Species Card of Copepod
Cyclopoida ( Order )
    Oncaeidae ( Family )
        Triconia ( Genus )
Triconia giesbrechti  Böttger-Schnack, 1999   (F, M)
Syn.: "Oncaea dentipes form B" (females, non males) : Böttger-Schnack, 1994; 1995.
Ref.:
Böttger-Schnack, 1999 (p.43, 104, Descr.F, figs.F); Böttger-Schnack & al., 2001 (p.1029, tab.1); Böttger-Schnack & al., 2004 (p.1130, tab.1, Rem.); Wi & al., 2012 (p.852: Table 1); Cho & al., 2013 (p.24, Redescr.F, M, figs.F,M, Rem.)
Species Triconia giesbrechti - Plate 1 of morphological figuresissued from : R. Böttger-Schnack in Mitt. hamb. zool. Mus. Inst., 1999, 96 [p.105, Fig.31].
Female (from Red Sea): A, habitus (dorsal); B, idem (lateral left side); C, urosome (dorsal); D, idem (lateral left side); E, A1; F, caudal ramus (dprsal, longest terminal seta omitted); G, P5 (dorsal).
Nota: Proportional lengths (%) of urosomites and caudal rami 7.0:57.2:7.7:7.4:12.2:8.5. Relative lengths (%) of segments of A1 measured along posterior non-setigerous margin 6.4:20.4:45.2:12.9:3.8:11.3. Anal somite slightly wider than long, 1.4 times longer than caudal rami.


Species Triconia giesbrechti - Plate 2 of morphological figuresissued from : R. Böttger-Schnack in Mitt. hamb. zool. Mus. Inst., 1999, 96 [p.106, Fig.32].
Female: A, A2 (posterior); B, labrum (anterior); C, idem (posterior); D, Md (showing individual elements); E, Mx1; F, Mx2; G, Mxp.


Species Triconia giesbrechti - Plate 3 of morphological figuresissued from : R. Böttger-Schnack in Mitt. hamb. zool. Mus. Inst., 1999, 96 [p.108, Fig.33].
Female: A, P1 (posterior); B, P2 (anterior); C, P3 (posterior); D, P4 (anterior).


Species Triconia giesbrechti - Plate 4 of morphological figuresIssued from : K. Cho, W.-S. Kim, R. Böttger-Schnack & W. Lee in J. Nat. Hist., 2013. [p.27, Fig.11].
Female (10°30'N, 131°20'W): A, habitus (dorsal); B, habitus (lateral); C, urosome (dorsal; D, urosome (lateral); E, P6.
Scale bars in µm.

Nota : Exoskeleton heavily chitinized, entire surface covered with numerous deep pits as exemplified for genital double-somite (fig.13D, E).
Prosome 1.6 times length of urosome, excluding caudal rami, about 1.5 times urosome lenth including caudal rami.
P2-bearing somite without dorsoposterior projection in lateral aspect.
Integumental pores on prosome as indicated in fig.9A, B.
Pleural areas of P4-bearing somite with small pointed posterolateral corners.
Genital double-somite 1.7 times as long as maximum width (measured in dorsal aspect) and 1.9 times as long as postgenital somites combined, with oval-rounded form ; exoskeleton heavily chitinized (fig.13D, E), largest width measured at about 2/5 distance from anterior margin, lateral margins rounded, posterior part tapering gradually. Paired genital apertures located at about 2/5 distance from anterior margin of genital double-somite ; armed with 1 spine an a minute spinule (fig.9E and arrowed in fig.13C). Secretory pores on dorsal surface as in fig.9C.
Anal somite slightly wider than long, about 1.5 times longer than caudal rami.
Caudal ramus about 1.4 times as long as wide.
P5 with long plumose outer basal seta, about 2 times longer than outer exopodal seta, reaching far beyond genital apertures and extending as far as 4/5 the lengrh of genital double-somite (fig.9D, 13E). Exopod a free segment, about as long as wide0 bearing short spiniform seta and much longer slender seta, reaching as far as genital apertures ; both setae unornamented.
P6 armed with 1 long spine and 1 minute spinule (fig.9 E, 13C).


