Triportheus albus Cope, 1872,

Malabarba, Maria Claudia S. L., 2004, Revision of the Neotropical genus Triportheus Cope, 1872 (Characiformes: Characidae), Neotropical Ichthyology 2 (4), pp. 167-204: 184-186

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Triportheus albus Cope, 1872


Triportheus albus Cope, 1872 

Fig. 13View Fig

Triportheus albus Cope, 1872: 264  (type-locality: “from the Ambyiacu”).

Chalcinus albus  . Garman, 1890:6 (description, Chalcinus knerii Steindachner, 1876  as synonym). Fowler, 1906:447 (description; type-material listed). Jordan, 1919:363 (designation of “logotype”). Triportheus albus  . Fowler, 1945:154 (listed; synonyms).

Chalcinus knerii Steindachner, 1876:50  (type not seen) typelocality: Tefé [rio Solimões].

Chalcinus rotundatus iquitensis Nakashima, 1941:65  (type locality: Porto de Iquitos).

Diagnosis. An elongate Triportheus  species reaching 151 mm SL (depth at dorsal-fin origin, 23.2-30.4, mean = 27.6% SL, n = 81; depth at pectoral-fin insertion, 24.2-33.2, mean = 28.8% SL, n = 79). The presence of 1 longitudinal scale row between the pectoral-fin insertion and the ventral keel distinguishes this species from all deep-bodied Triportheus  species all of which have 2 longitudinal scale rows between the pectoral-fin insertion and the ventral keel. The combination of the possession of 32-35 lateral line scales, 24-28 branched anal-fin rays, and 30-39 gill rakers on the lower limb of the first gill arch distinguish T. albus  from elongatebodied congeners except T. brachipomus  . T. albus  is distinguished from T. brachipomus  by the length of the postorbital region of the head (43.3-48.9% of HL, mean = 45.8,n = 30 versus 36.1-44.6% of HL, mean = 39.9, n = 30 in T. brachipomus  ), and the distance from the insertion of posterior most dorsal-fin ray to the adipose-fin origin (20.2-23.2% of SL, mean = 21.4, n = 30 versus 14.5-21.2% of SL, mean = 17.4, n = 30 in T. brachipomus  )

Description. Morphometric data for Triportheus albus  presented in Table 9. Body elongate and compressed laterally. Greatest body depth located slightly posterior to vertical through pectoral-fin insertion. Dorsal profile of head convex from upper lip to nares; nearly straight from nares to rear of head. Dorsal profile of body gently convex from rear of head to dorsal-fin origin; posteroventrally slanted along dorsal-fin base; straight from posterior terminus of dorsal-fin base to caudal peduncle; slightly concave along caudal peduncle. Dorsal portion of body transversely rounded.

ventrally, completely pored from supracleithrum to base of

caudal-fin rays. Thirty-two to 35 (mean = 33.6, n = 75) scales

in lateral line (50% of specimens with 34 scales); 5 scale series

between lateral line and dorsal-fin origin; 1-2 scale rows from

lateral line to pelvic-fin insertion. A series of large scales

between pectoral-fin insertion and midventral keel; 9-14 (mean

= 11.5, n = 68) scales along mid-dorsal line between tip of

supraoccipital process and dorsal-fin origin. Four or 5 rows

of scales on caudal peduncle.

Dorsal-fin rays ii,9; anal-fin rays iii,24-28 [26] (mean = 25.4,

n = 78); pectoral-fin rays i,10-13 [10] (mean = 11.1, n = 78);

pelvic-fin rays i,6. Dorsal-fin margin straight, situated on pos-

terior one-half of body; base of last dorsal-fin ray located

PROOFS rior Caudal tending

anterior branched fin over to emarginate vertical proximal anal-fin through rays one-third or forked much anal-fin of; scaled longer pelvic origin only than fin.. Pectoral basally Five following most. Middle fin anterays ex-.

caudal-fin rays terminate at or slightly beyond posterior mar- Ventral profile of head vertically straight from dorsal bor- gin of remainder of fin. der of lower lip to anteroventral margin of dentary; very Total vertebrae 38 [37]. slightly convex from that point to isthmus. Ventral profile of body distinctly convex from isthmus to pelvic-fin insertion; Coloration in alcohol. Overall ground color yellowish brown. nearly straight from that point to anal-fin origin; Body with diffuse, mid-lateral, silver stripe extending posteriposterodorsally slanted along anal-fin base; slightly con- orly from supracleithrum to caudal peduncle; stripe expandcave along caudal peduncle. Prepelvic region ventrally ex- ing vertically posteriorly. Body brownish dorsal to midlateral panded with midventral keel. stripe; light yellow ventral to stripe. Pectoral fin dark pig- Head obtusely pointed in profile; snout nearly straight in mented along first rays. Dorsal and anal fin sparsely pigprofile. Mouth terminal; lower jaw equal to upper jaw. Nos- mented with dark chromatophores. Distal tips of anal-fin rays trils of each side close together; anterior opening circular; dark. Caudal-fin darkly outlined; series of chromatophores posterior kidney-shaped. Eye large, without adipose eyelid. distributed on anterior one-third of caudal-fin rays. Gill rakers thin and close together; gill-rakers length about one-half of branchial filament length; gill rakers on Distribution. Rios Amazonas, Tocantins and Araguaia balower limb of first gill arch 30-39 [32] (mean = 35.2, n = 74). sins ( Fig. 12View Fig).

