Reptilia · Squamata
Conopsis nasusGünther, 1858
Largenose Earth Snake
Photograph by Oscar Alejandro Morales Juárez, CC BY-SA, via iNaturalist
A burrowing, dawn-and-dusk, meat-eating snake from the Nearctic region, reaching 385 mm nose to tail.
Reptilia › Squamata › Colubridae › Conopsis
- Grows to
- 385mm
- greatest recorded
- Eats
- Carnivorous
- Active
- Crepuscular
- Lives
- Cryptic, fossorial
Longer than only 18% of all colubrid snakes 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 98 to 3,800 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
36 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
- 2007
- Population trend
- Stable
The animal itself
- Limbs
- None
- Pupil
- Round
- Fangs
- At the back of the mouth
Size
- Length snout to vent · greatest recorded
- 320mm12.5 in
- Length snout to vent · adult female mean
- 270mm10.5 in
- Length nose to tail · greatest recorded
- 385mm15 in
- Hatchling length · snout to vent
- 88.6mm3.5 in
- Body mass · greatestcomputed
- 13.44g0.47 oz
- Body mass · adult female, meanmeasured
- 12.1g0.43 oz
- Body mass at hatchingmeasured
- 0.9g0.03 oz
385 mm total length (Feldman et al. 2016), adult female 157.8 mm SVL (Berriozabal-Islas et al. 2022; n = 1), Raya-Garcia et al. 2016 (neonates 77.3-100 mm SVL, 0.6-1.2 g; mother 270 mm SVL, body mass of 16.9 g before parturition and 12.1 g ater. ), Goyenechea and Flores-Villela 2006 ("Adult specimens of Conopsis nasus average 202.1 mm snout-vent length (100–320 mm), 238.1 mm in total length (120–385 mm),")
snakes only in this source
computed from length by a family-level allometric equation, not weighed
How it lives
- Diet
- Carnivorous
- How it hunts
- Sit and wait
- Active
- Crepuscular
- Where it lives
- Cryptic, fossorial
- Habitat
- Forest, Grassland, Shrubland
- Biome
- Tropical & Subtropical Coniferous Forests
- Active season · months of the year
- 12months
- Region
- Nearctic
- Mainland or island
- Mainland
- Elevation · above sea level
- 1500–3000m
- Range size
- 297,856km²
Hard-bodied invertebrates (Ramirez et al. 2023)
Sit (Hernandez-Salinas et al. 2023)
Hernandez-Salinas et al. 2023
Fossorial (Feldman 2015, Raya-Garcia et al. 2016), cryptic (Goyenechea and Flores-Villela 2006)
1500-3000 (Berriozabal-Islas et al. 2022), 1515-2950 (Goyenechea and Flores-Villela 2006)
Breeding
- Reproduction
- Viviparous
- Average clutch
- 11eggs
- Eggs or young per clutch
- 1–11eggs
- Mean clutch
- 3.6eggs
(Feldman et al., 2015, Raya-Garcia et al. 2016), may be oviparous (Heimes 2016)
mean 11 (Meiri et al. 2019, it is probably based on n = 1, see Raya-Garcia et al. 2016), 1-6 (Heimes 2016), Raya-Garcia et al. 2016 (1-11, mean 3.6)
Naming and history
- Suborder
- Serpentes
- Infraorder
- Alethinophidia
- Subspecies
- Conopsis nasus nasus GÜNTHER 1858 Conopsis nasus labialis TANNER 1961
- Described by
- Günther
- Moved to another genus · since it was first described
- Yes
- Described in
- 1858
- Type locality
- Mexico
Keeping one
15 in × 7.5 in × 11.5 in(39 × 19 × 29 cm)
Minimum length × width × height, for one animal. Bigger is always better. Substrate at least 7.5 in (19 cm) deep.
The standard sizes snakes as a fraction of total length: 1 × 0.5 × 0.75.
Burrows, so substrate deep enough to dig in matters as much as floor area.
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 15 in (385 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 Largenose Earth 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.
2kJ per day
Worked out for an animal of 13 g, the heaviest recorded for Largenose Earth 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 · snout to vent
- — Largest male · snout to vent
- — 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
- — 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 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
- — Venomous
- — 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
- — Red List criteria
- — Density · lowest recorded
- — Density · highest recorded
- — Home range · largest recorded
- — Active in
Others in Colubridae
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). Conopsis nasus. Retrieved 2026-09-08, from https://www.allanglescreatures.com/species/conopsis-nasus
@misc{conopsis_nasus_2026,
title = {Conopsis nasus},
author = {{The Reptile & Amphibian Encyclopedia}},
year = {2026},
url = {https://www.allanglescreatures.com/species/conopsis-nasus}
}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.