Tortanus (Tortanus) gracilis - Fiche d'espèce - Copépodes planctoniques marins

Tortanus (Tortanus) gracilis Brady, 1883 (F,M)

Taxonomy

Ordre Calanoida

détails

Superfamille Diaptomoidea

détails

Famille Tortanidae

détails

Genre Tortanus

détails liste des espèces pour ce genre

Sub-Genus Tortanus

details

Abréviations ou symboles

Synonymie

Corynura gracilis Brady, 1883 (p.71, figs.F,M); Giesbrecht, 1892 (p.71, 525); Wolfenden, 1911 (p.364)

Références

Liste des auteurs étudiés

Giesbrecht & Schmeil, 1898 (p.158); Wolfenden, 1905 (1906) (p.1026, Rem.); A. Scott, 1909 (p.190, Rem.); Früchtl, 1924 b (p.64); Sewell, 1912 (p.354, 377: Rem.); 1914 a (p.248, Rem.F,M, fig.M); Steuer, 1926 a (p.58, figs.F,M, chart); Sewell, 1932 (p.398); Farran, 1936 a (p.122); Krishnaswamy, 1953 (p.140, fig.F); Kasturirangan, 1963 (p.66, figs.F,M); Chen & Zhang, 1965 (p.117, figs.F,M); Saraswathy, 1966 (1967) (p.85); Zheng & al., 1982 [p.95, Figs.F); Ohtsuka, 1992 a (p.265); Chihara & Omori, 1997 (p.924, Pl.186: F,M); Ohtsuka & Reid, 1998 (p.782, 796: figs.M); Bradford-Grieve & al., 1999 (p.886, 963, figs.F,M); Conway & al., 2003 (p.142, figs.F,M, Rem.); Mulyadi, 2004 (p.167, figs.F, Rem.); Phukham, 2008 (p.110, figs.F); Blanco-Bercial & al., 2011 (p.103, Table 1, Biol. mol, phylogeny)

Figures

Planche 1 issued from: Q.-c Chen & S.-z. Zhang in Studia Marina Sinica, 1965, 7. [Pl.52, 9-11].
Female (from E China Sea): 9, habitus (dorsal); 10, P5 (posterior).

Male: 11, habitus (dorsal)

Species Tortanus (Tortanus) gracilis - Planche 2 of morphological figures

Planche 2 issued from: Q.-c Chen & S.-z. Zhang in Studia Marina Sinica, 1965, 7. [Pl.53, 1].
Male: 1, P5 (posterior).

Species Tortanus (Tortanus) gracilis - Planche 3 of morphological figures

Planche 3 issued from : S. Ohtsuka & J.W. Reid in J. Crustacean Biol., 1998, 18 (4). [p.796, Fig.11, C-D].
Male: C, P5 of 5th copepodid stage; D, P5 of adult.
Scale bar in mm.
Nota: Note newly formed P5 of adult stage within preceding stage (thick dotted line in C). Arrows in C and D indicate a presumed homologous seta.
The structure of the adult male P5 of Tortanus, in particular the right leg, has not been clearly understood. Giesbrecht (1892) thought that the right leg was composed of a coxa, basis, and 2-segmented exopod (the exopod forming a chela). Through observations of the 5th copepodid stages of males of several species, we have concluded that this system is incorrect.
The most important tool to trace the homology of segments and elements through development is to examine the newly formed appendage under the cuticle of the preceding stage (see in Hulsemann, 1991, p.105). The 2nd segments of the adult male P5, with an outer (or posterior) seta on each side, are referred to as the basis. Both coxae and the intercoxal sclerite are completely fused to form a common base in the 5th and adult stages. The segment (s) distal to the basis were called the exopod (Giesbrecht,1892; and others) or endopod (Bowman, 1971). Presumably the process on the right basis of the 5th copepodid stages of T. discaudatus and T. derjugini corresponds to the vestigial endopod.

Species Tortanus (Tortanus) gracilis - Planche 4 of morphological figures

Planche 4 Issued from : R.B.S. Sewell in Spolia Zeylanica, 1914, 9. [Pl.XXI, Fig.5].
Male (from Gulf of Mannar): P5.
Nota: Right A1 16-segmented (segments 1-5, 19-21, and 22-25 fused). Proportional lengths of urosomites and furca as 14:14:11:8:15:72.

Sewell points to the characteristics female following: A1 17-segmented (segments 1-7, and 13-14, apparently fused. P5 asymmetrical, but the degree of asymmetry is very slight (not comparable to that in T. forcipatus.

Planche 5 issued from : Z. Zheng, S. Li, S.J. Li & B. Chen in Marine planktonic copepods in Chinese waters. Shanghai Sc. Techn. Press, 1982 [p.95, Fig.55].
Female: a, habitus (dorsal); b, urosome (lateral); c, idem (ventral); d, P1; e, P5.
Scale bar in mm.

Species Tortanus (Tortanus) gracilis - Planche 6 of morphological figures

Planche 6 Issued from : G.S. Brady in Rep. Scient. Results Voy. Challenger, Zool., 1883, 8 (23). [Pl.XXXIII]. As Corynura gracilis.
Female: 2, habitus (lateral); 3, A1; 5, A2; 6, Md; 7, Mx1; 8, Mx2; 9, Mxp; 10, one of the swimming leg; 12, P5; 13, urosome; 14, same (lateral).

