Echinococcus multilocularis (continued)
OVA
SIZE: 30 to 40 mcm.
SHAPE: Ovoid to round.
COLOR: Brown.
OPERCULUM: Absent.
CONTENTS: Hexacanth oncosphere.
MISCELLANEOUS: Embryophore with double layer and a striated outer layer;
indistinguishable from taenioid ova.
ADULT
SIZE: 1.2 to 3.7 mm by 0.3 mm.
COLOR: Ivory.
SCOLEX
SIZE: 0.1 mm.
SHAPE: Pyriform.
ROSTELLUM: Armed with 30 to 36 hooklets.
PROGLOTTID
USUALLY THREE: immature, mature, and gravid.
SIZE: 0.1 mm by 0.4 mm.
SHAPE: Longer than broad.
GENITAL PORE: Lateral; preequatorial.
UTERUS: Longitudinal sac.
OVARIES: Two, oval.
TESTES: Minute, spherical (15 to 30).
Figure 3-55. Stages of Echinococcus multilocularis. (continued)
MD0842
3-64