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Family OCTOCHAETIDAE
DICHOGASTER Beddard, 1888
DIAGNOSIS.
Setae lumbricine. Dorsal
pores present. Clitellum includes segments 14-18. Prostates tubular
discharging
on segments 17 and 19 or 17 only. Male pores on segment 18. Penial
setae
present. Two well developed oesophageal gizzards anterior to septum
8/9. Paired
calciferous glands in segments 15, 16 and 17, intestinal caeca and
gizzards
absent. Excretory system meronephric.
INDIGENOUS
RANGE. Tropical Americas,
Africa.
Several species are allochthonous of which two have been recorded from Japan.
Key to
species recorded from Japan
１ One
pair
of prostates which discharge
onto segment 17 ............. . . . saliens
Two
pairs of prostates which discharge onto segments 17 and 19 . . bolaui
Dichogaster bolaui Michaelsen,
189l
bolaui
Michaelsen, 1891a : 9. Japanese
records: Kobayashi, 1941c : 379.
DIAGNOSIS. Length 20-40 mm. Two pairs of
prostates discharging on segments 1 7 and 1 9.
JAPANESE
RECORDS. Okinawa-Gunto OKINAWA-JIMA
(Kobayashi, 1941c).
DISTRIBUTION.
Cosmopolitan (indigenous
range unknown).
Dichogaster
saliens
(Beddard, 1893)
saliens
Beddard, 1893 : 683.
hatomaana
Ohfuchi, 1957 : 259.
DIAGNOSIS.
Length 17-70 mm. One pair of
prostates discharging onto segment 1 7 only. REMARKS. The description
of
D.hatomaana provided by Ohfuchi (1957) is indistinguishable from that
of
saliens.
JAPANESE
RECORDS. Sakishima-Gunto
IRIOMOTE-JIMA Hatoma-jima (Ohfuchi, 1957).
DISTRIBUTION.
Cosmopolitan (indigenous
range unknown).
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