Hypancistrus sp. "INPA 43863"

Collins, Rupert A., Duarte Ribeiro, Emanuell, Nogueira Machado, Valeria, Hrbek, Tomas & Farias, Izeni Pires, 2015, A preliminary inventory of the catfishes of the lower Rio Nhamunda, Brazil (Ostariophysi, Siluriformes), Biodiversity Data Journal 3, pp. 4162-4162: 4162

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Hypancistrus sp. "INPA 43863"


Hypancistrus sp. "INPA 43863" 


Type status: Other material. Occurrence: catalogNumber: 43863; recordedBy: Valéria Nogueira Machado; Emanuell Duarte Ribeiro; Rupert A. Collins; individualCount: 12; otherCatalogNumbers: UFAM:CTGA:14552; UFAM:CTGA:14553; UFAM:CTGA:14554; UFAM:CTGA:14555; UFAM:CTGA:14556; associatedSequences: KP772605; Taxon: scientificName: Hypancistrus; kingdom: Animalia; phylum: Chordata; class: Actinopterygii; order: Siluriformes; family: Loricariidae; genus: Hypancistrus; vernacularName: sp. "INPA 43863"; taxonRemarks: Possible undescribed species; Location: country: Brazil; stateProvince: Pará; locality: Lower Nhamunda River ; decimalLatitude: -2.19081; decimalLongitude: -56.7084; geodeticDatum: WGS84; Identification: identifiedBy: Rupert A. Collins; Event: eventDate: 2013-11; Record Level: institutionCode: INPA; basisOfRecord: PreservedSpecimenGoogleMaps 


Following Armbruster et al. (2007) and Armbruster (2008) we report the following combination of characters allowing a genus-level identification only: five rows of lateral plates on the caudal peduncle; lateral plates not keeled; dentaries forming angle of < 90°; dentary teeth almost twice as long as premaxillary teeth; dentary teeth widely spaced with medial gap between tooth cups as wide as the tooth cups themselves; supraorbital crests very distinct; dark E-shaped pattern on snout (irregular in some individuals); pattern on body of oblique dark bands (almost horizontal wavy stripes in some individuals), with dark bands generally wider than pale bands (i.e. body more dark coloured than pale coloured); dorsal fin with complete bands; and caudal fin with dark vertical bands.

The Hypancistrus  from the Nhamundá is ostensibly similar to Hypancistrus furunculus  Armbruster, Lujan & Taphorn (2007), but we hypothesise that it represents a distinct species from H. furunculus  due to the pronounced supraorbital crests, wide gap between the dentary tooth cups, and colour pattern of wide dark bands and thin pale bands. We await the description of a number of similar species from the Brazilian Shield rivers, some of which may end up being more closely related to this fish than H. furunculus  is. The species is known in the aquarium trade as Hypancistrus  sp. "L475" ( Konn-Vetterlein and Haagensen 2015)

Twelve individuals were caught by hand at night from rocky substrates (sampling site NH01). Four examples of live specimens are pictured in Fig. 17 to illustrate variation in colour pattern.