Triportheus auritus

Malabarba, Maria Claudia S. L., 2004, Revision of the Neotropical genus Triportheus Cope, 1872 (Characiformes: Characidae), Neotropical Ichthyology 2 (4), pp. 167-204: 178-179

publication ID

http://doi.org/ 10.1590/S1679-62252004000400001

publication LSID

lsid:zoobank.org:pub:05419978-D5CB-4416-8558-B1F03D90B521

persistent identifier

http://treatment.plazi.org/id/481F8783-FF80-6E14-5069-C8598CD89785

treatment provided by

Carolina

scientific name

Triportheus auritus
status

 

Triportheus auritus  

(Valenciennes, in Cuvier & Valenciennes, 1850) Fig. 7 View Fig

Chalcinus auritus Valenciennes   , in Cuvier & Valenciennes, 1850:262-263 (description).

Triportheus auritus   . Fowler, 1950:357 (synonymy; Brazil, Amazonas, rio Araguaia).

Chalcinus elongatus Günther, 1864:342   (description; typelocality: “?”).

Triportheus elongatus   . Fowler, 1945:153 (listed with synonyms, for Peru).

Chalcinus cruzi Miranda-Ribeiro, 1941: 173   (description, Brazil, rio Amazonas).

Chalcinus amazonensis Miranda-Ribeiro, 1941:174   (description, Brazil, no type-locality)

Diagnosis. An elongate Triportheus   species reaching 242 mm SL (depth at dorsal-fin origin, 22.5-28.8 % SL; depth at pectoral-fin insertion, 24.8-32.0 % SL). The presence of 1 longitudinal scale row between the pectoral-fin insertion and ventral keel distinguish this species from all deep-bodied Triportheus   species that have 2 longitudinal scale rows between the pectoral-fin insertion and ventral keel. Triportheus auritus   is distinguished from all elongate and deep-bodied Triportheus   species by the combination of the small number of gill rakers on the lower limb of first gill arch (22-28, mean = 24.8, n = 39) and the high number of lateral-line scales (40-46, mean = 43.9, n = 36).

Description. Morphometric data of Triportheus auritus   presented in Table 6. Body elongate and compressed laterally. Greatest body depth located slightly posterior to vertical through pectoral-fin insertion. Dorsal profile of head slightly convex from upper lip to nares; nearly straight from nares to rear of head. Dorsal profile of body nearly straight from rear of head to dorsal-fin origin; posteroventrally slanted along dorsal-fin base; less inclined from posterior terminus of dorsal fin to caudal peduncle; slightly concave along caudal peduncle. Dorsal portion of body transversely rounded.

Ventral profile of head vertically straight from dorsal border of lower lip to anteroventral margin of dentary; straight from that point to joint with quadrate. Ventral profile of body arched from isthmus to pelvic-fin insertion; slightly curved to nearly straight from that point to analfin origin; posterodorsally slanted along anal-fin base; slightly concave along caudal peduncle. Prepelvic region ventrally expanded with midventral keel; kell extending to anal-fin origin.

Head pointed in profile. Mouth terminal; lower jaw as long as upper jaw. Nostrils of each side close together; anterior opening circular; posterior kidney-shaped. Eye large, without adipose eyelid.

Gill rakers thick and separated, gill-raker length about one-half length of branchial filament; gill rakers on lower limb of first arch 22-28 [25] (mean = 24.8, n = 39).

Teeth on premaxilla in 3 rows; teeth of inner row larger. Outer row formed by 5 pentacuspidate teeth; middle row with 2 teeth, inner row with 6 teeth. Maxilla with 2-4 teeth, smaller than smallest teeth on premaxilla. Teeth on lower jaw in 2 rows with 5-6 teeth with 5-7 cusps in outer row and inner row consisting of single conical symphyseal tooth.

Scales cycloid, thin, and large. Lateral line distinctly decurved ventrally, completely pored from supracleithrum to base of caudal-fin rays. Forty to 46 [43] (mean = 43.9, n = 36) scales in lateral line; 6 scale series between lateral line and dorsal-fin origin; 2 scale rows between lateral line and pelvic-fin insertion. One large scale row between pectoral-fin insertion and midventral keel; 14-20 [19] (mean = 17.6, n = 31) scales along mid-dorsal line between tip of supraoccipital spine and dorsal-fin origin. Five rows of scales on caudal peduncle.

Dorsal-fin rays ii,9; anal-fin rays iii,24-28 [28] (mean = 26.2, n = 39); pectoral-fin rays i,11-13 [11] (mean = 11.9, n = 39); pelvic-fin rays i,6. Dorsal-fin margin straight, dorsal-fin base situated on posterior one-half of body; base of last dorsal-fin ray located anterior to vertical through anal-fin origin. Pectoral large, extending posteriorly as far as mid length of pelvic fin. First branched anal-fin ray longest; following rays rapidly decreasing in length. Caudal truncate, scaled only at base. Middle caudal-fin rays extended slightly beyond posterior margin of remainder of fin.

