---
title: "Leptastrea Coral: Facts, Species and Aquarium Care"
url: https://thesea.org/leptastrea/
date: 2026-03-05
modified: 2026-11-07
lang: en
author: "Blane Perun"
description: "Leptastrea is a genus of small, massive-to-encrusting Indo-Pacific stony corals. Classification, species, identification and how to keep it in a reef tank."
categories:
  - "Large-Polyp Stony"
image: https://thesea.org/wp-content/uploads/leptastrea-coral-thesea-org-blane-perun-1024x572.webp
word_count: 3515
---

# Leptastrea Coral: Facts, Species and Aquarium Care

[TheSea.Org](/)▸[Corals](/coral-species/)▸[LPS Corals](/large-polyp-stony-corals/)▸Leptastrea

# Leptastrea — A Small Coral With a Complicated Family Tree

Large-Polyp Stony
By [Blane Perun](/about-blane-perun/)
November 8, 2026
16 min read

Genus card

FamilyLeptastreidae (Rowlett, 2020)
Former familyFaviidae; later *incertae sedis*
Accepted species8 (WoRMS, 2026)
Best known*Leptastrea purpurea*
Colony formMassive to encrusting
RangeMainly Indo-Pacific
ReproductionBrooder (*L. purpurea*, *L. transversa*)
DifficultyEasy to moderate

*Leptastrea* is a genus of small, massive to encrusting reef-building stony corals found across the Indo-Pacific. In aquariums it is sold as “Leptastrea” or “lepto,” often in bright green, red or two-tone colours, and it behaves much like a small favia. On the reef it is easy to overlook, yet it has become one of the best-studied brooding corals in the world because it releases larvae almost every day and copes unusually well with heat.

Its classification has been unusually unsettled. The genus was described by Milne Edwards and Haime in 1848 and spent most of its history in the family Faviidae. When a 2012 DNA-based revision led by Ann Budd showed that Faviidae was not a natural group, *Leptastrea* was left as *incertae sedis*, meaning its family was uncertain. In 2020 it was finally given its own family, Leptastreidae Rowlett, 2020, and in the same year a genomic study split and renamed several of its species. This guide covers the species, identification, range, biology, reproduction, heat tolerance, research use, conservation and aquarium care.

What species are in Leptastrea?
The World Register of Marine Species (WoRMS) currently accepts eight species. Two of them are very new: *L. gibbosa* and *L. magaloni* were both described by Francesca Benzoni and Roberto Arrigoni in 2020. One name that still appears in older books and on dealer lists, *L. pruinosa* Crossland, 1952, is now treated by WoRMS as a junior subjective synonym of *L. purpurea*, so a coral labelled “pruinosa” is, in current taxonomy, simply a variant of the commonest species.

| Species | Author and year | Notes |
| ------- | --------------- | ----- |
| *L. purpurea* | (Dana, 1846) | Most widely reported species; *L. pruinosa* Crossland, 1952 is now a synonym |
| *L. bottae* | (Milne Edwards & Haime, 1849) | Recovered as a distinct lineage in 2020 genomic work |
| *L. inaequalis* | Klunzinger, 1879 | Recovered as a distinct lineage |
| *L. transversa* | Klunzinger, 1879 | Recovered as a distinct lineage; a brooder used in larval research |
| *L. bewickensis* | Veron, Pichon & Best, 1977 | Described from eastern Australia |
| *L. aequalis* | Veron, 2000 | Described in Veron’s *Corals of the World* |
| *L. gibbosa* | Benzoni & Arrigoni, 2020 | New in 2020; Pacific Ocean |
| *L. magaloni* | Benzoni & Arrigoni, 2020 | New in 2020; south-western Indian Ocean |

The species names record two centuries of coral science. *L. purpurea* was named by James Dwight Dana in 1846, in the coral volume that came out of the United States Exploring Expedition. *L. inaequalis* and *L. transversa* were described by Carl Benjamin Klunzinger, whose monograph on the corals of the Red Sea appeared in 1879. *L. bewickensis* came from the large survey of eastern Australian corals by Charlie Veron, Michel Pichon and Mary Best in the 1970s, and *L. aequalis* was added by Veron in 2000. The 2020 additions came not from new collecting expeditions in remote places but from re-examining corals that had been collected for years and then reading their DNA.

