Alternative spellings: Arca (Larkinia), Larkinia
Parent taxon: Anadara according to J. A. Todd 2001
See also Coan et al. 2000, da Silva Forti 1969, Moore 1983, Pilsbry and Olsson 1941, Reinhart 1943, Sepkoski 2002 and Vokes 1980
Sister taxa: Anadara (Anadara), Anadara (Caloosarca), Anadara (Cunearca), Anadara (Diluvarca), Anadara (Esmerarca), Anadara (Grandiarca), Anadara (Lunarca), Anadara (Mabellarca), Anadara (Potiarca), Anadara (Rasia), Anadara (Sectiarca), Anadara (Tegillarca), Anadara (Tosarca), Anadara aequatorialis, Anadara aequicostata, Anadara baughmani, Anadara callicestosa, Anadara campsa, Anadara concinna, Anadara congesta, Anadara craticulata, Anadara crebricostata, Anadara cretacea, Anadara dasia, Anadara daviesi, Anadara fichteli, Anadara firmata, Anadara formosa, Anadara garoensis, Anadara gourae, Anadara guayubinica, Anadara halidonata, Anadara hermidermos, Anadara jacksoni, Anadara kroensis, Anadara macneili, Anadara magnoliana, Anadara molengraaffii, Anadara montereyana, Anadara mummi, Anadara nugax, Anadara nux, Anadara obesa, Anadara obliquidens, Anadara osmonti, Anadara panensis, Anadara perlabiata, Anadara preangerensis, Anadara prephina, Anadara protracta, Anadara quilonensis, Anadara reinharti, Anadara riogurabonica, Anadara santana, Anadara suboblonga, Anadara trilineata, Anadara tuberculosa, Anadara uropigimelana, Anadara woodringi, Arca (Anadara) heterosculpta
Subtaxa: Anadara (Larkinia) notabilis Anadara (Larkinia) sellardsi Anadara (Larkinia) transversa Larkinia camuloensis Larkinia grandis Larkinia larkinii Larkinia multicostata
Ecology: facultatively mobile epifaunal suspension feeder
Distribution:
• Quaternary of Brazil (3 collections), the Dominican Republic (3), Ecuador (4), Haiti (1), Mexico (3), Pakistan (1), Panama (1), Peru (4), United States (70: California, Florida, Georgia, Louisiana, Maryland, Massachusetts, Mississippi, New Jersey, New York, North Carolina, South Carolina, Virginia), Venezuela (3)
• Pliocene to Pleistocene of Ecuador (1), United States (1: Florida)
• Pliocene of Colombia (4), Costa Rica (2), Mexico (3), Pakistan (1), United States (9: California, Florida, North Carolina, South Carolina), Venezuela (8)
• Miocene of Colombia (12), Jamaica (1), Peru (5), United States (2: New Jersey), Venezuela (8)
Total: 150 collections including 154 occurrences