Male: 1, habitus (ventral); 4, denticulated portion of right A1; 11, P5.

Species Tortanus (Tortanus) gracilis - Planche 7 of morphological figures

Planche 7 issued from : N. Phukham in Species diversity of calanoid copepods in Thai waters, Andaman Sea (Master of Science, Univ. Bangkok). 2008. [p.193, Fig.67].
Female (from W Malay Peninsula): a-b, habitus (dorsal and lateral, respectively); c, P5.

Body length after the drawing: F = 1.882 mm.

Species Tortanus (Tortanus) gracilis - Planche 8 of morphological figures

Planche 8 issued from : Mulyadi in Published by Res. Center Biol., Indonesia Inst. Sci. Bogor, 2004. [p.168, Fig.93].
Female (from 06°10'S, 106°00'E): a, habitus (dorsal); b, last thoracic segment and urosome (dorsal); c, psterior region of urosome (dorsal); d, P5.

Références complémentaires

Liste des auteurs étudiés

Gurney, 1927 (p.158); Sewell, 1948 (p.324); C.B. Wilson, 1950 (p.346); Wickstead, 1959 (p.69, Rem.: p.72); Wickstead, 1962 (p.546, food & feeding); Ganapati & Shanthakumari, 1962 (p.9, 16); Delalo, 1968 (p.138); Patel, 1975 (p.660); Ikeda, 1977 d (p.263, feeding); Chen Q-c, 1980 (p.795); Skjoldal, 1981 (p.119, adenylate energy); Chen Q., 1983 (p.133); Binet, 1984 (tab.3); 1985 (p.85, tab.3); Madhupratap & Haridas, 1986 (p.105, tab.1); Sarkar & al., 1986 (p.178); Othman & al., 1990 (p.561, 564, Table 1); Mitra & al., 1990 (fig.3); Dai & al., 1991 (tab.1); Shih & Young, 1995 (p.74); Ramaiah & Nair, 1997 (tab.1); Mauchline, 1998 (tab.8); Wong & al, 1998 (tab.2); El-Serehy & al., 2001 (p.116, Table 1: abundance vs transect in Suez Canal); Rezai & al., 2004 (p.490, tab.2); Dur & al., 2007 (p.197, Table IV); Ohtsuka & al., 2008 (p.115, Table 4, 5, Rem.: in Tamashima Harbor and Dokai Bay); Tseng L.-C. & al., 2008 (p.153, Table 2, occurrence vs geographic distribution); Tseng L.-C. & al., 2008 (p.46, table 2, abundance vs moonsons, table 3: indicator species); Rakhesh & al., 2008 (p.154, Table 5: abundance vs stations); Cornils & al., 2010 (p.2076, Table 3); Maiphae & Sa-ardrit, 2011 (p.641, Table 2, 3, Rem.); Saitoh & al., 2011 (p.85, Table 5); Rakhesh & al., 2013 (p.7, Table 1, abundance vs stations); Jagadeesan & al., 2013 (p.27, Table 3, seasonal variation); El-Serehy & al., 2013 (p.2099, Rem.: p.2101); Nakajima & al., 2015 (p.19, Table 3: abundance); Ohtsuka & Nishida, 2017 (p.565, Table 22.1);

Distribution

NZ: 8

Carte de distribution de Tortanus (Tortanus) gracilis par zones géographiques

Distribution map of Tortanus (Tortanus) gracilis for the Zone Indian Ocean

Distribution map of Tortanus (Tortanus) gracilis for the Zone China Seas, Vietnam

Localisations

Glossaire géographique

off Ascension Is. (in Wolfenden,1911), Gulf of Suez, Suez Canal, Red Sea, Madagascar (Nosy Bé), Seychelles, Indian, India (Saurashtra coast, Bombay, Lawson's Bay, Madras, Gulf of Mannar, Plak Bay, Mandarmani, Godavari region, Kakinada Bay, Hooghly estuary), W Malay Peninsula (Andaman Sea), Straits of Malacca, G. of Thailand, off Sigapore, Indonesia-Malaysia, W Java (off Labuan), Tioman Is., SW Celebes, Philippines, Hong Kong, China Seas (Yellow Sea, East China Sea, South China Sea, Xiamen Harbour), Taiwan, Japan (Honshu: Seto Inland Sea), Palau Is., Australia (G. of Carpentaria, Great Barrier, Townsville: inshore waters), New Caledonia, Gilbert Is.

Citations

N: 66

Dimensions (mm)

Références de auteurs concernant les dimensions

(5) F: 1,68-1,52; (34) F: 2,07-1,7; M: 1,5-1,44; (78) F: 1,8-1,6; M: 1,8-1,6; (135) ? F: 2,1; (290) F: 1,8-1,75; M: 1,4-1,35; (334) F: 1,8-1,6; M: 1,5; (530) F: 1,8; M: 1,5; (638) F: 1,64; (762) F: 1,8-1,61; M: 1,4-1,35; (795) F: 1,9; M: 1,4; (991) F: 1,52-2,1; M: 1,5; (1023) F: 1,61-1,71; (1122) F: 1,55; {F: 1,52-2,10; M: 1,35-1,80}

Remarques

néritique, épipélagique.

Voir aussi les remarques en anglais

Dernière mise à jour : 17/04/2020