Culex thalassius (L)
Culex thalassius (Theobald, 1903)
Type-loc: Gambia
Culex thalassius is similar to that of Cx. sitiens, but differs in having a longer siphon and about 65 comb scales against 35. Its easily separated from Culex laticinctus by the fact that all the subventral tufts of the siphon are placed distal to the pecten.
Culex thalassius (L)
Culex thalassius (L)
Culex thalassius (F)
- Developmental stage : 2. larva
- ABDOMEN: Arrangement of the siphon setae 1-S : non décrit
- HEAD: Number of branches of the seta 6-C : 4. 4 or more branches
- THORAX: Number of branches of the prothoracic seta 3-P : 1. 1 branch
Head
- HEAD: colour of maxillary palpus : 1. entirely dark
- HEAD: colour of proboscis : 5. with a clearly marked median pale ring
- HEAD: Number of teeth of the mentum : 1. less than 8 on each side of the median tooth
- HEAD: Insertion of the antennal seta 3- A : 2. far from the seta 4-A
- HEAD: Shape of the pre-clypeal seta 1-C : 2. stout all along
- HEAD: Number of branches of the seta 4-C : 1. 1 branch
- HEAD: Number of branches of the seta 5-C : 4. 4 or more branches
- HEAD: Number of branches of the seta 14-C : 1. 1 branch
Thorax
- THORAX: Prespiracular and postspiracular setae : 1. prespiracular and postspiracular setae absent
- THORAX: scutum's ornamentation : 1. without well-marked patterns
- THORAX: prealar areas ornamentation : 1. without prealar scales
- THORAX: lower mesepimeral seta : 1. without setae
- THORAX: postspiracular area's ornamentation : 1. without scales
- THORAX: Number of branches of the prothoracic seta 8-P : 2. 2 branches
- THORAX: Number of branches of the prothoracic seta 4-P : 2. 2 branches
Wings
- WING: colour of the scales on the wing veins : 2. pale scales only along the costal margin
- WING: position of wing veins R2+3 and M1+2 : 2. furcation of vein R2+3 more distant from the furcation of vein M1+2
- WING: Uranotaenia or not : 2. apex of anal vein ends after mcu/cuA fork ; 4. length of the R2+R3 vein is shorter than R2/R3
- WINGS and LEGS I - III: Culex or Coquillettidia : 2. wing scales narrow, pulvili present, claws smaller - Culex genus
Legs
- LEG I: tibia's colour : 1. entirely dark or with some pale scales at the apex
- LEG I: Orthopodomyia or not : 2. tarsomere 4 is equal or longer than tarsomere 5 ; 4. length of tarsomere 1 is shorter than tarsomere 2 through 5
- LEG III: colour of tibia : 2. with an apical pale ring
- LEG I: colour of the scales on the coxa : 2. with pale and dark scales
- LEG II: tibia's colour : 1. dark with at most some pale scales
- LEG II: colour of the external side of the femur : 1. entirely dark
- LEG III: relative sizes of tarsomere 1 and tibia : 1. tarsomere nearly as long as tibia ; 3. tarsomer clearly longer than tibia
- LEG III: colour of femur : 1. with the basal half partially dark
Abdomen
- ABDOMEN: colour of tergite III : 2. with a basal pale band
- ABDOMEN: Ornametation of tergite III : 2. with a basal pale band
- ABDOMEN: Respiratory aperture - Siphon : 2. opening at the apex of a cylindrical tube - siphon
- ABDOMEN: Siphonal tufts : 1. several pairs of siphonal tufts - Culex
- ABDOMEN: Abdominal plates : 1. abdominal plates absent
- ABDOMEN: Number of branches of the saddle seta 1-X : 1. 1 branch
- ABDOMEN: Shape of the siphon sub-apical spine 2-S : 1. short
- ABDOMEN: Shape of the distal tooth of the siphon pecten : 3. more than 5 basal denticles
- ABDOMEN: Length of seta 1a-S and the siphon's diameter : 2. seta is longer than the diameter
- ABDOMEN: Insertion of the seta 1-S _ Culex : 3. beyond the last pecten tooth
- ABDOMEN: Number of branches on seta 1a-S on the siphon : 3. 6 or more branches
- ABDOMEN: Siphon index (total length/diameter at base) : 3. from 4.6 to 5.9
- ABDOMEN: general shape of the siphon : 1. with staight sides
- ABDOMEN: shape of the comb scales : 1. all without a median spine
- ABDOMEN: arrangement of the comb scales : 2. untidy
- ABDOMEN: Number of branches of the seta 6-VI : 2. 2 branches
- ABDOMEN: Number of branches of the seta 7-I : 1. 1 branch