9. T H E CLASS CRUSTACEA
303
fifth leg with two podomeres, basal one small, with single outer seta,
distal one expanded as broad inwardly concave disk with four marginal
setae ; egg sacs attached dorsoventrally, each containing about seven
eggsAdult male (Fig. 200) resembles females in color; total length
averaged 0-760 mm, greatest width 0.200 mm ; abdomen of four segments ; ventral surfaces of genital segment and abdomen bear minute
spines ; caudal rami similar to those of female ; first antenna of seven
segments, with all but basal one having an aesthete ; second antenna
FIQS. 199-202. Ostrincola spp. (199) Adult female 0. gracilis, dorsal view; (200) adult
male 0. gracilis, dorsal view (redrawn after Humes, 1953); (201) adult female 0.
clawator, dorsal view; (202) adult male 0. clavator, dorsal view (redrawn after
Humes, 1958b).
like that of female ; four pairs of swimming legs identical with those of
female ; fifth leg with two podomeres, basal one with single outer seta,
second podomere longer, not expanded, with more or less parallel
margins, and with four marginal setae ; sixth leg consists of two setae
a t posterior corner of genital segment.
Humes (1953) has reported that from one to
eleven copepods are found in each of the 157 parasitized Crassostrea
virginica, one to seven in each of the eighty-nine parasitized Modiolus
Other information.
303
fifth leg with two podomeres, basal one small, with single outer seta,
distal one expanded as broad inwardly concave disk with four marginal
setae ; egg sacs attached dorsoventrally, each containing about seven
eggsAdult male (Fig. 200) resembles females in color; total length
averaged 0-760 mm, greatest width 0.200 mm ; abdomen of four segments ; ventral surfaces of genital segment and abdomen bear minute
spines ; caudal rami similar to those of female ; first antenna of seven
segments, with all but basal one having an aesthete ; second antenna
FIQS. 199-202. Ostrincola spp. (199) Adult female 0. gracilis, dorsal view; (200) adult
male 0. gracilis, dorsal view (redrawn after Humes, 1953); (201) adult female 0.
clawator, dorsal view; (202) adult male 0. clavator, dorsal view (redrawn after
Humes, 1958b).
like that of female ; four pairs of swimming legs identical with those of
female ; fifth leg with two podomeres, basal one with single outer seta,
second podomere longer, not expanded, with more or less parallel
margins, and with four marginal setae ; sixth leg consists of two setae
a t posterior corner of genital segment.
Humes (1953) has reported that from one to
eleven copepods are found in each of the 157 parasitized Crassostrea
virginica, one to seven in each of the eighty-nine parasitized Modiolus
Other information.