CHAPTER 9
PARASITES OF COMMERCIALLY IMPORTANT
MARINE MOLLUSCS
THE CLASS CRUSTACEA
I. Class Crustacea
A. Subclass Copepoda
Among the copepod crustaceans, numerous species have been
reported as ( ( parasites ” or as (‘ commensals ” of molluscs including
several from commercially important marine species. These are
reviewed in this section together with a description of each species.
Since most of the earlier descriptions were rather incomplete by modern
standards, there are discrepancies in the descriptions given. For an
account of known copepods parasitic in all categories of molluscs, see
Monod and Dollfus (1932).
1. Mytilicola intestinalis Steuer, 1902. (Fig. 188)
(Order Cyclopoida; family Clausidiidae)
Steuer (1902) described a cyclopoid copepod, Mytilicola intestinalis,
from the intestine of the mussel, Mytilus galloprovincialis, in the Gulf
of Trieste. Later (Steuer, 1903), he published a more detailed account
of this copepod including a description of its internal anatomy. This
was followed by Pesta’s (1907) description of the free-swimming
nauplius, metanauplius, and first copepodid stages, and Caspers’ (1939)
descriptions of the second and third copepodid stages. Cytological
details of the adults have been contributed by Ahrens (1937, 1939a-c).
This parasitic copepod appears to be limited to European waters. It
has been reported from the Adriatic Sea (Steuer, 1902, 1903 ; Pests,
1907 ; Ahrens, 1939a), the Mediterranean (Vayssikre, 1914 ; Dollfus,
1927; Cerruti, 1932; Ahrens, 1939a; Bassedas, 1950; Monod and
Dollfus, 1932) where it is primarily a parasite of M . galloprovincialis
although Vayssiere (1914) has found it in M . edulis. It has been reported
from Germany by Caspers (1939), from the north of France by Dollfus
(1914, 1927) and Monod and Dollfus (1932), from England by Ellenby
(1947), Grainger (1951), Baird et al. (1951) and Cole and Savage (1951),
286
PARASITES OF COMMERCIALLY IMPORTANT
MARINE MOLLUSCS
THE CLASS CRUSTACEA
I. Class Crustacea
A. Subclass Copepoda
Among the copepod crustaceans, numerous species have been
reported as ( ( parasites ” or as (‘ commensals ” of molluscs including
several from commercially important marine species. These are
reviewed in this section together with a description of each species.
Since most of the earlier descriptions were rather incomplete by modern
standards, there are discrepancies in the descriptions given. For an
account of known copepods parasitic in all categories of molluscs, see
Monod and Dollfus (1932).
1. Mytilicola intestinalis Steuer, 1902. (Fig. 188)
(Order Cyclopoida; family Clausidiidae)
Steuer (1902) described a cyclopoid copepod, Mytilicola intestinalis,
from the intestine of the mussel, Mytilus galloprovincialis, in the Gulf
of Trieste. Later (Steuer, 1903), he published a more detailed account
of this copepod including a description of its internal anatomy. This
was followed by Pesta’s (1907) description of the free-swimming
nauplius, metanauplius, and first copepodid stages, and Caspers’ (1939)
descriptions of the second and third copepodid stages. Cytological
details of the adults have been contributed by Ahrens (1937, 1939a-c).
This parasitic copepod appears to be limited to European waters. It
has been reported from the Adriatic Sea (Steuer, 1902, 1903 ; Pests,
1907 ; Ahrens, 1939a), the Mediterranean (Vayssikre, 1914 ; Dollfus,
1927; Cerruti, 1932; Ahrens, 1939a; Bassedas, 1950; Monod and
Dollfus, 1932) where it is primarily a parasite of M . galloprovincialis
although Vayssiere (1914) has found it in M . edulis. It has been reported
from Germany by Caspers (1939), from the north of France by Dollfus
(1914, 1927) and Monod and Dollfus (1932), from England by Ellenby
(1947), Grainger (1951), Baird et al. (1951) and Cole and Savage (1951),
286