Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Diaixidae ( Family )
            Diaixis ( Genus )
Diaixis pygmaea  (T. Scott, 1896)   (F,M)
Syn.: Scolecithrix pygmaea T. Scott (after Pearson, 1906, p.19).
Diaixis durani : Corral Estrada, 1972 a (p.51, Descr.M, figs.M); Andronov, 1979 (p.95, Descr.F, figs.F,M); Andronov & Maigret, 1980 (p.71, Table 2); Vives, 1982 (p.292); Valdés & al., 1990 (tab.2); Bradford & al., 1983 (p.123); Valdés & al., 2007 (p.104: tab.1); Bode & al., 2003 (p.85, Table 1, abundance);
Ref.:
van Breemen, 1908 a (p.82, figs.F,M); Pesta, 1920 (p.518); Früchtl, 1924 (p.220, Rem.: parasite); Rose, 1933 a (p.160, figs.F,M); Bradford & al., 1983 (p.123); Avancini & al., 2006 (p.89, Pl. 58, figs.F,M, Rem.); Vives & Shmeleva, 2007 (p.641, figs.F,M, Rem.)
Species Diaixis pygmaea - Plate 1 of morphological figuresissued from : M. Rose in Faune de France, 1933, 26. [p.160, Fig.178]. After Sars, 1925.
Female: habitus.
Nota: head and Th1 fused, Th4 and Th5 separate. Postero-lateral corners of Th5 acute.

Male: P5.


Species Diaixis pygmaea - Plate 2 of morphological figuresissued from : V.N. Andronov in Arthropoda Selecta, 2002, 11 (1). [p.25, Figs.72-81]. After Andronov, 1979.
Female: 72-73, habitus (dorsal and lateral, respectively); 74, rostrum; 75, segment thoracic 5 (left lateral side); 76, urosome (ventral); 77, genital segment and urosomal segment 2 (left lateral side); 78, distal end of Mx2.

Male: 79, P5; 80-81, distal end of left P5 (different views).


Species Diaixis pygmaea - Plate 3 of morphological figuresissued from : V.N. Andronov in Byull. Mosk. Obshch. Ispyt. Prir. , Otdel Biol., n. ser., 1979, 84 (4). [p.96, Figs.14-28]. As Diaixis durani.
Female (from W coast Africa): 14, 16, habitus (dorsal and lateral, respectively); 15, rostrum; 17-20, P1 to P4; 21, last thoracic segment (left lateral side); 22, genital segment and urosomal segment 2 (left lateral side); 23, urosome (ventral); 24, A2; 25, Mx1; 26, distal segments of Mx2; 27, Mxp; 28, Md.

Compl. Ref.:
Pearson, 1906 (p.19, Rem.); Rose, 1925 (p.152); Rose & Vaissière, 1952 a (p.120); Mazza, 1966 (p.71); Paulmier, 1971 (p.168); Apostolopoulou, 1972 (p.328, 352); Comaschi Scaramuzza, 1978 (p.17); Kovalev & Shmeleva, 1982 (p.84); Vives, 1982 (p.292); Regner, 1985 (p.11, Rem.: p.32); Comaschi Scaramuzza, 1987 (tab.1); Pancucci-Papadopoulou & al., 1990 (p.199); Ragosta & al., 1995 (Appendix A); Hajderi, 1995 (p.542); Hure & Krsinic, 1998 (p.53, 101); Siokou-Frangou, 1999 (p.476); Holmes, 2001 (p.54); Beaugrand & al., 2002 (p.179, figs.5, 6); Vukanic, 2003 (139, tab.1); Isari & al., 2006 (p.241, tab.II); Valdés & al., 2007 (p.104: tab.1); Cabal & al., 2008 (289, Table 1); Brugnano & al., 2010 (p.312, Table 3); Mazzocchi & Di Capua, 2010 (p.425); Mazzocchi & al., 2011 (p.1163, fig.6, long-term time-series 1984-2006); Isari & al., 2011 (p.51, Table 2, abundance vs distribution); Madurell & al., 2012 (p.1078, submarine pump); Mazzocchi & al., 2012 (p.135, annual abundance 1984-2006); Aubry & al., 2012 (p.125, table 3, fig. 8 a, b, interannual variation); Belmonte & al., 2013 (p.222, Table 2, abundance vs stations); Lidvanov & al., 2013 (p.290, Table 2, % composition) ; Benedetti & al., 2016 (p.159, Table I, fig.1, functional characters); Belmonte, 2018 (p.273, Table I: Italian zones)
NZ: 4

Distribution map of Diaixis pygmaea by geographical zones
Species Diaixis pygmaea - Distribution map 3Issued from : M.G. Mazzocchi, L. Dubroca, C. Garcia-Comas, I. Di Capua & M. Ribera d'Alcalà in Progr. Oceanogr., 2012, 97-100. [p.143, Fig.10].
Long-term variability of the abundance (Ind. m3) of rare copepod species that disappeared in the second period of the time-series at Station MC (Gulf of Naples), by vertical tows in the upper 50 m.
Loc:
Angola, Congo, Morocco-Mauritania, off Madeira, off Coruña, NW Spain, Bay of Biscay (Belon estuary), Scotland, Ireland, Medit. (Algiers, Balearic Sea, G. of Lion (Thau Lagoon), Ligurian Sea, Tyrrhenian Sea, G. of Naples, Taranto, Adriatic Sea, Venise, G. of Manfredonia, Aegean Sea, Thracian Sea, Lebanon Basin, Marmara Sea),
N: 43
Lg.:
(307) F: 0,95; M: 0,95; (379) F: 0,86-0,74; M: 0,74-0,68; (380) M: 0,76; (449) F: 0,95; (881) F: 0,74-0,95; M: 0,68-0,74; {F: 0,74-0,95; M: 0,68-0,95}
Rem.: hyperbenthic. Sampling depth: 0-300 m.
A doubt subsists concerning the validity or the synonymy from Diaixis durani; Othman & Greenwood (1994, p.988) the species is considered as valid.
Last update : 05/02/2020
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2021. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed October 25, 2021]

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