Key for Anthalona species of South-East Asia

1a. IDL seta 3 with long distal portion, armed with thin setules of equal thickness.................................................................................................. Anthalona sanoamuangae Sinev & Kotov, 2012 .

1b. IDL seta 3 with thick spine at the middle and shortened distal portion armed with thin setulae, or IDL seta 3 armed with several long spines.......................................................................................... 2

2a. IDL seta 3 with thick spine at the middle and shortened distal portion armed with thin setulae......................... 3

2b. IDL seta 3 armed with several long spines.................................................................. 5

3a. Cosmaria of lateral pores flower-like............................................. Anthalona milleri (Kiser, 1948)

3b. Cosmaria of lateral pores bilobed......................................................................... 4

4a. IDL setae 2-3 thick, curved, claw-like; distal portion of seta 3 shorter than its basal spine. Anterior margin of labral keel with a blunt denticle bearing a spinule.......................... Anthalona harti harti Van Damme, Sinev & Dumont, 2011 .

4b. IDL setae 2-3 moderately thick, weakly curved; distal portion of seta 3 longer than its basal spine. Anterior margin of labral keel with a blunt denticle lacking a spinule........................ Anthalona obtusa Van Damme, Sinev & Dumont, 2011 .

5a. Posterior setae of valves short, posteriormost setae located before posteroventral angle of valves. IDL setae 2-3 armed with spines of similar thickness and length................... Anthalona spinifera Tiang-nga, Sinev & Sanoamuang, 2016.

5b. Posterior setae of valves long, posteriormost setae located at posteroventral angle of valves. IDL setae 2-3 with basal spine much thicker and longer than others............................................. Anthalona vandammei sp. nov.