Calegari, Lehmann A. & Reis, 2011
a new species described in 2011, is from the Río Piribebuy,
(hence the species name) a tributary to the Río Paraguay
basin, Cordillera, Paraguay. It is distinguished from O.
marapoama mainly by having a continuous mid-dorsal series
of 17-18 lateral plates, a robust levator crest in the hyomandibula,
naked areas in the abdomen, an unpigmented circular blotch on
the median portion of the lower lobe, and by several features
related to sexual dimorphism.
In the Baench Catfish Atlas no.1
2005 by Hans-Georg Evers and Ingo Seidel this species was
undetermined of Genera at the time along with two other
species and was given the code number of LG2 (Loricariidae
Genus 2). It wasn't until the same year that the new genus
was formed with the type species of Otothyropsis marapoama
Ribeiro, Carvalho & Melo, 2005 from the Rio Tietê,
a river from the upper Rio Paraná basin in southeastern
This new taxon belongs to a clade
also encompassing the genera Schizolecis, Otothyris
and Pseudotothyris. Otothyropsis marapoama
is hypothesized to be the sister-group of Pseudotothyris
and Otothyris based mainly on the presence of several
derived characters of the
swim bladder capsule and associated bones. Several paedomorphic
characters shared by Pseudotothyris and Otothyris
and their significance for the phylogenetic position of
the new genus are discussed in the paper by Ribeiro, A.C.,
M. Carvalho and A.L.A. Melo, 2005.
= feeding on
= pair with
female to left.
The first part of the name is from Greek
(otos = ear and thyris = window) and is in reference to the Hypoptopomatinae
genus Otothyris, to which the new taxon is closely related.
The second part is from the Greek (opsis = relating to sight and
appearance); hence, resembling a hypoptopomatine fish. Gender:
There is at the moment (Jan.2018) five
species in this genera and including our factsheet of the month
the rest are Otothyropsis alicula Lippert,
Calegari & Reis, 2014 from the Rio Santo Antônio basin,
a tributary to Rio Sapucaí, itself a tributary to the upper
Rio Grande, Rio Paraná basin in Brazil, Otothyropsis
biamnicus Calegari, Lehmann A. & Reis, 2013
from tributaries to the Rio Iguaçu, in Santa Catarina and
Paraná States, and to the Rio Tibagi, Paraná State,
both in the Rio Paraná basin, Brazil, Otothyropsis
marapoama Ribeiro, Carvalho & Melo, 2005, the
type species from Rio Tietê basin in Brazil and Otothyropsis
polyodon Calegari, Lehmann A. & Reis, 2013 from
tributaries to the Rio Verde, a tributary to the upper Rio Paraná
basin in Mato Grosso do Sul, Brazil.
Dorsal spines (total): 2; Dorsal soft
rays (total): 7; Anal soft rays: 6; Vertebrae: 26 - 27. Distinguished
from other species of the genus by having the following characters:
middle series of lateral plates truncated two plates before the
caudal fin; inner margin of the pectoral-fin spine smooth, with
no serrae; distal margin of the accessory flange of the first
ceratobranchial pointed; mid-dorsal lateral series with 17-18
plates and continuous; abdomen usually with unplated areas anteriorly
in adults; and males with pre anal length 63.0-66.8% HL and 19-20
middle lateral plates.
Ground colour of dorsal surface of head and
body light to median brown, darker laterally on flanks; mostly unpigmented
ventrally, except for light brown caudal peduncle and ventral portion
of cheek and rostral plates. One sinuous light stripe from snout
tip to each nostril, continuing as thin line through upper margin
of orbit and compound pterotic. Two inconspicuous lighter stripes
on each side of predorsal region and flanking dorsal fin. Fin membranes
hyaline with dark brown chromatophores arranged in irregular transverse
bands on rays. Caudal fin with four or five transverse bands of
dark pigmentation, both on rays and membrane, stronger on base and
lower lobe, sometimes imperceptible on upper. Bands on caudal fin
sometimes merging to form mostly dark lower lobe. One irregularly
shaped, unpigmented area on middle of two or three lowermost branched
rays usually conspicuous.
Treat as with all members
of the Hypoptopomatinae such as the Otocinclus/Parotocinclus
genera with a planted aquarium and an overall cooler temperature.
Can be kept with smaller species such
as small characins, dwarf cichlids, small labyrinth species and
also other small catfish such as Corydoras and the smaller
members of the Loracariids.
The eggs are laid on plant leaves and other
aquarium furniture. Provide a sponge filter in a
small tank if intending to breed as a power filter will suck the
fry into it.
Females will get decidely
Omnivore: algae, tablet foods, flake and
small frozen foods.
Line of enlarged pores extending posteriorly from
the mouth corners.
Median: Middle or towards the midline.
Clade: A group defined by at least one shared derived
character or synapomorphy inherited from a common ancestor;
a monophyletic higher taxon, a branch on a cladogram.
Taxon: According to the Code, any formal
taxonomic unit or category of organisms (species, genus,
family, order, class, etc.). Taxa (pl.).
Swim bladder: The air sac that gives fish
buoyancy and balance. Acts as sound resonator in some fish.
Anal fin: The median, unpaired, ventrally
located fin that lies behind the anus, usually on the posterior
half of the fish.
Dorsal: The primary rayed fin(s) on top
of the body.
Caudal fin: The tail.
Pectoral fin: The paired fins just behind
From the Aruac name of the fish.
orestis: A mountaineer.
Calegari, B.B., P. Lehmann A. and
R.E. Reis, 2011. A new species of Otothyropsis (Siluriformes:
Loricariidae) from the rio Paraguay basin, Paraguay. Neotrop.
Froese, R. and D. Pauly. Editors. 2017.FishBase.
World Wide Web electronic publication. www.fishbase.org, ( 02/2017
Ribeiro, A.C., M. Carvalho and A.L.A. Melo, 2005.
Description and relationships of Otothyropsis marapoama, a new
genus and species of Hypoptopomatine catfish (Siluriformes: Loricariidae)
from rio Tietê basin, southeastern Brazil. Neotrop. Ichthyol.
Evers, H.-G. & I.Seidel: Mergus, Baensch
Catfish Atlas Volume 1, 1st English edn., 2005. Pp.944.