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Calanoida ( Order ) |
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Clausocalanoidea ( Superfamily ) |
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Aetideidae ( Family ) |
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Euchirella ( Genus ) |
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Euchirella formosa Vervoort, 1949 (F,M) | |
| | | | | | | Syn.: | Euchirella trigrada Tanaka, 1957 b (p.184, figs.F);
E. orientalis : Tanaka & Omori, 1969 (p.52, figs.F,M) | | | | Ref.: | | | Vervoort, 1949 (p.29, Descr.F, figs.F); 1963 b (p.134: Rem.); Morris, 1970 (p.2300, 2304, figs.F); Bradford & Jillett, 1980 (p.35, figs.F, Rem, fig. 73, distribution chart); Vaupel Klein, 1984 a (p.38, Table II: characters, Rem.); Markhaseva, 1996 (p.154, figs.F, M); Bradford-Grieve & al., 1999 (p.879, 921, figs.F,M) |  issued from : Tanaka O. in Publ. Seto mar. Biol., Lab., 1957, 6 (2). [Fig.49, p.185]. As Euchirella trigrada. Female from Suruga): habitus (dorsal aspect); b, head (lateral aspect); c, last thoracic segment and urosome (lateral view, left side); d, A2;: e, Mxp.; f, P1; g, outer margin of exopodite of P2; h, inner margin of basal joints of P4. Nota Female: - Cephalothorax about 4.83 the abdomen length. - Head and 1st pediger segmant separate, 4th and 5th thoracic segments fused. - Rostrum directs straight forwards , rostral spine moderately long.. - Abdomen 4-segmented; segments and caudal rami in the proportional lengths 60 : 20 : 8 : 6 : 16 = 100. - Gental segment which is as deep as wide is shorter than wide; segment in dorsal view slightly asymmetrical; there are on the left side 3 lamellous proeesses of which the distal 2 are broad at the base; there is a blunt process on the right side; genital area as that of E. truncata. - Caudal rami shorter than wide. - A1 23-segmented, reaches back to distal end of caudal rami. - A2 exopod about 3.7 times as long as endopod; 1st basal segment with a tuft of hairs on the posterior surface. - Mx1 as that of E. messinensis; 2nd basal segment with 3 setae; endopod with 4 setae; exopod with 11 setae.Mx2 as that of E. rostrata. - Mxp with sinuate anterior margin on 2nd basal segment. - P2 with strong outer edge spines on exopodal segments. - Terminal spines of exopod of P2 to P4 with each 20 teeth. - P4 with 2 subequal spines on posterior surface of coxa.
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 issued from : E.L. Markhaseva in Proc. Zool. Inst. RAN, St. Petersburg, 1996, 268. [p.155, Fig.117]. Female (specimen from Kuril). P.md: mandibular palp; Ce: forehead (lateral).
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 issued from : J.M. Bradford & J.B. Jillett in Mem. N.Z. Oceanogr. Inst., 86, 1980. [p.37, Fig.22]. Female: A, habitus (lateral right side); B, idem (dorsal); C, genital segment (lateral left side); D, basipod 1 of P4.
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 Issued from : W. Vervoort in Zool. Verh., Leiden, 1949, 5. [p. 30, Fig.14]. Female (from Timor Sea): a, habitus (dorsal); b, forehead (lateral); c, urosome (dorsal). Nota: A1 (24-free segments) reaches the distal margin of the 1st urosomal segment.The abdominal segments and furca in the proportional lengths 55:10:11:10:14 = 100.
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 Issued from : W. Vervoort in Zool. Verh., Leiden, 1949, 5. [p. 31, Fig.15]. Female (from Timor Sea): a,urosome (lateral right side); b, idem (lateral left side); c, P1; d, basal portion of P4, showing the spines of the 1st basal segment.
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 issued from : J.C. von Vaupel Klein in Crustaceana, Supplt 9, Studies on Copepoda, III, 1984. [p.74, Fig.12, a, g]. Female: a, setal armature of exopod of Mx1 (left one in posterior aspect; all setae are plumose as shown in one). Nota: 11 setae, the wide-spread condition in the other genera and in most Euchirella spp.; g, spinules on the distal margin of the 5th endite of Mx2 basipod (left appendage in postero-medial aspect).
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 issued from : O. Tanaka & M. Omori in Publ. Seto mar. Biol. Lab., 1969, XVII, 1. [p.53, Fig.7]. As Euchirella orientalis. Female (from Izu Region, Japan): a, forehead (lateral); b-c, last thoracic segment and urosome (lateral and dorsal, respectively). Male: d, forehead (lateral); e, Mx1; f, P1; g, P5; h, left P5 (distal segment of exopod; i, idem (another specimen).
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 issued from : J.C. von Vaupel Klein in Crustaceana, Supplt 9, Studies on Copepoda, III, 1984. [p.82, Fig.17, j]. Female:terminal part of basipodal segment 2 and endopod of right Mxp (medial view). Scale bar 0.2 mm. Nota: Compare grossly enlarged endopodal segment 2 in Undeuchaeta as opposed to the regular condition found in (see fig.17, i in U. incisa).
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 issued from : J.C. von Vaupel Klein in Crustaceana, Supplt 9, Studies on Copepoda, III, 1984. [p.80, Fig.16, x]. Female: o, arrangement of medial spines on the posterior face of basal segment 1 of right P4 . Scale bar 0.1 mm. Nota: 2 subequal stout spines on a common base, situated under a wider angle than E. pulchra and E. messinensis indica, but as also usually observed in E. slendens and E. venusta; both spines of E. messinensis indica and E. formosa are generally representative of the species, but individual variation in the angle between the two spines is not uncommon.
