Potamotrygon tigrina, a new species of freshwater stingray from the upper Amazon basin, closely related to Potamotrygon schroederi Fernandez-Yépez, 1958 (Chondrichthyes: Potamotrygonidae) Author De, Marcelo R. Author Sabaj, Mark H. Author Lovejoy, Nathan R. text Zootaxa 2011 2827 1 30 journal article 47519 10.5281/zenodo.319945 9bab498f-550c-402a-b52e-e35b8880c5d4 1175-5326 319945

TABLE 1. Measurements of specimens of Potamotrygon tigrina, n. sp. A: MUSM 39978 (holotype), juvenile male. B: ANSP 191988 (paratype), preadult female. x: mean. * branchial basket removed in holotype; caudal stings lacking in specimen when captured.

PARAMETER	A	B	x
	mm % DW	mm % DW	mm % DW
total length (TL)	495.0 –	560.0 –	527.5 –
disc length (DL)	271.0 105.0	282.0 112.8	276.5 108.9
disc width (DW)	258.0 100.0	250.0 100.0	254.0 100.0
Interorbital distance	34.0 13.2	22.0 8.8	28.0 11.0
interspiracular distance	43.0 16.7	34.0 13.6	38.5 15.1
eye length	22.0 8.5	12.0 4.8	17.0 6.7
spiracle length	30.0 11.6	21.0 8.4	25.5 10.0
preorbital length	70.0 27.1	67.0 26.8	68.5 27.0
prenasal length	47.0 18.2	40.0 16.0	43.5 17.1
preoral length	61.0 23.6	55.0 22.0	58.0 22.8
internarial distance	28.0 10.9	20.0 8.0	24.0 9.4
mouth width distance between 1st gill slits distance between 5th gill slits branchial basket length	33.0 12.8 * – * – * –	24.0 9.6 56.0 22.4 40.0 16.0 47.0 18.8	28.5 11.2 – – – – – –
pelvic fin anterior margin length	65.0 25.2	65.0 26.0	65.0 25.6
pelvic fins width clasper external length clasper internal length	153.0 59.3 6.0 2.3 34.0 13.2	150.0 60.0 – – – –	151.5 59.7 – – – –
distance between cloaca and tail tip	279.0 108.1	328.0 131.2	303.5 119.7
tail width	47.0 18.2	39.0 15.6	43.0 16.9
snout to cloaca distance	225.0 87.2	228.0 91.2	226.5 89.2
pectoral to posterior pelvic length distance from cloaca to sting origin sting length sting width	39.0 15.1 * – * – * –	29.0 11.6 144.0 57.6 4.9 2.0 0.4 1.2	34.0 13.4 – – – – – –