Three new species of Orthocladius subgenus Eudactylocladius (Diptera: Chironomidae) from Norway
Ole
Saether, A.
Zootaxa
2004
508
1
12
[740,949,1062,1088]
Insecta
Chironomidae
Eudactylocladius
CoL
Animalia
Diptera
10
11
Arthropoda
genus
1. Superior volsella well developed, rounded to rightangled ........................................................ 2 Superior volsella scarcely to moderately developed................................................................... 3 2 Inferior volsella well developed, bluntly triangular; dorsal part of cibarial pump wider than long; no sensilla chaetica on mid leg; Palaearctic .................................... O. ( E.) musester sp. n. Inferior volsella weakly indicated to nonexistent; dorsal part of cibarial pump not as wide as long; sensilla chaeticae present on mid leg; Palaearctic ............................................................... .......................................................................................................... O. ( E.) fuscimanus(Kieffer) 3. Inner margin of gonocoxite with strong dense setae, commencing some distance posterior of gonocoxite base, associated with weakly delimited superior volsella ........................................ 4 Inner margin of gonocoxite with finer, less dense, setae, commencing closer to gonocoxite base, anterior to sometimes moderately indicated superior volsella........................................... 5 4. Gonostylus without inner projection, squama with 9–14 setae; Nearctic..................................... ....................................................................................................... O. ( E.) subletteorumCranston Gonostylus with inner, preapical, triangular projection; squama with 13–20 setae; Palaearctic. ................................................................................................................ O. ( E.) priomixtus sp. n. 5. Superior volsella moderately developed, angular; anal point strong, but not strongly sclerotised, greater than 50 mlong; ultimate flagellomere at least 500 mlong; Holarctic ............... ................................................................................................................... O. ( E.) gelidusKieffer Superior volsella scarcely developed; anal point weak to moderately developed or strong and sclerotised, usually less than 50 mlong; ultimate flagellomere often less than 500 mlong. 6 6. Anal point strong, well sclerotised; sensilla chaeticae of legs absent; Svalbard.......................... ..................................................................................................................... O. ( E.) schnelli sp. n. Anal point sometimes very weak to absent, never strongly sclerotised; sensilla chaeticae probably always present on mid and hind legs .................................................................................... 7 7. Gonostylus with microtrichiae on dorsal surface strong and dense, anal point sometimes very weak to absent; Nearctic .................................................................. O. ( E.) dubitatusJohannsen Gonostylus with microtrichiae on dorsal surface fine and sparse, anal point well developed .. 8 8. Gonocoxite with both volsellae distinct, particularly the superior; Holarctic .............................. ........................................................................................................... O. ( E.) gelidorum(Kieffer) Gonocoxite without differentiated volsellae, just a gently rounded contour; Holarctic ............... ............................................................................................................... O. ( E.) olivaceusKieffer