Species Card of Copepod
Calanoida ( Order )
    Calanoidea ( Superfamily )
        Calanidae ( Family )
            Mesocalanus ( Genus )
Mesocalanus tenuicornis  (Dana, 1849)   (F,M)
Syn.: Calanus tenuicornis Dana,1849; Giesbrecht, 1892 (p.90, 129, figs.F,M); Giesbrecht & Schmeil, 1898 (p.18); Cleve, 1904 a (p.186); Esterly, 1905 (p.127, figs.M, Rem.F,M); Pearson, 1906 (p.5); Farran, 1908 b (p.20); A. Scott, 1909 (p.8); Sewell, 1914 a (p.193); Pesta, 1920 (p.496); Farran, 1926 (p.227); 1929 (p.207, 217); Sewell, 1929 (p.20); Mori, 1929 (p.170, Figs.F,M); Rose, 1929 (p.8); 1933 a (p.62, figs.F,M); Dakin & Colefax, 1933 (p.204); Farran, 1936 a (p.77); Mori, 1937 (1964) (p.16, figs.F,M); Dakin & Colefax, 1940 (p.87, figs.F,M); Vervoort, 1946 (p.22, Rem.); Sewell, 1948 (p.347, 513, 519, 544, 555, 565); Brodsky, 1950 (1967) (p.96, figs.F,M); C.B. Wilson, 1950 (p.269); Vervoort, 1951 (n°32, p.3, figs.F,M); Bowman, 1955 (p.413, figs.F,M, Rem.); Tanaka, 1956 (p.255); Chiba & al., 1957 (p.306); 1957 a (p.11); Yamazi, 1958 (p.146); Gaudy, 1962 (p.93, 99, Rem.: p.101); Grice & Hart, 1962 (p.287, table 3); Grice, 1962 (p.175, Rem.); Ahlstrom & Thrailkill, 1963 (p.57, Table 5, abundance); V.N. Greze, 1963 a (tabl.2); Shmeleva, 1963 (p.141); Björnberg, 1963 (p.10, Rem.); Kasturirangan, 1963 (p.10, figs.F,M); Unterüberbacher, 1964 (p.13); De Decker, 1964 (p.14, 18, 29); De Decker & Mombeck, 1964 (p.11); Grice & Hulsemann, 1965 (p.223); Chen & Zhang, 1965 (p.28, figs.F,M); Shmeleva, 1965 b (p.1350, lengths-volume -weight relation); Pavlova, 1966 (p.43); Furuhashi, 1966 a (p.295, vertical distribution in Oyashio/kuroshio transitional area, Table 7, 10); Fleminger, 1967 a (tabl.1); Ehrhardt, 1967 (p.737, 887, figs.51-53, geographic distribution), Rem.); Grice & Hulsemann, 1967 (p.13); Delalo, 1968 (p.137); Vilela, 1968 (p.7, fig.M); Vidal, 1968 (p.14, figs.F); De Decker, 1968 (p.45); Park, 1968 (p.532, Rem.); Mullin, 1969 (p.438, biogéo); Park, 1970 (p.474); Morris, 1970 (p.2300); Corral Estrada, 1970 (p.64, figs.F,M); Dowidar & El-Maghraby, 1970 (p.267); Deevey, 1971 (p.224); Marshall & Orr, 1972 (p.8); Brodsky, 1972 (1975) (p.9, 69, 85, 121, figs.); Bradford, 1972 (p.31, fig.F); Razouls, 1972 (p.91, Tableau XXVI, XXVII, Annexe: p.5, figs.F,M); Bainbridge, 1972 (p.61, Appendix Table I: vertical distribution vs day/night); Boucher & Thiriot, 1972 (p.47, Tableau 4); Grice, 1972 (p.175); Roe, 1972 (p.277, tabl.1, tabl.2); 1972 a (p.318); Heinrich, 1973 (p.95); Björnberg, 1973 (p.287, 384); Ikeda, 1974 (p.1, respiration ammonia excretion rate); Corral Estrada & Pereiro Muñoz, 1974 (tab.I); Harding, 1974 (p.141, tab.3, gut contents); Peterson & Miller, 1975 (p.642, 650, Table 3, interannual abundance); Vives & al., 1975 (p.35, tab.II, III, IV); Peterson & Miller, 1976 (p.14, Table 1, 2, 3, abundance vs interannual variations); Vyshkvartzeva, 1976 (p.14); 1977 a (p.97, figs.); Carter, 1977 (1978) (p.35); Peterson & Miller, 1977 (p.717, Table 1, seasonal occurrence); Deevey & Brooks, 1977 (p.256, Table 2, Station "S"); Dawson & Knatz, 1980 (p.5, F,M); Sreekumaran Nair & al., 1981 (p.493), Björnberg & al., 1981 (p.616, figs.F,M); Brenning, 1981 (p.1, Rem.: p.4); Kovalev & Shmeleva, 1982 (p.82); Alvarez-Marques, 1984 (p.112, figs.F,M, annual abundance); De Decker, 1984 (p.315, 332: carte); Scotto di Carlo & al., 1984 (p.1042); Cummings, 1984 (p.163, Table 2); Brenning, 1985 a (p.3, Table 2); Regner, 1985 (p.11, Rem.: p.22); Brinton & al., 1986 (p.228, Table 1); Ambler & Miller, 1987 (tab.2, 3, 4, 5); Lozano Soldevilla & al., 1988 (p.57); Jimenez-Perez & Lara-Lara, 1988; Hernandez-Trujillo, 1989 a (tab.1); Suarez & al., 1990 (tab.2); Valdes & al., 1990 (tab.2); Scotto di Carlo & al., 1991 (p.271); Yoo, 1991 (tab.1); Suarez & Gasca, 1991 (tab.2); Morales C.E. & al., 1991 (p.455, Table I, grazing); Rosales & Sepulveda, 1992 (p.38); Ayukai & Hattori, 1992 (p.163, Table 5, fecal pellet production rate); Suarez, 1992 (App.1); Ashjian & Wishner, 1993 (p.483, abundance, species group distributions); Morales C.E. & al., 1993 (p.185); Seguin & al., 1993 (p.23); Landry & al., 1994 (p.55, abundance, grazing); Hays & al., 1994 (tab.1); Suarez-Morales, 1998 (p.345, Table 1); Harvey & al., 1999 (p.1, 49: Appendix 5, in ballast water vessel); Gomez-Gutiérrez & Peterson, 1999 (p.637, Table II, abundance); Moraitou-Apostolopoulou & al., 2000 (tab.I); Sautour & al., 2000 (p.531, Table II, abundance); Weikert & al., 2001 (p.227, tab.4, Rem.); Pakhomov & al., 2000 (p.1663, Table 2, transect Cape Town-SANAE antarctic base); Hernandez-Trujillo & Esqueda-Escarcega, 2002 (in Appendix); Vukanic, 2003 (p.139, tab.1); Vukanic & Vukanic, 2004 (p.9, tab. 2, 3); Selifonova, 2011 a (p.77, Table 1, alien species in Black Sea); Maiphae & Sa-ardrit, 2011 (p.641, Table 2); Sobrinho-Gonçalves & al., 2013 (p.713, Table 2, fig.8, seasonal abundance vs environmental conditions);
Neocalanus tenuicornis : Sars, 1925 (p.9); Wilson, 1942 a (p.195); Lysholm & al., 1945 (p.7); C.B. Wilson, 1950 (p.269); Brodsky, 1962 c (p.98); Fagetti, 1962 (p.7); Chen & Zhang, 1965 (p.28, figs.F,M); Mazza, 1966 (p.69); Brodsky, 1972 (1975) (p.116); Vives & al., 1975 (p.35, tab.II); Zheng & al., 1982 (p.7, figs.F,M); Brodsky & al., 1983 (p.185, figs.F,M); Guangshan & Honglin, 1984 (p.118, tab.); Kouwenberg, 1994 (tab.1); Go & al., 1997 (tab.1); Park & Choi, 1997 (Appendix); Hure & Krsinic, 1998 (p.15, 99); Padmavati & al., 1998 (p.349); Hwang & al., 1998 (tab.II); Mauchline, 1998 (tab.30); Bragina, 1999 (p.195); Wang & Zuo, 2004 (p.1, Table 2, dominance, origin); Ashjian & al., 2005 (p.1380: tab.2); Gaard & al., 2008 (p.59, Table 1, N Mid-Atlantic Ridge); Pagano, 2009 (p.115);
Neocalanus tenuicornis : Noda & al., 1998 (p.55, Table 3, occurrence); El-Sherif & Aboul Ezz, 2000 (p.61, Table 3: occurrence)
Ref.:
Bradford & Jillett, 1974 (p.12, figs.F,M); Gardner & Szabo, 1982 (p.148, figs.F,M); Mackas & Sefton, 1982 (p.1179); Fleminger, 1985 (p.276, 285, Table 1, 4, fig.M, Rem.: A1); Bradford,1988 (p.74, 76); Nishida, 1989 (p.173, fig. 3, table 1, 2, 3: dorsal hump); Bradford-Grieve, 1994 (p.38, figs.F,M, Rem., fig.98); Chihara & Murano, 1997 (p.741, Pl.69: F,M); Bradford-Grieve & al., 1999 (p.877, 907, figs.F,M); Bucklin & al., 2003 (p.335, tab.2, fig. 4, Biomol.); Conway & al., 2003 (p.147, figs.F,M, Rem.); Boxshall & Halsey, 2004 (p.81: fig.M); Avancini & al., 2006 (p.60, Pl. 29, figs.F,M, Rem.); Vives & Shmeleva, 2007 (p.898, figs.F,M, Rem.); Blanco-Bercial & al., 2014 (p.5: Rem.: problematical for barcoding)
Species Mesocalanus tenuicornis - Plate 1 of morphological figuresissued from : J.M. Bradford-Grieve in The Marine Fauna of New Zealand: Pelagic Calanoid Copepoda. National Institute of Water and Atmospheric Research (NIWA). New Zealand Oceanographic Institute Memoir, 102, 1994. [p.39, Fig.14].
Female: A, habitus (dorsal); B, idem (right lateral side); C, P5.
Nota: Li 1 of Mx2 with 4 setae. Endopodite 1 of P1 without inner seta. Endopodite of P5 with 7 setae.

