Oithona decipiens - Species Card - Marine Planktonic Copepods

Oithona decipiens Farran, 1913 (F)

Taxonomy

Order Cyclopoida

details

Family Oithonidae

details

Genus Oithona

details list species for this Genus

Abbreviations or symbols

Synonymy

References

List of the studied authors

Farran, 1913 a (p.184, Descr.F, figs.F); Rosendorn, 1917 a (p.26, Rem.F); Kiefer, 1929 g (p.7, Rem.F); Mori, 1937 (1964) (p.111, figs.F); Sewell, 1948 (p.430); Lindberg, 1955 a (p.464: Rem.); Chiba & al., 1957 (p.310); 1957 a (p.12); Wellershaus, 1970 (p.483: Rem.F); Kos, 1972 (Vol.I,figs.F, Rem.); Chen & al., 1974 (p.32, figs.F, p.74: Rem., Tab.1); Nishida & al., 1977 (p.133, figs.F, Rem.); Shuvalov, 1980 (p.119, figs.F); Ferrari & Bowman, 1980 (p.10, figs.F); Nishida, 1985 a (p.38, Redescr., figs.F, p.128); 1986 (p.386); Yoo & Lim, 1993 (p.91, 94, 98, Table 1); Kim & al., 1993 (p.271); Chihara & Murano, 1997 (p.937, Pl.194: F); Avancini & al., 2006 (p.121, Pl. 89, figs.F, Rem.); Vives & Shmeleva, 2010 (p.56, figs.F, Rem.)

Figures

Plate 1 issued from : F.D. Ferrari & T.E. Bowman in Smiths. Contr. Zool., 1980, 312. [p.10, Fig.5].
Female (from Caribbean area): a, urosome (lateral left side); b, P4.
Nota: Knob near genital opening armed with a single, thick, curved spine, toothed on posterior edge. Endopodal segment 2 of P4 both setae modified, slightly curved, distal thicker than proximal, with more well-developed flange on distal 1/4. endopodal esgment 3 of P4 proximal setae thickened with flange on distal 193. Nishida & al (1977) report some specimens with 0-0-1 outer setae on exopodal segments of P4 (Ferrari and Bowman agree with Kiefer (1936) that variation in spine number is important in separating species, a more extensive survey of the Sagami Bay should be made in order to resolve this reported variation).

Species Oithona decipiens - Plate 2 of morphological figures

Plate 2 Issued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.39, Fig.17].
Female: a, habitus (dorsal); b, forehead (lateral); c, last thoracic segment 5 and genital segment (dorsal); d, anal segment and caudal rami (dorsal); e, Md (biting edge); f, Mx1; g, P1; h, P2; i, P3; j, P4.

Nota: Mx1: inner lobe 1 with 3 thick distal marginal setae about equal in length; outer lobe 2 with 1 seta, ; inner lobe 2 without seta, inner lobe 3 with 1 thick spinulose seta, 1 longer seta and 1 fine short seta; basipodal segment 2 rudimentary, without seta; endopodite small oval without seta; exopodite with 3 setae.
Proportional lengths of urosome segments and caudal ramus 13:34:15: 13:13:12.

Nota after C.R.: Setal formula on outer margin (in first) and inner margin (in second) of exopod segments (from proximal to distal) of P1 to P4:
P1: 1, *, 2; 0, 1, 4.
P2: 1, 1, 2; 0, 1, 5
P3: 1, *, 1; 0, 1, 5.
P4: 0, 0, *; 0, 1, 5.
* = very tiny spine.

Species Oithona decipiens - Plate 3 of morphological figures

Plate 3 Issued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.40, Fig.18].
Female: a, A1; b, A2; c, Md; d, Mx2; e, Mxp.
Nota: Basipodal segment 2 of Md with 2 strong, slightly curved, spinulose subequal spines on distal end, and 1 seta about middle of inner margin; endopodite small with 3 or 4 setae.

