Calanoida ( Order )
Metridinidae Sars, 1902 ( Arietelloidea )
Syn.: Metridiidae Sars, 1902 (1903) (p.110); Sewell, 1932 (p.247); Gurney, 1931 a (p.84); Rose,1933 a (p.175); Sewell, 1947 (p.165), Rem.; Brodsky, 1950 (1967) (p.81, 289); Mazza, 1967 (p.185); Andronov, 1974 a (p.1005); Brodsky & al., 1983 (p.141, 145); Zheng Zhong & al., 1984 (1989) (p.242)
Ref.: Dunn & Hulsemann, 1979 (p.53: emend.); Razouls, 1982 (p.405); 1993 (p.307); Bowman & Abele, 1982 (p.9); Bull. Zool. Nomencl, 1984 ( N°41,1, p.19); Sazhina, 1985 (p.114, Nauplius); Mauchline, 1988 (p.711: cuticular pores); Huys & Boxshall, 1991 (p.464); Chihara & Murano, 1997 (p.837); Cuoc & al., 1997 (p.651, Fig.6: female genital area); Bradford-Grieve & al., 1999 (p.883, 901, 903, 947, Genera Key); Bradford-Grieve, 1999 b (p.110, Déf., Rem.); Soh & al., 1999 (p.122, phylogeny); Ohtsuka & Huys, 2001 (p.461); Boxshall & Halsey, 2004 (p.13; 49; 145: Def.; p.146: Genera Key); Vives & Shmeleva, 2007 (p.356, clé des Genera Key); Blanco-Bercial & al., 2011 (p.103, Table 1, Fig.2, 3, 4, Biol. mol, phylogeny)
Bradford-Grieve J.M., (2002 onwards). Key to calanoid copepod families. Version 1 : 2 oct 2002. http://www.crustacea.net/crustace/calanoida/index.htm
Rem.: 3 G.: Gaussia, Metridia, Pleuromamma.
For numerous authors, after mouthpart morphology and gut contents, and dietary preferences of laboratory reared specimens, this family appears to be omnivorous.
Family Metridinidae - Plate 1issued from :C. Cuoc, D. Defaye, M. Brunet, R. Notonier & J. Mazza in Mar. Biol., 1997, 129. [p.13, Fig.6].
Diagrammatic representation of main evolutionary trends in organization of female genital area in calanoïds for Metridinidae (modified after Huys & Boxshall, 1991 and Ohtsuka & al., 1994).
*: seminal duct of Pleuromamma may be situated on left or right, according to individual.

Family Metridinidae - Plate 2issued from :C. Cuoc, D. Defaye, M. Brunet, R. Notonier & J. Mazza in Mar. Biol., 1997, 129. [p.661, Fig.5].
Metridinidae. Schematic three-dimensional interpretation of structure and function of egg-laying ducts.
A1, A2 Dorsal representations of egg-laying duct when closed (A1) and open (A2).
B1, B2 details of part duct when closed (B1) and open (B2), showing how contraction and relaxation of muscles of egg-laying duct resulut in coordinated opening and closing of the gonopores and seminal ducts (black arrows), allowing release of gametes (open arrows) (the shell ducts, which open into the egg-laying ducts, are not shown on diagram).
(1) Gaussia Wolfenden, 1905
Ref.: Wolfenden, 1905 a (p.5); 1911 (p.289); Sewell, 1932 (p.176); Davis, 1949 (p.50); Brodsky, 1950 (1967) (p.312); Tanaka, 1963 (p.26); Barnes & Case, 1972 (p.66: Rem.); Saraswathy, 1973 (p.190, Redef.); Razouls, 1982 (p.418); Gardner & Szabo, 1982 (p.347); Mauchline, 1988 (p.709); Björnberg & Campaner, 1988 (p.351); Hulsemann, 1988 (p.188); Razouls, 1993 (p.307); Mauchline, 1998 (p.67); Bradford-Grieve & al., 1999 (p.948: clé spp.); Bradford-Grieve, 1999 b (p.110, Déf., Rem.); Soh & al., 1999 (p.122, phylogeny); Boxshall & Halsey, 2004 (p.146); Vives & Shmeleva, 2007 (p.357)
Rem.: Type: Pleuromma princeps T. Scott, 1894. 4 spp.:
Remarks on dimensions and sex ratio:
The mean female size is 10,09 mm (n= 4; S= 0,477; Cv= 0,047) and the mean male size is 9,60 mm (n= 3; S= 0,854; Cv= 0,089). The size ratio (M/F) is 0,948 or 94,8 % (n= 3; S= 0,046; Cv= 0,049)
