Clymene dolphin

Stenella clymene

Also known as: Helmet Dolphin, Atlantic Spinner Dolphin

LCLeast Concern

Clymene Dolphin is an Atlantic dolphin recognized by a three-part gray color pattern and dark line along the beak. It spins above the surface and hunts schooling fish and squid in deep tropical water. Gulf and Atlantic records are mostly offshore, and low totals reflect limited access as well as rarity of encounters. National occurrence records reveal where and when people have documented it, but they don't measure abundance or prove that an unreported area is empty.

US Range
Explore by state

Clymene dolphin across 3 states

Occurrence records, conservation status, and the places it turns up, state by state. Open a state for detail, or visit its full page.

IUCN Red List status

  1. LC
  2. NT
  3. VU
  4. EN
  5. CR
  6. EW
  7. EX

LC – Least Concern

Widespread and abundant; not at risk.

Elevation

From 73 georeferenced records, the Clymene dolphin is recorded from sea levelsea level to 17 m56 ft, with half of sightings below sea levelsea level.

Each band shows the share of georeferenced sightings that fall within it. Records cluster where people live and hike, so low, populated elevations are over-represented. Read this as observation density, not true abundance.

Best encounter

Where and when to see a Clymene dolphin

Your best chance: Florida.

Where
FloridaFL

Life history

The Clymene dolphin (75 kg165.3 lb) is a carnivore that first breeds around 5.3 years, carries a 319-day gestation, and bears about 1 young per litter. Maximum recorded longevity is 29 years.

Life cycle

  1. Gestation319 days (≈10.5 months)
  2. Birthlitter of 1 young
  3. Sexual maturity5.3 yr (female) · 10 yr (male)
  4. Typical lifespan29 years
  5. Maximum recorded longevity29 years

Reproduction

Gestation
319days≈10.5 months
Litter size
1youngaverage
Litters / year
0.42littersabout one every 2.4 years
Age at first breeding
5.3years♀ 5.3 · ♂ 10 yr

Diet composition

Carnivore

By foraging composition: 60% invertebrates, 40% fish.

  • Invertebrates60%
  • Fish40%

Most active around the clock.

Typical values for the species, not local measurements. Maximum longevity is the longest lifespan on record; most individuals live far less.

Commonly confused with

Animals people sometimes mistake for the clymene dolphin, and how to tell them apart.

How to recognize the Clymene Dolphin

Clymene Dolphin is an Atlantic dolphin recognized by a three-part gray color pattern and dark line along the beak. Field identification still depends on the whole animal, its behavior, and location because a quick glimpse can hide useful features.

Clymene Dolphin behavior and habitat

It spins above the surface and hunts schooling fish and squid in deep tropical water. Habitat must connect feeding areas with secure places to rest, shelter, or raise young. That link explains why a broad outline can contain large areas the species doesn’t regularly use.

Understanding the United States record

Gulf and Atlantic records are mostly offshore, and low totals reflect limited access as well as rarity of encounters. Reports depend on access, survey methods, and correct identification. A cluster doesn’t measure population size, and a blank area doesn’t prove absence. Repeated surveys are needed to separate real biological change from changes in reporting.

Conservation in context

Wide-ranging species can face very different pressures across their distribution. Protecting feeding habitat, travel routes, and undisturbed shelter addresses the parts of the landscape they actually need. Global conservation categories don’t replace local monitoring.

Data & sources

The data and visualizations on this page draw on these open sources:

  • GBIFCC-BY 4.0occurrence records behind the range map, elevation, and record counts
  • PhyloPicCC0 / CC-BY per itemthe to-scale silhouettesAndrew A. Farke (human silhouette, CC-BY 3.0)
  • AnAge (HAGR)CC-BY 3.0longevity, maturity, and gestation figures
  • IUCN Red Listattributed factthe global conservation status
  • Amniote Life-History DatabaseCC0 · public domainreproduction figures
  • EltonTraitsCC0 · public domaindiet and foraging-activity data