Key for separation of crawlers of known Stigmacoccus species

1. Anal opening surrounded by a double ring of short, tubercle-like pores; submarginal tubular pores on venter clearly more than twice size of smallest submedial tubular pores ...................................... S. garmilleri

- Anal opening surrounded by only 1 ring of short, tubercle-like pores; ventral submarginal tubular pores only slightly larger than smallest submedial tubular pores ........................................................................ 2

2. With 0 or 1 spine on margin of abdominal segments I and II, 3 or fewer spines on each side of segments III and IV and 6–11 on margin of segment V ........................................................................ S. paranaensis

- With 1–4 spines on abdominal segment I (rarely 0), 4–11 on segments II–IV and 8–14 on segment V ...... .......................................................................................................................................................... S. asper