Reptilia · Squamata
Myron richardsoniiGray, 1849
Richardson’s mangrove snake
No photograph of this species exists under a license anyone may reuse. It gets the same page regardless.
A water-living, nocturnal, meat-eating snake from the Australo-Pacific region, reaching 600 mm nose to tail.
Reptilia › Squamata › Homalopsidae › Myron
- Grows to
- 600mm
- greatest recorded
- Eats
- Carnivorous
- Active
- Nocturnal
- Lives
- Aquatic
Longer than only 38% of all species in Homalopsidae anyone has measured.
The bar is the rank itself: its length is the share of the family this animal exceeds. The chart below is the family’s real spread, on a logarithmic scale because body length here runs from 128 to 1,400 mm. The solid rule is this animal. Every bar is a count of real species, and nothing on this figure is estimated.
What is known
35 sourced facts, each taken from a named scientific dataset. How to read these.
Cited from a dataset unless a row is marked otherwise.
Standing in the world
- Still living
- Extant
- Conservation status
- Least Concern
- Status assessed · the year the Red List last looked
- 2009
The animal itself
- Limbs
- None
- Pupil
- Vertical slit
- Venomous
- Yes
- Fangs
- At the back of the mouth
Size
- Length snout to vent · greatest recorded
- 370mm14.5 in
- Length snout to vent · adult female mean
- 310mm12 in
- Length nose to tail · greatest recorded
- 600mm23.5 in
- Largest female · snout to vent
- 261mm10.5 in
- Largest male · snout to vent
- 310mm12 in
- Hatchling length · snout to vent
- 104mm4 in
- Body mass · greatestcomputed
- 105.1g3.7 oz
- Body mass at hatchingmeasured
- 0.41g0.01 oz
600 mm total length (Feldman et al. 2016), Shine 1994 (4 males 20.7-29.4, mean 26.1 cm SVL; 5 females 25.5-37, mean 31 cm SVL; hatchling SVL 104 mm, see also Shine 1991)
snakes only in this source
snout-vent length; the source column mixes this with straight carapace length
largely converted from length by allometry in the source
How it lives
- Diet
- Carnivorous
- Active
- Nocturnal
- Where it lives
- Aquatic
- Habitat
- Wetlands
- Biome
- Tropical & Subtropical Grasslands, Savannas & Shrublands
- Region
- Australo-Pacific
- Mainland or island
- Mainland
- Highest it lives · above sea level
- 10m
- Range size
- 202,050km²
a fish (Shine 1994, n = 1), fish (Shine 1991)
Shine 1991
O'Shea 2018
sea level (O'Shea 2018)
Breeding
- Reproduction
- Viviparous
- Average clutch
- 6eggs
- Eggs or young per clutch
- 6–8eggs
- Mean clutch
- 6eggs
Feldman et al. 2015
mean 6 (Meiri et al. 2019), 6-8 (Murphy 2007, O'Shea 2018), 6 n=1 (Shine 1991), Shine 1994 (6, n = 1)
Naming and history
- Suborder
- Serpentes
- Infraorder
- Alethinophidia
- Subspecies
- No
- Described by
- Gray
- Moved to another genus · since it was first described
- No
- Described in
- 1849
- Type locality
- Australia
Keeping one
23.5 in × 12 in × 17.5 in(60 × 30 × 45 cm)
Minimum length × width × height, for one animal. Bigger is always better.
The standard sizes snakes as a fraction of total length: 1 × 0.5 × 0.75.
Spends time in water, so a water area is part of the enclosure rather than a dish.
Mindestanforderungen an die Haltung von Reptilien (Sachverständigengutachten), German Federal Ministry for Nutrition, Agriculture and Forestry, Animal Welfare Division, 10 January 1997. The standard states these floor areas are recommendations rather than binding limits.
From this animal’s own total length of 23.5 in (600 mm), at 1 × 0.5 × 0.75 times it, following the German federal welfare standard — how this is worked out.
No preferred body temperature has been recorded for Richardson’s mangrove snake. Rather than repeat a number from a care sheet, this page leaves it out.
Feeding
A prey item should be between the same width as the widest part of the snake's body and about 1.5 times that width.
Widely used across snake husbandry references. An alternative formulation gives prey at 10-15% of the snake's body mass. This is established practice, not a measurement.
12kJ per day
Worked out for an animal of 105 g, the heaviest recorded for Richardson’s mangrove snake — so it is the top of the range, not a figure for a particular animal. Weigh yours and the number will be lower.
An upper estimate, not a feeding target, and not veterinary advice. The equation covers only what an animal burns staying alive, so a growing, gravid or recovering animal needs more — and it was measured on wild animals, which move far more than one in an enclosure. Body condition and a vet who knows the species are what a feeding decision should rest on. Where this comes from.
What nobody knows
These are not gaps in our research. No scientific dataset records them for this species — and saying so is information you cannot get from a reference that simply leaves a field out.
- — Length snout to vent · adult male mean
- — Length snout to vent · adult mean
- — Female length · mean, nose to tail
- — Length nose to tail · adult male mean
- — Length nose to tail · adult mean
- — Largest female · shell length
- — Largest male · shell length
- — Hatchling length · nose to tail
- — Largest juvenile · snout to vent
- — Largest juvenile · shell length
- — Egg length
- — Egg width
- — Body mass · a typical adult
- — Body mass · adult female, mean
- — Longest recorded life
- — Preferred body temperature · chosen in a laboratory gradient
- — Body temperature when active · measured in the wild
- — Eats arthropods
- — Eats vertebrates
- — Eats plant matter
- — How it hunts
- — How the young develop
- — Gestation or incubation
- — Clutches in a year
- — Clutches a year · fewest
- — Clutches a year · most
- — First breeds from · youngest recorded
- — First breeds by · oldest recorded
- — Hatchling length · smallest recorded
- — Hatchling length · largest recorded
- — Age at first breeding · female
- — Mature from · youngest recorded
- — Mature by · oldest recorded
- — Size at maturity · smallest recorded
- — Size at maturity · largest recorded
- — Body temp in the wild · lowest mean recorded
- — Body temp in the wild · highest mean recorded
- — Colour on the back
- — Pattern on the back
- — Sex decided by
- — Population trend
- — Red List criteria
- — Active season · shortest recorded
- — Active season · longest recorded
- — Density · lowest recorded
- — Density · highest recorded
- — Home range · largest recorded
- — Active in
- — Lowest it lives · above sea level
Others in Homalopsidae
Take this data
Everything on this page is available as data under CC BY 4.0 — use it freely, credit it, no permission needed.
This species as JSON · the whole dataset
Cite this page
The Reptile & Amphibian Encyclopedia (2026). Myron richardsonii. Retrieved 2026-09-08, from https://www.allanglescreatures.com/species/myron-richardsonii
@misc{myron_richardsonii_2026,
title = {Myron richardsonii},
author = {{The Reptile & Amphibian Encyclopedia}},
year = {2026},
url = {https://www.allanglescreatures.com/species/myron-richardsonii}
}Sources
- Meiri, S. (2024). SquamBase — a database of squamate (Reptilia: Squamata) traits. Global Ecology and Biogeography. Public domain (CC0).
- Oskyrko, O. et al. (2024). ReptTraits: a comprehensive dataset of ecological traits in reptiles. Scientific Data. Used under CC BY 4.0.
- Catalogue of Life (dataset 3LR), used under CC BY.