Lasiancistrus caucanus Eigenmann, 1912

Armbruster, Jonathan W., 2005, The loricariid catfish genus Lasiancistrus (Siluriformes) with descriptions of two new species, Neotropical Ichthyology 3 (4), pp. 549-569: 553-555

publication ID

http://doi.org/ 10.1590/S1679-62252005000400013

publication LSID

lsid:zoobank.org:pub:CC3E5EBD-AEB8-40A9-AE1D-4F1BF44D72BC

persistent identifier

http://treatment.plazi.org/id/03921F68-FFF2-FF8B-9DE0-FF61FA7718B0

treatment provided by

Carolina

scientific name

Lasiancistrus caucanus Eigenmann, 1912
status

 

Lasiancistrus caucanus Eigenmann, 1912   Fig. 4 View Fig

Lasiancistrus caucanus Eigenmann, 1912:11   .Cartago, Colombia, C. H. Eigenmann, Jan-Mar 1912.

Hemiancistrus mayoloi Eigenmann, 1912:10   . Río San Juan   GoogleMaps , Ismina, Colombia, 5°11’N, 76°39’W.

Ancistrus planiceps Meek & Hildebrand, 1913:79   . Río Tuyra, Boca de Cupe, Panama.

Lasiancistrus volcanensis Dahl, 1942: 83   . Río Volcán near its junction to río San Bartolomé, tributary of río Magdalena, Antioquia Dep., Colombia.

