List species and varieties by family
Metridinidae Sars, 1902 ( Arietelloidea )
(1) Gaussia Wolfenden, 1905
Rem.: Type: Pleuromma princeps T. Scott, 1894. 4 spp.:

[1] Gaussia asymmetrica  Björnberg & Campaner, 1988   (F)    [Figs]

[2] Gaussia intermedia  Defaye, 1998   (F,M)    [Figs]

Gaussia melanotica    Wolfenden, 1905   (F,M)

[3] Gaussia princeps  (T. Scott, 1894)   (F,M)    [Figs]

Gaussia scotti    Giesbrecht, 1897   (F,M)
Syn.: Metridia scotti Giesbrecht, 1897 b (p.254, Rem.M); Giesbrecht & Schmeil, 1898 (p.107, Rem.M)
Ref.: Wolfenden, 1905 a (p.5, figs.F,M); Vervoort, 1965 (p.103); Saraswathy, 1973 a (p.91, figs.F,M); Hulsemann, 1988 (p.188, Rem.)
Rem.: Cf. Gaussia princeps

[4] Gaussia sewelli  Saraswathy, 1973   (F,M)    [Figs]
(2) Metridia Boeck, 1864
Rem.: Type: Metridia armata Boeck, 1865 (= Metridia longa (Lubbock, 1854). 25 spp. (of which 3 doubtful) + 2 unidentified. :

[1] Metridia alata  Roe, 1975   (F,M)    [Figs]

[2] Metridia andraeana  Brady, 1918   (F,M)
Rem.: Doubtful species.
Sampling depth (sub-Antarct.) : 0-200 m.

Metridia armata    Boeck, 1864   (F,M)
Ref.: Brady, 1878 (p.42, figs.F,M); Giesbrecht & Schmeil, 1898 (p.106)
Loc: Irlande
Rem.: Cf. Metridia longa

[3] Metridia asymmetrica  Brodsky, 1950   (F,M)    [Figs]

Metridia atra    Esterly, 1906   (F,M)
Ref.: Esterly, 1906 a (p.70, figs.F,M); Vervoort, 1965 (p.104, Rem.)
Loc: Pacif. E (San Diego), Philippines, Nouvelle-Calédonie N
Rem.: Cf. Gaussia princeps

[4] Metridia bicornuta  Davis, 1949   (F)    [Figs]

[5] Metridia boecki  Giesbrecht, 1889   (F, ?M)    [Figs]

[6] Metridia brevicauda  Giesbrecht, 1889   (F,M)    [Figs]

[7] Metridia calypsoi  Gaudy, 1963   (M)    [Figs]

[8] Metridia curticauda  Giesbrecht, 1889   (F,M)    [Figs]

[9] Metridia discreta  Farran, 1946   (F,M)    [Figs]

[10] Metridia effusa  Grice & Hulsemann, 1967   (F,M)    [Figs]

[11] Metridia ferrarii  Markhaseva, 2001   (F,M)    [Figs]

[12] Metridia gerlachei  Giesbrecht, 1902   (F,M)    [Figs]

[13] Metridia gurjanovae  Brodsky, 1950   (F,M)    [Figs]

Metridia hibernica    Brady & Robertson, 1873   (F,M)
Syn.: Paracalanus hibernicus Brady & Robertson,1873
Ref.: Giesbrecht, 1892 (p.339); Wheeler, 1901 (p.176, figs.F,M, Rem.)
Loc: Woods Hole
Rem.: Cf. Metridia lucens

[14] Metridia ignota  Esterly, 1906   (F)    [Figs]

[15] Metridia longa  (Lubbock, 1854)   (F,M)    [Figs]

Metridia longa spinulosa    Linko, 1913   
Ref.: Brodsky, 1950 (1967) (p.293, figs.F)
Loc: Arct., Cap Chelyuskin
N: 2

[16] Metridia lucens  Boeck, 1864   (F,M)    [Figs]

Metridia lucens pacifica    Brodsky, 1948   
Ref.: Brodsky, 1950 (1967) (p.295)
Rem.: Cf. Metridia pacifica

