All FishesCALLICHTHYIDAECallichthyinaeDianema  |  | 

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Scientific NameDianema longibarbis    Cope, 1872
Common NamesPorthole Catfish
Malet Pansermalle (Denmark), Schwielenwels (Germany)
Type LocalityRío Ambyiacu, Peru.
Synonym(s)Callichthys adspersus, Decapogon adspersus, Decapogon verissimi
Pronunciationdie ah NEE mah
EtymologyDianema: From the Greek di-, meaning two and nema, meaning filament; in reference to the long maxillary barbels. Named after the genus Callichthys, which refers to the armour plates (Callum = hard skin; ichthys = fish) found in all members of this family.
Hop to next section Species Information
Size82mm or 3.2" SL. Find near, nearer or same sized spp.
SexingIn Dianema, Hoplosternum and Megalechis (but not in Callichthys), medial expansions of the coracoid bones are especially developed, covering most of the skin between the pectoral fins and sometimes overlapping at the midline in fully developed mature males (vs. not fully covering the abdominal skin and not overlapping in females). Mature males of Callichthys, Dianema, Hoplosternum, Lepthoplosternum, and Megalechis have a thick adipose body on the ventral surface of the pectoral fin. Mature females of Dianema, Hoplosternum and Megalechis have a small fold of skin on the external face of the leading pelvic-fin ray.

In Dianema, Hoplosternum and Megalechis (but not in Callichthys), medial expansions of the coracoid bones are especially developed, covering most of the skin between the pectoral fins and sometimes overlapping at the midline in fully developed mature males (vs. not fully covering the abdominal skin and not overlapping in females). Mature males of Callichthys, Dianema, Hoplosternum, Lepthoplosternum, and Megalechis have a thick adipose body on the ventral surface of the pectoral fin. Mature females of Dianema, Hoplosternum and Megalechis have a small fold of skin on the external face of the leading pelvic-fin ray.
Hop to next section Habitat Information
DistributionSouth America
Amazon (click on these areas to find other species found there)
Amazon, Upper Amazon, Ampiyacu (click on these areas to find other species found there)

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IUCN Red List Category
Least Concern
, a distribution map is available on the IUCN species page. Last assessed 2020.
pH5.8 - 7.8
Temperature24.0-28.0°C or 75.2-82.4°F (Show species within this range)
Other ParametersA hardy species that will adapt to most conditions.
Hop to next section Husbandry Information
Breeding ReportsThere is no breeding report.
Hop to next section Further Information
ReferenceProceedings of the Academy of Natural Sciences of Philadelphia v. 23, pp 276, Pl. 7 (figs. 1, 1a-b).
Registered KeepersThere is but a single registered keeper, view all "my fish" data.
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There are 4 records of this fish being seen, view them all.
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Dianema longibarbis QR codeLFS label creator
ARN ref:1.1.55.280
Last UpdateFri Nov 04, 2022 10:03 am (Species record created: Thu Jan 01, 1970 1:00 am)