Material Examined. Colombia. State not given   : FMNH 56034 View Materials , 1, 133.7 mm   SL, holotype of L. caucanus   , and   FMNH 56035 View Materials , 4 View Materials , 77.9- 132.9 mm   SL, paratypes of L. caucanus, Cartago, Jan-Mar 1912     . FMNH 56037 View Materials , 2 View Materials , 62.5-85.7 mm   SL, paratypes of L. mayoloi, Istmina   , 18 Mar 1912   . FMNH 58519 View Materials , 1, 105.4 mm   SL, Piedra Moler , 21 Feb 1912   . FMNH 58560 View Materials , 1 View Materials , 54.3 mm   SL, Paila , 1913   . FMNH 58561 View Materials , 0, Bernal Creek near Honda, 1913   . FMNH 76219 View Materials , 1 View Materials , 79.7 mm   SL, no locality. USNM 120723 View Materials , 1 View Materials , 57.6 m   SL, río Ariguanicito tributary of río Cesar, 24 Mar 1942   . USNM 308485 View Materials , 1 View Materials , 52.4 mm   SL, río Salado, 4 miles above confluence with río Truando , 15 Mar 1967   . USNM 175318 View Materials , 2 View Materials , 75.7-91.9 mm   SL, Batatal, río Ure , San Jorge, 23 Dec 1950   . Valle del Cauca, río Cauca - río Magdalena drainage: MCZ 35812 View Materials , 1 View Materials , 80.4 mm   SL, upper río Cauca and tributaries, Oct 1942   . MCZ 35871 View Materials , 1 View Materials , 44.5 mm   SL, upper Cauca, río Frío , 18 Oct 1942   . USNM 120155 View Materials , 1 View Materials , 73.5 mm   SL, upper Cauca, río Frío , 18 Oct 1942   . Caldas, río Cauca drainage: ANSP 134248 View Materials , 7 View Materials , 88.1-139.4 mm   SL, río Mercedes , 1.5 hr drive from Hacienda Sonadora, 23 Mar 1973   . Choco   : ANSP 88385 View Materials , 4 View Materials , 171.1 View Materials - 187.8 mm   SL, upper río Jaredo, Pacific Slope , elevation 600 ft., Oct 1940   . FMNH 56036 View Materials , 1 View Materials , 92.7 mm   SL, holotype of L. mayoloi   , upper río Jaredo , Pacific Slope, 18-20 Mar 1912   . USNM 308484 View Materials , 2 View Materials , 35.4 View Materials - 41.0 mm   SL, río Atrato drainage, small river (río Cuti?) near Santa Maria La Nueva , lower Atrato , 29 Aug 1967   . USNM 308486 View Materials . 2, 57.8- 71.8 mm   SL, creek of upper río Nercua, large tributary of río Truando , 28 Aug 1967   . USNM 308487 View Materials , 1 View Materials , 1 View Materials c&s, 99.0 mm   SL, río Salado near Teresita , 8 Feb 1968   . Santander, río Magdalena drainage: SIUC 34914 View Materials , 92.3 mm   SL, no precise locality given, Nov 1998   . Panama. State not given   : USNM 280395 View Materials , 2 View Materials , 96.2-119.9 mm   SL, Atlantic Ocean drainage, Comarca KunaYala, río Cangandio Mandinga confluence area, 09°26’N, 79°05’W, 6-10 Feb 1986 GoogleMaps   . USNM 308482 View Materials , 1, 117.1 mm   SL, río Chucanaque, Pacific Ocean drainage, 09°02’N, 78°02’W, 1 Mar 1967 GoogleMaps   . USNM 308492 View Materials , 4 View Materials , 137.1 View Materials - 187.9 mm   SL, río Pirre, Pacific Ocean drainage, 3-5 miles above El Real, purchased (caught on line), 23-27 Feb 1967   . Darien, Pacific Ocean drainage   : FMNH 26290 View Materials , 1, 190.4 mm   SL, paratype of L. planiceps   , río Tuyra, at mouth of río Yape , 6 Mar 1912   . FMNH 26291 View Materials , 1, 127.3 mm   SL, paratype of L. planiceps   , río Tuyra, Boca de Cupe , 26 Feb 1912   . FMNH 26292 View Materials , 1 View Materials , 77.9 mm   SL, paratype of L. planiceps   , río Grande , Cana, 3 Mar 1912   . FMNH 26293 View Materials , 1 View Materials , 82.5 mm   SL, paratype of L. planiceps   , río Cana , Cana, 1 Mar 1912   . FMNH 29291 View Materials , 1, 137.4 mm   SL, paratype of L. planiceps   , río Tuyra, Boca de Cupe , 28 Feb 1912   . FMNH 29292 View Materials , 1, 130.8 mm   SL, paratype of L. planiceps   , río Tuyra, Boca de Cupe , 28 Feb 1912   . FMNH 29293 View Materials , 1, 178.1 mm   SL, paratype of L. planiceps   , río Tuyra, Boca de Cupe , 28 Feb 1912   . FMNH 7580 View Materials , 1, 147.6 mm   SL, holotype of L. planiceps   , río Tuyra, Boca de Cupe , 26 Feb 1912   . MCZ 88614 View Materials , 2 View Materials , 62.2-86.8 mm   SL, río Pucuro, 3-4 km above confluence with río Tuira , 8°0’N, 77°31’W, 17 Feb 1985 GoogleMaps   . USNM 078309 View Materials , 1 View Materials , 43.9 View Materials - 101.7 View Materials , río Grande , Cana, 3 Mar 1912   . USNM 078311 View Materials , 2 View Materials , 121.2 View Materials - 177.1 mm   SL, río Tuyra, mouth of río Yape , 6 Mar 1912   . USNM 280394 View Materials , 1, 125.3 mm   SL, río Tuira, between Calle Larga and Pinogana above El Real , 08°07’N, 077°42’W, 18 Feb 1985 GoogleMaps   . USNM 293415 View Materials , 4 View Materials , 1 View Materials c&s, 47.6-123.4 mm   SL, río Pucuro just above confluence with río Tuira , 08°00’N, 077°32’W, 16-18 Feb 1985 GoogleMaps   . USNM 293418 View Materials , 1 View Materials , 138.0 mm   SL, río Tuira , 0.5 km above Boca de Cupe, 08°03’N, 077°06’W, 18 Feb 1985 GoogleMaps   . Panama, río Bayano - Pacific Ocean drainage   : ANSP 151026 View Materials , 9 View Materials , 62.7-85.3 mm   SL, río Canitas at IAH about 10.4 km W of Bayano bridge, 31 Jan 1983   . MCZ 57075 View Materials , 1 View Materials , 84.6 mm   SL, probably río Canita , on large rock ledge 0.5 km upriver of construction camp and headquarters, 1 Apr 1978   . USNM 308490 View Materials , 3 View Materials , 122.8 View Materials - 175.7 mm   SL, río Membrillo , 22 Mar 1967   .

