Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Aetideidae ( Family )
            Valdiviella ( Genus )
Valdiviella oligarthra  Steuer, 1904   (F,M)
Syn.: Euchaeta gigas Brady, 1883 (p.65);
Valdiviella gigas : Sewell, 1913 (p.354, figs.F); 1929 (p.142, Rem. juv.);
Valdiviella insignis : Heptner, 1971 (p.113, figs. juv.M);
No Valdiviella oligarthra M : Tanaka & Omori, 1967 (p.247)
Steuer, 1904 (p.593, Descr.F, figs.F); Wolfenden, 1911 (p.247, Rem.); Sewell, 1929 (p.140, figs.F,M); Lysholm & al., 1945 (p.21); Sewell, 1947 (p.110); Vervoort, 1957 (p.86, Rem.); Tanaka, 1957 b (p.205, figs.F; Tanaka & Omori, 1967 (p.244, non M); 1970 b (p.153); Park, 1978 (p.191, figs.F,M); Bradford & Jillett, 1980 (p.83); Chihara & Murano, 1997 (p.690, Pl.50: F,M); Bradford-Grieve & al., 1999 (p.880, 927, figs.F,M); Vives & Shmeleva, 2007 (p.609, figs.F,M, Rem.)
Species Valdiviella oligarthra - Plate 1 of morphological figuresissued from : Tanaka O. in Publ. Seto Mar. Biol. Lab., 1957, 6 (2). [Fig.61, p.206].
Female (from Suruga): a, habitus (dorsal aspect); b, head (lateral aspect, left side); c, last thoracic segment and urosome (lateral aspect); d, exopodite and endopodite of Mx1; e, Mxp.; f, P1; g, P2.

Nota Female:
- Cephalothorax about 2 times the abdomen length (6.38 : 3.19)
- Head and 1st pediger segment incompletely separate, 4th and 5th pedigers fused.
- Posterolateral corners of last thoracic segment rounded.
- Rostrum 2-pointed, shot.
- Abdome 4-segmented; segments and caudal rami in proportional lengths 40 : 23 : 19 : 8 : 10 = 100.
- Genital segment swollen ventrally; genital area indented in lateral view..
- 2nd and 3rd abdominal segments with a tuft of hairs ventrally near proximal margin.
- Abdominal segments 1 to 3 fringed with fine teeth on distal margin.
- Caudal rami as long as wide.
- A1 23-segmented, extends to distal end of 3rd thoracic segment.
- P1 exopod 2-segmented and endopod 1-segmented.
- P2 to P4 with each exopodite 2-segmented (segments 1 and 2 of exopodite fused.
- P2 endopod 1-segmented.
- P3 and P4 endopod 2-segmented.

Species Valdiviella oligarthra - Plate 2 of morphological figuresissued from : T. Park in Antarctic Res. Ser. Washington, 1978, 27. [p.192, Fig.59].
Female: A, habitys (dorsal view); B, posterior part of metasome and urosome (dorsal view); C, idem (left side); D, forehead (lateral); E, genital segment (ventral); F, rostrum (anterior); G, outer lobe of Mx1; H, P1; I, P2. P1-2: legs (anterior)

Species Valdiviella oligarthra - Plate 3 of morphological figuresissued from : T. Park in Antarctic Res. Ser. Washington, 1978, 27. [p.193, Fig.60].
Male: A, habitus (left side); B, forehead (lateral); C, last metasomal and genital segments (lateral); D, A2; E, P1; F, P2; G, P5; H, exopod and endopod of left P5, medial; I, first exopodal segment and endopod of right P5, medial. P1-5: legs (anterior).

Species Valdiviella oligarthra - Plate 4 of morphological figuresissued from : R.B.S. Sewell in Mem. Indian Mus., 1929, X. [p.141, Fig.54].
Female (from off SE Sri-Lanka): a, habitus (lateral left side).

Male: b, P5.
Nota: Md devoid of any biting edge; endopod with 6 setae; exopod with 9 setae, of which two very short, on its 2nd segment and none on its 1st. Mx1 much reduced; outer lobe with 11 setae of which the 11th ivery short; endopod with 3 setae. Mx2 vestigial; in the basal segment the first three lobes reduced to mere prominences devoid of setae; the 4th and 5th lobes with 2 setae each; endopod with 5 setae.

