Taxonomic review of Trans-Andean species of Pimelodus (Siluriformes: Pimelodidae), with the descriptions of two new species
Author
Villa-Navarro, Francisco Antonio
Author
Acero, Arturo
Author
Cala, Plutarco Cala
text
Zootaxa
2017
4299
3
337
360
journal article
32401
10.11646/zootaxa.4299.3.2
3169a7bc-1a16-427d-9696-ae9c89da1dc9
1175-5326
843239
7838D461-3D2E-4034-8CA1-ECFE7BD58736
Pimelodus crypticus
,
new species
, Villa-Navarro & Cala
Holotype
:
CZUT-IC
1986, 209.3
mm SL (XR),
Colombia
, Departament of
Cauca
,
Timba
,
Cauca River
,
La Balastrera
sector,
03° 03’ 03’’N
,
76° 39’ 56’’W
,
1 Sep 2000
,
F. A. Villa-Navarro.
Paratypes
:
CZUT-IC
1983
(4, 138.0–246.0 mm LS) collected with holotype
;
CZUT-IC
1991
(5 XR,
119.89– 246.04 mm
SL) collected with holotype
;
CZUT-IC
1992
(2 XR, 194.8–
185.8 mm
SL) collected with holotype
;
CZUT-IC
1992
(1 C&S,
65 mm
SL) collected with holotype
;
CZUT-IC
2011
(
1, 237.6 mm
SL) collected with holotype
;
IAvH 10807
(
1, 128.93 mm
SL) collected with holotype
;
CZUT-IC
1818
(1 SK,
135.1 mm
SL),
Colombia
,
Valle del Cauca
,
Cauca River
,
El Hormiguero
sector,
03° 18’ 53’’ N
,
76° 28’ 37” W
;
CZUT-IC
1819
(1 SK,
157.5 mm
SL),
Colombia
,
Valle del Cauca
,
Cauca River
,
El Hormiguero
sector,
03° 18’ 53’’ N
,
76° 28’ 37” W
;
CZUT-IC
1820
(1 SK, 120.0 mm SL),
Colombia
,
Valle del Cauca
,
Cauca River
,
El Hormiguero
sector,
03° 18’ 53’’ N
,
76° 28’ 37” W
;
CZUT-IC
1821
(1 SK,
125.5 mm
SL),
Colombia
,
Valle del Cauca
,
Cauca River
,
El Hormiguero
sector,
03° 18’ 53’’ N
,
76° 28’ 37” W
; ICNMHN 16391 (
1, 181.21 mm
SL);
IMCN
286
(6, 163.01 -
200.76 mm
SL),
Colombia
,
Cauca
,
Suarez
,
Ovejas River
,
Nov 1995
,
S. Usma
;
IMCN
3555
(
1, 164.21 mm
SL),
Colombia
,
Valle del Cauca
,
El Hormiguero
sector,
Cauca River
,
12 Oct 2002
,
A. Ortega-Lara.
FIGURE 14.
Pimelodus crypticus
CZUT-IC 1986 Holotype, 209.3 mm SL, Cauca River, La Balastrera sector, Timba, Departament of Cauca, Colombia. Photo by J. E. García-Melo
Diagnosis.
Pimelodus crypticus
differs from all trans-Andean
Pimelodus
species except
P. grosskopfii
, in having a long adipose fin (23.4–28.8% SL vs. 14.1–22.5% SL); and differs from all trans-Andean
Pimelodus
species except
P. yuma
n. sp.
, in having a uniform color pattern, without spots or stripes on the body, fins, the dorsal surface of the head and supraoccipital process (vs. dark spots present).
Pimelodus crypticus
differs from
P. grosskopfii
in having a longer predorsal distance (37.5–40.7% SL vs. 33.0–37.3% SL) (
Fig. 15
) and a longer head (26.4–30.4% SL vs. 22.8–25.9% SL); and from
P. blochii
in having a longer adipose fin (23.4–28.8% SL vs. 17.0– 22.6% SL) and a smaller eye (14.8–21.6% HL vs. 22.1–27.5% HL).
Description.
N=13. Morphometric data presented in Table 2. Body deeper than wide; roof of cranium ornamented with small (but visible) smooth granules. Eye diameter less than interorbital width. Snout convex, projected beyond mandibular symphysis. Mouth subterminal, when closed leaving more than one half of premaxillary tooth patch exposed; those teeth conical, small and narrow. Fontanel opened from mesethmoids to frontals, ending at vertical through posterior third of eye. Maxillary barbels reach base of anal fin, sometimes surpassing base of last anal-fin ray; inner mental barbels reaching pectoral-fin bases; external mental barbels reaching pelvic-fin bases.
Dorsal fin lepidotrichia II,6; the first a spinelet narrow and angular, spine strong, slightly curved and sharply pointed. Adipose fin long, its margin rectangular, its anterior apex at vertical through base of first or second branched anal-fin ray. Pectoral fins (I,8); spine strong sharply pointed and forming slight arc. Pelvic fins i,5; first branched ray longest, fins inserted at vertical through base of penultimate dorsal-fin ray. Anal fin iii,7-9 with first branched ray longest. Caudal fin i,15,i; forked, lobes pointed, dorsal lobe equal or slightly longer than ventral.
Lateral line complete, extending beyond base of caudal fin for half-length of middle caudal-fin rays. Cleithral process extensive, strong, triangular, posterodorsal margin concave, ventral margin straight. Apparently without sexual dimorphism.
Color in alcohol.
(
Fig. 14
) Body and head, including cheeks, snout and cleithral process dark tan, posterior third of sides of body above lateral line gray. Lateral line tan or white, ventral region light tan or whitish, without stripes or spots. Base of dorsal-fin spine dark. Fins yellow, lighter distally; margins of dorsal and adipose fins black; ventral lobe without dark diffuse stripe. Dorsal surface of maxillary barbels tan.
Distribution.
Cauca
River from La
Virginia
(
Risaralda Department
) to La Salvajina reservoir (
Cauca Department
) (
Fig. 4
).
Etymology.
The name
crypticus
is Greek for hidden, this species having been hidden as consequence of the prior confusion between this new species in the
Cauca
river and
P. yuma
new species
.