Species Triconia giesbrechti - Plate 5 of morphological figuresIssued from : K. Cho, W.-S. Kim, R. Böttger-Schnack & W. Lee in J. Nat. Hist., 2013. [p.26, Fig.10].
Female (NE equatorial Pacific): A, A1; B, A2 (posterior); C, Md; D, Mx1; E, Mx2; F, Mxp (anterior) and elements on inner margin of basis figured separately (insertion points of elements on basis indicated by stippled line); G, labrum (anterior); H, labrum (posterior).
Scale bars in µm.

Nota : A1 6-segmented. Armature formula as for T. pacifica.
A2 3-segmented, relative lengths (%) of segments about 41 : 34 : 25. Surface of coxobasis covered with numerous deep pits, as on entire exoskeleton. Prpximal endopodal segment with double row of denticles on posterior inner margin. Distal endopodal segment with armature and ornamentation as in T. pacifica, except for absence of spinular patch on anterior face of distal endopodal segment..
Labrum similar to that of T. pacifica, except for number of 5 stout and 3 small dentiform processes medially along distal margin of each lobe. Anterior surface (fig.10H) with group of 3 secretory pores located on proximal part of each lobe and 1 additional on midregion.
Md similar to that of T. pacifica.
Mx1 similar to T. pacifica, except for slight differences in proportional lengths of elements, with middle element on inner lobe shorter than outermost element and innermost element on outer lobe shorter than the strong element next to the innermost.
Mx2 similar to T. pacifica, except for seta on outer margin of allobasis not reaching as far as tip of allobasal claw.
Mxp with surface of syncoxa sparsely ornamented with spinules. Basis with armature and ornamentation as in T. pacifica, except for fewer spinules between proximal and distal setae.


Species Triconia giesbrechti - Plate 6 of morphological figuresIssued from : K. Cho, W.-S. Kim, R. Böttger-Schnack & W. Lee in J. Nat. Hist., 2013. [p.27, Fig.11].
Female (NE equatorial Pacific): A-D, P1 to Ps (anterior voews).
Scale bar in µm.


Species Triconia giesbrechti - Plate 7 of morphological figuresIssued from : K. Cho, W.-S. Kim, R. Böttger-Schnack & W. Lee in J. Nat. Hist., 2013. [p.28, Fig.12].
Male (10°30'N, 131°20'W): A, habitus (dorsal); B, A1; C, urosome (lateral); D, urosome (dorsal); E, urosome (ventral); F, P6, aberrant posterolateral cprner; G, Mxp (anterior); H, Mxp (medial view).
Scale bars in µm.

Nota : Caudal rami with length to width ratio as in female.
Surface of genital somite covered with numerous deep pits. Secretory pores on dorsal surface as in figure 12D. Surface ornamentation on genital flaps and on ventral surface of anal segment not fully discernede, probably as indicated in figure 12E.
A1 4-segmented ; armature formula as for T. pacifica.
Mxp 3-segmented. Syncoxa unarmed, single secretory pore on inner distal margin, other surface ornamentation not discernible. Basis robust, with 2 small naked setae within longitudinal cleft, proximal seta slightly longer than distal one ; anterior surface with 1 to 2 transverse spinular rows in addition to row of short glat spinules along inner margin, without zmall expanded flap ; posterior face with 3 or 3 longitudinal rows of spatuled setules of graduated length (fig.12H).
Swimming legs with armature and ornamentation as in female.
P5 small exopod not delimited from somite, armature and proportional lengths of exopodal setae as in female ; outer basal seta about 1.4 times longer than outer exopodal seta, relatively shorter than corresponding seta in female.
P6 represented by posterolateral flap closing off genital aperture on either side (fig.12 E) ; spinular pattern on surface as indicated in figure 12 E. Posterolateral corners distinctly pointed and protruding laterally so that they are discernible in dorsal aspect (Fig. 12A, D), occasionally with bifid tip (Fig.12F, arrowed.