Male: D, habitus (dorsal); E, P5.
Nota: Left P5 slightly modified, not prehensile. Exopodite 1 of P2 without recurved spine (hook) adjacent to outer spine. Coxa of P5 with inner edge without teeth. Both endopodite of P5 with 7 setae each.


Species Mesocalanus tenuicornis - Plate 2 of morphological figuresissued from : J.M. Bradford & J.B. Jillett in Crustaceana, 1974, 27 (1). [p.14, Fig.2,G,M].
Female: G, P5.

Male: M, P5 (L = left, R = right).


Species Mesocalanus tenuicornis - Plate 3 of morphological figuresissued from: Q.-c Chen & S.-z. Zhang in Studia Marina Sinica, 1965, 7. [Pl.2, 4-8]. As Neocalanus tenuicornis.
Female (from E China Sea): 4, habitus (dorsal); 5, idem (lateral right side); 6, endopod of P1 (anterior).

Male: 7, habitus (dorsal); 8, left P5 (posterior).


Species Mesocalanus tenuicornis - Plate 4 of morphological figuresissued from : J. Corral Estrada in Tesis Doct., Univ. Madrid, A-129, Sec. Biologicas, 1970. [Lam.4]. As Calanus tenuicornis.
Female (from Canarias Is.): 1, habitus (dorsal); 2, urosome (ventral).

Male: 3, habitus (dorsal); 4, P5.


Species Mesocalanus tenuicornis - Plate 5 of morphological figuresissued from : W. Giesbrecht in Fauna Flora Golf. Neapel, 1892, 19. [Taf.8, Fig.27]. As Calanus tenuicornis.
Male: 27, P5 (anterior surface).


Species Mesocalanus tenuicornis - Plate 6 of morphological figuresissued from : W. Giesbrecht in Fauna Flora Golf. Neapel, 1892, 19. [Taf.8, Fig.18]. As Calanus gracilis.
Female; 18, P5 (anterior surface).
B1 = basipodite 1 (= Coxa); B2 = basiopodite 2 (= Basis): Re = exopodite; Ri = endopodite.