[17] Metridia macrura  Sars, 1905   (F,M)    [Figs]

Metridia normani    Giesbrecht, 1892   (F,M)
Ref.: Giesbrecht, 1892 (p.340, Descr.M, figs.M); Giesbrecht & Schmeil, 1898 (p.107); Wolfenden, 1904 (p.136, figs.F); 1911 (p.287); Vervoort, 1957 (p.121)
Loc: Féroé, Is. Cap Vert
Rem.: La femelle est probablement juvénile. Cf. Metridia venusta

[18] Metridia okhotensis  Brodsky, 1950   (F,M)    [Figs]

[19] Metridia ornata  Brodsky, 1950   (F,M)    [Figs]

[20] Metridia pacifica  Brodsky, 1950   (F,M)    [Figs]

[21] Metridia princeps  Giesbrecht, 1889   (F,M)    [Figs]

Metridia scotti    Giesbrecht, 1897   (M)
Syn.: Pleuromma princeps T. Scott, 1894 b (p.42); non M. scotti : Sewell, 1913 (p.354)
Ref.: Giesbrecht, 1897 b (p.254); Hulsemann, 1988 (p.188, Rem.)
Loc: G. de Guinée
Rem.: Cf. Gaussia princeps

[22] Metridia pseudoasymmetrica  Markhaseva, 2001   (F,M)    [Figs]

[23] Metridia similis  Brodsky, 1950   (F,M)    [Figs]

[24] Metridia trispinosa  Brady, 1918   (M)

[25] Metridia venusta  Giesbrecht, 1889   (F,M)    [Figs]

[26] Metridia sp.  Esterly, 1906   (F,M)    [Figs]

Metridia sp.    Esterly, 1924   (F,M)
Ref.: Esterly, 1924 (p.96, figs.F,M)
Loc: San Francisco
Lg.: (145) F: 2,6; M: 2,1
Rem.: Cf. Metridia pacifica ou lucens , ou boecki

[27] Metridia sp.  Candeias, 1926   (M)

[28] Metridia sp.  Chihara & Murano, 1997   (F)
(3) Pleuromamma Giesbrecht, 1898
Rem.: Type: Diaptomus abdominalis Lubbock,1856. 11 spp. + 1 (juv?):

[1] Pleuromamma abdominalis  (Lubbock, 1856)   (F,M)    [Figs]
Rem.: epi-meso-bathypelagic. Considered as vetical migrator. Overall Depth Range in Sargasso Sea: 0-2000 m (Deevey & Brooks, 1977, Station "S"); ? Harding, 1974, off E Cape Cod (2000-1000 m).
For Fornshell & Ferrari (2010, p.763) the widespread distribution of morphs attribuable to forms typica and forma edentata, their co-occurrences, and the presence of specmens exhibiting morphologies incrementally graduated between the two forms, suggest that these two morphological forms of P. abdominalis are examples of a continuous variability within this species. Thus the authors do not believe that forma edentata should be treated as a subspecies of P. abdominalis. However it is important to continue to register the morphological variation among males of P. abdominalis. In situations where groups of females or males can be clearly categorized, they should be denoted simply as morphs.
After Lapernat & Razouls (2002, p.19) the Itoh's index value = 657.3 (number of teeth: 8) on the right Md, and 672.2 on the left Md (number of teeth: 8).
In vertical tow 4000-3000 m (Harding, 1974).

After Ehrhardt (1967, p.888, 894) the species is found in the southwest Tyrrhenian Sea in water salinity between 37.21-38.51 p.1000 (mainly between 37.22- 37.79) and for the Oxygen between 4.61-6.40 cm3/l (mainly between 5.18-5.42).

See in DVP Conway & al., 2003 (version 1)
: R. Stephen, 2007 : Data sheets of NIO, Kochi, India (on line).