Species Triconia giesbrechti - Plate 8 of morphological figuresIssued from : K. Cho, W.-S. Kim, R. Böttger-Schnack & W. Lee in J. Nat. Hist., 2013. [p.16, Table 2].
Morphological characters of Triconia giesbrechti of the Triconia dentipes-subgroup from the north-eastern equatorial Pacific and The Red Sea.
Nota: Orn: ornamentation; L: length; W: width;

Compare with related species and form variants of the Triconia dentipes-subgroup from the north-eastern equatorial Pacific and from other regions: T. dentipes, T. pacifica, T. elongata, T. constricta.


Species Triconia giesbrechti - Plate 9 of morphological figuresIssued from : K. Cho, W.-S. Kim, R. Böttger-Schnack & W. Lee in J. Nat. Hist., 2013. [p.17, Table 2 (Continued)].
Morphological characters of Triconia elongata of the Triconia giesbrechti-subgroup from the north-eastern equatorial Pacific.
Nota: Orn: ornamentation; L: length; W: width; OSDS: outer subdistal spine; ODS: outer distal spine; CP: distal conical process

Compare with related species and form variants of the Triconia dentipes-subgroup from the north-eastern equatorial Pacific and from other regions: T. dentipes, T. pacifica, T. elongata, T. constricta.


Species Triconia giesbrechti - Plate 10 of morphological figuresIssued from : K. Cho, W.-S. Kim, R. Böttger-Schnack & W. Lee in J. Nat. Hist., 2013. [p.29, Fig.13, C-E].
Female (from NE equatorial Pacific): D-E, P5 and genital double-somite (dorsal and lateral, respectively); C, genital aperture, arrow indicating minute process close to spine.

Compl. Ref.:
Nishibe & Ikeda, 2004 (p.931, Tab. 2, 4, 5); McKinnon & al., 2008 (p.844: Tab.1); Nishibe & al., 2009 (p.491, Table 1: seasonal abundance);
NZ: 5

Distribution map of Triconia giesbrechti by geographical zones
Loc:
S Red Sea, G. of Aden, Australia (North West Cape), Japan (Tosa Bay, Oyashio region), NE tropical Pacific
N: 5
Lg.:
(810) F: 0,45-0,42; (1166) F: 0,44-0,49; M: 0,360-0,414; {F: 0,42-0,49; M: 0,360-0,414}
Rem.: epipelagic.
For Böttger-Schnack (1999, p.109) this species is closely related to T. dentipes and T. elongata, from which it can be distinguished by the different form of the genital double-somite; other differences are found in the size and ornamentation of P5, length of seta VI on caudal ramus, and the ornamentation of the labrum.
For Cho & al. (2013, p.31) females of T. giesbrechti from the Pacific are similar to the typical T. giesbrechti Böttger-Schnack (1999), originally described from the Red Sea, with regard to almost all morphometric characters including the endopodal spine lengths on P4, which have been found to be of relevance for separating sibling species within this subgroup of Triconia. Slight morphometric differences between the two forms appear to be present in 1- the proportional spine length of the outer subdistal spine on P2 enp-3 not reaching as far as the insertion of the outer distal spine in Pacific specimens, but reaching this point in those from the Red Sea, and 2- the relative length of antennary seta F, being somewhat shorter than seta D and about 1/3 longer than seta G in the Pacific specimens, whereas seta F is about as long as seta D and twice the length of G in the typical form. However, these small morphometric differences were not regarded as sufficient for establishing a new species for the Pacific form.
Males of T. giesbrechti are described from the equatorial Pacific for the first time. They are identified on the basis of the conspicuous surface ornamentation of the exoskeleton, showing numerous deep pits as in the female, as well as on the proportional spine lengths of the outer basal setae and the two exopodal setae on P5.
See also Triconia constricta.
Last update : 05/02/2015
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