RESULTS
Nine families and 32 species of brackish-water
snails were recovered from Surat Thani Province. The
number of snails collected by each station is given for
each species in Table 2. Also shown in this table is the
number of species (S), number of individuals (N), and
most abundant species (Nmax) of each identified
brackish-water snail in the station. Moreover, some
descriptions of snail habitats are described in detail
(Table 1). Table 3 demonstrates the relative abundance
of each brackish-water snail species as percent
composition, based upon the total number of snails
collected (9,718). In addition, the total number of
stations is given for each species and is referred to as
total frequency.
Of Cerithidea species examined, three species,
Cerithidea (Cerithideopsilla) cingulata, C. (C.)
djadjariensis, and C. (Ceritidea) charbonnieri, were
naturally infected with trematode cercariae (Table 4)
were found from them although another one type was
undetermined. The first type of cercariae had the
cystogenous gland cells but neither eyespot nor collar
spines. The second type had two eyespots, 4 and 3
penetration gland cells forming two rows, and a tail
with a fin. The number of snails infected with each
type of trematode varied markedly among species and
localities (Table 4).