---
title: "Tailless Lineblue"
description: "Prosotas dubiosa — Insects & spiders. Prosotas dubiosa, the tailless lineblue or small purple lineblue, is a blue butterfly (Lycaenidae) found in Asia to Australia."
canonical: https://animalchecklist.com/animal/tailless-lineblue
last_updated: 2026-09-20
---

# Tailless Lineblue

> Prosotas dubiosa — Insects & spiders. Prosotas dubiosa, the tailless lineblue or small purple lineblue, is a blue butterfly (Lycaenidae) found in Asia to Australia.

- Scientific name: *Prosotas dubiosa*
- Category: `insects` (Insects & spiders)
- Habitats: unknown
- iNaturalist observations: 8351
- Wikidata: [Q7250709](https://www.wikidata.org/wiki/Q7250709)
- iNaturalist taxon: [356143](https://www.inaturalist.org/taxa/356143)

## Names

- en: Tailless Lineblue

## Countries with the most observations

IN (2111), HK (1346), SG (852), AU (767), TW (237), ID (159), TH (141), MY (113), MO (86), PH (66), CN (62), LK (45)

## Summary

Prosotas dubiosa, the tailless lineblue or small purple lineblue, is a blue butterfly (Lycaenidae) found in Asia to Australia. The species was first described by Georg Semper in 1879.
Unlike many other species in the Prosotas genus, P. dubiosa does not have hair-like filaments ("tails") protruding from its hindwings, thus the tailless in its common name.

Text: Wikipedia (en), CC BY-SA 4.0 — https://en.wikipedia.org/wiki/Prosotas_dubiosa

## Photo

![Tailless Lineblue](https://animalchecklist.com/img/animals/tailless-lineblue/medium.jpg)

Photo: Stephen Matthews · CC0 · inaturalist — https://www.inaturalist.org/observations/357812903

## Machine access

`GET https://animalchecklist.com/api/v1/animals/tailless-lineblue?lang=en` — see [openapi.json](https://animalchecklist.com/openapi.json).