Pleuromamma abdominalis abdominalis    Lubbock, 1856   (F,M)
Syn.: P. abdominalis typica Steuer, 1931 (p.8, fig.F); 1932 a (p.12, figs.F,M); 1933 (p.5, figs.F,M); Dakin & Colefax, 1940 (p.85, figs.F); Vervoort, 1957 (p.124); Grice, 1962 (p.215, figs.F,M); Grice & Hart, 1962 (tab.3); Grice & Hulsemann, 1965 (p.224); Carter, 1977 (1978) (p.36); Jimenez-Perez & Lara-Lara, 1988; Rebstock, 2001 (tab.2); P. abdominalis abyssalis-thermophila Dakin & Colefax, 1940 (p.85, figs.M)
Ref.: Gaudy, 1962 (p.108, 133, figs.juv.,F); Mazza, 1962 (p.336, figs.F,M); Vervoort, 1965 (p.106, Rem.); Mazza, 1967 (p.186, Rem. juv.); Grice & Hulsemann, 1968 (tab.2); Park, 1970 (p.477); Longhurst, 1985 (tab.2); Lapernat, 1999 (p.23, 55), Lapernat & Razouls, 2001 (tab.1)
Loc: Antarct. (rare), sub-Antarct.(rare), Afr. S, Atlant., Congo, Mer des Antilles, Mer des Sargasses, Madère N, Irlande W, Médit., off Malte, Mer Rouge, Indien, Indonésie, Pacif., Australie (Nouvelle-Galles du Sud), Nouvelle-Zélande, Californie, G. de Californie, off Guatemala W, off Is. Juan Fernandez
Lg.: (16) F: 3,28-2,6; M: 3,15-2,74; (101) F: 3,13-2,85; M: 3,13-2,79; (207) F: 3,31-2,59; M: 3,54-2,93; (340) F: 3,2; 2,9; M: 4,25; 3

Pleuromamma abdominalis abyssalis    Steuer, 1931   (F,M)
Ref.: Steuer, 1931 (p.9, figs.M); 1932 a (p.13, figs.F,M); 1933 (p.8, figs.M); Farran, 1936 a (p.110, Rem.); Grice, 1962 (p.215, figs.M); Vervoort, 1965 (p.107)
Ref. compl.: Saraswathy, 1986 (p.192)
Loc: Afr. W & S, Féroé, Indien, Pacif.
Lg.: (34) F: 2,76-2,52; M: 2,68-2,4; (101) M: 3,06

Pleuromamma abdominalis edentata    Steuer, 1931   (F)
Ref.: Steuer, 1931 (p.8, fig.F); 1932 a (p.12, figs.F); 1933 (p.7, figs.F); Grice, 1962 (p.215, figs.F); Vervoort, 1965 (p.107); Vidal, 1968 (p.34, figs.F); Corral Estrada, 1970 (p.174, Rem.); Park, 1970 (p.477); Carter, 1977 (1978) (p.36); Dessier, 1979 (p.206); Longhurst, 1985 (tab.2); Jimenez-Perez & Lara-Lara, 1988; Rebstock, 2001 (tab.2)
Loc: Afr. W & S, SE, G. de Guinée, Mer des Antilles, Indien, Pacif. équatorial, Californie, G. de Californie, off Guatemala W
Lg.: (101) F: 3,06-2,75; (180) F: 3,31-3,29; M: 3,4; 3,33; (187) F: 3,35

[2] Pleuromamma antarctica  Steuer, 1931   (F,M)    [Figs]

[3] Pleuromamma borealis  (F. Dahl, 1893)   (F,M)    [Figs]

[4] Pleuromamma gracilis  (Claus, 1863)   (F,M)    [Figs]

Pleuromamma gracilis esterlyi    T. Scott, 1912   
Ref.: T. Scott, 1912 (1913) (p.535, figs.F); Vervoort, 1965 (p.111)
Rem.: Cf. Pleuromamma borealis

