1. Small Cetaceans of theSmall Cetaceans of the
World:World:
An OverviewAn Overview
Thomas A. JeffersonThomas A. Jefferson
Clymene Enterprises/CetosClymene Enterprises/Cetos
Research OrganizationResearch Organization
2. Small Cetaceans of the WorldSmall Cetaceans of the World
Family KogiidaeFamily Kogiidae ““Mini” sperm whales - 2Mini” sperm whales - 2
Family MonodontidaeFamily Monodontidae Arctic whales - 2Arctic whales - 2
Family ZiphiidaeFamily Ziphiidae Beaked whales - 21Beaked whales - 21
Family DelphinidaeFamily Delphinidae Ocean dolphins - 36Ocean dolphins - 36
Family PhocoenidaeFamily Phocoenidae Porpoises - 7Porpoises - 7
Family PlatanistidaeFamily Platanistidae S Asian river dolphin - 1S Asian river dolphin - 1
Family IniidaeFamily Iniidae Amazon River dolphin - 1Amazon River dolphin - 1
Family PontoporiidaeFamily Pontoporiidae Franciscana - 1Franciscana - 1
3. ‘‘Mini’ Sperm WhalesMini’ Sperm Whales
2 species, with largely-overlapping distributions2 species, with largely-overlapping distributions
Very poorly-known - most knowledge comes fromVery poorly-known - most knowledge comes from
strandingsstrandings
Very often confused and misidentifiedVery often confused and misidentified
Commonly stranded in some areas of the worldCommonly stranded in some areas of the world
4. Beluga/NarwhalBeluga/Narwhal
2 species (Arctic only)2 species (Arctic only)
Live among the ice floes (Climate change???)Live among the ice floes (Climate change???)
Both species heavily hunted by nativesBoth species heavily hunted by natives
5. Beluga whaleBeluga whale -- DelphinapterusDelphinapterus
Single speciesSingle species
Also known as white whale, though young are grayAlso known as white whale, though young are gray
Another name is ‘sea canary’Another name is ‘sea canary’
Population in Cook Inlet is endangered and heavilyPopulation in Cook Inlet is endangered and heavily
managed by NMFSmanaged by NMFS
6. NarwhalNarwhal -- MonodonMonodon
Single speciesSingle species
Only species with protruding tuskOnly species with protruding tusk
Source of the unicorn mythSource of the unicorn myth
Maybe the first cetacean victim of global warmingMaybe the first cetacean victim of global warming
7. Beaked WhalesBeaked Whales
21 species21 species
Most poorly-known group of large mammals in the worldMost poorly-known group of large mammals in the world
Currently intensively studied (due to Navy impacts)Currently intensively studied (due to Navy impacts)
But, still largely mysterious (due to inconspicuous,But, still largely mysterious (due to inconspicuous,
oceanic habits)oceanic habits)
8. Baird’s and Arnoux’s beakedBaird’s and Arnoux’s beaked
whaleswhales -- BerardiusBerardius
2 species2 species
Largest beaked whalesLargest beaked whales
Occur in large, tight groupsOccur in large, tight groups
Baird’s hunted in Japanese watersBaird’s hunted in Japanese waters
Arnoux’s VERY poorly knownArnoux’s VERY poorly known
9. Bottlenose whalesBottlenose whales --HyperoodonHyperoodon
2 species (northern and southern)2 species (northern and southern)
Northern b w maybe best-studied beaked whaleNorthern b w maybe best-studied beaked whale
Supported direct fisheries in E Canada and EuropeanSupported direct fisheries in E Canada and European
waterswaters
First beaked whales to be subject of focal ecologicalFirst beaked whales to be subject of focal ecological
studiesstudies
10. ‘‘Mesoplodonts’Mesoplodonts’ -- MesoplodonMesoplodon
14-15 species (very diverse)14-15 species (very diverse)
Males use protruding tusks in competition for femalesMales use protruding tusks in competition for females
Some species only known from a few specimensSome species only known from a few specimens
Blainville’s b w is now reasonably well-studied (mostly HIBlainville’s b w is now reasonably well-studied (mostly HI
