AKYSIDAE Gill, 1861

Published, First, 2007, Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types, Zootaxa 1418, pp. 1-628 : 12-17

AKYSIDAE Gill, 1861

Akyses Gill, 1861c: 52. Type genus: Akysis Bleeker, 1858 .

Parakysidae Roberts, 1989a: 141 . Type genus: Parakysis Herre, 1940 .

Acrochordonichthyini de Pinna, 1996: 61. Type genus: Acrochordonichthys Bleeker, 1857 .

Monophyly and phylogenetic position: de Pinna (1996).

Identification guide: Jayaram (1977d), South Asia.

5 genera, 47 species; no named fossil taxa.

ACROCHORDONICHTHYS Bleeker, 1857

Acrochordonichthys Bleeker, 1857b: 473 . Type species: Pimelodus melanogaster Bleeker, 1854 . Type by present designation. Gender: Masculine.

Sosia Vaillant, 1902: 81 . Type species: Sosia chamaeleon Vaillant, 1902 . Type by monotypy. Gender: Feminine.

Revision: Ng & Ng (2001).

Remarks: Earlier statements (e. g., Eschmeyer, 1990, 1998; Ng & Ng, 2001) indicating that the type of Acrochordonichthys as A. platycephalus Bleeker, 1858 , are in error. They were based on a type designation in Bleeker (1862-63) which was of a species that was not among the available named species when Acrochordonichthys was proposed. Apparently, no valid designation of a type species have been made before now.

Acrochordonichthys chamaeleon (Vaillant, 1902)

Sosia chamaeleon Vaillant, 1902: 82 , figs. 19–21. Type locality: Borneo: Raoen/Mandai. Lectotype: RMNH 7849 , designated by Ng & Ng (2001: 406).

Distribution: Kapuas River basin, western Borneo (Ng & Ng, 2001).

Acrochordonichthys falcifer Ng & Ng, 2001

Acrochordonichthys falcifer Ng & Ng, 2001: 408 , figs. 5–6. Type locality: Borneo: Sabah, Sungai Segama. Holotype: ZRC 43321.

Distribution: Kinabatangan and Segama River basins, northeastern Borneo (Ng & Ng, 2001).

Acrochordonichthys guttatus Ng & Ng, 2001

Acrochordonichthys guttatus Ng & Ng, 2001: 394 , figs. 6–8, 10. Type locality: Borneo: Kalimantan Tengah, Barito River drainage, Sungai Barito at Muara Laung. Holotype: MZB 9301 .

Distribution: Barito River basin, southern Borneo (Ng & Ng, 2001).

Acrochordonichthys gyrinus Vidthayanon & Ng, 2003

Acrochordonichthys gyrinus Vidthayanon & Ng, 2003: 2 , fig. 1. Type locality: Thailand: Phitsanulok Province, Yom River at Primpiram; the Inland fishery Station of Phitsanulok Province. Holotype: NIFI 2645 .

Distribution: Yom River, Chao Phraya basin, Thailand (Vidthayanon & Ng, 2003).

Acrochordonichthys ischnosoma Bleeker, 1858

Acrochordonichthys ischnosoma Bleeker, 1858b: 232 . Type locality: Java (Parongkalong provinciae Preanger), in flumine Tjitarum. Holotype (115 mm TL): BMNH 1863.12 .4.151, illustrated in Bleeker (1862–63: pl. 84 [=Silur. pl. 36], fig. 4), and Ng & Ng (2001: fig. 4).

Distribution: Sumatra and Java (Ng & Tan, 2002).

Remarks: Redescribed in Ng & Tan (2002). Catalog number of holotype of Acrochordonichthys ischnosoma incorrectly reported as BMNH 1863.12. 11.151 in Eschmeyer et al. (1998) and Ng & Ng (2001).

Acrochordonichthys mahakamensis Ng & Ng, 2001

Acrochordonichthys mahakamensis Ng & Ng, 2001: 400 , figs. 6–7, 11. Type locality: Borneo: Kalimantan Timur, Mahakam River, boulders upstream of Melak (0º12'S, 115º47'E). Holotype: MZB 5952 .

Distribution: Mahakam River, eastern Borneo (Ng & Ng, 2001).

Acrochordonichthys pachyderma Vaillant, 1902

Acrochordonichthys pachyderma Vaillant, 1902: 66 , figs. 11–13. Type locality: Bloeoe , Bornéo central. Holotype: RMNH 7843 (1).