Species Mesocalanus tenuicornis - Plate 7 of morphological figuresissued from : T. Mori in The pelagic Copepoda from the neighbouring waters of Japan, 1937 (1964). [Pl.3, Figs.9-10]. As Calanus tenuicornis.
Female: 9, P5 (posterior); 10, P1 (anterior).


Species Mesocalanus tenuicornis - Plate 8 of morphological figuresissued from : T. Mori in The pelagic Copepoda from the neighbouring waters of Japan, 1937 (1964). [Pl.4, Figs.1-3]. As Calanus tenuicornis.
Female: 2, habitus (lateral).

Male: 1, habitus (dorsal); 3, P5.


Species Mesocalanus tenuicornis - Plate 9 of morphological figuresissued from : Z. Zheng, S. Li, S.J. Li & B. Chen in Marine planktonic copepods in Chinese waters. Shanghai Sc. Techn. Press, 1982 [p.8, Fig.2]. As Neocalanus tenuicornis.
Female: a-b, habitus (dorsal and lateral, respectively); c, P1; d, P3; e, P5.

Male: f, habitus (dorsal); g, urosome (dorsal); h, head (lateral); i, P1; j, P5.

Scale bars in mm.


Species Mesocalanus tenuicornis - Plate 10 of morphological figuresissued from : J.M. Bradford in Mem. N. Z. Oceonogr. Inst., 1972, 54. [p.33, Fig.4 (4)].
Female (from Kaikoura, New Zealand): 4, habitus (lateral).
Nota: Proportional lengths of abdominal segments 2 and 3: 4.8:3.8.

Scale bar: 1 mm.


Species Mesocalanus tenuicornis - Plate 11 of morphological figuresissued from T. Mori inZool. Mag. Tokyo, 1929, 41 (486-487). [Pl. III, Figs.20-23]. As Calanus tenuicornis.
Female (from Chosen Strait, Korea-Japan): 20, urosome; 21, P2; 22, P3; 24, P5.


Species Mesocalanus tenuicornis - Plate 12 of morphological figuresissued from T. Mori inZool. Mag. Tokyo, 1929, 41 (486-487). [Pl. IV, Fig.1]. As Calanus tenuicornis.
Female: 1, A1.


Species Mesocalanus tenuicornis - Plate 13 of morphological figuresissued from : A. Fleminger in Mar. Biol., 1985, 88. [p.284, Fig.6, G].
Male (NE, SE Pacific): Left A1 proximal segments (ventral view);
Nota: see remarks in Calanus s.l. pacificus californicus (Fleminger, 1985, p.275) concerning the dimorphism in the female A1.


Species Mesocalanus tenuicornis - Plate 14 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. - Fauna Flora Golf. Neapel, 1892, 19 , Atlas von 54 Tafeln. [Taf.6, Fig.13]. As Calanus tenuicornis.
Female: 13, habitus (dorsal).
Ce = cephalothorax; Th = thoracic segment; Ab1-2 = urosomal segment 1 (genital segment: = genital double-somite).


Species Mesocalanus tenuicornis - Plate 15 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. - Fauna Flora Golf. Neapel, 1892, 19 , Atlas von 54 Tafeln. [Taf.6, Fig.12]. As Calanus tenuicornis
Male: 12, habitus (dorsal).
Ce = cephalothorax; Th1 = thoracic segment 1; Ab 5 = anal segment.


Species Mesocalanus tenuicornis - Plate 16 of morphological figuresIssued from : W. Giesbrecht in Systematik und Faunistik der Pelagischen Copepoden des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. - Fauna Flora Golf. Neapel, 1892, 19 , Atlas von 54 Tafeln. [Taf.7, Fig.5]. As Calanus tenuicornis
Female: 5, masticatory edge of Md (anterior view).


Species Mesocalanus tenuicornis - Plate 17 of morphological figuresIssued from : F. Alvarez-Marques in Rev. Biol. Univ. Oviedo, 1984, 2. [p.115, Pl. I, Figs.7, 8, 9].
Female (from off Gijon, NW Spain): 7, habitus (lateral); 8, urosome (dorsal); 9, urosome (lateral) with spermatheca)


Species Mesocalanus tenuicornis - Plate 18 of morphological figuresIssued from : M. Chihara & M. Murano in An Illustrated Guide to Marine Plankton in Japan, 1997. [p.748, Pl. 69, fig.90 a-c].
Female: c, P5.