and Bahamas)and Bahamas)
11. Cuvier’s beaked whale -Cuvier’s beaked whale - ZiphiusZiphius
Single species (cosmopolitan)Single species (cosmopolitan)
Known to be capable of very deep dives (at leastKnown to be capable of very deep dives (at least
87 min, 1,752 m)87 min, 1,752 m)
Currently of great interest to US Navy, due toCurrently of great interest to US Navy, due to
sonar impactssonar impacts
12. Longman’s & Shepherd’s beakedLongman’s & Shepherd’s beaked
whales -whales - Indopacetus/TasmacetusIndopacetus/Tasmacetus
Single species in each genusSingle species in each genus
Indo-Pacific (Longman’s) and Southern HemisphereIndo-Pacific (Longman’s) and Southern Hemisphere
(Shepherd’s)(Shepherd’s)
External appearance unknown until last few yearsExternal appearance unknown until last few years
Shepherd’s b w is the only one with a mouth full of teethShepherd’s b w is the only one with a mouth full of teeth
Longman’s b w occurs in fairly large schoolsLongman’s b w occurs in fairly large schools
13. Oceanic DolphinsOceanic Dolphins
36 species (very diverse)36 species (very diverse)
Both long-beaked and blunt-headed speciesBoth long-beaked and blunt-headed species
Mostly occur in medium to large schoolsMostly occur in medium to large schools
Most species are oceanic, but some are coastalMost species are oceanic, but some are coastal
14. ‘‘Snubfin’ DolphinsSnubfin’ Dolphins -- OrcaellaOrcaella
2 species (Irrawaddy and Aus snubfin dolphins)2 species (Irrawaddy and Aus snubfin dolphins)
Found only in N Australia and E AsiaFound only in N Australia and E Asia
Very coastal in natureVery coastal in nature
Highly flexible neck (unusual for a cetacean)Highly flexible neck (unusual for a cetacean)
15. Killer whaleKiller whale -- OrcinusOrcinus
Single speciesSingle species
But wait a minute… taxonomy about to explodeBut wait a minute… taxonomy about to explode
Highly diverse, largely based around local preyHighly diverse, largely based around local prey
specializationspecialization
Found virtually everywhere there is water connected toFound virtually everywhere there is water connected to
the oceans (most cosmopolitan marine mammal)the oceans (most cosmopolitan marine mammal)
16. Pilot whalesPilot whales -- GlobicephalaGlobicephala
2 species (short- and long-finned)2 species (short- and long-finned)
One is antitropical and one is tropical/warm temperateOne is antitropical and one is tropical/warm temperate
Unique body shape with globose head and dorsal finUnique body shape with globose head and dorsal fin
near the headnear the head
Most famous ‘mass strander’Most famous ‘mass strander’
17. False killer whaleFalse killer whale -- PseudorcaPseudorca
Single speciesSingle species
Worldwide dist (not found in high latitudes)Worldwide dist (not found in high latitudes)
Occasionally preys on other marine mammals (mostlyOccasionally preys on other marine mammals (mostly
dolphins)dolphins)
Hawaiian island-associated population recently listed asHawaiian island-associated population recently listed as
Endangered on US ESLEndangered on US ESL
18. Pygmy and melon-headedPygmy and melon-headed
whaleswhales -- FeresaFeresa//PeponocephalaPeponocephala
2 species2 species
Tropical, oceanic speciesTropical, oceanic species
Very similar in external appearance, so much confusionVery similar in external appearance, so much confusion
FeresaFeresa occur in small groups andoccur in small groups and PeponocephalaPeponocephala inin
large oneslarge ones
19. Estuarine dolphinsEstuarine dolphins -- SotaliaSotalia
2 species (tucuxi and Guiana dolphins)2 species (tucuxi and Guiana dolphins)
Recently split (tucuxi in Amazon River andRecently split (tucuxi in Amazon River and
Guiana dolphin in coastal waters of S AmericaGuiana dolphin in coastal waters of S America
[and Orinoco?])[and Orinoco?])
