Species boundaries in tintinnid ciliates: a case study--morphometric variability, molecular characterization, and temporal distribution of Helicostomella species (Ciliophora, Tintinnina).

Abstract excerpt

Tintinnids are a large group of planktonic ciliates with diverse morphologies. The range of variability in lorica shapes and sizes can be very high even within a single species depending on life stages and environmental conditions, which makes the delimitation of different species based on morphological criteria alone very difficult. Accordingly, comparisons of morphological and molecular variability in...

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