Male: a, habitus (lateral); b, P5.


Species Mesocalanus tenuicornis - Plate 19 of morphological figuresssued from : K.A. Brodsky, N.V. Vyshkvartzeva, M.S. Kos & E.L. Markhaseva in Opred. Faune SSSR, 1983, 135. [p.186, Fig.81]. As Neocalanus tenuicornis.
Female and Male (after Brodsky, 1948, 1950, 1972).


Species Mesocalanus tenuicornis - Plate 20 of morphological figuresIssued from M. Rose in Résult. Camp. scient. Prince Albert I, 1929, 78, p.7.
Remarques concernant Neocalanus tenuicornis ( = Mesocalanus tenuicornis) identifié aux cours des campagnes de 1911 et 1912.


Species Mesocalanus tenuicornis - Plate 21 of morphological figuresIssued from : M.C. Kos in Field guide for plankton. Zool Institute USSR Acad., Vol. I, 1972. As Calanus (Neocalanus) tenuicornis. After Brodsky, 1950.
Female : 1, habitus (dorsal); 2, same with A1 (lateral); 5, P5.
Male: 3, habitus (dorsal); 4, P1; 6, P5.

Compl. Ref.:
Mackas & Sefton, 1982 (p.1173, Table 1); Vives, 1982 (p.290); Dessier, 1983 (p.89, Tableau 1, Rem., %); Tremblay & Anderson, 1984 (p.4, Rem.); Roe, 1984 (p.356); Cooney & Coyle, 1985 (p.310); Wishner & Allison, 1986 (tab.2); Madhupratap & Haridas, 1986 (p.105, tab.1); Hirakawa & al., 1990 (tab.3); Hirakawa, 1991 (p.376: fig.2); Shih & Marhue, 1991 (tab.2, 3); Hattori, 1991 (tab.1, Appendix); Hirakawa & al., 1995 (tab.2); Shih & Young, 1995 (p.68); Kotani & al., 1996 (tab.2); Siokou-Frangou, 1997 (tab.1); Suarez-Morales & Gasca, 1997 (p.1525); Alvarez-Cadena & al., 1998 (t.4); Suarez-Morales & Gasca, 1998 a (p108); Kovalev & Piontkovski, 1998 (p.214, 217, Rem.); Dolganova & al., 1999 (p.13, tab.1); Goldblatt & al., 1999 (p.2619, tabl. 2); Razouls & al., 2000 (p.343, Appendix); Seridji & Hafferssas, 2000 (tab.1); Haury & al., 2000 (p.69, Table 1, Fig.7); Mackas & al., 2001 (p.685, Tab. 3, 6, fig.3: interannual changes in species composition); Rebstock, 2001 (tab.2); 2002 (p.71, Table 3, 5, Fig.2, climatic variability); Holmes, 2001 (p.38); Peterson & al., 2002 (p.353); Peterson & al. 2002 (p.381, Table 2, interannual abundance); Beaugrand & al., 2002 (p.1692); Beaugrand & al., 2002 (p.179, fig.5, 6); Yamaguchi al., 2002 (p.1007, tab.1); Mackas & Galbraith, 2002 (p.725, tab.2a, 2b); 2002 a (p.423, Table 2); Bode & al., 2003 (p.85, Table 1, abundance); Peterson & Keister, 2003 (p.2499, interannual variability); Keister & Peterson, 2003 (p.341, Table 2, abundance, cluster species vs hydrological events); Shimode & Shirayama, 2004 (tab.2); Hsiao & al., 2004 (p.325, tab.1); Hsieh & al. 2004 (p.397,tab. 1); Daly Yahia & al., 2004 (p.366, fig.1); CPR, 2004 (p.56, fig.163); Lo & al., 2004 (p.89, tab.1); Fernandez & al., 2004 (p.501, tab.5); Shimode & al., 2005 (p.113 + poster); Mackas & al., 2004 (p.875, Table 2); Waggett, 2005 (p.17, Table 3.3, behaviour); Mackas & al., 2005 (p.1011, 1021, tab.2, 3); Prusova & Smith, 2005 (p.76); Zuo & al., 2006 (p.162: tab.1); Isari & al., 2006 (p.241, tab.II); Lavaniegos & Jiménez-Pérez, 2006 (p.147, tab.2, 4, Rem.); Mackas & al., 2006 (L22S07, Table 2); Ware & McQueen, 2006 (p.28, Table B1, weight ranges); Zervoudaki & al., 2006 (p.149, Table I); Hooff & Peterson, 2006 (p.2610); Koppelmann & Weikert, 2007 (p.266: tab.3); Alabaina & Irigoien, 2007 (p.435: Tab.1); Valdés & al., 2007 (p.103: tab.1); Cornils & al., 2007 (p.278, Table 2); Mackas & al., 2007 (p.223, climatic change index); Cabal & al., 2008 (289, Table 1); Humphrey, 2008 (p.84: Appendix A); Neumann-Leitao & al., 2008 (p.799: Tab.II, fig.6); Morales-Ramirez & Suarez-Morales, 2008 (p.518); Fernandes, 2008 (p.465, Tabl.2); Gaard & al., 2008 (p.59, Table 1, N Mid-Atlantic Ridge); Ohtsuka & al., 2008 (p.115, Table 4); Tseng L.