Dilong (地龍)

Dilong is not presented in the sources as a single individualized mythic progenitor but as a lexical and conceptual category within Chinese dragon (long 龍) classification mapped onto the cosmic opposition di 地 (earth/land) versus tian 天 (heaven/sky). The earliest attested literary occurrence in the provided material appears in a mid-seventh-century historical narrative: the History of the Southern Dynasties biography of Wang Sengbian records witnesses seeing paired dragons ascend and a dilong leaving Liang territory, an action read as a portent in 550 CE. Over time the lexical unit 地龍 was extended by analogy to name earthly creatures — most notably the earthworm (qiuyin 蚯蚓), recorded in herbal literature (e.g., Bencao Gangmu) under alternate names including dilong/tulong — and later recycled into modern scientific nomenclature (for example, the dinosaur genus name Dilong and use as the Chinese name for other fossil taxa).

The supplied sources do not provide a fixed, detailed visual description unique to a mythic Dilong. In mythic taxonomy it is treated as a variety of long (龍, "dragon") and so inherits the generic dragon imagery of Chinese tradition (serpentine, scaled long forms capable of movement between realms), but is characteristically described in contrast as more earthbound than the tianlong (天龍, "heavenly dragon"). Sources explicitly note Dilong's domainal affiliation rather than a standardized morphology; concrete morphological details (size, limbs, scales, horned head, etc.) are not given in the excerpts. Separately, where 地龍 names an animal the appearance is that of the ordinary earthworm (qiuyin 蚯蚓); in materia medica the worm form (specifically the red earthworm Lumbricus rubellus in modern summaries) is the relevant physical referent.

Sources attribute to Dilong primarily a domainal/cosmological function: it is an earth-associated dragon type paired conceptually with tianlong (heavenly dragon). No distinct catalogue of supernatural powers is recorded in the provided material beyond this domainal affiliation and the implication that, unlike many Chinese dragons described as able to ascend or fly, a dilong is comparatively earthbound. A medicinal-literary belief recorded in the Bencao Gangmu (as noted by Li Shizhen) links earthworms called dilong with meteorological influence: the myth that earthworms (like dragons) can create yinqing (陰晴, "cloudy and clear; unsettled weather"). Beyond the weather-affecting attribution attached to the worm sense, the sources do not record other specific abilities (healing powers beyond medicinal use, control of rivers, speech, or agency toward humans) for a mythic Dilong.