S. calcitrans was the only species found
at all collection sites throughout the country.
Collectively, (with the exception of the southern
reaches), S. calcitrans samples were captured
approximately in the same proportion from each
region of the country, with the greatest proportion
recorded from the western provinces of
Kanchanaburi and Prachuap Khiri Khan (30.3%),
followed by 22.9% from northern Thailand, 20.1%
northeast-central and 22.5% from the east of the
country. The smallest proportion was observed
from Surat Thani and Songkhla (southern
province) at 4.1%