Steindachnerina nigrotaenia ( Boulenger, 1902 )

Britski, Heraldo A., Melo, Bruno F., Vari, Richard P. & Oliveira, Claudio, 2019, Revalidation and redescription of Steindachnerina nigrotaenia and redescription of S. insculpta (Characiformes: Curimatidae), Neotropical Ichthyology 17 (1), pp. 1-14: 5-9

publication ID

http://doi.org/ 10.1590/1982-0224-20180076

DOI

http://doi.org/10.5281/zenodo.3664903

persistent identifier

http://treatment.plazi.org/id/03A587DF-FFAE-FFE1-FF41-06F9FB44F84C

treatment provided by

Carolina

scientific name

Steindachnerina nigrotaenia ( Boulenger, 1902 )
status

 

Steindachnerina nigrotaenia ( Boulenger, 1902)  

Fig. 2 View Fig , Tab. 2 View Tab

Curimatus nigrotaenia Boulenger, 1902:2   [type-locality: Mato Grosso, rio Coxipó].- Eigenmann, 1910:421 [reference]. - Vari, 1989, tables 2, 3 [assignment to Steindachnerina   ]. - Tortonese, 1961:184 [Catalog: three syntypes]. - Litz & Koerber, 2014:9 [Check list; synonym of Steindachnerina brevipinna   ].

Curimata nigrotaenia   .- Fernández-Yépez, 1948:73 [reference].- Fowler, 1950:288 [literature compilation].- Fowler, 1975:369 [reference].- Ringuelet, 1975:72 [ Argentina, rio Paraguai system].

Steindachnerina nigrotaenia   .- Britski, 1996:74 (previous resurrection).- Britski et al., 1999:72 [diagnose in key; shortened description; text-figure; Pantanal do Mato Grosso].- Britski et al., 2007: 96 [diagnose in key; shortened description; text figure; Pantanal do Mato Grosso].- Polaz et al., 2014:125 [list of species from Parque Nacional do Pantanal Matogrossense].

Steindachnerina insculpta   .- Vari, 1991:71 [in part, material from rio Paraguai basin, not from upper rio Paraná basin]. - Aguilera et al., 2018:1018 [ Argentina: río San Francisco, Bermejo river basin, Jujuy, and Madrejón El Divisadero, Bermejo river basin, Salta].

Steindachnerina brevipinna   . - Vari, 1991:97 [in part, material from Mato Grosso, upper rio Paraguai].

? Curimata nasa   .- Géry et al., 1987:425, fig. 41 [material from arroyo Trementina, rio Paraguai basin].

Diagnosis. Steindachnerina nigrotaenia   can be distin- guished from all congeners, except S. binotata (Pearson, 1924)   , S. biornata   , S. dobula (Günther, 1868)   , S. hypostoma (Boulenger, 1887)   , S. insculpta   , S. leucisca (Günther, 1868)   , S. notograptos Lucinda & Vari, 2009   , and S. varii Géry, Planquette, Le Bail, 1991   , by possessing an unpigmented dorsal fin (vs. a dorsal fin with a spot of dark pigmentation on the basal portion of the middle rays). Steindachnerina nigrotaenia   has 43 to 48 perforated scales in the lateral line series running from the supracleithrum to the middle rays of the caudal fin, differing from S. binotata   , S. leucisca   and S. notograptos   , which have 50 or more perforated scales in that series and from S. biornata   and S. varii   which have fewer than 40 perforated scales in the lateral line series. Steindachnerina nigrotaenia   differs from S. hypostoma   by possessing a relatively shallower body with greatest body depth 24-27% of SL (vs. 29-34% of SL). Steindachnerina nigrotaenia   differs from S. dobula   and S. varii   by having a dark midlateral stripe extending from the rear of the opercle posteriorly onto middle rays of caudal fin (vs. dark midlateral stripe beginning posterior to a verti- cal line through the dorsal-fin origin, and continuing posteriorly to the middle rays of the caudal fin). Steindachnerina nigrotaenia   differs from the very similar S. insculpta   by the generally higher number of perforated scales along the lateral line series (43 to 48, 45 most frequent, vs. 40 to 45, 42 most frequent and 44 and 45 in only 1.3% of specimens examined for this feature, respectively; Fig. 3 View Fig ), by the total number of scale rows in the transverse series from the dorsal-fin origin to the pelvic-fin base (13 to 16, 14 most frequent, vs. 12 to 14, 12 most frequent and 13.5 and 14 in only 6.4% and 1.3% of specimens examined for this feature, respectively; Fig. 4 View Fig ). Steindachnerina nigrotaenia   can also be discriminated from congeners by a combination of the following features: multiple lobulated fleshy processes on the roof of the oral cavity, absence of a wide, flattened prepelvic region of the body, possession of 43 to 48 perforated scales in the lateral line series, 13 to 16 scales in the transversal series, lack of a dark spot on the basal portions of the dorsal fin and the presence of a dark midlateral stripe along the lateral surface of the body.

