---
title: Dragonet (Callionymidae)
scientific_name: Callionymidae
common_name: Dragonet
rank: Family
published: 2024-11-19T18:41:51.573Z
updated: 2026-08-23T21:57:19.991Z
tags: Dragonet, Callionymidae, Red Sea, Marine Life, Diving
url: https://redseacreatures.com/taxon/fishes/bony-fishes/dragonet
---

# Dragonet (*Callionymidae*)

## Quick facts

- **Rank:** Family
- **Scientific name:** Callionymidae
- **Body shape:** Bottom-dwelling - Stocky, big-headed, sits on the reef or sand rather than swims - scorpionfishes, groupers, gobies.
- **Species listed here:** 6

## How to recognise this group

- elongated, slightly flattened body
- large, upward-pointing eyes
- sits on substrate, hops with pectoral and pelvic fins
- camouflaged colouration

A dragonet has no scales anywhere. The whole fish is bare skin under a heavy coat of mucus, and in this family the mucus is the defense: bitter, strong-smelling and, in the better-studied members, toxic enough that an animal with no armor and no useful turn of speed is left alone anyway.

The second piece of equipment is a spine. Under each gill cover sits a large preopercular spine, hooked at the tip and usually barbed along the upper edge. It is the character the whole family is defined by, its exact shape is how species are told apart, and it is the thing a careless hand finds first.

Then there is the reason people book a dive at sunset. Dragonets spawn in the water column, at dusk, in pairs. The male raises his first dorsal fin like a flag through the approach, the two fish press together side by side, and they rise off the bottom together, release eggs and sperm at the top of the climb and drop back into the sand. In the Pacific this runs to a timetable, because the mandarinfish is a dragonet and guides sell the sunset slot on reefs where a colony is known. Nothing in this sea has that reputation.

The mandarinfish is worth one more sentence for how its blue is made. Nearly every blue animal produces the color by scattering light through fine structure; this one is among the very few known to manufacture a true blue pigment and carry it in cells built to hold it. That is a fact about the family rather than about the Red Sea.

The six listed here are sand-colored and small, wedge-headed with the eyes set high on top, and they do not really swim. They hop from one spot to the next on stiff pectoral and pelvic fins, on open sand between coral heads, and the way to find one is to watch for movement rather than for a fish.


## Species (6)

- [Blue-Spotted Dragonet (Diplogrammus infulatus)](https://redseacreatures.com/taxon/fishes/bony-fishes/dragonet/blue-spotted-dragonet)
- [Delicate Dragonet (Callionymus delicatulus)](https://redseacreatures.com/taxon/fishes/bony-fishes/dragonet/delicate-dragonet)
- [Filamentous Dragonet (Callionymus filamentosus)](https://redseacreatures.com/taxon/fishes/bony-fishes/dragonet/filamentous-dragonet)
- [Randall’s Dragonet (Diplogrammus randalli)](https://redseacreatures.com/taxon/fishes/bony-fishes/dragonet/randalls-dragonet)
- [Smallhead Dragonet (Callionymus erythraeus)](https://redseacreatures.com/taxon/fishes/bony-fishes/dragonet/smallhead-dragonet)
- [Yellow Dragonet (Callionymus flavus)](https://redseacreatures.com/taxon/fishes/bony-fishes/dragonet/yellow-dragonet)

---

*Source: [Red Sea Creatures](https://redseacreatures.com/taxon/fishes/bony-fishes/dragonet)*
*Updated: August 23, 2026*