Kalataw atawa kelataw adalah ngaran iwak halus genus Betta nang macam-macam belangnya, sifatnya agrésif dalam mampartahanakan wilayahnya. Marga dari itu, iwak ini rancak dijadi'akan iwak aduan. Iwak ini nahap batahan hidup dalam waktu lawas. Biar inya diandak dalam volume banyu nang sahikit wan kada pakay alat sirkulasi udara (aerator) gén inya kawa tatap batahan hidup. Ini marga iwak ini tamasuk golongan anabantoida, nang artinya inya kawa mahinak udara atmosfér mamakay organ unik bangaran labyrinth.

Spésiés

Akarensis complex:
Betta akarensis Regan, 1910 – Akar betta
Betta antoni Tan & Ng, 2006
Betta aurigans Tan & Ng, 2004
Betta balunga Herre, 1940
Betta chini Ng, 1993
Betta ibanorum Tan and Ng, 2004
Betta obscura Tan & Ng, 2005
Betta pinguis Tan and Kottelat, 1998

Albimarginata complex:
Betta albimarginata Kottelat and Ng, 1994
Betta channoides Kottelat and Ng, 1994

Anabatoides complex:
Betta anabatoides Bleeker, 1851 – giant betta

Bellica complex:
Betta bellica Sauvage, 1884 – slim betta
Betta simorum Tan and Ng, 1996

Coccina complex:
Betta brownorum Witte and Schmidt, 1992
Betta burdigala Kottelat and Ng, 1994
Betta coccina Vierke, 1979
Betta livida Ng and Kottelat, 1992
Betta miniopinna Tan and Tan, 1994
Betta persephone Schaller, 1986
Betta rutilans Witte and Kottelat in Kottelat, 1991
Betta tussyae Schaller, 1985
Betta uberis Tan & Ng, 2006

Dimidiata complex:
Betta dimidiata Roberts, 1989
Betta krataios Tan & Ng, 2006

Edithae complex:
Betta edithae Vierke, 1984

Foerschi complex:
Betta foerschi Vierke, 1979
Betta mandor Tan & Ng, 2006
Betta rubra Perugia, 1893 – Toba betta
Betta strohi Schaller and Kottelat, 1989

Picta complex:
Betta falx Tan and Kottelat, 1998
Betta picta (Valenciennes, 1846) – spotted betta
Betta simplex Kottelat, 1994
Betta taeniata Regan, 1910 – Borneo betta

Pugnax complex:
Betta breviobesus Tan and Kottelat, 1998
Betta cracens Tan & Ng, 2005
Betta enisae Kottelat, 1995
Betta fusca Regan, 1910 – dusky betta
Betta lehi Tan & Ng, 2005
Betta pallida Schindler & Schmidt, 2004
Betta prima Kottelat, 1994
Betta pugnax (Cantor, 1849) – Penang betta
Betta pulchra Tan and Tan, 1996
Betta raja Tan & Ng, 2005
Betta schalleri Kottelat and Ng, 1994
Betta stigmosa Tan & Ng, 2005

Splendens complex:
Betta imbellis Ladiges, 1975 – crescent betta
Betta mahachai Panitvong, Nonn, 2002 –
Betta smaragdina Ladiges, 1972 – emerald green betta
Betta splendens Regan, 1910 – Siamese fighting fish
Betta stiktos Tan & Ng, 2005

Unimaculata complex:
Betta compuncta Tan & Ng, 2006
Betta gladiator Tan & Ng, 2005
Betta ideii Tan & Ng, 2006
Betta macrostoma Regan, 1910 – spotfin betta
Betta ocellata de Beaufort, 1933
Betta pallifina Tan & Ng, 2005
Betta patoti Weber and de Beaufort, 1922
Betta unimaculata (Popta, 1905) – Howong betta

Waseri complex:
Betta chloropharynx Kottelat and Ng, 1994
Betta hipposideros Ng and Kottelat, 1994
Betta pardalotos Hui, 2009
Betta pi Tan, 1998
Betta renata Tan, 1998
Betta spilotogena Ng and Kottelat, 1994
Betta tomi Ng and Kottelat, 1994
Betta waseri Krummenacher, 1986

unassigned:
Betta apollon Schindler & Schmidt, 2006
Betta bangka
Betta bungbihn
Betta ferox Schindler & Schmidt, 2006
Betta sukadan
Kalataw