Distribution: Kapuas, Mahakam and Kinabatangan River basins, Borneo (Ng & Ng, 2001).

Remarks: RMNH 7560, from the Bo River, is incorrectly listed as a syntype in Ng & Ng (2001) and Eschmeyer et al. (1998).

Acrochordonichthys rugosus (Bleeker, 1847)

Pimelodus rugosus Bleeker, 1847b: 11 (and 1847a: 168). Type locality: Java. Possible syntypes: BMNH 1863.12 . 4.150 (1), BMNH 1863.12 . 4.161 (1), RMNH 6883 (2).

Pimelodus melanogaster Bleeker, 1854a: 89 . Type locality: Sumatra orientalis, provinc. Palembang, ubi confluunt flumina Lamatang et Enim. Holotype (110 mm TL): possibly BMNH 1863.12 .4.160 (see Ng & Ng: 2001: 413); holotype illustrated in Bleeker (1862–63: 67, pl. 84 [= Silur. 36], fig. 3) as Acrochordonichthys melanogaster .

Pimelodus pleurostigma Bleeker, 1854b: 442 . Type locality: Batavia, in fluviis. Syntypes (8, 48– 76 mm TL): BMNH 1863.12 .4.161 (1), NMV 45993 (1) , RMNH 4188 (1) , RMNH 6879 (4).

Pimelodus zonatus Bleeker, 1854b: 444 . Type locality: Batavia, in fluviis. Syntypes (9, 54– 80 mm TL): BMNH 1863.12 .4.175 (1), NMV 45992 (1), RMNH 6880 (5). One syntype illustrated in Bleeker (1862–63: 69, pl. 84 [=Silur. 36], fig. 5), as Acrochordonichthys zonatus .

Acrochordonichthys platycephalus Bleeker, 1858b: 224 . Type locality: Sumatra (Palembang) in fluviis. Holotype (97 mm TL): BMNH 1863.12.4.152; illustrated in Bleeker (1862–63: pl. 84 [= Silur. 36], fig. 2).

Sosia chamaeleon pallida Vaillant, 1902: 87 , figs. 22–24. Type locality: Kapoeas , la plupart du haut du Fleuve (Sous-bassins du Mandaiet du Sibau), Bornéo central. Lectotype: RMNH 7848 , designated by Ng & Ng (2001: 406). Originally Sosia chamaeleon var. pallida .

Acrochordonichthys Büttikoferi Popta, 1904: 188 . Type locality: le Bongan et le Bo, Bornéo central. Syntypes: RMNH 7557 (1), RMNH 7558 (2); described in more detail, with an illustration of one of the syntypes, in Popta (1906: pl. 3, figs. 12a, 12b).

Acrochordonichthys obscurus Popta, 1904: 187 . Type locality: le Bongan, Bornéo central. Holotype: RMNH 7556 ; described in more detail, with an illustration of the holotype, in Popta (1906: 58, pl. 3, figs. 11a, 11b).

Acrochordonichthys varius Popta, 1904: 189 . Type locality: le Bo, Bornéo central. Syntypes: RMNH 7559 (2); described in more detail, with an illustration of one of the syntypes, in Popta (1906: 63, pl. 4, figs. 13a, 13b).

Distribution: Solo, Ciliwung, Citarum River basins, Java; Barito, Kapuas, Mahakam and Rajang River basins, Borneo; Bernam, Terengganu, Mae Nam Sungai Kolok and Pattani River basins, peninsular Malaysia and Thailand; Musi and Tulangbawan River basins, Sumatra (Ng & Ng, 2001).

Remarks: See comments in Ng & Ng (2001: 413) regarding the difficulty in identifying types of species named by Bleeker. Register number of BMNH types of Pimelodus rugosus , P. pleurostigma , P. melanogaster , P. zonatus , and A. platycephalus incorrectly reported in Eschmeyer et al. (1998) and Ng & Ng (2001).

Acrochordonichthys septentrionalis Ng & Ng, 2001

Acrochordonichthys septentrionalis Ng & Ng, 2001: 401 , figs. 6, 12. Type locality: Thailand: Kanchanaburi Province, Kwae Noi River . Holotype: NIFI 3128 .

Distribution: Mae Khlong River basin, Thailand, and Pahang River basin, Malaysia (Ng & Ng, 2001).

