A new genus has been erected,
Rhinotocinclus, (2022) with the type species
of Parotocinclus longirostris Garavello,
1988. Abstract: A new genus of Hypopopomatinae
armored catfish is described from the northern portions
of South America, namely the Amazon, Orinoco and Guianan
coastal drainages. The new genus is diagnosed from
all remaining hypoptopomatines by having the canal
cheek plate on the ventral surface of the head posteriorly
elongated and contacting the cleithrum, in addition
to other features that distinguish the new genus from
specific genera. Five new species are described and
18 species currently allocated in Parotocinclus,
Hisonotus, and Curculionichthys
are transferred to the new genus and rediagnosed.
Parotocinclus amazonensis and P. aripuanensis
are considered junior synonyms of P. britskii.
The secondary sexual dimorphism of the members of
the new genus is detailed and illustrated. Morphological
characters are used to delimit four phenotypic groups
of species that might have phylogenetic significance,
which still have to be properly tested. A key to the
species is offered and diagnoses, illustrations, and
distribution maps are provided for all species (Reis
& Lehmann 2022).
Description: Rhinotocinclus hera
was originally described as Curculionichthys hera,
and accordingly was compared to other species of Curculionichthtys.
Remarkably, the authors distinguished the new species
from congeners, except C. jumaorum (originally
described as Hisonotus) and C. karipuna
Silva, Roxo, Melo & Oliveira, 2016, by possessing
a single rostral plate (vs. paired rostral plates);
and except C. jumaorum and C. sabaji
Roxo, Silva, Ochoa & Oliveira, 2015, by having
darkened tooth-crowns (vs. hyaline to light yellow
tipped teeth). As demonstrated in the present study,
both C. hera and H. jumaorum, belong
to Rhinotocinclus and the single rostral
plate and brown tooth crown are typical of its species.
Rhinotocinclus hera was tentatively categorized
as Least Concern (LC) by Gamarra et al., (2019) in
the original description (Reis
& Lehmann 2022).
Etymology: Rhinotocinclus masc.,
from the Greek (Rhinos), beak, snout and Otocinclus,
a genus of Hypoptopomatinae, in allusion to the conspicuous
and elegant snout of most of its species. The specific
epithet hera from the Latin hera, meaning
mistress of the house, lady, or queen, in allusion
to the larger size of the females relative to males.
A noun in apposition. Remarks:
Most online searches at the moment (2022) will still
give you the old genus name of Curculionichthys
Occurs in creeks tributary to the Rio Curuá-Una,
a small river draining to the Amazon immediately east
of the town of Santarém, Pará State,
Brazil. Type locality: Igarapé
do Onça, tributary to Rio Curuá-Una
on road BR-163 between Belterra and Rurópolis,
Belterra, Pará, Brazil, 03º33’35.3”S
54°52’09.2”W, elevation 80 m asl.
Gamarra, Suelen P.,
Calegari, Bárbara B., Reis, Roberto E.
(2019): A new species of Curculionichthys (Siluriformes:
Loricariidae) from the north edge of the Brazilian
Shield, lower Amazon basin. Neotropical Ichthyology. Global
Biodiversity Information Facility
Reis RE, Lehmann A. P. A new genus of armored
catfish (Siluriformes: Loricariidae) from the Greater
Amazon, with a review of the species and description
of five new species. Neotrop Ichthyol. 2022.