Poropuntius alloiopleurus (Vaillant, 1893)

Hoang, Huy Duc, Pham, Hung Manh, Tran, Ngan Trong, Durand, Jean-Dominique, Wu, Ling, Pfeiffer, John, Chen, Xiao-Yong & Page, Lawrence M., 2024, Taxonomic revision of the Southeast Asian brook barb genus Poropuntius Smith, 1931 (Teleostei, Cyprinidae) with description of a new species from Vietnam, ZooKeys 1204, pp. 199-222 : 199-222

Poropuntius alloiopleurus (Vaillant, 1893)

Barbus alloiopleurus Vaillant, 1893: 201 . Type locality: Vietnam, Tonkin, Black River . Holotype: MNHN 1892-0261 .

Barbodes (Barbodes) huangchuchieni rhomboides Wu & Lin, in Wu et al. 1977: 248 , pl. 7–8. Type locality: China, Yunnan, Yuanjiang River . Syntypes (15): KIZ 645614 -15, 645617-19 , 645622 , 645624 , 6440093 , 6440392 , 6440461 , 6440564 , 6450172 , 6450191 , 6450207 , 6450322 .

Poropuntius baolacensis (Nguyen, in Nguy ễn and Ngô 2001): 387 , fig. 189. Type locality: Vietnam, Cao Bang Province, Nho Que, Bao Lac [22 ° 56 ' 60 " N, 105 ° 40 ' 00 " E], Song Hong River drainage. Holotype: VNCNTTS H. 01.72.13.01 .

Poropuntius brevispinus (Nguy ễn & Đoàn, 1969) : 12, fig. 7. Type locality: Vietnam, Hoa Binh Province, Suoi Rut stream . Syntypes (3): NCNTTSI H. 01.72.10.01 - 03 .

Acrossocheilus macrophthalmus Nguyen, in Nguy ễn and Ngô 2001: 390, fig. 191. Type locality: Vietnam, Hoa Binh Province, Da Bac District, Da River at Thac Bo. Holotype: NCNTTSI H. 01.72.14.01.

Acrossocheilus xamensis Kottelat, 2000: 38, fig. 1. Type locality: Laos, Houaphan Province, Houay Tangoua, small stream entering Nam Xam in Ban Houay Tangoua, 20 ° 09 ' 24 " N, 104 ° 32 ' 50 " E. Holotype: ZRC 45297.

Notes.

Specimens of Poropuntius alloiopleurus (Fig. 3 C ) were recovered in a clade including topotypic material of Acrossocheilus macrophthalmus , A. xamensis , Barbodes huangchuchieni rhomboides , Poropuntius baolacensis , and P. brevispinus and was sister to a clade including P. heterolepidotus , P. huangchuchieni , and P. laoensis (Fig. 2 A ).

Kottelat (2000) noted that Acrossocheilus xamensis resembles Poropuntius but lacks the branched lateral-line canals diagnostic of Poropuntius . Our 12 specimens of P. alloiopleurus are missing branched lateral-line canals; branched canals are variable within Poropuntius and do not distinguish Poropuntius from Acrossocheilus . A paratype of A. xamensis exhibits the typical caudal-fin characteristic of Poropuntius , a dark marginal stripe along the lower lobe ( Kottelat 2000, fig. 1).

According to Nguy ễn (2001), A. macrophthalmus resembles P. alloiopleurus but has an eye diameter longer than the snout. Our 12 specimens of P. alloiopleurus have eye diameters that are shorter or longer than the snout.

Nguy ễn and Ngô (2001) distinguished P. baolacensis from P. brevispinus in having 28–30 vs 18–22 serrae along the posterior margin of the last simple dorsal-fin ray. Our 12 specimens of P. alloiopleurus have 20–29 serrae on the last dorsal-fin ray, partially overlapping the serrae counts given to distinguish P. baolacensis and P. brevispinus .

Distribution.

Poropuntius alloiopleurus is found in the Song Hong ecoregion.

Figures

Figure 2. Maximum-likelihood tree based on (A) COI and (B) Cyt b mitochondrial gene sequences for species of Poropuntius. Numbers on branches are ML bootstrap values (values > 50 % shown). Bold sample labels are sequences from type localities. Blue sample labels in the Cyt b tree are sequences from Wu et al. (2013). Colours of clades correspond to the freshwater ecoregions in Fig. 1.

Figure 3. Species of Poropuntius. Poropuntius krempfi from A Song Hong ecoregion, UNS 2018-1410 B northern Annam, UNS 2018-2702; P. alloiopleurus from C Song Hong, UNS 2018-3010; P. laoensis from D upper Sekong’s tributary, UNS 2018-0404 E upper Sekong’s pool, UNS 2018-0304; P. huangchuchieni from F Lower Lancang, UNS 2018-0711. All photographed in life. Scale bars: 10 mm.