Acrochordonichthys strigosus Ng & Ng, 2001

Acrochordonichthys strigosus Ng & Ng, 2001: 403 , figs. 5–6, 8, 13. Type locality: Borneo: Kalimantan Barat, Sungai Sibau, Mouth of Sungai Putan to 3 km downstream (1º02'28.0"N, 112º59'58.6"E). Holotype: MZB 9333 .

Distribution: Kapuas River basin, western Borneo (Ng & Ng, 2001).

AKYSIS Bleeker, 1858

Akysis Bleeker, 1858b: 204 , 234 (and 1858d: 419). Type species: Pimelodus variegatus Bleeker, 1846 . Type by monotypy. Gender: Masculine.

Reviews: Ng & Kottelat (1998c, Indochina, with key to species); Ng (1999e, Myanmar).

Akysis brachybarbatus Chen, 1981

Akysis brachybarbatus Chen , in He & Chen, 1981: 210, fig. 2. Type locality: Nanrui River , Mekong River system, Manglian Co., Yunnan, China. Holotype: KIZ 787162 .

Distribution: Lancangjiang [= Mekong River] tributaries, China (Chu et al., 1999).

Akysis clavulus Ng & Freyhof, 2003

Akysis clavulus Ng & Freyhof, 2003: 312 , figs. 1–2. Type locality: Vietnam: Khanh Hoa province: Song Duc My about 10 km west of Ninh Hoa ; 12º32.22'N, 109º01.38'E. Holotype: ZFMK 27159 .

Distribution: Cai and Duc My rivers, central Vietnam (Ng & Freyhof, 2003).

Akysis clinatus Ng & Rainboth, 2005

Akysis clinatus Ng & Rainboth, 2005: 34 , fig. 1. Type locality: Cambodia: Stung Chhay River , Tok Kong village on road from Phnom Penh to Skhanoukville, 10º56'37.8"N 113º47'47.4"E. Holotype: ZRC 47288.

Distribution: Stung Chhay River, a Gulf of Thailand draining basin, Cambodia (Ng & Rainboth, 2005: 35).

Akysis ephippifer Ng & Kottelat, 1998

Akysis ephippifer Ng & Kottelat, 1998c: 1078 , fig. 11. Type locality: Cambodia: Stung Santréa , 40 km from Pomnac. Holotype: MNHN 1977-0034 .

Distribution: Xe Kong basin, Lower Mekong drainage, Laos and Cambodia (Ng & Kottelat, 1998c).

Akysis fuliginatus Ng & Rainboth, 2005

Akysis fuliginatus Ng & Rainboth, 2005: 35 , fig. 4. Type locality: Cambodia: Stung Treng province, Mekong River on W edge of Kaoh Han , 16 km NE of Stung Treng, 13º38'N 106º3'E. Holotype: UMMZ 241338 .

Distribution: Lower Mekong River basin, Cambodia (Ng & Rainboth, 2005: 37).

Akysis hendricksoni Alfred, 1966

Akysis hendricksoni Alfred, 1966: 467 , fig. 1. Type locality: Terengganu River at Kuala Brang , Terengganu, Malaya. Holotype: ZRC 1414 .

Distribution: Sungai Golok, Sungai, Terengganu, Sabak Bernam, and Endau basins, peninsular Malaysia and Thailand (Ng & Tan, 1999).

Akysis heterurus Ng, 1996

Akysis heterurus Ng, 1996: 4 , figs. 1–2. Type locality: Sumatra: Jambi, Sg. Alai at 19.5 km Muara Bungo-Muara Tebo road. Holotype: ZRC 34194.

Distribution: Batang Hari River basin, eastern Sumatra (Ng, 1996).

Akysis maculipinnis Fowler, 1934

Akysis maculipinnis Fowler, 1934a: 97 , fig. 46. Type locality: Chantaboon , Southeast Siam. Holotype: ANSP 59366 .

Distribution: Rivers of southeastern Thailand (Ng & Kottelat, 1998c).

Akysis microps Ng & Tan, 1999

Akysis microps Ng & Tan, 1999: 359 , fig. 5. Type locality: Malaysia: Johor, Sungai Kahang and tributary ca. 44.4 km from Mersing turnoff to Kluang just before side road to Endau Rompin Taman Negara , km 96 from Mersing to Batu Pahat (2º3.93'N, 103º31.58'E). Holotype: ZRC 42596.