Diagnosis. Lasiancistrus caucanus   is distinguished from all other species of Lasiancistrus   except L. saetiger   , L. tentaculatus   , and some L. schomburgkii   by the absence of plates ventrally in front of the anus and from all Lasiancistrus   except some L. guacharote   by having the caudal fin slightly emarginate (vs. forked; Fig. 4 View Fig ). Additionally, L. caucanus   can be separated from L. schomburgkii   and L. saetiger   by having dark spots in the dorsal fin (vs. dorsal fin all gray or with white spots); from L. tentaculatus   by having tentacules along the snout that are shorter than their associated odontodes in nuptial males (vs. longer in nuptial males), and by having whiskerlike odontodes at the anterior corner of the snout in nuptial males (vs. whiskerlike odontodes absent, Fig. 2a View Fig ).

Description. See genus description for more information. Morphometrics in Table 1. Largest specimen 190.4 mm SL. Abdomen naked. 21-25 (mode = 24) plates in median series. 4- 35 whiskerlike odontodes in evertible cheek mass (mode = 11, N = 49); 21-76 (mode = 39, N = 57) total hypertrophied odontodes in cheek mass.

Color. Color variable. Body typically light brown with dark, wavy stripes that may break up into dashes or spots posteriorly. Light areas occasionally exist as spots rather than background color. Head mottled or with light spots. Body and head sometimes uniformly dark.Abdomen uniformly light tan, lower surface of caudal peduncle darker than abdomen. Dorsal fin with large, rectangular spots centered and darkest on fin rays, almost combing to form bands. Paired, caudal, and anal fins with narrow bands. Lower half of caudal fin slightly darker than upper. Adipose fin uniformly dark. Color darkens with size.

Sexual dimorphism. Nuptial males with whiskerlike odontodes at the anterolateral corner of the snout, else as in genus description.

Range. Lasiancistrus caucanus   has a trans-Andean distribution in the ríos Magdalena, Atrato, San Juan, Tuyra, and Bayano drainages of Colombia and Panamá ( Fig. 3 View Fig ).

Comments: Lasiancistrus caucanus   and L. mayoloi   were both described by Eigenmann (1912); however, L. mayoloi   was described in Hemiancistrus   . Because L. caucanus   was described in the correct genus and L. mayoloi   was not, L. caucanus   was chosen as the valid name for the species. The type of Lasiancistrus volcanensis   was not examined; however, no significant differences could be found in any of specimens examined from west of Lago Maracaibo. The figures in Dahl (1942) appear identical to all other specimens collected in the region, so L. volcanensis   is listed as a synonym of L. caucanus   .

Most specimens available have the colors faded, but those that do have color left show little variation across the trans- Andean region they occupy and no other characteristics could be found to support any of the species listed above as synonyms. The only difference in color pattern is from specimens collected from the río Bayano, the furthest west river in the range of L. caucanus   in Panamá. These specimens have the light areas of the body as spots instead of forming a light background; however, the other elements of the color pattern are as in the rest of the species. Few specimens are available from the Bayano to make comparisons, so it is unknown if this population would require separate species status.

SL

University of Sierra Leone, Njala University College

MCZ

Museum of Comparative Zoology

W

Naturhistorisches Museum Wien

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Siluriformes

Family

Loricariidae

Genus

Lasiancistrus

Loc

Lasiancistrus caucanus Eigenmann, 1912

Armbruster, Jonathan W. 2005
2005
Loc

Lasiancistrus volcanensis

Dahl, G 1942: 83
1942
Loc

Lasiancistrus caucanus

Eigenmann, C 1912: 11
1912
Loc

Hemiancistrus mayoloi

Eigenmann, C 1912: 10
1912