Pleuromamma gracilis gracilis    Claus, 1863   (F,M)
Syn.: Pleuromma gracile Claus, 1863 (p.197); T. Scott, 1894 b (p.42); Pleuromamma gracilis minima Steuer, 1931 (p.6); Grice, 1962 (p.218, figs.F, Rem.)
Ref.: Vervoort, 1965 (p.108, Rem.); Mazza, 1967 (p.187, Rem. juv.); Vilela, 1968 (p.23, figs.F); Corral Estrada, 1970 (p.177, figs.M)
Ref. compl.: Grice & Hulsemann, 1967 (p.17); Park, 1970 (p.477)
Loc: sub-Antarct., Afr. S, Congo, G. de Guinée, Canaries, Lisbonne, Mer des Antilles, Mer des Sargasses, Indien W, Japon (Suruga Bay), Pacif. équatorial, Californie
N: 8
Lg.: (16) F: 2-1,65; M: 1,58; (101) F: 2,07-1,8; (180) F: 1,98-1,8; M: 1,82-1,55; (207) F: 2,12-1,88; M: 1,9-1,65

Pleuromamma gracilis maxima    Steuer, 1931   (F,M)
Ref.: Steuer, 1931 (p.6); 1932 a (p.36, 50, 77, figs.F,M); 1933 (p.19); Dakin & Colefax, 1940 (p.85, figs.F,M); Tanaka, 1963 (p.24, Rem.); Vervoort, 1965 (p.109, 110); Deevey, 1966 (p.165); Bradford, 1971 b (p.24, fig.F); Lapernat, 1999 (p.24, 55); Lapernat & Razouls, 2001 (tab.1)
Loc: Antarct., Atlant., Médit., Indien, Japon, Nouvelle-Zélande
N: 2
Rem.: 2000 m (off Malte)

Pleuromamma gracilis minima    Steuer, 1931   
Ref.: Steuer, 1931 (p.6); 1932 a (p.33, 50, 77); 1933 (p.16, figs.F,M); Tanaka, 1963 (p.24, Rem.); Vervoort, 1965 (p.109, Rem.); Grice & Hulsemann, 1965 (p.224); Mazza, 1967 (p.187, Rem. juv.); Vidal, 1968 (p.33, figs.F,M)
Lg.: (26) F: 1,9-1,88; (207) F: 2,12-1,88; M: 1,9-1,65
Rem.: Cf. Pleuromamma gracilis gracilis

Pleuromamma gracilis piseki    Steuer, 1931   
Ref.: Steuer, 1931 (p.6); 1932 a (p.34, 50, 77, figs.F,M); 1933 (p.19, figs.F,M); Vervoort, 1957 (p.124, Rem.)
Rem.: Cf. Pleuromamma piseki Farran,1929

[5] Pleuromamma indica  Wolfenden, 1905   (F,M)    [Figs]

[6] Pleuromamma johnsoni  Ferrari & Saltzman, 1998   (F,M)    [Figs]

[7] Pleuromamma piseki  Farran, 1929   (F,M)    [Figs]

Pleuromamma princeps    T. Scott, 1894   (M)
Syn.: Pleuromma princeps T. Scott, 1894 b (p.42, Descr.M, figs.M)
Ref.: Hulsemann, 1988 (p.188, Rem.)
Loc: G. de Guinée
Rem.: Cf. Gaussia princeps

[8] Pleuromamma quadrungulata  (F. Dahl, 1893)   (F,M)    [Figs]

Pleuromamma quadrungulata quadrungulata    F. Dahl, 1893   (F,M)
Syn.: P. quadrungulata typica Steuer, 1931 (p.7); 1932 a (p.29); 1933 (p.16, figs.F,M); Vervoort, 1957 (p.124); Grice, 1961 (1962) (p.218, figs.F)
Ref.: Vervoort, 1965 (p.108, Rem.); Grice & Hulsemann, 1967 (p.17)
Loc: Atlant., Indien, Pacif.
Lg.: (16) F: 3,9-3,7; M: 3,3-3,15; (101) F: 3,77; 3,51

