Guianacara dacrya Arbour & López-Fernández 2011

This species (belonging to the subgenus Guianacara) can be distinguished from G. oelemariensis (subgenus Oelemaria) by the possession of 2 supraneural bones, produced dorsal-fin lappets and a midlateral bar. It is distinguished from all other species in the subgenus Guianacara by the possession of an infraorbital stripe that progressively fades across the cheek (from just beneath the eye to the dorsal edge of the pre-opercle) in individuals which are more than 45 mm SL, but remains black or dark brown across the preopercle and interopercle (vs. infraorbital stripe continuous throughout ontogeny); posterior half of the lower pharyngeal jaw toothplate with a dorsally edentulous laminar expansion of the lateral margin (vs. absent in other species of Guianacara). G. dacrya can by further distinguished from G. stergiosi, G. sphenozona, G. owroewefi and G. geayi by the possession of a thin midlateral bar which covers three scales at its widest point, thinning to 1.5 to 2 scales (vs. never less than 3 scales); from G. geayi and G. sphenozona, by the retention of the juvenile dark coloration of the 3 anterior dorsal-fin spines and lappets in adults (vs. lost); from G. owroewefi and G. sphenozona by the possession of white spots on both the soft and spiny portions of the dorsal-fin; from G. stergiosi and G. cuyunii by a larger eye, a shorter and narrower head, shorter pectoral fin and by produced filaments of the anal, dorsal and (occasionally) caudal fins; from adult G. cuyunii by a distinct midlateral spot, the possession of dusky branchiostegal membranes and a shallower body; from adult G. stergiosi by a shorter preorbital region and longer pelvic fins. In G. dacrya, when a midlateral spot is distinguishable, it is small, round and placed on and below the upper lateral line, similar to G. stergiosi (vs. large and oval shaped (G. owroewefi) or placed on and above the upper lateral line (G. sphenozona) (Ref. 86674).

This species is usually found associated with clear water streams with moderate current; also in seasonally flooded lagoons with no current in the Rupununi savannas. The substrate is usually sandy with nearby large rocks; large numbers of juveniles were observed in river sections formed by mixtures of pebbles and small rocks over sandy bottom, frequently with some leaf litter. Water parameters where it was collected showed a temperature range of 24.8-28.5ºC, with relatively high dissolved oxygen levels (5.3-6.56 mg/L) and very low conductivity (27.1-34.5µS) at localities in the Rupununi and Pirara (Ireng) drainages (Ref. 86674).

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Guianacara dacrya Guianacara generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Cichlidae familian.

達氏圭亞那麗魚，為輻鰭魚綱鱸形目隆頭魚亞目慈鯛科的其中一種，分布於南美洲蓋亞那的淡水流域，體長可達12公分，棲息在溪流中底層水域，生活習性不明。