Species Valdiviella oligarthra - Plate 5 of morphological figuresissued from : M.V. Heptner in Trudy. Inst. Okeanol., 1971, 92. [p.114, Fig.19]; As Valdiviella insignis. Heptner thinks this form is a copepodid V female in the Kuril-Kamchatka Trench( (3800-7100 m). comm. pers..
Body length: 9 mm.

Species Valdiviella oligarthra - Plate 6 of morphological figuresissued from : A. Steuer in Zool. Anz., 1904, 27 (19. [p.595, Figs.1-3].
Female: 1, P1; 2, P2; 3, endopod of P4.

Nota: A1 23 segmented (segments 8 and 9 fused, 24 and 25 fused), lengt of segments in 0.01 mm: 27, 20,17,19,24, 21, 19, 23, 7, 7, 8, 13, 15, 21, 29, 34, 32, 37, 34, 26, 24, 26, 31.

Species Valdiviella oligarthra - Plate 7 of morphological figuresissued from : Tanaka O. in Publ. Seto Mar. Biol. Lab., 1957, 6 (2). [p.207].
Female A1: Proportional lengths of segments.
- A1 23-segmentrd; extends to distal end of 3rd thoracic segment.

Compl. Ref.:
Sewell, 1948 (p.331, 500, 516, 521, 527); Grice & Hulsemann, 1967 (p.15); 1968 (tab.2); Park, 1970 (p.476); Björnberg, 1973 (p.325, 389); Suarez-Morales & Gasca, 1998 a (p.109); Razouls & al., 2000 (p.343, Appendix); Park & Ferrari, 2009 (p.143, Table 4, Appendix 1, biogeography); Medellin-Mora & Navas S., 2010 (p.265, Tab. 2);
NZ: 11

Distribution map of Valdiviella oligarthra by geographical zones
Antarct. (SE Pacif.), sub-Antarct. (SW Atlant., SE Pacif.), South Africa, off E St. Paul Is., G. of Guinea, off NW Cape Verde Is., Canary Is., Atlant. (tropical, N temperate), Caribbean Sea, Caribbean Colombia, G. of Mexico, Arabian Sea, Laccadive Is., off Seychelles, W Indian, off E Sri Lanka, Bay of Bengal, Flores Sea, Japan (Izu), SE Pacif., off Juan Fernandez Is., Chile (N & S).
N: 15
(11) F: 10; (29) F: 7,2; M: 6,2; (56) F: 9,57; (70) F: 9,8-9,5; (112) F: 9,78-9,4; (866) M: 6,02-9,08; (1034) F: 9,0; {F: 7,20-10,00; M: 6,02-9,08}
Rem.: bathypelagic.
Sampling depth (Antarct., sub-Antarct.) : 0-2000 m.
The number of setae arising from the outer lobe of Mx1 is variable; Steuer gives 7, but that in some specimens the 1st and 2nd may be wanting; in Sewell (1947, p.110) the number is 7 setae.
For Vervoort (1957, p.86) the differences of this species and V. insignis Farran (1908) are extremely slight, so that both species could be regarded as growth classes or races of one species. Vervoort compares both species in the 'Snellius' collection (Eastern part of the Malay Archipelago):
V. oligarthra :
Female: 1- Total lengths 7.8 mm. 2- Postero-lateral thoracic border slightly produced, cut off obliquely. 3- Ventral surface of the 3rd abdominal somite with a patch of long hairs; no teeth along the dorsal part of distal border. 4- A1 reach 2nd thoracic somite. 5- Segmentation between the 1 st and 2 nd exopodal segments of P2 absent. 6- External marginal spine of the 1st exopodal segment of P2 reduced.
Male: 1- Total length 6.2 mm. 2- Endopods of P5 longer than in V. insignis. For structural differences in P5, cf. Sewell (1929, fig.54b)
Last update : 22/04/2021
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2024. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed July 14, 2024]

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