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n. pl.1.(Zool.) The division of Cetacea which comprises the dolphins, porpoises, and related forms.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Delphinoidea, especially closely related species, are challenging to distinguish from one another acoustically, and few studies have directly explored inter-specific variation (Steiner, 1981; Miller et al, 1995; Rendell et al, 1999; Baron et al, 2008; Gannier et al, 2010).
The tucuxi (Sotalia fluviatilis) belongs to the superfamily Delphinoidea, which includes all marine dolphins.