Stag Beetle - Dorcus titanus platymelus

Dorcus titanus platymelus

I. Classification and Distribution

1. Taxonomic Status: Insecta → Coleoptera → Lucanidae → Dorcus; it is a subspecies of **Dorcus titanus**.
2. Native Distribution: Widely distributed in areas south of the Yangtze River in China, parts of North China, as well as Korea, Japan, Vietnam, etc.; commonly found in low-altitude broadleaf secondary forests, orchards, and bamboo forests.
3. Conservation Status: Not classified as a national key protected wild animal, thus without legal protection, but wild populations rely on mature decaying wood environments, so large-scale wild capture that destroys habitats is not permissible; artificially bred individuals can be legally used for ornamental purposes and as model material.

II. Morphological Characteristics (Sexual dimorphism is extremely pronounced)

1. Male (common prototype for models)
   • Body size: Body length varies greatly (males can be large, medium, or small individuals), large males can reach 80+ mm in body length;
   • Characteristic robust flat mandibles, with distinct teeth on the inner side of the mandibles; tooth shape varies depending on individual size; broad head, thick prothorax;
   • Body color: Mostly dark brown to black, with a matte texture on the body surface, some individuals have slightly reddish-brown edges on their elytra, no strong metallic reflection;
   • Mandible use: Fighting weapon for males to compete for food, territory, and mates.
2. Female
   • Significantly smaller than males, body length mostly 30–40 mm;
   • No exaggerated mandibles, small and rounded head, understated appearance; body color similar to males, appearing more modest;
   • Females are responsible for drilling into decaying wood to lay eggs and are central to population reproduction.

Male

Female

III. Life History and Habits

1. Larva: Typical grub-like, milky white C-shape; lives in decaying wood or fermented sawdust of broadleaf trees (such as oak, camphor); feeds on humus and decaying wood; larval stage is very long (1–2 years), temperature affects development speed; mature larvae pupate in decaying wood.
2. Adult
   • Emergence period: Mostly in summer, adult lifespan can reach 6–12 months under artificial rearing;
   • Diet: In the wild, they feed on tree sap, ripe fruits (such as peaches, lychees); in artificial rearing, specialized beetle jelly, bananas, etc., are commonly used;
   • Nocturnal, weak phototaxis, mostly hide in tree hollows or under decaying wood during the day;
   • During fights, males will clamp onto their opponents with their mandibles, attempting to flip them over.

IV. Easy Distinctions & Trivia

1. Distinguishing Dorcus titanus platymelus vs. Metalleifer Stag Beetle: Dorcus titanus platymelus has robust and flat mandibles, and a heavy build; Metalleifer stag beetles have slender, sickle-shaped mandibles and an overall delicate build.
2. Distinguishing Dorcus titanus platymelus vs. Rhinoceros Beetle: Dorcus titanus platymelus fights with its mandibles and has no horns; male Rhinoceros Beetles have a head horn + thoracic horn and no giant mandibles.
3. Male body size differentiation is greatly influenced by nutrition during the larval stage: only with abundant food and a stable environment during the larval stage can they develop into large males; insufficient nutrition results in small males.