Total vertebrae 43-44.

Distribution. Rio Amazonas, Tocantins, and Araguaia basins, río Orinoco basin, Trinidad ( Fig. 8 View Fig ).

Remarks about type-specimens. Cuvier & Valenciennes (1849:263) noted that “[the length of our fish is six pounces. The specimens deposited in the collection of the museum were collected in the Amazon by Mr. Castelnau] (my translation). No specimens identified as Chalcinus auritus   with these data were located in the holdings of MNHN (where the specimens were supposed to belong). A neotype collected in the rio Amazonas drainage (MZUSP 58859, rio Negro, Anavilhanas), is designated herein for Triportheus auritus   . That species as defined herein best fits the original description by Valenciennes, in terms of overall body and head shape, and counts of the lateral-line scales and anal-fin rays.

Coloration in alcohol. Overall ground color yellowish brown. Snout, lower lip, and dorsal portion of head dark. Scattered dark chromatophores present on all head bones. Body with mid-lateral dark stripe extending from supracleithrum posteriorly to caudal peduncle; stripe becoming diffuse posteriorly and broadened into distinctly wider diffuse dark spot on lateral surface of caudal peduncle. Body darker brown dorsal to midlateral stripe. Dorsal margin of body dark. All fins pigmented along rays. Dorsal and pectoral-fin rays outlined by dark chromatophores. Distal tips of anal-fin rays darker. Caudal-fin rays outlined by series of dark chromatophores.

Type-material examined. Triportheus auritus   : Neotype by present designation, MZUSP 58859, 185.9 mm SL, Brazil, Amazonas, rio Negro , Anavilhanas, M. Goulding, Oct 1979 (2°42’S, 60°45’W). GoogleMaps  

Chalcinus elongatus   : holotype, BMNH 1852.9.13   :10, no locality. Günther (1864:342) in the original description of Chalcinus elongatus   refers to the type-material as being “From the Collection of the Zoological Society” and the distribution as “Hab.—?”. A specimen identified as the holotype of Chalcinus elongatus   is housed in BMNH ( BMNH 1852.9.13:10)   .

Chalcinus amazonensis   : holotype, MNRJ 2771 View Materials , rio Amazonas, M. Lobato   .

Chalcinus cruzi   : holotype, MNRJ 2775 View Materials , South America , O. Cruz   .