Distribution: Endau River basin, southeastern Malay Peninsula (Ng & Tan, 1999).

Akysis pictus Günther, 1883

Akysis pictus Günther, 1883: 138 . Type locality: Tenasserim [ Burma]. Syntypes: BMNH 1880.12.1.25–26 (2); illustrated in Ng (1999e: 542, fig. 1).

Distribution: Southeastern Myanmar, in former Tenasserim district; known only from types (Ng, 1999e).

Remarks: Redescribed in Ng (1999e).

Akysis prashadi Hora, 1936

Akysis variegatus variegatus Prashad & Mukerji, 1929: 180 , pl. 8 (figs. 1–2). Type locality: South end of Indawgyi Lake, along sw. shore, Myitkyina Dist., Upper Burma. Holotype: ZSI F10873/1. Preoccupied in Akysis by Pimelodus variegatus Bleeker, 1846 ; replaced by Akysis prashadi Hora, 1936 .

Akysis prashadi Hora, 1936a: 200 , figs. 1, 2 (b–c). Type locality: South end of Indawgyi Lake , along sw. shore, Myitkyina Dist., Upper Burma. Holotype: ZSI F10873/1.

Distribution: Indawgyi Lake and northern Irrawaddy River basin, Myanmar (Ng, 1999e).

Remarks: Redescribed in Ng (1999e).

Akysis recavus Ng & Kottelat, 1998

Akysis recavus Ng & Kottelat, 1998c: 1090 , fig. 16. Type locality: Thailand: Western Chao Phraya basin. Holotype: ZRC 40716.

Distribution: Western Chao Phraya basin, Thailand (Ng & Kottelat, 1998c).

Akysis variegatus (Beeker, 1846)

Pimelodus variegatus Bleeker, 1846: 177 . Type locality: Batavia. Syntypes: BMNH 1863.12 . 4.187 (1), possibly NMV 46004 (1) , RMNH 6881 (16).

Distribution: Java.

Remarks: Register number of syntype of Akysis variegatus incorrectly reported as BMNH 1863.12. 11.187 in Eschmeyer et al. (1998).

Akysis varius Ng & Kottelat, 1998

Akysis varius Ng & Kottelat, 1998c: 1093 , fig. 18. Type locality: Xe Bangfai , ca 3 km upriver of Pan Pakphanang, Khammouan Prov., Laos. Holotype: ZRC 41015.

Distribution: Mekong River basin, Laos, Cambodia and Thailand (Kottelat, 2001).

Akysis vespa Ng & Kottelat, 2004

Akysis vespa Ng & Kottelat, 2004: 194 , fig. 1. Type locality: Myanmar: Kayin State, stream “ Chon Son ” between Kyondaw and Phadaw, about 20 km NW of Payathouzu (at border with Thailand), 15º25'N, 98º15'E. Holotype: ZRC 46423.

Distribution: Ataran River basin, Myanmar (Ng & Kottelat, 2004).

BREITENSTEINIA Steindachner, 1881

Breitensteinia Steindachner, 1881a: 46 . Type species: Breitensteinia insignis Steindachner, 1881 . Type by monotypy. Gender: Feminine. Also reported as new in Steindachner (1881e: 213).

Revision: Ng & Siebert (1998).

Breitensteinia cessator Ng & Siebert, 1998

Breitensteinia cessator Ng & Siebert, 1998: 647 , fig. 1. Type locality: Borneo : Kapuas mainstream 58 km NE of Sintang and 1 km downstream from Sebruang, (0º25.5'N, 111º52.5'E). Holotype: MZB 3693 .

Distribution: Batang Hari and Tulangbawan basins, Sumatra, and Kapuas River basin, western Borneo (Ng & Siebert, 1998).

Breitensteinia hypselurus Ng & Seibert, 1998

Breitensteinia hypselurus Ng & Seibert, 1998: 650 , figs. 3, 4a. Type locality: Borneo: Sanggau. Holotype: RMNH 16048.

Distribution: Kapuas River basin, western Borneo (Ng & Siebert, 1998).

Breitensteinia insignis Steindachner, 1881

Breitensteinia insignis Steindachner, 1881a: 46 . Type locality: Teweh [= Moara Teweh, Barito River, Borneo]. Holotype: NMW 55042, illustrated in Steindachner (1881f: pl. 1, fig. 2) and described in more detail in Steindachner (1881e: 213).

