Author: Crampton, de Santana, Waddell & Lovejoy, 2017
Comments: The type series was sampled from high-conductivity whitewater floodplain sites and from the lower, seasonally inundated reaches of terra firme streams.  Found most commonly in marginal root
  mats, and in emergent or submerged aquatic vegetation.  The recorded water parameters at the sampling sites were the following: conductivity 150-160 μScm-1, dissolved oxygen 5.0-6.0 mgl-1, temperature 27-28°C, and pH 7.5-7.6.  Adults in spawning condition were observed during the dry season in June-July 2007.  Aquatic insect larvae and other small aquatic invertebrates were found in the stomach contents of specimens from the type locality. <i>Brachyhypopomus arrayae</i> co-occurs in geographical sympatry and ecological syntopy with whitewater floodplain-occurring species such as <i>B. bombilla</i>, <i>B. <i>brevirostris</i>, <i>B. pinnicaudatus</i>, and <i>B. walteri</i>.  Largely allotopic in the region of the type locality with the following terra firme stream occurring species: <i>B. alberti</i> and <i>B. sullivani</i>, although <i>B. arrayae</i> was found with <i>B. alberti</i> at the ecotone between terra firme streams and floodplain systems (Ref. 116763).