Non-type material. Brazil: Amazonas   : USNM 229127 View Materials (2), near Manaus, lago Janauari, lago Canta Galos (3°12’S, 60°1’W) GoogleMaps   ; USNM 307147 View Materials (3), Ressaca da Ilha de Marchantaria (4°4’S, 59°7’W) GoogleMaps   ; USNM 307137 View Materials (1), lago Canta Galos, lago Janauari (3°12’S, 60°1’W) GoogleMaps   ; USNM 311094 View Materials (1), rio Solimões between Manaus and Tefé (3°22’S, 64°41’W) GoogleMaps   ; USNM307103 View Materials (1), paraná da Ilha de Marchantaria (4°4’S, 59°7’W) GoogleMaps   ; INHS 71472 View Materials (4), lago Janauari about 8 km SW Manaus (3°12’S, 60°1’W) GoogleMaps   ; INHS 73035 View Materials (3), lago Marchantaria, Camaleão inlet, Marchantaria Island , about 12 km S Manaus (4°4’S, 59°7’W) GoogleMaps   ; INHS 67386 View Materials (2), lago Canta Galos off lago Janauari , about 8 km SW Manaus (3°12’S, 60°1’W) GoogleMaps   ; USNM 307117 View Materials (2), Ressaca da Ilha de Marchantaria (4°4’S, 59°7’W) GoogleMaps   ; USNM 307139 View Materials (3 of 8), Ressaca da Ilha de Marchantaria (4°4’S, 59°7’W) GoogleMaps   ; MZUSP 19768 View Materials (9), lago Janauacá. Mato Grosso   : MCP s/n (3), rio Araguaia, Barra do Garças (16°20’S, 52°41’W) GoogleMaps   . Pará   : FMNH 56501 View Materials (1), Santarém (0°57’S, 46°59’W) GoogleMaps   . Goiás: MCP 17212 View Materials (5), Rio Araguaia near Luis Alves (13º14’S, 50º35’W) GoogleMaps   . Equador: Napo: FMNH 103056 View Materials (10), río Yasuni, Laguna Jatuncocha (1º0’S, 75º29’W) GoogleMaps   . Guiana: FMNH 7496 View Materials (1), Morawhanna (8°16’N, 59°45’W) GoogleMaps   . Peru: Loreto: USNM 280625 View Materials (1), green water caño on left bank of río Manite, about 8 km upriver of junction of río Manite and rio Amazonas (3°31’S, 72°40’W) GoogleMaps   ; USNM 280493 View Materials (1), río Nanay approximately 20 km upstream of mouth, main channel, side channels and side pools (3º51’S, 73º1’W) GoogleMaps   ; USNM 280508 View Materials (1), río Itaya , main river channel and lower portions of caños, 5 to 20 km upstream of Belen, Iquitos (3º51’S, 73º12’W) GoogleMaps   ; USNM 280492 View Materials (1), Quebrada Corrientillo, at Corrientillo, on road running West From Iquitos to río Nanay (3º50’S, 73º13’W) GoogleMaps   . USNM 280494 View Materials (2), canyons entering río Nanay, Northeast of Iquitos (3º49’S, 73º11’W) GoogleMaps   ; NRM 30491 View Materials (1), río Itaya drainage, Quisto Cocha, W lake margin, (3º50’S, 73º16’W) GoogleMaps   ; NRM 30487 View Materials (1), rio Nanay drainage, Bella Vista, Vieja Cocha   . INHS 39760 View Materials (1) lago Pabellon, río Orosa, Amazonas drainage, 40 min from Paucarillo (03º44’S, 72º25’W) GoogleMaps   ; INHS 40370 View Materials (6), río Nanay Amazonas drainage, Pampa Chica, N edge of Iquitos (03º44’S, 73º16’W) GoogleMaps   ; INHS 38943 View Materials (1 of 9), Iquitos dock at Requena , (03º44’S, 73º14’W) GoogleMaps   ; USNM 176118 View Materials (1), Caño Shansho, Ampyacu (4°6’S, 72°59’W) GoogleMaps   . Trinidad: USNM 229911 View Materials (5), Chatham at river mouth about 100 m upstream (10°53’N, 61°52’W) GoogleMaps   . Venezuela: Delta do Amacuro   : USNM 233639 View Materials (6), río Orinoco, small side caño, caño Araguao, 112 Naut. mi upstream from sea buoy (8º38’N, 61º43’W) GoogleMaps   ; AMNH 217731 View Materials (5), North side río Orinoco , caño on isla Guacujana, S shore. Amazonas   : FMNH 103902 View Materials (1), Río Orinoco ca. 5 h above Atabapo by falca (4°2’N, 67°42’W) GoogleMaps   ; INHS 29146 View Materials (1), río Mavaca (2°31’N, 65°11’W) GoogleMaps   ; AMNH 93061 View Materials (1), río Mavaca , 45 min up river from base camp (2°31’N, 65°11’W) GoogleMaps   . Monagas: FMNH 55905 View Materials (1), La Pedrita   ; USNM 233227 View Materials (2), isolated lagoon on isla Tapatapa, at Los Castillos, 163 Naut. mi from sea buoy (8°31’N, 62°26’W) GoogleMaps   . Bolívar: UMMZ 211304 View Materials (4), small canyons on the west side of río Arature , several km upstream from mouth, Orinoco drainage (8º35’N, 60º53’W) GoogleMaps   ; INHS 35088 View Materials (1), laguna Castillero, near río Orinoco (7º38’N, 66º9’W) GoogleMaps   ; INHS 35220 View Materials (1), laguna Castilhero (7º38’N, 66º9’W) GoogleMaps   . Guarico: INHS 34483 View Materials (1), río San Bartolo at Aguas Muertas (8º4’N, 66º40’W) GoogleMaps   . Apure: INHS 61491 View Materials (2), Cano San Miguel, río Cinaruco (6º 4’N, 67º17’W) GoogleMaps   . Anzoategui: INHS 29281 View Materials , laguna Orsinera (8º9’N, 63º34’W) GoogleMaps   . INHS 29267 View Materials (1), laguna las Tejitas (8º9’N, 63º26’W) GoogleMaps   .

MZUSP

Museu de Zoologia da Universidade de Sao Paulo

MCP

Pontificia Universidade Catolica do Rio Grande do Sul

NRM

Swedish Museum of Natural History - Zoological Collections

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Characiformes

Family

Triportheidae

Genus

Triportheus

Loc

Triportheus auritus

Malabarba, Maria Claudia S. L. 2004
2004
Loc

Triportheus auritus

Fowler, H 1950: 357
1950
Loc

Triportheus elongatus

Fowler, H 1945: 153
1945
Loc

Chalcinus cruzi

Miranda-Ribeiro, P 1941: 173
1941
Loc

Chalcinus amazonensis

Miranda-Ribeiro, P 1941: 174
1941
Loc

Chalcinus elongatus Günther, 1864:342

Gunther, A 1864: 342
1864