Description. Morphometric data of lectotype, paralecto- types and other specimens are summarized in Tab. 2 View Tab . Body relatively elongate, somewhat compressed. Dorsal profile of head slightly convex anteriorly, straight from the line above orbit to rear of head. Dorsal profile of body straight or very slightly convex from rear of head to origin of dorsal fin; straight at dorsal-fin base; straight from base of last dorsal-fin ray to caudal peduncle. Dorsal surface of body transversely rounded anteriorly, with indistinct median keel immediately anterior to dorsal fin, smoothly rounded transversely posterior to dorsal fin. Ventral profile of body gently curved from tip of lower jaw to caudal peduncle. Prepelvic region obtusely flattened, with median series of scales proximate to pelvic-fin origin, median series irregularly arranged anteriorly. Barely discernable median keel posterior to pelvic-fin origin.

Dorsal-fin margin rounded; anteriormost rays three to 3.5 times the length of ultimate ray. Pectoral-fin margin acute, extending one-half to two-third the distance to origin of pelvic fin in smaller adults, barely beyond that point in largest specimens examined. Pelvic-fin margin acute; pelvic fin extending about one half the distance to origin of anal fin. Caudal fin forked. Adipose fin well developed. Anal fin emarginate, anteriormost branched rays 2.5 to three times the length of ultimate ray.

Head profile pointed; upper jaw distinctly longer, mouth inferior; buccopharyngeal complex on roof of the oral cavity in adults consisting of multiple lobulated fleshy bodies; nostrils very close, anterior circular, posterior crescent-shaped with aperture closed by thin flap of skin separating nares; adipose eyelid present, more developed anteriorly, with broad, vertically ovoid opening over center of eye.

Pored lateral-line scales from supracleithrum to medial caudal-fin rays 43(1), 44(9), 45*(22), 46(10), 47(1) or 48(1), 2 to 3 over caudal-fin base; series of scales from dorsal-fin origin to lateral line 6(8), 7*(31) or 8(5); series of scales from lateral line to pelvic-fin base 6*(39), 6.5(3) or 7(2); total series of scales from dorsal fin to base pelvic-fin base 13(4), 14*(36), 14.5(5), 15(3) or 16(1); series of scales from lateral line to first ray of anal fin 5*(6), 5.5(8) or 6(29); circumpeduncular scales 16*(36), 17(1), 18(3) or 20(3); predorsal scales 11*(13), 12(19) or 13(10); scales from dorsal fin to adipose fin 12*(7), 13(17), 14(16) or 15(3); scales from adipose fin to caudal fin 8(3), 9(10), 10(19), 11(8) or 12*(2); prepelvic scales 18(1), 19(8), 20*(10), 21(12), 22(5), 23(4) or 24(1); scales from pelvic fin to anus 8*(13), 9(21), 10(7) or 11(2); scales from anus to anterior margin of anal fin 2(4), 3(31) or 4*(9); scales from posterior margin of anal fin to anteroventral margin of caudal fin 8(1), 9(6), 10(16), 11*(16) or 12(2). All scales of lateral line pored with canals in scales straight.

Dorsal-fin rays ii,8,ii*; pectoral-fin rays i,12(3), i,13(7), i,14*(20), i,15(9) or i,16(4); pelvic-fin rays i,8*(41) or i,9(3); anal-fin rays ii-iii,5,ii(2) or ii-iii,6,ii*(42); caudal- -fin rays i,8,9,i*(38). Total vertebrae 28(8) or 29 (2).

Coloration in alcohol. Overall coloration of specimens re- taining guanine on scales silvery to silvery golden, darker on dorsal portions of head and body. Ground coloration of specimens lacking guanine on scales tan to yellow, darker dorsally, with irregular patch of dark pigmentation extending from rear of orbit across opercle; degree of intensity of dark pigmentation and extent of patch variable among individuals. Irregular, dark longitudinal stripe extending along lateral line from supracleithrum to base of middle caudal-fin rays. Stripe slightly wider posteriorly, continuous posteriorly with dusky stripe on middle caudal-fin rays. Stripe in adults continuous, about one scale wide; not as well developed in juveniles, consisting of discrete spots surrounding pores of lateral line. Caudal-fin with stripe more prominent on the anterior portion of rays. Anterior margin and distal portions of dorsal fin typically dusky in adults. Ventral lobe and dorsal rays of dorsal lobe of caudal fin dusky. All caudal-fin rays outlined by small chromatophores on membranes. Adipose fin dusky distally. Dorsal fin with dusky anterior region in many specimens, without any discrete spot on middle rays. Other fins hyaline.

