Siphonostomatoida ( Order )
Rataniidae Giesbrecht, 1897 ( Siphonostomatoida )
Ref.: Giesbrecht, 1897 (p.19); 1899 (p.105); Rose, 1939 (p.30, Rem.); Saraswathy, 1961 (p.141); Heron & Damkaer, 1969 (p.18); Razouls, 1982 (p.720); Bowman & Abele,1982 (p.13); Marcotte, 1982 (p.195); Huys & Boxshall,1991 (p.422); Razouls,1993 (p.213); Boxshall & Halsey, 2004 (p.16; 815: Def.); Vives & Shmeleva, 2010 (p.407, Rem.)
Rem.: Pelagic. 1 G.: Ratania.

Family Rataniidae - Plate 1Issued from : G.A. Boxshall & S.H. Halsey in The Ray Society, 2004, N°166, Part II. [p.816, Fig.280].
A, Ratania atlantica female; B, Ratania flava male; C, A2; D, female P5; E, Md; F, male A1; G, Mx1.
From Boxshall, 1979.

Family Rataniidae - Plate 2Issued from : G.A. Boxshall & S.H. Halsey in The Ray Society, 2004, N°166, Part II. [p.815].
Armature formula of swimming legs P1 to P4.
Nota: Swimming legs P1 to P4 biramous, with 3-segmented rami. Intercoxal sclerites present in legs P1 to P4. Inner seta on basis of P1 absent; inner coxal seta present in P1 to P4.
- P5 comprising a protopodal segment incorporated into somite and free 1-segmented exopod, armed with 5 setae in both sexes.
- P6 represented by 2 small spines on genital operculum in female and by 1 seta on genital operculum in male.
(1) Ratania Giesbrecht, 1892
Ref.: Giesbrecht, 1892 (p.83, 616); 1899 (p.105); Wilson, 1932 a (p.588); Rose, 1933 a (p.284); 1939 (p.28); Saraswathy, 1961 (p.141); Ummerkutty, 1968 (p.303: Rem.): Boxshall, 1979 (p.238); Razouls, 1982 (p.720); 1993 (p.313); Boxshall & Halsey, 2004 (p.815: spp. key); Vives & Shmeleva, 2010 (p.407, Rem., spp. Key.)
Rem.: type: Ratania flava Giesbrecht,1891. Total: 2 spp.

Key to species after Boxshall & Halsey [p.815]:
- Female A1 5-segmented, with apical aesthetasc longer than entire A1; male A1 7-segmented .............Ratania flava.
- Female A1 7-segmented, with apical aesthetasc shorter than entire A1; male A1 9-segmented .......Ratania arlantica.
Remarks on dimensions and sex ratio:
The mean female size is 1.825 mm (n = 4; SD = 0.7932) and the mean male size is 1.853 mm (n = 4; SD = 0.8857). The size ratio (male/female) is 0.92 - 1.63, or approximately 101.5 %. The sex ratio (female/male) is 1 (in 2014).

 Any use of this site for a publication will be mentioned with the following reference :

Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2023. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at [Accessed December 04, 2023]

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Marine Planktonic Copepods

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