-C. & al., 2008 (p.153, Table 2, occurrence vs geographic distribution); Raybaud & al., 2008 (p.1765, Table A1); Waggett & Buskey, 2008 (p.111, fig.2, Table 1); Galbraith, 2009 (pers. comm.); Miyashita & al., 2009 (p.815, Tabl.II); Labat & al., 2009 (p.1746, Table 2); Brugnano & al., 2010 (p.312, Table 3); Hafferssas & Seridji, 2010 (p.353, Table 2); Williamson & McGowan, 2010 (p.273, Table 3, Pacific central gyres: N and S); Cornils & al., 2010 (p.2076, Table 3); Schnack-Schiel & al., 2010 (p.2064, Table 2: E Atlantic subtropical/tropical); Hidalgo & al., 2010 (p.2089, Table 2); Mazzocchi & Di Capua, 2010 (p.424); Medellin-Mora & Navas S., 2010 (p.265, Tab. 2); Nowaczyk & al;, 2011 (p.2159, Table 2); Hsiao S.H. & al., 2011 (p.475, Appendix I); Batten & Walne, 2011 (p.1643, Table I, abundance vs temperature interannual variability); Andersen N.G. & al., 2011 (p.71, Fig.3: abundance); Tseng L.-C. & al., 2011 (p.47, Table 2, occurrences vs mesh sizes); Mazzocchi & al., 2011 (p.1163, fig.6, long-term time-series 1984-2006); Isari & al., 2011 (p.51, Table 2, abundance vs distribution); Mazzocchi & al., 2012 (p.135, annual abundance 1984-2006); Shiganova & al., 2012 (p.61, Table 4); Uysal & Shmeleva, 2012 (p.909, Table I); Miloslavic & al., 2012 (p.165, Table 2, transect distribution); Jang M.-C & al., 2012 (p.37, abundance and seasonal distribution); Brugnano & al., 2012 (p.207, Table 2); Dorgham & al., 2012 (p.473, Table 4: abundance vs season); Lavaniegos & al., 2012 (p. 11, Appendix); Hidalgo & al., 2012 (p.134, Table 2, 3, figs.6, 8, occurrence vs hydrology); Takahashi M. & al., 2012 (p.393, Table 2, water type index); Belmonte & al., 2013 (p.222, Table 2, abundance vs stations); in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, comm. pers.); Siokou & al., 2013 (p.1313, fig.4, 8, biomass, vertical distribution); Lidvanov & al., 2013 (p.290, Table 2, % composition); Hwang & al., 2014 (p.43, Appendix A: seasonal abundance); Fernandez de Puelles & al., 2014 (p.82, Table 3, seasonal abundance); Mazzocchi & al., 2014 (p.64, Table 3, 4, 5, spatial & seasonal composition %); Fierro Gonzalvez, 2014 (p.1, Tab. 3, 5, occurrence, abundance); Chiba S. & al., 2015 (p.968, Table 1: length vs climate); Zakaria & al., 2016 (p.1, Table 1); Benedetti & al., 2016 (p.159, Table I, fig.1, functional characters); Jerez-Guerrero & al., 2017 (p.1046, Table 1: temporal occurrence) ; Ohtsuka & Nishida, 2017 (p.565, Table 22.1); Benedetti & al., 2018 (p.1, Fig.2: ecological functional group); Belmonte, 2018 (p.273, Table I: Italian zones); Chaouadi & Hafferssas, 2018 (p.913, Table II: occurrence)Hure M. & al., 2018 (p.1, Table 1: abundance, % composition); Hirai & al., 2020 (p.1, Fig. 5: cluster analysis (OTU), spatial distribution).
NZ: 22

