6. THE PHYLA PORIFERA, CNIDARIA AND PLATYHELMINTHES
221
Lebour’s specimens represent metacercariae in the second intermediate
host.
Description. Metacercaria (Fig. 130) elongate, more pointed posteriorly, averaging 0.4 mm long x 0-24 mm wide ; covered with cuticular
spines ; anterior sucker 0.09 mm in transverse diameter ; ventral sucker,
0.3 mm in transverse diameter, in posterior half of body ; prepharynx
absent ; pharynx 0-03 mm long ; esophagus extremely short or nonexistent ; intestinal caeca reaching slightly beyond level of ventral
sucker ; excretory vesicle Y-shaped with short stem, vesicular arms
reaching level of pharynx.
It is most probably a
parasite of some shore bird.
12. Metacercaria (Gymnophallus) macomae Lebour, 1908. (Fig. 131)
Other information. Nothing else is known.
(Superorder Anepitheliocystidia; order Strigeatoidea; suborder Azygiata;
This parasite, found between the mantle and shell of Tellina
solidula (=Macoma balthica) was described by Lebour (1908) as a
cercaria, C . macomae. The hosts were collected at Fenham Flats,
England.
Description. Metacercaria (Fig. 131) 0.70 mm long; covered with
cuticular spines ; anterior sucker 0.22-0.26 mm in diameter ; ventral
sucker, 0.06-0.07 mm in diameter, in posterior half of body; prepharynx absent ; small pharynx and short esophagus present ; intestinal
caeca reaching between levels of anterior margin and midlength of
ventral sucker ; excretory vesicle said to be horseshoe-shaped, actually
Y-shaped with extremely short stem ; two testes, each slightly larger
than ovary, situated posterior to ventral sucker, each overlapping one
arm of excretory vesicle; ovary in front of right testis; vitellaria as
two masses posterolateral and partially overlapping ventral sucker.
Other information. No other information is available on this species.
Again, Macoma balthica is undoubtedly the second intermediate host
and the definitive host is most probably some shore bird.
13. Metacercaria (Gymnophallus) perligena Palombi, 1940. (Fig. 132)
(Superorder Anepitheliocystidia; order Strigeatoidea; suborder Azygiata;
superfamily Fellodistomatoidea; family Fellodistomatidae)
This metacercaria was described by Palombi (1940) from specimens
provided by A. Cerruti from the mantle of Mytilus galloprovincialis
collected in the Gulf of Taranto, Italy. The mantle of parasitized
mussels is commonly covered, with encysted metacercariae (Fig. 132).
superfamily Fellodistomatoidea; family Fellodistomatidae)
221
Lebour’s specimens represent metacercariae in the second intermediate
host.
Description. Metacercaria (Fig. 130) elongate, more pointed posteriorly, averaging 0.4 mm long x 0-24 mm wide ; covered with cuticular
spines ; anterior sucker 0.09 mm in transverse diameter ; ventral sucker,
0.3 mm in transverse diameter, in posterior half of body ; prepharynx
absent ; pharynx 0-03 mm long ; esophagus extremely short or nonexistent ; intestinal caeca reaching slightly beyond level of ventral
sucker ; excretory vesicle Y-shaped with short stem, vesicular arms
reaching level of pharynx.
It is most probably a
parasite of some shore bird.
12. Metacercaria (Gymnophallus) macomae Lebour, 1908. (Fig. 131)
Other information. Nothing else is known.
(Superorder Anepitheliocystidia; order Strigeatoidea; suborder Azygiata;
This parasite, found between the mantle and shell of Tellina
solidula (=Macoma balthica) was described by Lebour (1908) as a
cercaria, C . macomae. The hosts were collected at Fenham Flats,
England.
Description. Metacercaria (Fig. 131) 0.70 mm long; covered with
cuticular spines ; anterior sucker 0.22-0.26 mm in diameter ; ventral
sucker, 0.06-0.07 mm in diameter, in posterior half of body; prepharynx absent ; small pharynx and short esophagus present ; intestinal
caeca reaching between levels of anterior margin and midlength of
ventral sucker ; excretory vesicle said to be horseshoe-shaped, actually
Y-shaped with extremely short stem ; two testes, each slightly larger
than ovary, situated posterior to ventral sucker, each overlapping one
arm of excretory vesicle; ovary in front of right testis; vitellaria as
two masses posterolateral and partially overlapping ventral sucker.
Other information. No other information is available on this species.
Again, Macoma balthica is undoubtedly the second intermediate host
and the definitive host is most probably some shore bird.
13. Metacercaria (Gymnophallus) perligena Palombi, 1940. (Fig. 132)
(Superorder Anepitheliocystidia; order Strigeatoidea; suborder Azygiata;
superfamily Fellodistomatoidea; family Fellodistomatidae)
This metacercaria was described by Palombi (1940) from specimens
provided by A. Cerruti from the mantle of Mytilus galloprovincialis
collected in the Gulf of Taranto, Italy. The mantle of parasitized
mussels is commonly covered, with encysted metacercariae (Fig. 132).
superfamily Fellodistomatoidea; family Fellodistomatidae)