Hemibrycon pautensis (Characiformes, Characidae), a new fish species from Paute River, eastern Ecuador is described. Diagnostic characteristics : eight to nine branched rays in the dorsal fin (vs. six to seven), and 27 - 28 in the anal fin (vs. 16 - 26, except in H. dariensis which presents 22 - 27, in H. metae 26 - 31 and H. savonero 23 - 28) ; a no occurrence of dorsal pharyngeal plate (vs. occurrence) ; a cartilaginous and divided-in-two basihial (vs. an osseous base and a cartilaginous upper part). Hemibrycon pautensis resembles H. metae by its oblique external edge of the pelvic fins. They can be distinguished by the position of the pectoral fins in relation to the snout (38.24-41.6 % in H. pautensis vs. 21.21-25.87) and by the position of the pectoral fins in relation to the origin of the dorsal fin (20.95-24.30 in Hemibrycon pautensis vs. 35.89-42.63), and by the number of proximate radials in the pectoral girdle (five in Hemibrycon pautensis vs. three to four). En outre, the geographic distribution of H. metae is restricted to the upper part of the Meta River in Colombia and can be distinguished of H. boquiae by : the number of scales between the lateral-line and the origin of the dorsal fin (eight in H. pautensis vs. 5-7) ; the distance between the snout and the pelvic fins (38.00-42.90 % in H. pautensis vs. 42.9-46.19%) ; the pelvic fins length (13.77-17.96% in H. pautensis vs. 10.72-13.21%) ; and the snout length (21.34-27.88 in H. pautensis vs. 26.92-33.66%).

Hemibrycon pautensis (Characiformes, Characidae), a new fish species from Paute River, eastern Ecuador is described. Diagnostic characteristics: eight to nine branched rays in the dorsal fin (vs. six to seven), and 27 - 28 in the anal fin (vs. 16 - 26, except in H. dariensis which presents 22 - 27, in H. metae 26 - 31 and H. soap dish 23 - 28); a no occurrence of dorsal pharyngeal plate (vs. occurrence); a cartilaginous and divided-in-two basihial (vs. an osseous base and a cartilaginous upper part). Hemibrycon pautensis similbles H. metae by its oblique external edge of the pelvic fins. They can be distinguished by the position of the pectoral until in relation to the snout (38.24-41.6% in H. pautensis vs. 21.21-25.87) and by the position of the pectoral until in relation to the origin of the dorsal fin (20.95-24.30 in Hemibrycon pautensis vs. 35.89-42.63), and by the number of proximate radials in the pectoral girdle (five in Hemibrycon pautensis vs. three to four). In addition, the geographic distribution of H. metae is restricted to the upper part of the Meta River in Colombia and can be distinguished from H. boquiae by: the number of scales between the lateral-line and the origin of the dorsal fin (eight in H. pautensis vs. 5-7); the distance between the snout and the pelvic fins (38.00-42.90% in H. pautensis vs. 42.9-46.19%); the pelvic fins length (13.77-17.96% in H. pautensis vs. 10.72-13.21%); and the snout length (21.34-27.88 in H. pautensis vs. 26.92-33.66%).

Hemibrycon pautensis (Characiformes, Characidae), a new fish species from Paute River, eastern Ecuador is described. Diagnostic characteristics: eight to nine branched rays in the dorsal fin (vs. six to seven), and 27 - 28 in the anal fin (vs. 16 - 26, except in H. dariensis which presents 22 - 27, in H. metae 26 - 31 and H. jabonero 23 - 28); a no occurrence of dorsal pharyngeal plate (vs. occurrence); a cartilaginous and divided-in-two basihial (vs. an osseous base and a cartilaginous upper part). Hemibrycon pautensis resembles H. metae by its oblique external edge of the pelvic fins. They can be distinguished by the position of the pectoral fins in relation to the snout (38.24-41.6% in H. pautensis vs. 21.21-25.87) and by the position of the pectoral fins in relation to the origin of the dorsal fin (20.95-24.30 in Hemibrycon pautensis vs. 35.89-42.63), and by the number of proximate radials in the pectoral girdle (five in Hemibrycon pautensis vs. three to four). In addition, the geographic distribution of H. metae is restricted to the upper part of the Meta River in Colombia and can be distinguished of H. boquiae by: the number of scales between the lateral-line and the origin of the dorsal fin (eight in H. pautensis vs. 5-7); the distance between the snout and the pelvic fins (38.00-42.90 % in H. pautensis vs. 42.9-46.19%); the pelvic fins length (13.77-17.96% in H. pautensis vs. 10.72-13.21%); and the snout length (21.34-27.88 in H. pautensis vs. 26.92-33.66%).

تم وصف Hemibrycon pautensis (Characiformes، Characidae)، وهو نوع جديد من الأسماك من نهر Paute، شرق الإكوادور. الخصائص التشخيصية: ثمانية إلى تسعة أشعة متفرعة في الزعنفة الظهرية (مقابل ستة إلى سبعة)، و 27 - 28 في الزعنفة الشرجية (مقابل 16 - 26، باستثناء H. dariensis التي تقدم 22 - 27، في H. metae 26 - 31 و H. soap dish 23 - 28 )؛ عدم حدوث صفيحة بلعومية ظهرية (مقابل الحدوث )؛ غضروفي ومنقسم إلى قاعدتين (مقابل قاعدة عظمية وجزء علوي غضروفي). يشبه Hemibrycon pautensis H. metae بحافته الخارجية المائلة لزعانف الحوض. يمكن تمييزها عن طريق موضع الزعنفة الصدرية حتى فيما يتعلق بالأنف (38.24-41.6 ٪ في H. pautensis مقابل 21.21-25.87) وعن طريق موضع الزعنفة الصدرية حتى فيما يتعلق بأصل الزعنفة الظهرية (20.95-24.30 في Hemibrycon pautensis مقابل 35.89-42.63)، وعن طريق عدد الكعبرات القريبة في الحزام الصدري (خمسة في Hemibrycon pautensis مقابل ثلاثة إلى أربعة). بالإضافة إلى ذلك، يقتصر التوزيع الجغرافي لـ H. metae على الجزء العلوي من نهر ميتا في كولومبيا ويمكن تمييزه عن H. boquiae من خلال: عدد المقاييس بين الخط الجانبي وأصل الزعنفة الظهرية (ثمانية في H. pautensis مقابل 5-7 )؛ المسافة بين الأنف وزعانف الحوض (38.00-42.90 ٪ في H. pautensis مقابل 42.9-46.19 ٪)؛ طول زعانف الحوض (13.77-17.96 ٪ في H. pautensis مقابل 10.72-13.21 ٪)؛ وطول الأنف (21.34-27.88 في H. pautensis مقابل 26.92-33.66 ٪).