Distribution map of Mesocalanus tenuicornis by geographical zones
Species Mesocalanus tenuicornis - Distribution map 4issued from : T.S.K. Björnberg in Bol. Inst. Oceanogr., Sao Paulo, 1963, XIII (1). [p.11, Fig.1].
Probability of occurrence of Calanus ( = Mesocalanus) tenuicornis in different environments.
T: Tropical waters (above 36.00 p.1000 salinity and above 20°C temperature); SST: Surface subtropical waters (salinity around 36 p.1000 and temperature 18°C or less); DST: Deeper shelf waters (salinity between 34 and 36, temperature under 20°C p.1000); SS: Surface shelf waters (same salinity and temperature above 20°C);
C: coastal waters with low salinity and variable temperature.

In each column no shading means no probability of finding the species in the samples from this environment; horizontal shading indicates the probability of finding the sepecies in percentages less than one in samples from this environment; cross shading indicates the probability of finding it in percentages higher than one and black shading represents the probability of finding it in the largest percentages of the total number of copepods.

Nota: For Björnberg, this species appeared only sparingly in the samples belonging to southern waters off Brazil with larger frequency in surface subtropical and in greater numbers in deeper shelf waters. It can be classified as an eurythermic cryophile prefering the lower end of the temperature range for warm waters.
Species Mesocalanus tenuicornis - Distribution map 5issued from : G.A. Rebstock in Global change Biology, 2002, 8. [p.77, Fig.2 u].
Climatic regime shifts and decadal-scale variability in calanoid copepod populations off southern California (31°-35°N, 117°-122°W.
Cumulative sums of nonseasonal anomalies from the long-term means of copepod abundance from years 1950 to 2000.
A negative slope indicates a period of below-average anomalies; a positive slope indicates a period of above-average anomalies. Abrupt changes in slope indicate step changes.
The October 1966 cruise (prior to the increase in sampling depth), March 1976 cruise (prior to the 1976-77 climatic regime shift), and October 1988 cruise (prior to the hypothesized 1989 climatic regime shift) are marked with vertical lines.
Species Mesocalanus tenuicornis - Distribution map 6issued from : A.A. Shmeleva in Bull. Inst. Oceanogr., Monaco, 1965, 65 (n°1351). [Table 6: 1]. As Calanus tenuicornis (from South Adriatic).
Dimensions, volume and Weight wet. Means for 50-60 specimens. Volume and weight calculated by geometrical method. Assumed that the specific gravity of the Copepod body is equal to 1, then the volume will correspond to the weight.
Loc:
Cosmopolite: (sub-Antarct.: SW & SE Pacif., sub-Arct.: rare), mainly tropical and temperate): South Africa (E & W), Atlant., Brazil, Caribbean Colombia, Caribbean Sea, Belize, Yucatan, G. of Mexico, off Cape Hatteras, Sargasso Sea, off E Cape Cod, off E Nova Scotia, Flemish Cape, North Sea, G. of Guinea, Canary Is., Morocco-Mauritania, Ibero-moroccan Bay, Portugal, off Coruña, off Gijon, Bay of Biscay, off Ireland (N & SW), Medit. (Alboran Sea, Sidi Fredj coast, Baleares, Banyuls, Ligurian