FIGURE 6. Sepedonella nana. A, B, anterior spiracle. A in Biology of the Afrotropical Sepedonella nana (Diptera: Sciomyzidae), whose larvae feed only on freshwater Aulophorus furcatus (Oligochaeta: Naididae)

FIGURE 6. Sepedonella nana. A, B, anterior spiracle. A, second instar; B, third instar. C–F, first instar abdominal segments. C, dorsal subdivision in three transversal bands (bt1-bt3) of abdominal segment 1 (ab1); D, dorsolateral view of abdominal segments 6 and 7 showing mainly lateral tubercles (lt1-lt3) and placements of sensilla; E, disposition of the three ventral tubercles (vt1-vt3) on an abdominal hemi-segment; F, enlargement of ventral tubercle vt2 showing an apparent additional sensillum due to exceptional arrangement of some cuticular expansions (arrow) delimiting the ventral tubercle. ab1, ab6, ab7, ab8, abdominal segments 1, 6, 7; as, anterior spiracle; bt1-3, transversal band 1–3; lt1-3, lateral tubercles 1–3; mb, membrane; pa, papilla; ss, stigmatic scar; sw t, swimming tuft; vt1-vt3, ventral tubercles 1–3; Arabic numbers, number affected to each sensillum.