Plate 1 issued from : G.A. Heron & B.W. Frost in Proc. Biol. Soc. Washington, 2000, 113 (4). [p.1024, Fig.3]. As Oncaea canadensis.
Female (49°56'N, 144°54'W): A-B, habitus (dorsal and lateral, respectively; scale bar: r); C, urosome (dorsal; scale bar: s); D, right A1 (scale bar: t); E, left A2 (scale bar: s); F, labrum (scale bar: u).
Scale bars: 0.1 mm.

Prosome about twice as long as urosome. Pediger 2 with dorsoposterior projection in lateral view. Genital segment length about equal to that of remainder of urosome ; gonopore with a spiniform setule just anterior to midregion of dorsal surface ; insertion of setule surrounded by complex layers of overlapping chitinous layers. Caudal ramus 4 times as long as wide and longer than anal segment. A1 6-segmented with armature formula 3, 8, 4+1 spinule, 3.1 esthete, 7+1 esthete. A2 3-segmented ; 2nd segment with row of minute dentiform spinules along inner surface an douter rows of setules, terminal segment with row of setules on posterior surface, proximal inner surface with curved denticulate spine and 3 setae ; distally 4 curved long spines and 3 setae. Labrum posteriorly protuberant ; free margin divided into 2 rounded posteroventral lobes, each with a row of dentiform setules on undersurface ; lobes separated by quadrate vertex ; several thin lamella extend posteriorly between the lobes ; a semicircular ridge bears a row of spatulate setules anterior to the vertex ; ovate protuberance anterior to labrum and lateral setules.

Plate 2 issued from : G.A. Heron & B.W. Frost in Proc. Biol. Soc. Washington, 2000, 113 (4). [p.1025, Fig.4]. As Oncaea canadensis.
Female: A, left Md (scale bar: v); B, right Mx1 (scale bar: v); C, left Mx2 (scale bar: v); D, left Mxp (scale bar; t); E, P1 (scale bar: t); G, P3 (scale bar: t).
Scale bars: 0.1 mm.

Nota : Md bearing 5 elements : outer stout seta with row of long setules ; broad element with posterior row of setules and concave inner margin wihich cups basal edge of adjacent bladelike element with inner dentiform edge ; 2 posterior spinulose setae, the shorter seta hyaline. Mx1 flat, bilobed ; 2 setae and 1 spine on inner lobe ; 4 setae on outer lobe. Mx2 2-segmented ; 1st segment with expanded base ; 2nd segment produced distally as elongate claw, with 2 inner rows of setules and an outer lateral seta ; a seta and a curved element with 2 rows of medial setules on proximal inner surface. Mxp 4-segmented, 1st segment with sclerotized areas enclosing clusters of spinules ; terminal segment consisting of long claw with row of setules on concave surface ; short element near inner base. Swimmeing legsP1-P4 with serrate, hyaline flange on spines ; endopods with terminal cone. P5 with free segment elongate ; 2 terminal setae, the longer spiniform, reaching beyond gonopore, and almost twice the length of the shorter ; outer basal seta. P6 represented by long spatulate setule on gonopore.

Plate 3 issued from : G.A. Heron & B.W. Frost in Proc. Biol. Soc. Washington, 2000, 113 (4). [p.1021, Fig.1, A]. As Oncaea canadensis.
Female: P2-P4 endopod terminal ''spine set'' (combination of the lengths, shapes, and position of the three or two terminal spines on the endopods of swimming legs 2-4 for different Oncaea' species).

Nota: endopod of P4 with lateral spine extending just to subterminal spine base.

Plate 4 issued from : G.A. Heron & B.W. Frost in Proc. Biol. Soc. Washington, 2000, 113 (4). [p.1027, Fig.5]. As Oncaea canadensis.
Female: A, P4 (scale bar: t).

Male: B, habitus (dorsal; scale bar: r); C, habitus (lateral; scale bar: w); D, two posterolateral hooded pore clusters from two cephalosomes (scale bar: x); E, urosome (dorsal (scale bar: w); F, right Mxp (scale bar: x); G, pediger 4 distal corner and segment of P5 (scale bar: x).
Nota: Prosome lacking dorsal projection on 3rd prosomal segment. Body with scattered refractile points, usually associated with pores. Prosome twice as long as urosome ; cephalosome with posterolateral cluster of small hooded pores (configurations variable but basically circular with a center devoid of pores.. Pediger 4 with acute angle of lateroposterior corner in lateral view (corner with inner pores). Genital segment length approximately 1/3 greater than remainder of urosome

Plate 5 issued from : G.A. Heron & B.W. Frost in Proc. Biol. Soc. Washington, 2000, 113 (4). [p.1028, Table 4].
Armature of swimming legs P1-P4 of Oncaea canadensis (= Triconia canadensis).
Si = inner setae; St = terminal seta; Se = outer setae. Roman numerals: spines; arabic numerals: setae.