Sea, Tyrrhenian Sea, G. of Napoli, Strait of Messina, Taranto, Adriatic Sea, Ionian Sea, Aegean Sea, Thracian Sea, Lebanon Basin, W Egyptian coast, Alexandria, Black Sea), G. of Aqaba, off Sharm El-Sheikh, Red Sea, Arabian Sea, Natal, Madagascar, Rodrigues Is., Indian, Bay of Bengal, Indonesia-Malaysia, SW Celebes, Pacif. (W equatorial), China Seas (East Yellow Sea, China Sea, South China Sea), Taiwan, Kuroshio Current, Okinawa, Yellow Sea, Korea, Korea Strait, Tsushima Straits, Japon (Ishikari Bay, Kuchinoerabu Is., E, NE), Honshu (Toyama Bay) off S Shikoku Is., off N Hawaii, G. of Alaska (Columbia Bay), British Columbia, Hecate Strait, Vancouver Is., off Washington coast, Oregon (Yaquina, off Newport), California, Santa Monica Basin, W Baja California, G. of California, Pacific (central: N and S gyres), Clipperton Is., W Costa Rica, Bahia Cupica (Colombia), Peru, Chile (S, off Valparaiso, off Santiago), S Pacif. (NPFZ), New Zealand (Kaikoura, SE North Island)
N: 279
Lg.:
(22) F: 1,8; M: 1,8-1,5; (34) F: 1,84-1,78; (35) [N-Z] F: 2,1-1,8; (38) F: 2,18-2,12; (47) F: 2,5-1,9; M: 1,95-1,85; (72) F: 2,22-1,68; M: 1,88; (101) F: 1,87-1,68; M: 1,8; 1,56; (104) F: 2; (116) F: 2,32; M: 2,2; (125) F: 2,1-1,99; M: 1,77; (131) F: 2,05-1,54; M: 1,87-1,51; (142) F: 2-1,8; M: 1,8-1,5; (180) F: 2,06-1,65; M: 1,8-1,72; (187) F: 2,2-2,06; (196) F: 3,4-2; M: 1,9-1,7; (199) F: 2,13-1,52; M: 1,75-1,44; (237) F: 2,0; M: 1,85-1,6; (290) F: 2,05-2; M: 1,9-1,8; (327) M: 1,84; (330) F: 2,39-1,64; M: 2,02-1,71; (432) F: 2,5-2; (449) F: 2,5-1,9; M: 1,95-1,85; (786) F: 2,19-2,13; M: 2,12-1,81; (866) F: 1,5-2,2; M: 1,5-2; (920) F: 2,02 ± 0,017; (927) F: 2,05-2,08 [winter]; 1,95-1,99 [Fall]; (991) F: 1,8-2,5; M: 1,5-2,2; (1023) F: 1,76-1,89; M: 1,63-1,76; (1137) F: 2,26-1,85; M: 2,09-1,95; {F: 1,50-3,40; M: 1,50-2,20}

Chiba S. & al., 2015 (p.971, Table 1: Total length female (June-July) = 2.5 mm [optimal SST (°C) = 16.7]
Rem.: epi- to bathypelagic.
Sampling depth (sub-Antarct.) : 0-50 m. In vertical tow 4000-3000 m (Harding, 1974: Rem.: possible contaminant species from higher up the water column).
For Marshall & Orr (1972, p.8) the size is small (1.5-1.8 mm). A1 is one and half times the length of the whole body. There are no teeth on the inner margin of the coxa in P5. In the female the genital segment is much produced ventrally.

After Ehrhardt (1967, p.888, 893) the species is found in the southwest Tyrrhenian Sea in water salinity between 37.09-38.04 p.1000 (mainly between 37.84- 38.04) and for the Oxygen between 4.45-6.40 cm3/l (mainly between 5.29-5.66).
Plentiful references, in general under the denomination of Calanus tenuicornis, more seldom Neocalanus tenuicornis.
See remarks in M. lighti.
After Benedetti & al. (2018, p.1, Fig.2) this species belonging to the functional group 3 corresponding to large filter feeding herbivorous.

See in DVP Conway & al., 2003 (version 1)
R. Stephen, 2007 : Data sheets of NIO, Kochi, India (on line).
Last update : 29/10/2020
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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 June 12, 2021]

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