Species Oithona decipiens - Plate 4 of morphological figures

Plate 4 issued from : Q.-c Chen & S.-z. Zhang & C.-s. Zhu in Studia Marina Sinica, 1974, 9. [Pl.1, Figs.1-5].
Female (from China Seas): 1, habitus (dorsal); 2, P1; 3, P2; 4, P3; 5, P4.

Nota: Farran (1913) described that the exopod 2 of female P1 is without an inner seta and the exopod 3 of female P4 is without an outer spine, but the specmens here agree well with the Rosendorn's (1917) description.

Species Oithona decipiens - Plate 5 of morphological figures

Plate 5 issued from : G.P. Farran in Proc. zool. Soc. Lond., 1913. [Plate XXVIII, Figs.4-11].
Female (from Christmas Island, Indian): 4, forehead (lateral); 5, Md (mandibular palp); 6, Mx1; 7, habitus (dorsal); 8-11, P1 to P4.

Species Oithona decipiens - Plate 6 of morphological figures

Plate 6 issued from : T. Mori in The Pelagic copepoda from the neighbouring waters of Japan, 1937 (1964). [Pl. 61, Figs.9-14].
Female: 9, habitus (dorsal); 10, P2; 11, P1; 12, P3; 13, Md; 14, P4.

Species Oithona decipiens - Plate 7 of morphological figures

Plate 7 issued from : V.S. Shuvalov in Opred. Faune SSSR, Nauka, Leningrad, 1980, 125. [p.120, Fig.26].
Female: 1, prosome (dorsal); 2, 18, thoracic segments 4 and 5, abdomen (dorsal and lateral, respectively); 3, posterior part of urosome (dorsal); 4, habitus (dorsal); 5-6, forehead (lateral and dorsal, respectively); 7, prosome (lateral); 8, A2; 9, Mx2; 10, Mxp; 11, P2; 12, P2 (segments 2 and 3 of exopod); 13, P3; 14, P3 (distal segment of exopod); 15, P4; 16, P4 (distal segment of exopod); 17, thoracic segment 5 and genital segment.

Species Oithona decipiens - Plate 8 of morphological figures

Plate 8 Issued from : S. Nishida, O. Tanaka & M. Omori in Bull. Plankton Soc. Japan, 1977, 24 (2). [p.134, Fig.7].
Female (from Suruga Bay and adjacent waters): a, habitus (dorsal), b, forehead (lateral); c, Md; d, Mx1; e, P1; f, P2; g, P3; h, P4.

Nota: Setae formula of exopod P1 to P4 (outer setae in first, inner setae in second). P1: 1,02; 0,1,4. P2: 1,1,2; 0,1,5. P3: 1,0,1; 0,1,5. P4: 0,0,0 (or 1); 0,1,5.
Exopodite 3 of P3 with 1 tooth on the outer margin.
Prosome length/urosome length = 1.16-1.28.

Plate 9 Issued from K.-I. & D.-H. Lim in The Korean J. Syst. Zool., 1993, 9 (2). [Key of female]: ]Morphological characters of Oithona decipiens female in Korean waters :
1 - Anterior part of prosome rounded in dorsal view.
2 - Rostrum pointed ventrally.
3 - Length of A1 longer than that of prosome.
4 - Exopod 2nd segment of P1 without spine.