Sexual dimorphism. Secondary sexual characters were not found.

Geographical distribution. Steindachnerina nigrotaenia   is distributed along the rio Paraguai basin ( Fig. 5 View Fig ).

Material examined. All from Brazil, rio Paraguai basin. BMNH 1902.2.10.30, 43.5 mm SL, Mato Grosso , rio Coxipó, F. Silvestri. Lectotype of Curimatus nigrotaenia   (designated herein).   MSNG 14859 View Materials , 3 View Materials , 42.7 View Materials , 51.2 View Materials , 52.2 View Materials mm SL, same data as lectotype.   Paralectotypes of Curimatus nigrotaenia   (designated herein). MNRJ 11206 View Materials , 3 View Materials , 59.8 View Materials - 85.7 View Materials mm SL, Mato Grosso , Acorizal , rio Acorizal at bridge along road from Acorizal to Baús.   MNRJ 11207 View Materials , 1 View Materials , 102.0 mm SL, Mato Grosso , Acorizal , ribeirão Baús.   MNRJ 11214 View Materials , 1 View Materials , not measured, Mato Grosso , Acorizal , ribeirão Tangará , along road from Acorizal to Cuiabá.   MZUSP 4383 View Materials , 3 View Materials ;   MZUSP 4449 View Materials , 1 View Materials , 39.2 View Materials mm SL, Mato Grosso , Santo Antonio do Leverger , rio Cuiabá.   MZUSP 21512 View Materials , 16 View Materials , Mato Grosso , Cuiabá, rio Coxipó da Ponte, 15°38’S 56°03’W. GoogleMaps   MZUSP 21656 View Materials , 6 View Materials , Mato Grosso , Santo Antonio do Leverger , rio Cuiabá. GoogleMaps   MZUSP 21662 View Materials , 2 View Materials , Mato Grosso, Barão do Melgaço, rio Cuiabá, Boca do Croará, 16°11’S 55°57’W. GoogleMaps   MZUSP 38015 View Materials , 2 View Materials , Mato Grosso , Cáceres , Porto Limão. GoogleMaps   MZUSP 38079 View Materials , 1 View Materials , Mato Grosso do Sul , Coxim , rio Taquari, Ilha da Goiaba, 18°30’00”S 54°45’00”W. GoogleMaps   MZUSP 40068 View Materials , 4 View Materials , Mato Grosso do Sul , Aquidauana , rio Aquidauana, Baia da Onça or Jatobá, Fazenda Alegrete, 20°28’00”S 55°48’00”W. GoogleMaps   MZUSP 45476 View Materials , 9 View Materials , Mato Grosso, rio Paraguai at Cáceres and vicinities.   MZUSP 47762 View Materials , 130 View Materials , Mato Grosso, Barão de Melgaço , rio Cuiabá.   MZUSP 54139 View Materials , 1 View Materials , rio Apa , small bay of the river.   MZUSP 56234 View Materials , 1 View Materials , Mato Grosso, Chapada dos Guimarães, rio Casca.   MZUSP 59541 View Materials , 41 View Materials , Mato Grosso do Sul, Corumbá, rio Vermelho, Fazenda Xaroes, 19°36’73”S 56°55’42”W. GoogleMaps   MZUSP 74361 View Materials , 4 View Materials , Mato Grosso , Santo Antonio do Leverger , rio Cuiabá , 3 km from the town.   MZUSP 75480 View Materials , 2 View Materials , Mato Grosso , Cáceres, ribeirão das Flexas, along road from Cáceres to Cuiabá at about 69 km E of Cáceres.   MZUSP 78750 View Materials , 3 View Materials , Mato Grosso , Porto Estrela , rio Saloba, along road at Estação Ecológica da Serra das Araras, 15°39’03”S 57°13’29”W. GoogleMaps   MZUSP 78845 View Materials , 1 View Materials , Mato Grosso , Diamantino, downstream of waterfall in the rio Paraguai, 14°28’32”S 56°23’32”W. GoogleMaps   MZUSP 78946 View Materials , 1 View Materials , Mato Grosso   GoogleMaps , Santo Antonio do Leverger   GoogleMaps , rio Cuiabá.   GoogleMaps   MZUSP 87785 View Materials , 2 View Materials , Mato Grosso, Tangará da Serra, rio Sepotuba, salto Maciel, 15°55’59”S 57°39’00” W. GoogleMaps   MZUSP 89954 View Materials , 2 View Materials , Mato Grosso   GoogleMaps , rio Sepotuba.   MZUSP 90075 View Materials , 8 View Materials , Mato Grosso, Curvelândia, lower rio Sepotuba, 15°53’34”S 57°38’44”W. GoogleMaps   MZUSP 90181 View Materials , 14 View Materials , Mato Grosso   GoogleMaps , lower rio Sepotuba.   MZUSP 90422 View Materials , 27 View Materials , Mato Grosso, Curvelândia, rio Sepotuba, 15°46’07”S 57°38’54”W. GoogleMaps   MZUSP 90702 View Materials , 3 View Materials , Lambari d’Oeste , rio Sepotuba, at mouth of a creek, 15°10’00”S 57°41’00”W. GoogleMaps   MZUSP 91014 View Materials , 1 View Materials , Barra do Bugres , rio Sepotuba, 15°06’52”S 57°39’57”W. GoogleMaps   MZUSP 91060 View Materials , 2 View Materials , Cáceres , rio Sepotuba, artificial lagoon downstream of the bridge, 15°14’08”S 57°41’46”W. GoogleMaps   LBP 5636, 1 (tissue 27395), Mato Grosso, Cuiabá, rio Coxipó   GoogleMaps , rio Paraguai   . LBP 8573, 1 (tissue 43355), Mato Grosso , Barra do Bugres, rio Paraguai   . LBP 9818, 6 (tissues 45230–45234, Mato Grosso do Sul , Miranda, rio Paraguai. LBP 9862, 1 (tissue 45408), Mato Grosso do Sul, Miranda, rio Paraguai.  

