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

Ancistrus sp. "INPA 43862"

Materials

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: PreservedSpecimen

Notes

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.