Chironomidae

Cranston, Peter S., 2007, The Chironomidae Larvae Associated With The Tsunami-Impacted Waterbodies Of The Coastal Plain Of Southwestern Thailand, Raffles Bulletin of Zoology 55 (2), pp. 231-244 : 232

Key to subfamilies of larval Chironomidae found

1. Antenna retractile into head ( Fig. 3 , ant). Hypopharynx with distinctive toothed ligula ( Figs. 4, 5 , lig). Mentum, the medioventral plate, usually weakly sclerotised ( Fig. 15 , arrow, m) ........................................................................ Tanypodinae

– Antenna non-retractile ( Figs. 22 , 38 ). Mentum, the most prominent mouthpart forms a strongly sclerotised plate ( Figs. 20, 21 , m). Hypopharynx without ligula ........................... 2

2. Mentum associated with variably developed, but always broad and usually striated ventromental plates ( Figs. 20, 21 , vmp) ........................................................................... Chironominae

– Mentum with small, non-striate ventromental plates ( Fig. 17 , vmp) ................................................................. Orthocladiinae

Figures

Figs. 1–12. Thai post-tsunami Chironomidae. Clinotanypus sp.: 1, lateral body setal fringe; 2, dorsomentum; 3, ventral head (anterior). Tanypus sp.: 4, ligula. Fittkauimyia sp.: 5, ligula, pecten hypopharyngis; 6, mandible; 7, mentum. Ablabesmyia sp.: 8. maxillary palp. Monopelopia sp.: 9, maxillary palp. Ventral head setae and pit of: 10, Paramerina sp., 11, Ablabesmyia sp. Monopelopia sp.: 12, posterior parapod claw. Abbreviations: ant, antenna; dmt, dorsomentum teeth; fr, fringe; lig, ligula; m, mentum; md, mandible; mp, maxillary palp; ph, pecten hypopharyngis; RO, ring organ of maxilla; SSm, seta submenta; S9, S10, cephalic setae 9, 10; VP, ventral pit.

Figs. 13–25. Thai post-tsunami Chironomidae. Ventral head setae and pit: 13, Monopelopia sp., 14, Larsia sp. Larsia sp.: 15, mentum; 16, pupal thoracic horn. Parakiefferiella sp.: 17, mentum; 18, antenna; 19, mandible. Menta: 20, Tanytarsus formosanus; 21, Zavreliella sp. Antennae: 22, Tanytarsus formosanus; 23, Tanytarsus ‘Thai 1’; 24, Tanytarsus ‘Thai 2’; 25, Zavreliella sp. Abbreviations: LO, Lauterborn organ; m, mentum; sm, submentum; SSm,seta submenta; S9, S10, cephalic setae 9, 10; vmp, ventromental plate; VP, ventral pit.

Figs. 37–47. Thai post-tsunami Chironomidae. Dicrotendipes spp.: dorsal heads: 37, D. pelechloris; 38, D. septemmaculatus; 39, D. sarinae. Mentum and ventromental plate: 40, D. pelechloris; 41, D. septemmaculatus; 42; D. sarinae. Kiefferulus spp., dorsal head sclerites: 43, K. longilobus; 44, K. calligaster; 45, K. barbatitarsis. Mentum, ventromental plate, anterior cardo: 46, K. calligaster, 47, K. barbatitarsis. Abbreviations: cly, clypeus; fen, fenestra; sc1–4, labral sclerites 1–4; vmp, ventromental plate.