Look a bit like little bottlenose dolphinsLook a bit like little bottlenose dolphins
20. Humpback dolphinsHumpback dolphins -- SousaSousa
2 species currently (I-P and Atlantic)2 species currently (I-P and Atlantic)
Taxonomy is confused - probably at least 4 speciesTaxonomy is confused - probably at least 4 species
Found throughout the rim of the Indian Ocean and WFound throughout the rim of the Indian Ocean and W
Pacific, and off W AfricaPacific, and off W Africa
Only reasonably well studied in S Africa and ChineseOnly reasonably well studied in S Africa and Chinese
waterswaters
21. Rough-toothed dolphinRough-toothed dolphin -- StenoSteno
Single speciesSingle species
Pantropical distributionPantropical distribution
‘‘Reptilean’ appearance, and sloping melonReptilean’ appearance, and sloping melon
Probaby very deep diversProbaby very deep divers
Appear to be highly intelligent and creativeAppear to be highly intelligent and creative
22. ‘‘Plowshare-headed’ dolphinsPlowshare-headed’ dolphins
-- LagenorhynchusLagenorhynchus
6 species (cold temperate waters - antitropical)6 species (cold temperate waters - antitropical)
Best known are Pacific WS and dusky dolphinsBest known are Pacific WS and dusky dolphins
All have very short beaks and robust bodiesAll have very short beaks and robust bodies
Probably going to be split in the futureProbably going to be split in the future
Most species not very well studiedMost species not very well studied
23. Bottlenose dolphins -Bottlenose dolphins - TursiopsTursiops
2 species (worldwide)2 species (worldwide)
But there are probably other species as wellBut there are probably other species as well
The best-known dolphin in the worldThe best-known dolphin in the world
Highly diverse with many local adaptationsHighly diverse with many local adaptations
Most common dolphin species in captivity and on TV/inMost common dolphin species in captivity and on TV/in
moviesmovies
24. Risso’s dolphinRisso’s dolphin -- GrampusGrampus
Single speciesSingle species
Found in most areas, but prefer continental slope areaFound in most areas, but prefer continental slope area
Adults are covered in scratches, scrapes, and scarsAdults are covered in scratches, scrapes, and scars
Easily identifiable, but very few ecological studies haveEasily identifiable, but very few ecological studies have
been donebeen done
25. ‘‘Stenellids’Stenellids’ -- StenellaStenella
5 species (mostly tropical)5 species (mostly tropical)
Another heterogeneous grouping?Another heterogeneous grouping?
Spinner dolphins probably best-known species of genusSpinner dolphins probably best-known species of genus
Millions of dolphins of this genus killed in ETP tunaMillions of dolphins of this genus killed in ETP tuna
fishery since 1960sfishery since 1960s
26. Common dolphinsCommon dolphins -- DelphinusDelphinus
2 species (short- and long-beaked)2 species (short- and long-beaked)
Taxonomy split in 1994Taxonomy split in 1994
Mostly temperate, although they do occur in tropicsMostly temperate, although they do occur in tropics
Not necessarily all that common in many areas of theNot necessarily all that common in many areas of the
world, esp. equatorial areasworld, esp. equatorial areas
27. Fraser’s dolphinFraser’s dolphin -- LagenodelphisLagenodelphis
Single speciesSingle species
Recently discovered (1956) - external appearance onlyRecently discovered (1956) - external appearance only
described in 1973described in 1973
Short beak, and very small appendagesShort beak, and very small appendages
Still very poorly-known speciesStill very poorly-known species
28. Right whale dolphinsRight whale dolphins--LissodelphisLissodelphis
2 species (N and S)2 species (N and S)
Occur in cold temperate watersOccur in cold temperate waters
Unique appearance (eel-like and no dorsal fin)Unique appearance (eel-like and no dorsal fin)
Very poorly-known speciesVery poorly-known species
One of Tom’s absolute favoritesOne of Tom’s absolute favorites
29. S HemisphereS Hemisphere dolphins -dolphins -
CephalorhynchusCephalorhynchus
4 species (all coastal, restricted ranges)4 species (all coastal, restricted ranges)
Smallest of the dolphinsSmallest of the dolphins
Short beak, and robust bodiesShort beak, and robust bodies
Several species/populations threatened (e.g., Hector’s,Several species/populations threatened (e.g., Hector’s,
Maui’s, Chilean, etc.)Maui’s, Chilean, etc.)