Pleuromamma quadrungulata psychrophila    Steuer, 1931   (F,M)
Ref.: Steuer, 1931 (p.7); 1932 a (p.29, fig.F); 1933 (p.16, fig.F); Marques, 1953 (p.115, fig.M); Vervoort, 1965 (p.108, Rem.); Bradford-Grieve,1999 b (p.124: Rem. Lg.F = 4,2-4,5 mm)
Loc: G.de Guinée, Angola, Afr. S, Indien, Nouvelle-Zélande (North Island SW)

Pleuromamma quadrungulata typica    Steuer, 1931   
Ref.: Steuer, 1931 (p.7); 1932 a (p.26, 29, 49, 63, 76); 1933 (p.16); Sewell, 1947 (p.169, Rem.); Vervoort, 1965 (p.108, Rem.); Bradford-Grieve,1999 b (p.124: Rem. Lg.F = 4,45 mm)
Rem.: Cf. Pleuromamma quadrungulata quadrungulata

[9] Pleuromamma robusta  (F. Dahl, 1893)   (F,M)    [Figs]

Pleuromamma robusta antarctica    Steuer, 1931   (F,M)
Syn.: Pleuromamma robusta : Mackintosh, 1934 (p.85); Hardy & Gunther, 1935 (p.167)
Ref.: Steuer, 1931 (p.8, fig.F); 1932 a (p.24, figs.F,M); 1933 (p.13, figs.F); Vervoort, 1951 (p.123, figs.F,M); 1957 (p.125, Rem.); 1965 (p.107); Ramirez, 1969 (p.73, figs.F,M); Bradford, 1972 (p.46); Séret, 1979 (p.139, figs.F,M); Zmijewska, 1987 (tab.2a); Razouls, 1994 (p.146, figs.F,M, Rem); Errhif & al., 1997 (p.422); Ferrari & Saltzman, 1998 (p.217, Rem.); Bradford-Grieve,1999 b (p.124: Rem. Lg.F = 3,9-4,1 mm)
Loc: Antarc., sub-Antarct., Indien S (convergence subtropicale), Nouvelle-Zélande
Lg.: (25) F: 4,5-3,65; M: 3,6-3,06; (31)4,55-4; M: 3,1
Rem.: méso-bathypélagique. Cf.: Pleuromamma antarctica

Pleuromamma robusta robusta    F. Dahl, 1893   (F,M)
Syn.: Pleuromma robustum F. Dahl,1893; Pleuromamma robusta typica Steuer, 1931 (p.7); 1932 a (p.24, figs.F,M); 1933 (p.12, figs.F,M)
Ref.: Vervoort, 1965 (p.107, Rem.); Bradford, 1972 (p.46); Baessa de Aguiar, 1986 (1989) (p.60, Rem.); Razouls, 1994 (p.146, figs.F)
Loc: Antarct., G. de Guinée, Canaries, Nouvelle-Zélande
Lg.: (16) F: 3,23-2,65

Pleuromamma robusta typica    Steuer, 1931   (F,M)
Ref.: Steuer, 1931 (p.7); 1932 a (p.24); 1933 (p.12); Vervoort, 1957 (p.125); Bradford-Grieve,1999 b (p.124: Rem. Lg.F = 3,5-4,0)
Rem.: Cf. Pleuromamma robusta robusta

[10] Pleuromamma scutullata  Brodsky, 1950   (F,M)    [Figs]

Pleuromamma wolfendeni    Brady, 1918   (F)
Ref.: Brady, 1918 (p.26, Descr.F, figs.F); Sewell, 1948 (p.575, Rem.)
Loc: sub-Antarct. (I. Macquarie)
Rem.: forme juvénile. Cf.?

[11] Pleuromamma xiphias  (Giesbrecht, 1889)   (F,M)    [Figs]

Pleuromamma xiphias f. major       
Ref.: Sewell, 1947 (p.169, Rem.)
Loc: G. d’Aden, Mer Arabe, Maldives
Lg.: (11) F: 5,379-4,536; M: 5,9-5,017

Pleuromamma xiphias f. minor       
Ref.: Sewell, 1947 (p.171)
Loc: G. d’Aden, Mer Arabe, Maldives
Lg.: (11) F: 4,52-4,133; M: 4,759-4,235

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