Stempellinella, Ekrem, 2007

Ekrem, Torbjørn, 2007, A taxonomic revision of the genus Stempellinella (Diptera: Chironomidae), Journal of Natural History 41 (21 - 24), pp. 1367-1465 : 1460-1461

publication ID	https://doi.org/ 10.1080/00222930701437360
persistent identifier	https://treatment.plazi.org/id/CD7F7062-6B53-FFDC-FE1A-055587B9FA35
treatment provided by	Felipe
scientific name	Stempellinella
status

Treatment

Key to known Stempellinella View in CoL View at ENA larvae

The larva of Zavrelia pentatoma is included in the key since it is quite similar to some Stempellinella species. The larvae of Stempellinella apicula , S. brevilamellae , S. coronata , S. distincta , S. lamellata , S. reissi , S. sublettorum , and S. tamaseptima remain unknown.

1. Premandible with three or four teeth ( Figure 22G View Figure 22 )......... 2

– Premandible with two teeth ( Figure 6G View Figure 6 )............ 8

2. Premandible with four teeth and spur on antennal pedestal straight, pointed and postoccipital plate well developed continuous...... Zavrelia pentatoma View in CoL

– If premandible with four teeth, spur on antennal pedestal digitiform and strongly bent and postoccipital plate split ( Figure 16D, G, I View Figure 16 )......... 3

3. Spur on antennal pedestal long, digitiform, strongly bent; premandible with three or four teeth ( Figure 30D, G View Figure 30 )............... 4

– Spur on antennal pedestal moderately developed, blunt, not strongly bent; premandible with three teeth ( Figure 14D, F View Figure 14 )........... 5

4. Premandible with four teeth; antennal blade extending beyond apex of distal Lauterborn organ ( Figure 16D View Figure 16 ); Nearctic region....... S. fimbriata View in CoL

– Premandible with three teeth; antennal blade barely reaching apex of distal Lauterborn organ ( Figure 30D View Figure 30 ); South Africa........ S. truncata

5. Clypal seta S3 split in three or more branches; ventromental plate with broad anterior rim; postoccipital plate split ( Figure 8E, F, I View Figure 8 )........ 6

– Clypal seta S3 simple; ventromental plate with narrow anterior rim; postoccipital plate narrow, continuous ( Figure 22E, F, I View Figure 22 )........... 7

6. Clypal seta S3 split in three branches; body length, 1.5 mm; AR lower than 0.75 ( Figure 22D, E View Figure 22 ); widely distributed in the southern hemisphere. S. chambiensis

– Clypal seta S3 split in two long and several small branches; body length. 2 mm; AR higher than 0.8 ( Figure 3D, E View Figure 3 ); Nearctic region....... S. boltoni View in CoL

7. Ventromental plate with strong median projection ( Figure 14E View Figure 14 ); Holarctic region................... S. edwardsi View in CoL

– Ventromental plate with weak median projection ( Figure 22F View Figure 22 ); Nearctic region.................. S. leptocelloides

8. AR higher than 1.1; pedicels of proximal and distal Lauterborn organ of about the same length ( Figure 26D View Figure 26 ); Europe........... S. saltuum View in CoL

– AR lower than 1.0; pedicel of distal Lauterborn organ longer than pedicel of proximal Lauterborn organ ( Figure 10D View Figure 10 )............ 9

9. Antennal blade reaching apex of distal Lauterborn organ; antennal pedestal usually shorter than antennal segment 1 ( Figure 18D View Figure 18 ); Europe... S. flavidula View in CoL

– Antennal blade reaching well beyond apex of distal Lauterborn organ; antennal pedestal usually longer than antennal segment 1 ( Figure 10D View Figure 10 )..... 10

10. Spur on antennal pedestal well developed, digitiform, reaching one-half length of antennal segment 1; AR ca 0.8 ( Figure 6D View Figure 6 ); Europe....... S. brevis View in CoL

– Spur on antennal pedestal shorter, not reaching one-half length of antennal segment 1; AR ca 0.9 ( Figure 10D View Figure 10 ); Europe......... S. ciliaris