Lydeard, C., M. Mulvey & G.M. Davis. 1996. Molecular systematics and evolution of reproductive traits of North American freshwater unionacean mussels (Mollusca: Bivalvia) as inferred from 16S rRNA gene sequences. Philos. Trans. Roy. Soc. London (B, Biol. Sci.) 351: 1593-1603. Available electronically.
(click the figure number to see the cladogram)
+----- Cumberlandia_monodonta
+--------------------------+
| | +-- Margaritifera_margaritifera
| +--+
| +-- Margaritifera_falcata
|
| +----- Utterbackia_imbecillis
| +--+
| | | +-- Utterbackiana_couperiana
--+ | +--+
| +--------------------+ +-- Utterbackiana
| | |
| | | +----- Strophitus_radiatus
| | +--+
| | | +-- Lasmigona_costata
| | +--+
| | +-- Alasmidonta_triangulata
+--+
| +----- Megalonaias_nervosa
| +--------------------+
| | | +-- Quadrula_quadrula
| | +--+
| | +-- Theliderma_metanevra
| |
+--+ +----- Elliptoideus_sloatianus
| |
| +-----------------+ +-- Eurynia_dilatata
| | | |
| | +--+-- Pleurobema_pyriforme
| | |
+--+ +-- Uniomerus_carolinianus
|
| +-------------------- Amblema_plicata
| |
+--+ +-- Plectomerus_dombeyanus
| +--------------+
| | +-- Obliquaria_reflexa
+--+
| +-------------- Potamilus_fragilis
| |
+--+ +----------- Ptychobranchus_subtentus
| |
+--+ +-------- Medionidus_conradicus
| |
+--+ +----- Potamilus_purpuratus
| |
| | +-- Ellipsaria_lineolata
+--+--+
| +-- Villosa_delumbis
|
| +-- Lampsilis_teres
+--+
+-- Lampsilis_siliquoidea
+-------------------------------------------- None
|
| +----- Cumberlandia_monodonta
| +-----------------------------------+
| | | +-- Margaritifera_margaritifera
--+ | +--+
| | +-- Margaritifera_falcata
| |
| | +----- Utterbackia_imbecillis
| | +--+
| | | | +-- Utterbackiana_couperiana
+--+ | +--+
| +-----------------------------+ +-- Anodonta
| | |
| | | +----- Strophitus_radiatus
| | +--+
| | | +-- Lasmigona_costata
| | +--+
| | +-- Alasmidonta_triangulata
+--+
| +----- Megalonaias_nervosa
| +-----------------------------+
| | | +-- Quadrula_quadrula
| | +--+
| | +-- Theliderma_metanevra
| |
+--+ +-------- Elliptoideus_sloatianus
| +-----------------------+
| | | +----- Uniomerus_carolinianus
| | +--+
| | | +-- Eurynia_dilatata
+--+ +--+
| +-- Pleurobema_pyriforme
|
| +----------------------------- Amblema_plicata
+--+
| +-------------------------- Plectomerus_dombeyanus
+--+
| +----------------------- Obliquaria_reflexa
+--+
| +-------------------- Medionidus_conradicus
+--+
| +----------------- Ptychobranchus_subtentus
+--+
| +-------------- Potamilus_fragilis
+--+
| +----------- Potamilus_purpuratus
+--+
| +-------- Ellipsaria_lineolata
+--+
| +----- Villosa_delumbis
+--+
| +-- Lampsilis_teres
+--+
+-- Lampsilis_siliquoidea