Dolphins with characteristic beak:

Common Dolphin - Delphinus Delphis
Northern Rightwhale Dolphin - Lissodelphis Borealis
Southern Rightwhale Dolphin - Lissodelphis Peronii
Tucuxi Dolphin - Sotalia Fluviatilis
Indo-Pacific Humpback Dolphin - Sousa Chinensis
Atlantic Humpbacked Dolphin - Sousa Teuszii
Striped Dolphin - Stenella Coeruleoalba
Short-snouted Spinner Dolphin - Stenella Clymene
Long-snouted Spinner Dolphin - Stenella Longirostris
Pantropical Spotted Dolphin - Stenella Attenuata
Atlantic Spotted Dolphin - Stenella Frontalis
Rough Toothed Dolphin - Steno Bredanensis
Bottlenose Dolphin - Tursiops Truncatus

Dolphins without characteristic beak:

Commerson's Dolphin - Cephalorhynchus Commersonii
Black Dolphin - Cephalorhynchus Eutropia
Heaviside's Dolphin - Cephalorhynchus Beavisidii
Hector's Dolphin - Cephalorhynchus Hectori
Risso's Dolphin - Grampus Griseus
Fraser's Dolphin - Lagenodelphis Bosei
Atlantic White-sided Dolphin - Lagenorhynchus Acutus
White-beaked Dolphin - Lagenorhynchus Albirostris
Peale's Dolphin - Lagenorhynchus Australis
Hourglass Dolphin - Lagenorhynchus Cruciger
Pacific Whitesided Dolphin - Lagenorhynchus Obliquidens
Dusky Dolphin - Lagenorhynchus Obscurus
Irrawaddy Dolphin - Orcaella Brevirostris