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14(13). Respiratory siphon non retractile, usually long and thin, sometimes relatively short; all tarsi (Ta) 1-segmented; hind tibiae (T) simple
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-Respiratory siphon retractile, short and strap-like, often apices visible; fore tarsi (Ta) 1- or 3-segmented (basal segment very small so may appear 2-segmented); mid and hind tarsi 3-segmented (basal segment very small); hind tibiae (T) usually flattened, with swimming hairs (H)
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