How did genetics change Leptastrea?
The turning point was a 2020 paper in *Coral Reefs* by Arrigoni and colleagues titled “Towards a rigorous species delimitation framework for scleractinian corals based on RAD sequencing: the case study of *Leptastrea* from the Indo-Pacific.” The team sequenced 77 colonies from nine Indo-Pacific localities, including Mayotte in the Indian Ocean and the Isle of Pines in New Caledonia. Restriction-site associated DNA sequencing (RADseq) produced tens of thousands of genetic markers: 44,162 single-nucleotide polymorphisms in the full holobiont dataset and 62,728 when the reads were mapped to a coral transcriptome. The researchers also assembled nearly complete mitochondrial genomes and ribosomal DNA for comparison.

The analysis recovered six distinct species among the samples. Three matched existing names, *L. bottae*, *L. inaequalis* and *L. transversa*. A fourth lineage combined colonies that looked like *L. purpurea* with others that looked like *L. pruinosa*; the authors described it as showing remarkable skeletal variability and sank *pruinosa* into *purpurea*. The last two lineages had no names at all, and they were described in the same paper as *L. gibbosa* from the Pacific and *L. magaloni* from the south-western Indian Ocean. The mitochondrial and ribosomal trees agreed with the RADseq tree but resolved relationships less clearly, which is a familiar problem in reef corals, whose mitochondrial DNA evolves slowly.

The lesson goes beyond one genus. Coral species were defined for most of the twentieth century by skeleton shape, and *Leptastrea* shows how badly that can mislead: one species can vary so much that it was split into two names, while two real species had been hidden among the existing ones. The paper was explicitly framed as a template for delimiting species in other difficult coral groups by combining genomic, morphological, morphometric and distributional evidence.

How do you identify Leptastrea?
On the reef *Leptastrea* forms low, compact colonies: small domes, thick plates or crusts that follow the shape of the rock underneath. The corallites, the stony cups that hold each polyp, are small and crowded, with walls that touch or nearly touch. Living colonies are usually brown, cream, grey or green in the wild, sometimes with a contrasting colour in the centre of each cup, which is how *L. purpurea* earned the common name ocellated brain coral. Aquarium strains are selected for fluorescent greens, reds and two-tone patterns.

The main look-alikes are other small massive corals that used to sit beside it in Faviidae, such as [Favites](/favites/), *Dipsastraea* (the Indo-Pacific corals long sold as [favia](/favia/)) and [Goniastrea](/goniastrea/). Compared with these, a typical *Leptastrea* has smaller cups and a flatter, more encrusting colony, and its polyps are usually retracted during the day. None of these clues is reliable on its own. As the 2020 genomic work showed, skeletal features vary within a single species, so naming a colony to species normally requires a cleaned skeleton, a good reference and, increasingly, DNA. For divers and hobbyists, “*Leptastrea* sp.” is an honest label.

Where does Leptastrea live?
The genus is spread throughout the tropical Indo-Pacific, from the western Indian Ocean and the Red Sea, where several species were first described, east across the Pacific. Colonies grow on reef flats, back-reef areas, slopes, rock and rubble, often in shallow water where light is strong and wave action is significant. The encrusting habit lets *Leptastrea* occupy small patches of hard substrate between larger corals and on surfaces that bigger, faster-growing species cannot hold.

On Guam, *L. purpurea* is abundant on back-reefs, and the population at Luminao Reef has supplied colonies for several laboratory studies. At the northern edge of reef-building corals in southern China, a 2023–2024 survey around the Dapeng Peninsula found *L. purpurea* among the indicator species of heavily used tourist areas, where coral communities have shifted from branching species towards tougher, clumping forms. That fits the picture of a coral that tolerates conditions many neighbours cannot.

8Accepted species (WoRMS)
2020Family Leptastreidae named
77Colonies in the 2020 RADseq study

How does Leptastrea feed and grow?
Like other reef-building stony corals, *Leptastrea* lives in partnership with single-celled algae of the family Symbiodiniaceae, which sit inside its tissues and supply sugars from photosynthesis. That partnership provides most of a colony’s energy in clear, shallow water. The polyps also capture plankton with their tentacles, mostly at night, which adds nitrogen, phosphorus and other nutrients that photosynthesis alone cannot provide.

Colonies grow by budding new polyps at their edges and between existing cups, slowly thickening into a low dome or spreading as a crust. They remain small compared with many massive corals; the Guam colonies used in laboratory experiments were only about 8 to 10 square centimetres. Small size is not a sign of weakness. A low, encrusting coral is hard for waves to break, quick to cover a patch of rock and able to reproduce while still small, which is part of why *Leptastrea* is often among the survivors after disturbances.