30. PorpoisesPorpoises
7 species (mostly in colder waters)7 species (mostly in colder waters)
Tend to be shy and elusiveTend to be shy and elusive
Small and not as social as dolphinsSmall and not as social as dolphins
Suffer universal problems with gillnetsSuffer universal problems with gillnets
31. ‘‘Common’ porpoisesCommon’ porpoises -- PhocoenaPhocoena
4 species (2 NH and 2 SH)4 species (2 NH and 2 SH)
Mostly relatively coastalMostly relatively coastal
Harbor porpoise is the best-known porpoise speciesHarbor porpoise is the best-known porpoise species
Spectacled porpoise is the least…Spectacled porpoise is the least…
Vaquita is the most endangered cetaceanVaquita is the most endangered cetacean
32. Dall’s porpoiseDall’s porpoise -- PhocoenoidesPhocoenoides
Single speciesSingle species
N Pacific endemicN Pacific endemic
Largest porpoise speciesLargest porpoise species
Previously caught in N Pacific driftnet fisheriesPreviously caught in N Pacific driftnet fisheries
Fast and energetic bowridersFast and energetic bowriders
33. Finless porpoisesFinless porpoises -- NeophocaenaNeophocaena
2 species2 species
Indo-Pacific and narrow-ridged - recently splitIndo-Pacific and narrow-ridged - recently split
Only found in Asian/Indian Ocean watersOnly found in Asian/Indian Ocean waters
Almost completely unstudied in most areas of rangeAlmost completely unstudied in most areas of range
Lots of local adaptation and many different populationsLots of local adaptation and many different populations
34. River DolphinsRiver Dolphins
3 living species (tropical/temperate regions)3 living species (tropical/temperate regions)
4th species (baiji) was declared extinct in 20064th species (baiji) was declared extinct in 2006
Represent several ancient lineages (not related)Represent several ancient lineages (not related)
All have long beaks and lumpy bodiesAll have long beaks and lumpy bodies
35. South Asian River dolphin -South Asian River dolphin -
PlatanistaPlatanista
Single species (but used to be two)Single species (but used to be two)
Occur in Ganges/Brahmaputra and Indus basinsOccur in Ganges/Brahmaputra and Indus basins
Very bizarre appearance (teeth protrude in oldVery bizarre appearance (teeth protrude in old
individuals)individuals)
Indus bhulan threatened with extinctionIndus bhulan threatened with extinction
36. BotoBoto - Inia- Inia
Single speciesSingle species
South America (Amazon River)South America (Amazon River)
Taxonomy currently being revisedTaxonomy currently being revised
Forest dolphin, they can actually swim among treesForest dolphin, they can actually swim among trees
Only dolphin with differentiated teeth (molar-like teeth)Only dolphin with differentiated teeth (molar-like teeth)
37. Franciscana -Franciscana - PontoporiaPontoporia
Single speciesSingle species
Found along E coast of S AmericaFound along E coast of S America
Only ‘river dolphin’ that does not live in riversOnly ‘river dolphin’ that does not live in rivers
Heavy gillnet mortality and some populations threatenedHeavy gillnet mortality and some populations threatened
Subject of many recent studiesSubject of many recent studies
38. ConclusionsConclusions
Wow… there sure are a heck of a lot of speciesWow… there sure are a heck of a lot of species
of small cetaceans!!of small cetaceans!!
The delphinids have become a taxonomic ‘trashThe delphinids have become a taxonomic ‘trash
basket’ - lots of diverse species lumpedbasket’ - lots of diverse species lumped
together.together.
Most of the World’s most endangered cetaceanMost of the World’s most endangered cetacean
species are small cetaceans, NOT great whales.species are small cetaceans, NOT great whales.
Many species and populations are trouble, oftenMany species and populations are trouble, often
in large part due to lack of knowledge/interest.in large part due to lack of knowledge/interest.
We need to focus much more attention on theseWe need to focus much more attention on these
animals to avoid serious losses of cetaceananimals to avoid serious losses of cetacean
biodiversity…biodiversity…