Distribution: Barito River basin, southern Borneo (Ng & Siebert, 1998).

PARAKYSIS Herre, 1940

Parakysis Herre, 1940: 11 . Type species: Parakysis verrucosa Herre, 1940 . Type by original designation. Gender: Masculine. Name treated by Herre as feminine, but subsequently treated as masculine (Ng & Lim, 1995), presumably following the gender of Akysis .

Revision: Ng & Lim (1995).

Parakysis anomalopteryx Roberts, 1989

Parakysis anomalopteryx Roberts, 1989a: 142 . Type locality: Kapuas basin, Sungai Seriang , a forested tributary of the Sungai Palin, 37 km W of Putussibau, Western Borneo (Kalimantan Barat, Indonesia). Holotype: MZB 3702 .

Distribution: Kapuas River basin, western Borneo (Ng & Lim, 1995).

Parakysis grandis Ng & Lim, 1995 Parakysis grandis Ng & Lim, 1995: 260 , fig. 7. Type locality: Sumatra: Riau Province, small stream with grassy

banks near Pangkalankasai , 43 km. south of Rengat. Holotype: ZRC 39111.

Distribution: Kapuas and Kuching River basins, Borneo; Deli, Indragiri, and Batang Hari basins, Sumatra (Ng & Lim, 1995).

Parakysis longirostris Ng & Lim, 1995

Parakysis longirostris Ng & Lim, 1995: 262 , fig. 8. Type locality: Singapore: Nee Soon swamp forest. Holotype: ZRC 34491.

Distribution: Singapore, peninsular Malaysia and Riau Archipelago (Ng & Lim, 1995; Ng & Tan, 1999).

Parakysis notialis Ng & Kottelat, 2003

Parakysis notialis Ng & Kottelat, 2003: 48 , figs. 1, 2a, 3a. Type locality: Borneo: Kalimantan Selatan, Barito River drainage, area of Tamiyang Layang , 2º01'S, 115º07'E. Holotype: MZB 5994 .

Distribution: Barito River basin, southern Borneo (Ng & Kottelat, 2003).

Parakysis verrucosus Herre, 1940

Parakysis verrucosa Herre, 1940: 12 , pl. 6. Type locality: Mawai District , Johore, Malaysia. Holotype: SU 33009 .

Distribution: Peninsular Malaysia and Riau Archipelago (Ng & Lim, 1995).

PSEUDOBAGARIUS new genus

Type species: Akysis pseudobagarius Roberts, 1989 . Gender: Masculine.

Diagnosis: Akysidae with the following combination of characters: snout extending well anterior of margin of lower jaw, rendering mouth subterminal; narial openings relatively large and closely set; and caudal fin deeply forked.

Remarks: This genus corresponds to the “ pseudobagarius group” of species of the genus Akysis that was first recognized by Ng & Kottelat (1998).

Pseudobagarius alfredi (Ng & Kottelat, 1998)

Akysis alfredi Ng & Kottelat, 1998c: 1063 , fig. 5. Type locality: Malaysia: Pahang, Tasek Bera, approx. 300 m E of Fort Iskandar. Holotype: ZRC 40714.

Distribution: Tasek Bera, southern Malay Peninsula (Ng & Kottelat, 1998c).

Pseudobagarius baramensis (Fowler, 1905)

Akysis baramensis Fowler, 1905: 472 , fig. 4. Type locality: Baram river , Borneo. Holotype: ANSP 114887 .

Distribution: Baram River basin, Borneo (Fowler, 1905).

Pseudobagarius filifer (Ng & Rainboth, 2005)

Akysis filifer Ng & Rainboth, 2005: 37 , fig. 5. Type locality: Cambodia: Kandal, Tonle Sap, fishing lot 8, 22 miles upstream from Phnom Penh , 11º44'N, 104º50'E. Holotype: UMMZ 235728 .

Distribution: Tonlé Sap drainage, Mekong River basin, Cambodia (Ng & Rainboth, 2005: 39).

Pseudobagarius fuscus (Ng & Kottelat, 1996)

Akysis fuscus Ng & Kottelat, 1996: 20 , fig. 1. Type locality: Borneo: Kalimantan Barat, Danau Sentarum area, Sungai Hulu Leboyan at Keluwin. Holotype: MZB 5934 .