Tab. 2. Morphometric data for Steindachnerina nigrotaenia and S. insculpta. N = number of specimens. SD = Standard deviation. Range of each species includes the lectotype of S. nigrotaenia (BMNH 1902.2.10.30) and the paratype of S. insculpta (MZUSP 1376), respectively.

    Steindachnerina nigrotaenia       Steindachnerina insculpta    
  Lectotype N Range Mean SD Paratype N Range Mean SD
Standard length (mm) 43.5 44 37.0-90.3 63.4 - 105.0 78 42.6-108.1 75.6 -
Percentages of standard length
Body depth 26.5 44 25.0-33.8 28.8 1.5 29.5 78 25.6-34.1 30.1 1.7
Caudal peduncle depth 11.0 44 10.3-11.7 11.0 0.3 11.7 78 10.8-12.4 11.7 0.4
Head length 32.0 44 25.7-32.5 29.0 1.7 18.9 78 25.6-30.2 28.1 0.8
Predorsal distance 47.2 44 44.3-49.7 46.8 1.2 46.8 78 43.3-49.7 46.2 1.2
Prepelvic distance 51.9 44 48.8-55.4 52.4 1.4 54.9 78 48.8-58.0 52.1 1.6
Pectoral-fin length 15.2 44 15.0-20.0 18.1 0.9 17.9 78 15.6-19.8 18.0 0.9
Pelvic-fin length 19.9 44 18.0-22.3 19.7 0.9 19.6 78 15.5-21.8 19.0 1.2
Percentages of head length
Eye diameter 32.4 44 27.6-34.9 30.5 1.8 27.7 78 26.3-33.5 29.8 1.7
Snout length 34.5 44 30.1-35-6 32.9 1.3 35.1 78 29.7-38.9 34.1 1.7
Interorbital distance 33.1 44 31.7-43.2 38.0 2.2 39.7 78 38.3-44.8 41.0 1.8

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Characiformes

Family

Curimatidae

Genus

Steindachnerina

Loc

Steindachnerina nigrotaenia ( Boulenger, 1902 )

Britski, Heraldo A., Melo, Bruno F., Vari, Richard P. & Oliveira, Claudio 2019
2019
Loc

Curimatus nigrotaenia

Boulenger, 1902:2
Eigenmann, 1910:421
Vari, 1989 , tables 2, 3
Tortonese, 1961:184
Litz & Koerber, 2014:9
Loc

Curimata nigrotaenia

Fernández-Yépez, 1948:73
Fowler, 1950:288
Fowler, 1975:369
Ringuelet, 1975:72
Loc

Steindachnerina nigrotaenia

Britski, 1996:74
Britski et al., 1999:72
Britski et al., 2007: 96
Polaz et al., 2014:125
Loc

Steindachnerina insculpta

Vari, 1991:71
Aguilera et al., 2018:1018
Loc

Steindachnerina brevipinna

Vari, 1991:97
Loc

Curimata nasa

Géry et al., 1987:425