How does Leptastrea reproduce?
*Leptastrea purpurea* and *L. transversa* are brooders. Instead of releasing eggs and sperm into the water for external fertilisation, as most reef corals do during mass spawning, they fertilise eggs internally and release fully formed planula larvae. Studies on Guam found that *L. purpurea* releases larvae daily, in a non-seasonal, non-lunar pattern. That is unusual: most brooding corals planulate on a monthly or seasonal cycle, and most broadcast spawners release gametes on only a few nights a year.

Once released, the larvae swim for a time and then search for a place to settle. Like most corals, *L. purpurea* larvae prefer crustose coralline algae, the pink, rock-hard algae that cement reefs together, and metamorphosis is triggered in the presence of the coralline alga *Hydrolithon reinboldii*. How far the larvae travel in the wild is unknown; brooded larvae of other corals range from staying on their home reef to drifting hundreds of kilometres.

Because the larvae appear every day, researchers have developed shortcuts for collecting them. A 2024 method paper showed that immersing colonies of *L. purpurea*, *L. transversa* and three other brooders in seawater containing 5 to 10 grams of potassium chloride per litre for 5 to 7 minutes made them release larvae almost immediately, with yields similar to traditional collection and larvae that survived storage for weeks and settled normally. A 2025 study by the same research group then identified cycloprodigiosin, a bacterial pigment, as a settlement cue that induced settlement at rates between 40 and 93 per cent across nine coral species, four brooders and five broadcast spawners. Work like this matters for reef restoration, where getting enough larvae to settle on clean surfaces is a major bottleneck.

Why is Leptastrea purpurea so heat tolerant?
Between 2013 and 2017, consecutive mass bleaching events hit Guam and reduced coral cover by up to 60 per cent at some sites. Over four years of surveys during those events, *L. purpurea* was recorded bleaching but showed no mortality, while many other species died, and surveys in 2017 found new recruits and growing colonies. Earlier work had already flagged it as bleaching-resistant, with anecdotal reports that larval output rose when the sea warmed.

A team from the University of Guam tested that idea directly. In March 2019 they collected 45 colonies from Luminao Reef, kept some at 28 °C and heated others to 30 °C, above the 29.3 °C average of the site’s warmest month, and counted the larvae. The results, published in *Coral Reefs* in 2022, are summarised below.

| Measure (Guam, 2019–2020) | Control colonies (28 °C) | Heated colonies (30 °C) |
| ------------------------------- | ---------------------------- | --------------------------- |
| Larvae released, Experiment 1 (64 days) | 115 (about 1.8 a day) | 234 (about 3.7 a day) |
| Larvae released, Experiment 2 (15 days) | 25 (about 1.7 a day) | 55 (about 3.7 a day) |
| Visible bleaching of parents | None | None |
| Larval size | Larger | Smaller |
| Post-settlement survival | Lower | Higher |

The heated colonies did not bleach. They released about twice as many larvae as the controls, and those larvae were smaller but settled normally and survived better after settlement. The authors interpreted this as an anticipatory maternal effect: parent colonies experiencing warm water appear to change how they provision their offspring, producing larvae preconditioned for the conditions they are likely to meet. Few such cases have been documented in corals, and only a handful of brooders, such as *Stylophora pistillata* and *Pocillopora damicornis*, are known to keep releasing larvae near their upper thermal limit.

Two cautions apply. The experiments used a modest temperature increase and small numbers of colonies, and larval output fell over time in both treatments, probably because of handling and captivity. Heat tolerance in one species on one island also does not mean the genus is safe. But on reefs where faster-growing corals are dying, tough, steadily reproducing species like *L. purpurea* are likely to make up a growing share of the coral that remains.

Why do scientists use Leptastrea in the lab?
A coral that releases larvae every day, survives handling and tolerates aquarium life is valuable to researchers who need a steady supply of young corals. *L. purpurea* has become a standard test organism in this way. In a 2022 study aimed at developing standard toxicity tests for corals, its larvae were exposed to benzophenone-3, an organic ultraviolet filter used in sunscreens. Inhibition of settlement proved a sensitive endpoint, with a half-maximal effect concentration of 1.84 micrograms per litre in *L. purpurea* larvae. The broadcast-spawning *Acropora digitifera* was even more sensitive in the same study, while the brooding cup coral *Tubastraea faulkneri* was far more tolerant, which shows why tests on a single species can mislead.

