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Diagnostic Description

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Hisonotus megaloplax differs from its congeners by the arrangement of abdominal plates,which is composed by greatly enlarged lateral abdominal plates, which contact each other at the belly midline, without a median abdominal series or with a single triangular plate located posteriorly. All other species of Hisonotus, with the exception of Hisonotus montanus, possess a complete median series between the lateral abdominal plates or a naked area between them. This feature is polymorphic in H. montanus, some individuals having enlarged lateral abdominal plates contacting at the midline and leading to misidentification. Hisonotus megaloplax is further distinguished from Hisonotus montanus by the caudal-fin color pattern which is almost completely dark vs. color pattern composed by vertical dark stripes, and by the infraorbital canal entering infraorbital series via sphenotic vs. infraorbital canal entering infraorbital series via compound pterotic (Ref. 80996).
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i18n: Recorder
Frédéric Busson
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Morphology

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Dorsal spines (total): 2; Dorsal soft rays (total): 7; Anal spines: 1; Analsoft rays: 5
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Frédéric Busson
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Threats

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Not Evaluated
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i18n: Recorder
Frédéric Busson
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Trophic Strategy

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The arroio Caraguatá at the type-locality is a small watercourse with slow to median flow of clear to brown waters running over stones, vegetal litter, and sandy bottom. The species inhabits marginal submerged vegetation composed mainly by grass. See Câmara & Hahn (2002) for detailed description of arroio Caraguatá and its fish fauna. Recent collection efforts failed to capture this species in the headwaters of rio Passo Fundo, near the city of Passo Fundo. The construction of a dam (Barragem da Fazenda da Brigada) and the pollution caused by sewer rejects from the urban area of Passo Fundo seems to be the cause of the disappearance of this species in that region (Ref. 80996).
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cc-by-nc
copyright
FishBase
i18n: Recorder
Frédéric Busson
original
visit source
partner site
Fishbase