Phallobrycon adenacanthus Menezes, Ferreira & Netto-Ferreira 2009

Phallobrycon and Bryconadenos are the only members of the Clade A characids that possess a combination of intumescent glandular tissue present on the anterior part of the anal fin and pelvic-fin hooks absent in sexually mature males. This species can be diagnosed by the following characters: the glandular tissue is associated with specially developed spines on some anal-fin rays. Two developed spines are present on median unbranched portions of fifth, sixth and seventh anal-fin rays which are larger and separated from the close-set smaller hooks that appear on distal portions of the anterior anal-fin rays of Phallobrycon, and different from those found on distal portions of several anal-fin rays of many characids. Large spines and small hooks are never found together on any anal-fin ray in Phallobrycon; presence of a simple concentration of glandular tissue on the anterior part of the anal fin; and presence of a developed urogenital papilla in male specimens (Ref. 81937).Description: Dorsal fin ii, 8; anal fin iv, 18-23; pectoral fin i, 11-13; pelvic fin i, 7 (Ref. 81937).

Dorsal soft rays (total): 10; Analsoft rays: 22 - 27; Vertebrae: 37 - 39

Found in the main channel of rivers with fast flowing and rather shallow clear waters, with abundance of rocks and thick sand (Ref. 81937).

Phallobrycon adenacanthus is a species of characin endemic to Brazil, where it is found in the Rio Xingu basin.

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Phallobrycon adenacanthus Phallobrycon generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Characidae familian.

碧背莖齧脂鯉，為輻鰭魚綱脂鯉目脂鯉亞目脂鯉科的其中一個種，為熱帶淡水魚，分布於南美洲巴西鑫谷河流域，體長可達4公分，棲息在沙石底質、水質清澈的淺水溪流，生活習性不明。