Simulium ceylonicum
Creators: name: Jitklang, Sanae
name: Kuvangkadilok, Chaliow
name: Baimai, Visut
name: Takaoka, Hiroyuki
name: Adler, Peter H.
Publisher: name: Zenodo
Year: 2008
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Simuliidae
Simulium
Simulium ceylonicum

description: Key to larvae of 10 cytoforms in the S. ceylonicum group in Thailand *
(Figs. 9–10)
1 Postgenal cleft (Fig. 9 E–G)> 5.0 x as long as postgenal bridge, reaching or approaching hypostoma.....2
- Postgenal cleft (Fig. 9 A–D, H–J) <5.0 x as long as postgenal bridge, leaving moderate length of postge- nal bridge.....................................................................................................................................................4
2 Abdomen without reddish-brown markings dorsally; abdominal setae unbranched (Fig. 10 A)................... ................................................................................................................................................. nr. asakoae 4
- Abdomen with reddish-brown markings dorsally; abdominal setae branched (Fig. 10 B)..........................3
3 Abdomen yellowish ............................................................................................................. trangense n. sp.
- Abdomen yellowish except segments I–IV greenish ......................................................................... sheilae
4 Abdomen yellowish except segments I and IV greenish.............................................................................5
- Abdomen yellowish except segments I–III or I–IV greenish......................................................................6
5 Postgenal cleft (Fig. 9 J) subequal to or shorter than postgenal bridge. ................................... inthanonense
- Postgenal cleft about twice as long as postgenal bridge (Fig. 9 D).......................................... nr. asakoae 3
6 Abdomen yellowish except segments I–III greenish...................................................................................7
- Abdomen yellowish except segments I–IV greenish...................................................................................8
7 Abdominal segment V with reddish-brown transverse band dorsally ................................... curtatum n. sp.
- Abdominal segment V without distinct colored band ............................................................. nr. asakoae 2
8 Head spots faint ......................................................................................................................... nr. sheilae 3
- Head spots distinct.......................................................................................................................................9
9 Hypostoma shorter than its greatest width ....................................................................................... asakoae
- Hypostoma nearly as long as its greatest width ............................................................... doisaketense n. sp.
description: Published as part of Jitklang, Sanae, Kuvangkadilok, Chaliow, Baimai, Visut, Takaoka, Hiroyuki & Adler, Peter H., 2008, Cytogenetics and morphotaxonomy of the Simulium (Gomphostilbia) ceylonicum species group (Diptera: Simuliidae) in Thailand, pp. 1-28 in Zootaxa 1917 on page 23, DOI: 10.5281/zenodo.184626