Using a hardy, easily bred species as a standard has a practical logic. Toxicity tests and settlement experiments need many larvae of known age and condition, and they need to be repeatable in different laboratories. Broadcast spawners supply larvae on only a few nights a year, while a daily brooder supplies them almost on demand. The trade-off is that a tough coral may understate the harm a pollutant does to more sensitive species, which is why researchers pair it with spawning corals rather than relying on it alone. Each of these studies adds to a practical goal: understanding what young corals need in order to settle and survive on degraded reefs.

Is Leptastrea aggressive?
For its size, it can be. A 2025 study of competition between corals on natural reefs and recruits on artificial reefs recorded 4,151 contact interactions among 28 coral genera. It found that competitive ability was not tied to abundance, and that *Coelastrea*, *Dipsastraea* and *Leptastrea* were among the more competitive genera despite being relatively sparse on the reef. Corals fight with sweeper tentacles, mesenterial filaments that partly digest neighbouring tissue, and by overgrowing one another. The study’s authors suggested a trade-off between aggression and growth, in which small, slow-growing corals defend their space vigorously.

In an aquarium that translates into a simple rule: give *Leptastrea* a few centimetres of clear space and watch the margins after dark, when sweepers are most likely to be extended. It can still lose to strongly aggressive corals such as *Euphyllia* or [Galaxea](/galaxea/), which have much longer sweepers.

Is Leptastrea threatened?
The genus is not singled out as endangered, and the commonest species appear to be among the more resilient corals on many reefs. The two 2020 species were assessed for the IUCN Red List in 2023, which is typical of newly described corals: they enter conservation databases only after they have names. The broader threats are the same as for all reef-building corals: marine heatwaves and bleaching, ocean acidification, pollution, sedimentation and coastal development.

The Dapeng Peninsula survey illustrates the trend. Coral cover there declined by roughly 0.54 per cent a year between 1983 and 2023, and the community shifted from branching corals, which build complex habitat, to clumping species such as *L. purpurea*. Hardy small corals can keep a reef alive in a reduced form, but they do not build the same three-dimensional structure that fish and invertebrates depend on. Their persistence is good news for coral survival but not a substitute for healthy, diverse reefs.

How do you keep Leptastrea in a reef tank?
*Leptastrea* is generally regarded as one of the easier stony corals for a reef aquarium, and its tolerance in the wild matches its reputation in captivity. Moderate reef lighting brings out fluorescent colour without bleaching; very intense light can wash some strains out, so introduce a new colony lower in the tank and move it up gradually. Moderate, varied water flow keeps the small cups clean and carries food to the polyps without blasting the tissue.

Standard reef chemistry is enough: stable salinity, temperature, alkalinity, calcium and magnesium matter more than chasing particular numbers. Like other stony corals it builds a calcium carbonate skeleton, so alkalinity and calcium are consumed as it grows. Feeding is optional because the symbiotic algae supply much of its energy, but small meaty foods, fine pellets or zooplankton offered at night, when the polyps are extended, can speed growth and improve colour. Give an encrusting colony a flat area of rock or a large plug to spread across, and keep it away from long-tentacled neighbours.

Signs of trouble are the same as in other stony corals: receding tissue at the colony edge, loss of colour, or polyps that stop extending at night. Because *Leptastrea* is slow and small, any tissue loss is significant, and the cause is usually instability in chemistry, a neighbouring coral’s sweepers, or pests that graze stony coral tissue.

Can you frag Leptastrea?
Yes. Cut through the skeleton with a coral saw or bone cutters, keeping several polyps on each piece, then glue the fragments to plugs or rock. Encrusting pieces can be grown out and cut again, which is how most coloured aquarium strains are spread. Aquacultured fragments are the better choice for hobbyists, because they are already adapted to aquarium conditions and reduce collection from wild reefs. For background on farming corals rather than collecting them, see our guide to [coral aquaculture](/coral-aquaculture/).

Because some *Leptastrea* species brood larvae continuously, a healthy colony in a mature tank may also release planulae on its own. Most are eaten by fish or filters, but on rare occasions small new colonies appear on rocks near the parent, a reminder that even in captivity this coral keeps reproducing.