(2) Metridia Boeck, 1864
Ref.: Giesbrecht, 1892 (p.61, 339); Giesbrecht & Schmeil, 1898 (p.105, clé spp.); Sars, 1900 (p.99); Wheeler, 1901 (p.175); Sars, 1902 (1903) (p.110); Esterly, 1905 (p.177); van Breemen, 1908 a (p.107, clé spp.); A. Scott, 1909 (p.120); Esterly, 1924 (p.96); Wilson, 1932 a (p.117, clé spp.); Sewell, 1932 (p.247); Rose, 1933 a (p.175, clé spp.); Mori, 1937 (1964) (p.67); Sewell, 1947 (p.165, 166); Farran, 1948 c (n°14, p.3); Davis, 1949 (p.47); Brodsky, 1950 (1967) (p.289, clé spp.); Tanaka, 1963 (p.15); Björnberg, 1972 (p.30, 31); Björnberg & al., 1981 (p.640); Razouls, 1982 (p.405); Gardner & Szabo, 1982 (p.321); Mauchline, 1988 (p.708); Razouls, 1993 (p.307); Bucklin & al., 1995 (p.655); Chihara & Murano, 1997 (p.837); Mauchline, 1998 (p.67); Bradford-Grieve & al., 1999 (p.948, clé spp.); Bradford-Grieve, 1999 b (p.112, Déf.); Soh & al., 1999 (p.122, phylogeny); Boxshall & Halsey, 2004 (p.146); Vives & Shmeleva, 2007 (p.359, spp. key)
Rem.: Type: Metridia armata Boeck, 1865 (= Metridia longa (Lubbock, 1854). 25 spp. (of which 3 doubtful) + 2 unidentified. :
Remarks on dimensions and sex ratio:
The mean female size is 4,858 mm (n= 23; S= 2,580; Cv= 0,53) and the mean male size is 4,050 mm n= 22; S= 2,61; Cv= 0,64). The coefficients of variance indicate a strong heterogeneity of the sizes (7 species have sizes > 7 mm and 6 species 3 mm or less) The size ratio (M/F) is 0,848 ou 84,8 % (n= 20; S= 0,101; Cv= 0,119). The sex-ratio (F/M) is 1,05.
(3) Pleuromamma Giesbrecht, 1898
Syn.: Diaptomus (part.) Lubbock,1856; Pleuromma Claus,1863 (p.195); Giesbrecht, 1892 (p.61, 347); Dahl, 1893 (p.105, clé spp.); Wheeler, 1901 (p.76)
Ref.: in Giesbrecht & Schmeil, 1898 (p.108, spp. Key); Sars,1902 (1903) (p.114); Esterly, 1905 (p.174); van Breemen, 1908 a (p.103, clé spp.); A. Scott, 1909 (p.122); Sewell, 1932 (p.263); Wilson, 1932 a (p.123, spp. Key); Steuer, 1932 a (p.42, 62, 83, spp. Key); Rose, 1933 a (p.179, spp. Key); Mori, 1937 (1964) (p.68, spp. Key); Dakin & Colefax, 1940 (p.84, spp. Key); Farran, 1948 f (n°17, p.3); Davis, 1949 (p.51); Brodsky, 1950 (1967) (p.305, key spp.); Tanaka, 1963 (p.22); Owre & Foyo, 1967 (p.70, clé spp.); Björnberg, 1972 (p.30,31); Björnberg & al., 1981 (p.640); Razouls, 1982 (p.412); Gardner & Szabo, 1982 (p.333); Ferrari, 1984 a (p.166: asymmetry); Mauchline, 1988 (p.709); Huys & Boxshall,1991 (p.63, 68); Razouls, 1993 (p.307); Park (J.S) & Mauchline, 1994 (p.107, Rem.: cuticular pores); Beckmann, 1995 (in Monoculus, n°29, p.6: asymmetry); Chihara & Murano, 1997 (p.838); Mauchline, 1998 (p.67); Bradford-Grieve & al., 1999 (p.947, 948: clé spp.); Bradford-Grieve, 1999 b (p.118, Déf.); Soh & al., 1999 (p.122, phylogeny); Boxshall & Halsey, 2004 (p.146); Mulyadi, 2004 (p.10, spp. Key for Indonesian Seas); Vives & Shmeleva, 2007 (p.372, spp. Key)
Rem.: Type: Diaptomus abdominalis Lubbock,1856. 11 spp. + 1 (juv?):
Remarks on dimensions and sex ratio:
The mean female size is 3,236 mm (n= 11; S= 0,981; Cv= 0,303) and the mean male size is 2,928 mm (n= 11; S= 1,022; Cv= 0,349). The size ratio (M/F) is 0,902 ou 90,2 % (n= 11; S= 0,090; Cv= 0,100). The sex-ratio (F/M) is 1.

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