Complementary References

List of the studied authors

Yamazi, 1958 (p.153, Rem.); V.N. Greze, 1963 a (tabl.2); Shmeleva, 1964 a (p.1068); Pavlova, 1966 (p.44); Delalo, 1968 (p.138); Kovalev & Shmeleva, 1982 (p.85); Guangshan & Honglin, 1984 (p.118, tab.); Greze & al., 1985 (p.8); Yoo, 1991 (tab.1); Shih & Young, 1995 (p.74); Hure & Krsinic, 1998 (p.103); Suarez-Morales & Gasca, 1998 a (p.111); Ueda & al., 2000 (tab.1); Hsieh & al., 2004 (p.398, tab.1); Mazzocchi & al., 2005 (p.155); Prusova & Smith, 2005 (p.76); Shmeleva & al., 2008 (p.31, Table 1); Hernandez-Trujillo & al., 2010 (p.913, Table 2); Mazzocchi & Di Capua, 2010 (p.428); Selifonova, 2011 a (p.77, Table 1, alien species in Black Sea); Mazzocchi & al., 2011 (p.1163, fig.6, long-term time-series 1984-2006); Mazzocchi & al., 2012 (p.135, annual abundance 1984-2006); Uysal & Shmeleva, 2012 (p.909, Table I); Johan & al., 2012 (2013) (p.1, Table 1); Gubanova & al., 2013 (in press, p.4, Table 2); in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, comm. pers.); Tachibana & al., 2013 (p.545, Table 1, seasonal change 2006-2008); Mazzocchi & al., 2014 (p.64, Table 4, 5, abundance); Benedetti & al., 2016 (p.159, Table I, fig.1, functional characters); Benedetti & al., 2018 (p.1, Fig.2: ecological functional group); Palomares-Garcia & al., 2018 (p.178, Table 1: occurrence)

Distribution

NZ: 11

Distribution map of Oithona decipiens by geographical zones

Distribution map of Oithona decipiens for the Zone Mediterranean Sea, Black Sea

Distribution map of Oithona decipiens for the Zone Indian Ocean

Distribution map of Oithona decipiens for the Zone China Seas, Vietnam

Additional Maps & Charts

Species Oithona decipiens - Distribution map 5

Map 5 Issued from : S. Nishida in Bull. Ocean Res. Inst., Univ. Tokyo, 1985, No 20. [p.128, Fig.76].
Indo-Pacific geographical distribution of Oithona decipiens. Dotted line: AC, Arctic Convergence; SC, Subtropical Convergence.

Localisations

Geographical glossary

Venezuela, Ibero-moroccan Bay, Medit. (Alboran Sea, Ligurian Sea, G. of Napoli, Adriatic Sea, Ionian Sea, Aegean Sea, Lebanon Basin, W Black Sea: Black River estuary), Red Sea, Arabian Sea, Indian, Malaysia (Sarawak: Bintulu coast), Philippines, China Seas (Yellow Sea, East China Sea, South China Sea), W & S Taiwan, S & E Korea, Japan, Tanabe Bay, Tokyo Bay, Pacif. (W equatorial), Pacif. (equatorial, tropical), W Baja California (Bahia Magdalena, La Paz), SE Pacif.

Quotations

N: 48

Dimensions (mm)

References of the authors concerning dimensions

(91) F: ± 0,75; (109) F: 0,67-0,55; (155) F: 0,67-0,64; (624) F: 0,72-0,6; (627) F: 0,81-0,61; (634) F: 0,62-0,56; (649) F: 0,59; (880) F: 0,56-0,75; (1230) F: 0,56-0,75; (1239) F: 0,68-0,75; {F: 0,55-0,81}

Remarks

epi-mesopelagic.
Characters female after Rosendorn (1917 a, p.26): Proportion of lengths (p.cent) Prosome : 55.17, Urosome : 44.83 . Relative lengths of urosomal segments and caudal rami: 6: 17: 7: 6.5: 7: 6 : 9 : 30 : 15 : 14 : 12 : 12. Setal formula of the exopod swimming legs P1 to P4 (Se = outer setae ; Si = inner setae), P1 : 1, 0, 2 Se ; 0, 1, 4 Si ; P2 : 1, 1, 2 Se ; 0, 1, 5 Si ; P3 : 1, 0, 1 Se ; 0, 1, 5 Si ; P4 : 0, 0, 1 Se ; 0, 1, 5 Si .

After Benedetti & al. (2018, p.1, Fig.2) this species belonging to the functional group 6 corresponding to small ambush feeding omnivorous.
Ater Yoo & Lim (1993, p.96) the discrimination between this species and Oithona similis on the basis of external morphology is very difficulty. But the number of marginal spine in P21-P4 exipod of O. decipiens is different from that of O. similis. For O. decipiens the formula is 1-0-2; 1-1-2; 1-0-1; 0-0-0, wherea O. similis has 1-1-2; 1-0-1; 1-0-1; 0-0-1.

Last update : 19/06/2023

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