21, 31, 41) bilaterally symmetrical, irregularly subquadrate in side profile, dorsal margin broad, ventral margin narrow, dorsal margin inclining to the ventrad
Spiracle on A1 located ventrad
and cephalad, whereas that of A2 is aligned with the remaining spiracles and located at center of segment in lateral view.
Face (Figs 1, 3) with dorsal three quarters generally brown, parallel-sided, with lateral and especially ventral margins yellowish, generally flat, ventral margin of this portion distinctly convex; ventral and ventrolateral portions shiny to subshiny, subshiny portions greyish microtomentose; gena with thin area immediately ventrad
of eye whitish to silvery white, microtomentose; postoccipital thin area immediately posterior to posterior margin silvery white, microtomentose.
At the sub-generic level, the speciose subgenus Hippichthys is characterized by the lateral trunk ridge being deflected ventrad
at the anal ring while Parasyngnathus has no lateral trunk ridge deflection at the anal ring (Dawson 1985).
12, 25, 31) and a serrated keel at the base of a filiform embolus, curved prolaterally dorsad, running a semicircle behind tegulum, appearing retrolaterally and pointing ventrad
in the male palp (Figs.
Both species possess comparable beak placement, the number of umbonal corrugations that curve ventrad
around the umbo, disc convexity, and node shape, node prominence, and number of nodes.
Two protibial sensilla had ventrad
origins with one in a posteroventral position and the second inserted ventrally between that sensillum and the anteroventral spinular spinulae (comb).
The whorl-section is oval with flanks tapering only slightly ventrad
18); aedeagus with phallobase in ventral view, each ventral lob with 4 or 5 spines on ventral aspect, 2 large forked processes arising from near middle of lateral margin, inner branch with 3 apical teeth, outer branch with apex acute, curving ventrad
apically (Chen & He 2010: Fig.
Macrosculpture of metepisternum becoming villiform ventrad
The density of ribbing, the absence or near-absence of a keel, the ribs often meeting across the venter, the slight ventrad
increase in width of the ribs, and the generally rectiradiate ventral ends of the ribs all indicate Sowerby's species.
Aedeagus curved ventrad
, bent in "C" shape, shaft slightly compressed, with small retrorse spines, abruptly narrowing at distal fourth; phallotrema subapical on dorsolateral surface; periandrum as a transverse strut obtusely bent caudally against the phallotheca, periandrum and anal segment in close contact; connective long, stout, shortly braced to the periandrum above tectiform structure.