Distribution: Kapuas River basin, western Borneo (Ng & Kottelat, 1996).

Pseudobagarius hardmani (Ng & Sabaj, 2005)

Akysis hardmani Ng & Sabaj, 2005: 218 , fig. 3. Type locality: Thailand: Nakhon Sawan, Mae Nam Chao Phraya and tributaries in the vicinity of Phayuka Khiri. Holotype: ANSP 178858 .

Distribution: Chao Phraya River basin, Thailand (Ng & Sabaj, 2005).

Pseudobagarius inermis (Ng & Kottelat, 2000)

Akysis inermis Ng & Kottelat, 2000b: 9 , figs. 1, 2a. Type locality: Laos: Attapeu province: unnamed creek entering Xe Kaman from the north at proposed Xe Kaman dam site, 14º57'40"N, 107º09'16"E. Holotype: ZRC 45401.

Distribution: Xe Banghiang and Xe Kong basins, Mekong River drainage, southern Laos (Ng & Kottelat, 2000b).

Pseudobagarius leucorhynchus (Fowler, 1934)

Akysis leucorhynchus Fowler, 1934a: 97 , figs. 44–45. Type locality: Chieng Mai , North Siam. Holotype: ANSP 59346 .

Distribution: Chao Phraya basin, and rivers of southern peninsular Thailand (Ng & Kottelat, 1998c).

Pseudobagarius macronemus (Bleeker, 1860)

Akysis macronema Bleeker, 1860: 11 . Type locality: Lahat [Sumatra]. Syntypes (4: 36–44 mm TL): BMNH 1863.12 .4.188 (1), RMNH 6729 (2); one syntype illustrated in Bleeker (1862–63: 65, pl. 84 [= Silur. 36], fig. 1).

Distribution: Sumatra (Tan & Ng, 2000).

Remarks: Redescribed in Tan & Ng (2000) from specimens from the Batang Hari basin of central Sumatra. Register number of holotype of Akysis macronema incorrectly reported as BMNH 1863.12. 11.188 in Eschmeyer et al. (1998).

Pseudobagarius meridionalis (Ng & Siebert, 2004)

Akysis meridionalis Ng & Siebert, 2004: 2 , figs. 1, 2a. Type locality: Indonesia, Kalimantan Tengah (Borneo); Barito River drainage, Sungai Laung at Dessa Maruwei (0º21.986'S, 114º44.103'E). Holotype: MZB 6102 .

Distribution: Barito River basin, Borneo (Ng & Siebert, 2004).

Pseudobagarius nitidus (Ng & Rainboth, 2005)

Akysis nitidus Ng & Rainboth, 2005: 40 , fig. 8. Type locality: Laos: Champasak province, Mekong River at Ban Hang Khone, just downstream from Khone falls . Holotype: UMMZ 235400 .

Distribution: Mekong River basin, Laos (Ng & Rainboth, 2005).

Pseudobagarius pseudobagarius (Roberts, 1989)

Akysis pseudobagarius Roberts, 1989a: 138 , fig. 107. Type locality: Bar in mouth of Sungai Melawi at Sintang, Western Borneo (Kalimantan Barat, Indonesia). Holotype: MZB 3691 .

Distribution: Moesi and Kapuas Rivers, Western Borneo (Roberts, 1989a).

Pseudobagarius similis (Ng & Kottelat, 1998)

Akysis similis Ng & Kottelat, 1998c: 1074 , figs. 4e, 9, 13c. Type locality: Vietnam: Kihn Thuy Cai canal, 10 km E of Vinh Long, at mouth of canal into Mekong. Holotype: UMMZ 214902 .

Distribution: Mekong River mouth, southern Vietnam (Ng & Kottelat, 1998c).

Remarks: Coloration of adults and ontogenetic change from juvenile color pattern discussed in Ng & Rainboth (2005: 41).

Pseudobagarius sinensis (He, 1981)

Akysis sinensis He , in He & Chen, 1981: 209, fig. 1. Type locality: Lancang Jiang, Xishuangbanna Daizu Zizhizhou, Yunnan Prov., China. Syntypes: IHASW 638237 (1), IHASW 638283 (1), KIZ 735007 (1), KIZ 735008 (1). Also as Akysis sinesis once in English summary (p. 213); first reviser apparently Eschmeyer et al. (1998).

Distribution: Lancangjiang [= Mekong River], Yunnan, China (Chu et al., 1999).