Type-material remarks. Cope (1872: 264) did not provide a catalog number for the type material of Triportheus albus  , but only described it as “total length m..061; length to basis of dorsal fin.0292; from D.I to basis caudal.02” and refers to the type locality as “the Ambyiacu”. Subsequently, Fowler (1906:447) listed the type as ANSP 21234. The holotype is a very damaged young specimen lacking the ventral margin of the body.

No type was designated for Chalcinus rotundatus iquitensis  by Nakashima (1941) and the synonymy of that species into T. albus  in this paper is based on information in the original description, in particular the 31 lateral line scales and 17+35 gill rakers (“branquiespinas”). Chalcinus rotundatus iquitensis  is an homonym of Chalcinus elongatus iquitensis Nakashima (1941:63)  described in the same paper.

The types of Chalcinus knerii  could not be located at NMW (H. Wellendorf pers. comm., Feb.1999). The single lot identified as Chalcinus knerii  in that collection ( NMW 12562View Materials - 63), is not labeled as type, and contains two specimens, instead of the one described by Steindachner. Although one of these specimens fits the length provided in the original description of C. knerii  , it was collected in rio Negro, rather than “ Amazonas (bei Teffe?)” as cited in the original description. Nonetheless, some data in the original description (lateral line scales 34, anal-fin rays 29, scale series above lateral line 5) suggests that C. knerii  is a junior synonym of Triportheus albus  .

Type- material. Triportheus albus  , holotype, ANSP 21234View Materials, 54.4 mm SL, Peru, río Ambyiacu , J. Hauxwell  .

Non-type material. Bolivia: Beni: UMMZ 204248View Materials (10), río Itenez (= rio Guaporé ), opposite Costa Marques (12º29’S, 64º16’W)GoogleMaps  . Brazil: Amazonas : INHS 66933View Materials (11), lago Marchantaria (4°4’S, 59°7’W)GoogleMaps  ; INHS 65906View Materials (7) lake Terra Preta , about 8 km SW Manaus (4°12’S, 59°57’W)GoogleMaps  ; INHS 73035View Materials (1 of 4), lago Marchantaria , Camaleão Inlet, about 12 km S Manaus (4°4’S, 59°7’W)GoogleMaps  ; MZUSP 58853View Materials (8), rio Negro, São Gabriel da Cachoeira (0°7’S, 67°5’W)GoogleMaps  ; MZUSP 5852View Materials (10 of 14), rio Negro, Manaus (3°10’S, 60°0’W)GoogleMaps  . Roraima: MZUSP 30509View Materials (5), rio Branco , Marara (1°2’N, 62°10’W)GoogleMaps  . Goiás: MCP 17210View Materials (4 of 5), lakes of rio Araguaia , near Luis Alves (13º14’S, 50º35’W)GoogleMaps  . Mato Grosso: MZUSP 53590View Materials (4), rio Araguaia, furo near Aldeia Fontoura. Pará: MCP 15160View Materials (1), rio Tapajós , in the Centro Educacional Boas Novas, Itaituba (4°16’S, 55°59’W)GoogleMaps  ; FMNH 56496View Materials (8), Santarém (0°57’S, 46°59’W)GoogleMaps  . Ecuador: Napo: FMNH 103053View Materials (8), río  Napo at Destacamento Tiputini (0º47’S, 75º33’W)GoogleMaps  ; FMNH 94414View Materials (3), río  Napo, at Coca , beach in middle of river just upstream from bridge (0º27’S, 76º54’W)GoogleMaps  ; FMNH 103052View Materials (6 of 11), río Yasuni , laguna Jatuncocha (1º0’S, 75º29’W)GoogleMaps  ; FMNH 103054View Materials (1), río Tiputini , near mouth in río  Napo and Quebradas (0º49’S, 75º31’W)GoogleMaps  . Peru: Loreto: INHS 38943View Materials (8 of 9), Iquitos at Requena (03°44’S, 73°14’W)GoogleMaps  ; INHS 43617View Materials (1), río Napo and Quebradas   . Madre de Dios: USNM 295169View Materials (2), Parque Nacional Manu, Pakitza and vicinity (7°16’S, 76°46’W)GoogleMaps  ; USNM 264028View Materials (1), shore of island about 15 km downriver of junction of río Tambopata and río  Madre de Dios (12°30’S, 69°8’W)GoogleMaps  ; MUSM 9676 (4), río  Madre de Dios, Tambopata (12°30’49”S, 68°47’44”W)GoogleMaps  . Ucayali: USNM 280577View Materials (1), Província Coronel Portillo, main channel and side pools of  río Ucayali, 10 km upstream of Pucallpa (8°31’S, 74º22’W)GoogleMaps  .


Pontificia Universidade Catolica do Rio Grande do Sul














Triportheus albus Cope, 1872

Malabarba, Maria Claudia S. L. 2004

Chalcinus rotundatus iquitensis

Nakashima, S 1941: 65

Chalcinus albus

Fowler, H 1945: 154
Jordan, D 1919: 363
Garman, S 1890: 6

Chalcinus knerii

Steindachner, F 1876: 50

Triportheus albus

Cope, E 1872: 264