Ancistrus sp. "INPA 43862"

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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Ancistrus sp. "INPA 43862"


Ancistrus sp. "INPA 43862" 


Type status: Other material. Occurrence: catalogNumber: 43862; recordedBy: Valéria Nogueira Machado; Emanuell Duarte Ribeiro; Rupert A. Collins; individualCount: 2; otherCatalogNumbers: UFAM:CTGA:14547; UFAM:CTGA:14548; associatedSequences: KP772604; Taxon: scientificName: Ancistrus; kingdom: Animalia; phylum: Chordata; class: Actinopterygii; order: Siluriformes; family: Loricariidae; genus: Ancistrus; taxonRank: genus; vernacularName: sp. "INPA 43862"; 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 (2004), Kner (1854), Muller et al. (1994), Günther (1864), Pellegrin (1912), and Eigenmann (1912) we report the following combination of characters allowing a genus-level identification only: three rows of lateral plates on the caudal peduncle; snout naked with fleshy tentacles lacking odontodes; body and head wide and extremely flattened; snout long and pointed; seven branched dorsal-fin rays; six branched pectoral-fin rays; eyes large (orbit diameter approximately 20% of HL) and situated high on the head; narrow gill openings; and colouration black, with small yellow-white dots in life.

Among the superficially similar nominal Ancistrus  -e.g. A. dolichopterus  Kner, 1854, A. hoplogenys  ( Günther, 1864), A. leucostictus  ( Günther, 1864), A. lithurgicus  Eigenmann, 1912, A. macrophthalmus  (Pellegrin, 1912), and A. ranunculus  Muller, Rapp Py-Daniel & Zuanon, 1994-this fish is most similar in the shape of head and eyes to A. macrophthalmus  and A. lithurgicus  . However, the fish collected from the lower Nhamundá had just three branched anal-fin rays, compared to four for both of these species. More individuals will need to be collected, and further investigation of available names in Ancistrus  carried out in order to discover if this indeed represents an undescribed species.

Two individuals were caught by hand at night from rocky substrates (sampling site NH01). An example of a live specimen is pictured in Fig. 15.