Spotted sawtooth butterfly

Prioneris thestylis is a valid pierid species, commonly called the spotted sawtooth. Bingham's historical treatment traces the name to Pieris thestylis, Doubleday's original combination. It is not treated here as Delias thestylis: resemblance to a jezebel does not make that genus substitution valid. [1][2]

The inspected dorsal specimen has a white ground with dark veins and a dark forewing apex enclosing pale elongated marks. Bingham describes the upper pattern in detail. The Taiwan monograph describes more extensive dark pattern below, with yellow areas, and stronger dark markings in females. [1][2][3]

The Taiwan fauna places the species mainly at low to moderate elevations and notes that it is seldom seen in northern Taiwan. Its account contrasts this distribution with similar-looking higher-elevation Delias. [3]

That local comparison is more useful than assigning every dark-veined white butterfly the same habitat.

The regional monograph describes multiple generations. [3]

This supplies a local seasonal framework without giving an exact development interval for every population. Eggs, caterpillars, pupae and adults remain different stages; a larval photograph should be linked to a documented rearing or identification before entering a species gallery.

Capparis sabiaefolia is the host named in the Taiwan monograph. DearLep preserves additional regional host records with their own identifications. [3][4]

Keep the plant's recorded species name and source together: caper-family resemblance alone is insufficient to assign all plants in the family as equivalent larval food.

The monograph describes thestylis as a faster, more powerful flyer than the similar Delias in its comparison. [3]

That is a regional natural-history observation, not a measured universal speed. It is most useful alongside a settled pattern view and the local elevational context.

The Taiwanese diagnosis notes teeth along the male forewing's leading edge and their absence in the female. [3]

Such a structural detail helps explain why the common name cannot be read merely as a jagged painted border. Compare the correctly sexed wing edge in an identified specimen.

A similar adult pattern can occur in butterflies with different local habitats or plant relationships. The Taiwan comparison supplies one way to investigate that resemblance without collapsing the taxa together. A plant-host record and an elevation record answer different questions and should each retain their locality.

The historical combination Pieris thestylis leads to older descriptions. Prioneris thestylis is the consolidated species heading. The third word formosana belongs to Taiwan's regional form. [2][4]

Use those names to retrieve evidence without creating duplicate species pages or replacing the genus through a superficial resemblance.

The monograph's account of elevation and northern scarcity does not by itself assign global conservation status. Survey timing, identification and effort matter when interpreting an absence. Records should distinguish a genuine local decline from a butterfly being difficult to identify in flight or surveyed outside its local activity period.

Read a dorsal image as the upper surface: its white hindwings should not be recoloured from an unrelated underside. A lower-surface view may show stronger yellow and dark pattern. Keep paired views linked to the same insect where possible and compare the forewing apex and venation at full size.

The upper surface offers a linear composition defined by dark veins and the forewing's apical pattern. An underside subject creates a different visual emphasis. Each view can support its own artwork, while an accurate caption makes clear which anatomical surface the viewer is seeing.

Inspect the final-sized work so dark veins remain separate from nearby marks. Preserve a labelled master before shrinking for a web gallery. If handling a real specimen, use its enclosure and photographs; an exposed wing's leading-edge detail should not be touched to test the sawtooth description.

Is thestylis a Delias because its underside resembles one? The valid name is Prioneris thestylis. Are white hindwings inconsistent with a colourful underside? Upper and lower surfaces differ. Does formosana identify an unlocalized image? It is a regional subspecies assignment requiring evidence.

Bingham supplies public-domain historical description and the name trail. The Taiwan monograph supplies regional sexes, hosts, generations and lookalike comparisons. DearLep retains documented local observations, and the museum image supplies the inspected dorsal adult. The sources complement one another without mixing surfaces or geographic forms.