Why is Leptastrea hard to classify?
Old coral taxonomy relied almost entirely on skeleton shape, and small massive corals with crowded cups look alike across many unrelated lineages. When DNA sequencing was applied to reef corals in the 2000s, several traditional families, including Faviidae, turned out to be mixtures of groups that had converged on similar shapes. *Leptastrea* did not fit cleanly into any of the reorganised families, so for several years it was officially “family uncertain” before Leptastreidae was created for it in 2020. For reef keepers this mostly matters when reading older books: the same coral may be filed under Faviidae, under *incertae sedis* or under Leptastreidae, depending on the date, and a dealer label may still use a species name that is no longer valid.

Frequently asked questions
What family is Leptastrea in?

Leptastreidae, a family named by Rowlett in 2020. It was formerly placed in Faviidae and then left as *incertae sedis* after a 2012 DNA revision.

How many Leptastrea species are there?

WoRMS accepts eight: *L. aequalis*, *L. bewickensis*, *L. bottae*, *L. gibbosa*, *L. inaequalis*, *L. magaloni*, *L. purpurea* and *L. transversa*. Two were described in 2020.

Is Leptastrea pruinosa still a valid species?

No. A 2020 genomic study found that colonies called *pruinosa* belong to the same lineage as *L. purpurea*, and WoRMS lists *pruinosa* as a synonym.

Is Leptastrea easy to keep?

Yes. It is regarded as hardy in a stable reef tank with moderate light and flow, and optional night feeding.

Is Leptastrea an LPS coral?

It is usually sold as LPS, though its polyps are small and it grows like an encrusting stony coral.

How does Leptastrea reproduce?

*L. purpurea* and *L. transversa* brood their larvae; on Guam *L. purpurea* releases larvae daily rather than on a lunar cycle. Colonies also grow by budding.

Is Leptastrea heat resistant?

*L. purpurea* survived Guam’s 2013–2017 bleaching events without recorded mortality, and in experiments heated colonies released more larvae.

Is Leptastrea aggressive?

Mildly. It extends sweeper tentacles at night and was among the more competitive genera in a 2025 study of coral contact interactions.

More LPS corals

Large-polyp stony corals

[LPS hub](/large-polyp-stony-corals/)
[Euphyllia](/euphyllia/)
[Hammer coral](/hammer-coral/)
[Torch coral](/torch-coral/)
[Galaxea](/galaxea/)
[Bubble coral](/bubble-coral/)

Sources & further reading

- World Register of Marine Species: *Leptastrea* Milne Edwards & Haime, 1848; Leptastreidae Rowlett, 2020; accepted species and synonyms (accessed November 2026).
- Arrigoni, R. et al. (2020). Towards a rigorous species delimitation framework for scleractinian corals based on RAD sequencing: the case study of *Leptastrea* from the Indo-Pacific. *Coral Reefs*. doi:10.1007/s00338-020-01924-8.
- Budd, A.F. et al. (2012). Taxonomic classification of the reef coral family Mussidae (Cnidaria: Anthozoa: Scleractinia). *Zoological Journal of the Linnean Society*.
- Galanto, N. et al. (2022). Effects of elevated temperature on reproduction and larval settlement in *Leptastrea purpurea*. *Coral Reefs*. doi:10.1007/s00338-022-02241-y.
- Nietzer, S. et al. (2024). Coral larvae on demand: a novel method for an instant acquisition of healthy brooded larvae. Research Square preprint. doi:10.21203/rs.3.rs-4616138/v1.
- Fiegel, L.J. et al. (2025). Cycloprodigiosin: a multispecies settlement cue for scleractinian coral larvae. *Scientific Reports*. doi:10.1038/s41598-025-12409-5.
- Miller, I.B. et al. (2022). Towards the development of standardized bioassays for corals: acute toxicity of the UV filter benzophenone-3 to scleractinian coral larvae. *Toxics*. doi:10.3390/toxics10050244.
- Monchanin, C. et al. (2025). Differing competitive hierarchies between scleractinian corals on natural reefs and recruits on artificial reefs. *Marine Ecology*.
- Wu, D.H. et al. (2025). The distribution, diversity, and indicator species of coral communities in the subtropical peninsula of southern China. *Ecology and Evolution*. doi:10.1002/ece3.72212.
- Huang, D. (2023). *Leptastrea gibbosa* and *Leptastrea magaloni*. IUCN Red List of Threatened Species.

Continue reading
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Last updated November 8, 2026
Written by
Blane Perun
Blane Perun has been exploring Earth’s oceans and marine life for over 25 years. Founder of TheSea.Org in 1999, underwater photographer, coral aquaculture pioneer, and explorer of 80+ countries.

[About Blane Perun →](/about-blane-perun/)