Fig 1.
Holotype of Panaqolus tankei n. sp.
INPA 41135, 72.8 mm SL, Brazil, Pará, rio Xingu, 17 km south from Senador José Porfírio (02°44’54.7”S 52°00’09.5”W).
Fig 2.
Live photos of all described species of Panaqolus.
(photo credits: A. Tanke [a, b, c, l], R. Heidemann [d], I. Seidel [e, h], J. Dignall [f], J. Gottwald [g], H.-G. Evers [i], E. Bertelsen [j], and C. Cramer [k]).
Fig 3.
Ventral view of mouth of Panaqolus tankei.
(a) oral disk, (b) details of premaxillary teeth and (c) dentary teeth (photos by R. Heidemann; live aquarium specimen; ca. 85 mm SL).
Table 1.
Selected morphometric features of Panaqolus tankei.
Values are given as percent of standard length or head length. SD = standard deviation, n = number of specimens, H = holotype. Interlandmarks (ILM) are the two points between which measurements were taken (from [8]).
Fig 4.
Estimated standard lengths: (a) 14.5 mm, (b) 19.8 mm, (c) 21.4 mm, and (d) 30.0 mm (photos by I. Seidel).
Fig 5.
Variation in the body coloration of Panaqolus tankei.
a) small specimen with five compact bands (ANSP 195074, 43.5 mm SL); b) adult specimen with the 1st and 2nd bands in phase of splitting, forming a D; the 3rd band is already split into two thin bands (ANSP 195074, 78.9 mm SL); c) adult specimen with the 2nd band nearly and 3rd band completely split, the 4th band forming an inverted Y (ANSP 195074, 73.2 mm SL); d) adult specimen with the 2nd and 3rd bands completely split (INPA 40644, 65.0 mm SL).
Fig 6.
Variation of the head coloration of Panaqolus tankei.
a) compact straight lines b) partially split lines, forming an inverted Y, an elongated 0 or a sequence of 0s (both INPA 31777).
Fig 7.
Live coloration of Panaqolus tankei.
(a) from the region of Vitória do Xingu (live aquarium specimen; photo by R. Heidemann) and (b) from the region of Porto de Moz with more and finer lines on the head (live aquarium specimen; photo by A. Tanke).
Fig 8.
Distribution map of Panaqolus tankei.
Solid symbol: type locality. Symbols may represent more than one locality or lot. Inset rectangle indicates location of study area in South America.
Fig 9.
Typical habitat of Panaqolus tankei.
Riverbank in Lower Xingu.
Fig 10.
Underwater picture of the natural habitat of Panaqolus tankei.
Table 2.
Locality, collection numbers, and GenBank accession numbers of the voucher specimens and the COI sequences.