Bioacoustics of Poropuntius krempfi

Notes. Specimens of Poropuntius krempfi (Fig. 3 A, B ) were recovered in a clade including topotypic material of Barbus annamensis and Lissochilus macrosquamatus . The clade was sister to a large clade including P. alloiopleurus , P. heterolepidotus , P. huangchuchieni , P. laoensis , and P. opisthopterus (Fig. 2 A ). Specimens of P. krempfi from northern Annam ( MNHN 1935: 0337, MNHN 1969: 42) were assigned by Rainboth (1996) to Hypsibarbus annamensis presumably due to the presence of a few tiny tubercles on the tip of the snout, but this trait is not useful for separating all species of the two genera. Some of our 41 specimens of P. krempfi have tiny tubercles on the tip of the snout. Rainboth (1996) noted that this species was unusual in being the only species of Hypsibarbus on the coastal side of the Annam Cordillera and in having a much longer dorsal spine with 26–28 serrations, compared to 20 or fewer in other species in the Mekong River drainage. Hypsibarbus macrosquamatus from Song Hong, northern Vietnam ( type : DVZUT ) described by Mai (1978) and treated as Acrossocheilus macrosquamatus by Nguy ễn and Ngô (2001) resembles our P. krempfi specimens from northern Annam with a lateral-line scale count of 29–33.