Sinella, BROOK, 1882

Zhang, Feng, Qu, Ji-Qiang & Deharveng, Louis, 2010, Two syntopic and remarkably similar new species of Sinella and Coecobrya from South China (Collembola, Entomobryidae), Zoosystema 32 (3), pp. 469-477 : 473

KEY TO THE 3+3-EYED SPECIES OF SINELLA BROOK, 1882

1. Unguiculus with a clear tooth on outer edge .............................................................. 2

— Unguiculus smooth or serrate or with a tiny tooth on outer edge ............................... 4

2. Mucronal basal spine long reaching at least half way from tip of subapical tooth to tip of apical tooth; Abd. III with 2+2 central macrochaetae; eyes equally distant ..................... ............................................................................................................... S. wui , China

— Mucronal basal spine short, at most slightly exceeding tip of subapical tooth; eyes in two groups (2 anterior and 1 posterior) ............................................................................. 3

3. Abd. III with 1+1 central macrochaetae ......................................................................... .................................................... S. straminea sensu Wang & Christiansen 2000 , Japan

— Abd. III with 2+2 central macrochaetae ............................................. S. triocula , China

4. Dental smooth part more than 5 times mucro in length ............................................. 5

— Dental smooth part less than 4 times mucro in length ................................................ 6

5. Inner basal paired teeth of unguis at 50% from inner edge base .... S. hexophthalma , Chile

— Inner basal paired teeth of unguis at 65% from inner edge base ............. S. recens , USA

6. Abd. III with 3+3 central macrochaetae ............................................ S. sexoculata , USA

— Abd. III with 1+1 central macrochaetae ...................................................................... 7

7. Abd. IV with 3+3 central macrochaetae ......................... S. colorata n. sp., South China

— Abd. IV with 7+7 central macrochaetae ............................ S. pseudostraminea , Vietnam