Zophobas morio

Zophobas morio is a species of darkling beetle, whose larvae are known by the common name superworm, kingworm, morio worm or simply Zophobas. Superworms are common in the reptile pet industry as food, along with giant mealworms, which are Tenebrio molitor larvae sprayed with juvenile hormone.

Zophobas morio
Zophobas morio larva - top (aka).jpg
Scientific classification edit
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Tenebrionidae
Genus: Zophobas
Z. morio
Binomial name
Zophobas morio
(Fabricius, 1776)
  • Tenebrio morio Fabricius, 1778
  • Helops morio (Fabricius 1777)
  • Zophobas atratus (Fabricius, 1775)
  • Tenebrio atratus Fabricius 1775
  • Zophobas rugipes (Kirsch, 1866

The larvae resemble very large mealworms, about 50 to 60 mm (1.7–2.25 in) long when full size, but unlike mealworms, the ends of their bodies are very dark, almost resembling a black color. Once they reach adult size, the larvae pupate, and later emerge as large, light coloured beetles, which in time darken to black. The larvae will not pupate if kept in a container with many other larvae and plentiful food, where they receive constant bodily contact. Keeping superworms this way is commonly used to hinder pupation. To mature the superworms, they must be kept alone for about 7–10 days. They will then, upon maturation, emerge from their pupal stage as darkling beetles.[1]

Superworms are accepted by lizards, turtles, frogs, salamanders, birds, koi and other insectivorous animals. Their nutritional values are similar to those of mealworms, so it is possible that supplementation with calcium is necessary if they are used as a staple food item. In some cases they are preferred over mealworms due to their softer exoskeleton[citation needed], making them more digestible to some reptiles. The larvae are odor-free (but the beetles possess a pungent chemical defense that may be released when provoked), and can be easily contained, making them ideal for raising at home to feed a collection of captive insectivores. The nutritional profile of the larvae is "46.80% proteins, 43.64% lipids, 8.17% ashes and 1.39% carbohydrates."[2]

Relationship with humansEdit

As pet feedEdit

As with the popular mealworm, Zophobas morio larvae (commonly known as superworms) are widely used in pet care, more specifically as feed.

Superworms are relatively high in protein and fat, which make them attractive pet feed for captive reptiles, amphibians, fish, and birds. Their ability to stay alive without eating for 1–2 weeks makes the keeping process highly feasible for bulk commercial availability around the world. However, pet owners are advised to keep them in warm temperatures as, unlike the mealworm, superworms do not enter the process of hibernation. They are also known to bite when threatened by handling, although the bite is not very painful.

As waste disposal agentsEdit

In 2016, it was discovered by a group of high school students in Ateneo de Manila University that Zophobas morio larvae may be used in waste disposal as the larvae were found to consume expanded polystyrene foam. The research study compared the larger Zophobas morio larvae to the Tenebrio molitor larvae, which were previously used in a Stanford study tackling polystyrene degradation.[3][4][5] The former study found that in equal bulk-weight categories, the Zophobas morio larvae may consume greater amounts of polystyrene for longer periods of time.


This beetle occurs naturally in tropical regions of Central and South America, but has spread across the world for use as food for reptiles and other insectivorous pets.

See alsoEdit



  1. ^ Rumbos, C I; Athanassiou, C G (2021-04-09). "The Superworm, Zophobas morio (Coleoptera:Tenebrionidae): A 'Sleeping Giant' in Nutrient Sources". Journal of Insect Science. 21 (2). doi:10.1093/jisesa/ieab014. PMC 8033247. PMID 33834209. Retrieved 2021-05-23.
  2. ^ Soares Araújo, Rafael Ribeiro; dos Santos Benfica, Tatiana Aparecida Ribeiro; Ferraz, Vany Perpetua; Moreira Santos, Eleonice (March 2019). "Nutritional composition of insects Gryllus assimilis and Zophobas morio: Potential foods harvested in Brazil". Journal of Food Composition and Analysis. 76: 22–26. doi:10.1016/j.jfca.2018.11.005. S2CID 104437154.
  3. ^ Jordan, Rob (29 September 2015). "Plastic-eating worms may offer solution to mounting waste, Stanford researchers discover". Stanford News Service. Archived from the original on 20 February 2021. Retrieved May 21, 2020.
  4. ^ Aumentado, Dominic. "A Comparative Study of the Efficacy of Tenebrio molitor larvae and Zophobas morio larvae as Degradation Agents of Expanded Polystyrene Foam". Academia. Retrieved May 5, 2020.
  5. ^ "It's a 'horrible plastic' — and these 'superworms' can grow from eating it". ABC News. 9 June 2022.

Further readingEdit

  • Freye, Henry B.; Esch, Robert E.; Litwin, Catherine M.; Sorkin, Louis (1 July 1996). "Anaphylaxis to the Ingestion and Inhalation of Tenebrio molitor (Mealworm) and Zophobas morio (Superworm)". Allergy and Asthma Proceedings. 17 (4): 215–9. doi:10.2500/108854196778996903. PMID 8871741.
  • Leung, Dong; Yang, Depo; Li, Zhuoxue; Zhao, Zhimin; Chen, Jianping; Zhu, Longping (5 January 2012). "Biodiesel from Zophobas morio Larva Oil: Process Optimization and FAME Characterization". Industrial & Engineering Chemistry Research. 51 (2): 1036–1040. doi:10.1021/ie201403r.
  • Prado, R. A.; Santos, C. R.; Kato, D. I.; Murakami, M. T.; Viviani, V. R. (2016). "The dark and bright sides of an enzyme: a three dimensional structure of the N-terminal domain of Zophobas morio luciferase-like enzyme, inferences on the biological function and origin of oxygenase/luciferase activity". Photochemical & Photobiological Sciences. 15 (5): 654–665. doi:10.1039/C6PP00017G. PMID 27101527.
  • Latney, La'Toya V.; Toddes, Barbara D.; Wyre, Nicole R.; Brown, Dorothy C.; Michel, Kathryn E.; Briscoe, Johanna A. (February 2017). "Effects of various diets on the calcium and phosphorus composition of mealworms (Tenebrio molitor larvae) and superworms (Zophobas morio larvae)". American Journal of Veterinary Research. 78 (2): 178–185. doi:10.2460/ajvr.78.2.178. PMID 28140633.