9. THE CLASS CRUSTACEA
307
border of division and another group of small spines tranversely
arranged in posterior half of segment; abdomen of four segments
measuring 0.030, 0.034, 0.036 and 0.016 mm respectively ; posterior
borders of first and second abdominal segments each with a group of
small spines; dorsal surface of genital segment without spines; two
spermatophores present ; first antenna with seven segments measuring
(from base to tip) 0.033, 0.042, 0.015, 0.022, 0-041, 0.026 and 0.030 mm
long respectively ; two large sensory organs on fourth segment and one
little one on each of three basal segments ; second antenna as in female ;
first through fourth legs liks those of female but medial seta of coxoFIGS. 203-206. Ost?%COh and Myicola. (203) Adult female 0. simplex, dorsal view;
(204) adult male 0. simplex, dorsal view (redrawn after Humes, 1968b); (206)
adult female M . rnetisiensis, dorsal view; (206) adult male M . metisienais. dorsal
view (redrawn after Wright, 1886).
podite of fourth leg much longer than that of female ; distal podomere
of fifth leg much finer than that of female measuring 0.042 mm x
0.012 mm, seta on its external border 0.025 mm long while the terminal
setae measure 0.019, 0.016 and 0.032 mm long respectively; sixth leg
includes two setae, 0.015 and 0.013 mm long; caudal rami like those
of female.
Other information. Humes (1958b) has noted that these copepods
will live in a glass container in the laboratory and will swim capriciously
when disturbed.
307
border of division and another group of small spines tranversely
arranged in posterior half of segment; abdomen of four segments
measuring 0.030, 0.034, 0.036 and 0.016 mm respectively ; posterior
borders of first and second abdominal segments each with a group of
small spines; dorsal surface of genital segment without spines; two
spermatophores present ; first antenna with seven segments measuring
(from base to tip) 0.033, 0.042, 0.015, 0.022, 0-041, 0.026 and 0.030 mm
long respectively ; two large sensory organs on fourth segment and one
little one on each of three basal segments ; second antenna as in female ;
first through fourth legs liks those of female but medial seta of coxoFIGS. 203-206. Ost?%COh and Myicola. (203) Adult female 0. simplex, dorsal view;
(204) adult male 0. simplex, dorsal view (redrawn after Humes, 1968b); (206)
adult female M . rnetisiensis, dorsal view; (206) adult male M . metisienais. dorsal
view (redrawn after Wright, 1886).
podite of fourth leg much longer than that of female ; distal podomere
of fifth leg much finer than that of female measuring 0.042 mm x
0.012 mm, seta on its external border 0.025 mm long while the terminal
setae measure 0.019, 0.016 and 0.032 mm long respectively; sixth leg
includes two setae, 0.015 and 0.013 mm long; caudal rami like those
of female.
Other information. Humes (1958b) has noted that these copepods
will live in a glass container in the laboratory and will swim capriciously
when disturbed.