nocturnal, but being able to see them on the odd occasion
makes up for the weeks that you thought you had lost it, and so
a nice addition to a medium sized community tank.
Dorsal spines (total): 1; Dorsal soft rays
(total): 6; Anal soft rays: 9 - 12; Vertebrae: 30. Distinguished
from M. parahybae and M. cibelae by the longer
head (29.3-33.8% SL, versus 23.2-27.6 and 25.6-31.1 respectively)
and wide body (28.5-33.9% SL versus 23.8-27.7 and 25.4-29.8, respectively).
The smaller mouth width distinguish this species from M. eurystoma
(50.6-64.3% HL, versus 67.3-84.4).
Dark brown markings on a light brown background.
The area of dark brown colour on the caudal peduncle is crescent
shaped. Dorsal fin clear with a dark brown band. The caudal fin
has a dark brown cross band. Anal fin
sports a dark brown cross band.
Hiding places such
as rockwork, plants and or wood will benefit this species
and help, along with regular water changes, to keep this
it happy in its surroundings
cottoides is one of twenty six,
small to medium sized pims, found in this family, and as such
is a good addition to the medium sized community tank, and will
not harm the occupants unless they are small enough to fit into
its mouth such as newly born fry and young fish..
Males are slimmer than
Can be fed a varied diet of tablet food,
pellets, worm foods and frozen food such as bloodworm.
The primary rayed fin(s) on top of the body
Adipose fin: Fleshy finlike projection
without rays, behind the rayed dorsal fin.
fin: The paired
fins just behind the head.
Anal fin: The median, unpaired, ventrally located
fin that lies behind the anus, usually on the posterior
half of the fish.
Micro = small; glanis = catfish.
Malabarba, L.R. and J.K.F. Mahler
Jr., 1998. Review of the
genus Microglanis in the rio Uruguay and coastal drainages of
southern Brazil (Ostariophysi: Pimelodidae). Ichthyol. Explor.
Froese, R. and D. Pauly. Editors. 2016.FishBase.
World Wide Web electronic publication. www.fishbase.org, ( 06/2016
Ferraris, C.J. Jr., 2007. Checklist of catfishes,
recent and fossil (Osteichthyes: Siluriformes), and catalogue
of siluriform primary types. Zootaxa 1418:1-628.
Souza-Shibatta, Lenice, Ferreira,
Dhiego Gomes, Oliveira, Claudio, Almeida, Fernanda Simões
de, Shibatta, Oscar Akio, & Sofia, Silvia Helena.
(2013). Development and characterization of microsatellite loci
of Microglanis cottoides (Siluriformes: Pseudopimelodidae) and
cross-species amplification. Neotropical Ichthyology, 11(3), 581-585.
Gareth Savage: pers. comm.