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 issued from : B. Morris in J. Fish. Res. Bd Canada, 1970, 27 (12). [p.2305, Fig.3]. Female (from N Pacif. sbutropical): A, forehead (lateral); B, urosome (lateral); C, same (dorsal); D, right A1; E, A2; F, Md (madibular palp); G, Mx1; H, Mx2; I, Mxp; J, P1 (anterior); K, basipodite 1 of P4 (posterior).
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 Euchirella formosa female: 1 - Genital segment asymmetrical. 2 - Crest absent. 3 - Genital segment with left lateral side swelled, right projection also present, smaller than the left one (dorsal view). 4 - Coxopodite of P4 with 2 spines. 5 - Endopodal segment 1 of Md without seta. 6 - Posterior part of dorsal side of genital segment with 3 projections (left lateral view).
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 Euchirella formosa male: 1 - P5 biramous, endopod of left leg rudimentary. Exopodal segment 2 and endopod of right leg elongated and shapened in their distal parts forming tongs. Endopod of right P5 significantly exceeding distal border of exopodal segment 1 of right leg. 2 - Crest present, low. 3 - Basipodite of left P5 nearly as long as right coxopodite of right P5. 4 - Parts of exopodal segment 3 of left P5 tongs not equal in length.
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 issued from : Tanaka O. in Publ. Seto mar. Biol., Lab., 1957, 6 (2). [p.185]. As Euchirella trigrada. Female A1: proportional lengths of segments. - A1 23-segmented, reaches back to distal end of caudal rami. - Segments 3, 7, 9, 14 and 18, each with a long seta; aesthetascs found on segments 9, 2, 14 and 19/
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 Issued from : J.C. von Vaupel Klein in Crustaceana, Supplt 9, Studies on Copepoda, III, 1984. [p.70, Fig.10, e]. Euchirella formosa: Setal armature on proximo-distal corner of basis, adjacent to the endopod of Mx1 (left appendage in postrior view; secondary structures on large setae are not shown, and neither are the hairs on the basis proper). The usual Euchirella condition of 1 long, stout seta plus 2 small and slender, densely plumose setae.
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 Issued from : J.C. von Vaupel Klein in Crustaceana, Supplt 9, Studies on Copepoda, III, 1984. [p.70, Fig.11, i]. Euchirella formosa: Setal armature of the endopod of Mx1 (detail of left appendage in posterior aspect; setules/spinules omitted). 4 well developed setae.
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 Issued from : J.C. von Vaupel Klein in Crustaceana, (Supplement) 9, 1984. [p.93, Table II]. Euchirella formosa Female: Datamatrix stating observed states of characters from Table I (p.87-90) presently examined; nos. refer to the input nos. used in Table I (see to the family Aetideidae).
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 Issued from : J.C. von Vaupel Klein in Crustaceana, (Supplement) 9, 1984. [p.94, Table II (cont' d)I]. Datamatrix stating observed states of characters from Table I (p.87-90) presently examined; nos. refer to the input nos. used in Table I (see to the family Aetideidae).
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 Issued from : J.C. von Vaupel Klein in Crustaceana, (Supplement) 9, 1984. [p.95, Table II (cont' d)]. Datamatrix stating observed states of characters from Table I (p.87-90) presently examined; nos. refer to the input nos. used in Table I (see to the family Aetideidae).
| | | | | Compl. Ref.: | | | De Decker & Mombeck, 1964 (p.12); Fleminger, 1967 a (tabl.1); Grice Hulsemann, 1967 (p.15); 1968 (tab.2); Björnberg, 1973 (p.324, 386); Galbraith, 2009 (pers. comm.); C.E. Morales & al., 2010 (p.158, Table 1); in CalCOFI regional list (MDO, Nov. 2013; M. Ohman, comm. pers.) | | | | NZ: | 10 | | |
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Distribution map of Euchirella formosa by geographical zones
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| | | | | |  Issued from : J.M. Bradford & J.B. Jillett in New Zealand Ocean. Inst. Memoir, 86, 1980. [p.88-89, Figs.65-67].
Distribution of several species of Euchirella in the Tasman Sea and around New Zealand.
Nota: Euchirella indica (= Euchirella massinensis indica). |
| | | | Loc: | | | E South Africa, S Brazil, E & SW Indian, Timor Sea, Strait of Macassar, off Philippines, Japan, Kuril-Kamchatka, Pacif. (central N), Vancouver Is., Pacif. (N central subtropical), New Zealand, California, off IJuan Fernandez Is., Chile (S, Concepcion).
Type locality: 10°49'S, 123°59'E. | | | | N: | 18 | | | | Lg.: | | | (37) F: 5,5-4,8; M: 5,2-4,75; (41) F: 5,2-5,1; (56) F: 5,23; (92) F: 5,38-4,75; (110) F: 5,25; M: 5,2-4,75; (201) F: 5,5-4,8; (1257) F: 5,1-5,75; {F: 4,75-5,50; M: 4,75-5,20}
The mean female size is 5.151 mm (n = 10; SD = 0.2837) and the mean male size is 4.975 mm (n = 4; SD = 0.2598). The size ratio (male : female) is 0.96. | | | | Rem.: | epiplagic.
According to Vervoort (1949, p.32) the species resembles E. intermedia, but differs in the shape of the gental segment female.
Bradford & Jillett (1980, p.35) do not accept the synonymy of Tanaka & Omori (1969) between E. formosa and E. orientalis Sewell, 1947. | | | Last update : 19/06/2023 | |
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 Any use of this site for a publication will be mentioned with the following reference :
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 November 21, 2024] © copyright 2005-2024 Sorbonne University, CNRS
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