Pagastia Oliver, 1959

Makarchenko, Eugenyi A. & Hansen, Dean C., 2020, Pagastia (P.) donoliveri sp. nov. - a new Nearctic alpine stream chironomid species (Diptera: Chironomidae: Diamesinae) from the Beartooth Mountains, Wyoming U. S. A., Zootaxa 4755 (1), pp. 171-176 : 175

publication ID

https://doi.org/10.11646/zootaxa.4755.1.9

publication LSID

lsid:zoobank.org:pub:B3EC6807-4B94-4FC6-9B5C-FEC08A24B882

DOI

https://doi.org/10.5281/zenodo.3728596

persistent identifier

https://treatment.plazi.org/id/187E87E0-FFC2-FF9D-FF50-A87DFA2D7E51

treatment provided by

Plazi

scientific name

Pagastia Oliver
status

 

Key to the known species of Pagastia Oliver of Holarctic region

Males

1. Eyes hairy. Aedeagal lobes reduced (subgenus Hesperodiamesa Sublette ). Basal lobe of gonocoxite small.................................................................... P. (H.) sequax (Garrett, 1925) ( Makarchenko 2019, Fig. 18)

– Eyes bare or pubescent. One or two aedeagal lobes present (subgenus Pagastia Oliver ). Basal lobe of gonocoxite large.... 2

2. Both median and lateral aedeagal lobes present. AR 2.5-4.2................................................... 3

– Only lateral aedeagal lobe present. AR 1.0–2.42............................................................ 6

3. Antepronotum with dorsal and lateral setae in widely separated groups. Median aedeagal lobe digitated and widest distally. 4

– Antepronotum completely covered with setae. Median aedeagal lobe widest medially, then tapering abruptly and with the apex forming a sharp hook.......................... P. (Pagastia) partica (Roback, 1957) ( Makarchenko 2019, Figs.16–17)

4. Gonostylus subapically with “heel”................ P. (P.) nivis (Tokunaga, 1936) ( Makarchenko 2006, Fig. 180, 5–10)

– Gonostylus subapically without “heel”.................................................................... 5

5. Apex of the gonostylus angled................. P. (P.) orientalis (Tshernovskij, 1949) ( Makarchenko 2006, Fig. 181, 1–5)

– Apex of the gonostylus broadly rounded................................................................................................ P. (P.) altaica Makarchenko, Kerkis et Ivanchenko, 1997 ( Makarchenko et al. 1997, Fig. 1 View FIGURES 1–3 )

6. Anal point absent. Alula as well as M 1+2, M 3+4, and Cu 1 of wing with setae................................................................................ .. P. (P.) subletteorum Makarchenko ( Makarchenko 2019, Figs. 1–6 View FIGURES 1–3 View FIGURES 4–5 View FIGURES 6–9 , 19–20)

– Anal point present. Alula and M 1+2, M 3+4, Cu 1 without setae.................................................... 7

7. Anal point almost parallel-sided in dorsal view; lateral aedeagal lobe tapering to thin apex........................... 8

– Anal point tapering to apex; lateral aedeagal lobe broad in distal part........................................... 10

8. Anal point with rounded apex and without apical peg.. P. (P.) orthogonia Oliver, 1959 ( Makarchenko 2019, Figs. 7 View FIGURES 6–9 –13, 21)

– Anal point with pointed apical peg........................................................................ 9

9. Gonostylus with small basal lobe in outer side; apically rounded, without “heel”. AR 1.56–1.75............................................................................. P. (P.) hidakamontana Endo, 2004 ( Endo 2004, Figs. 1–6 View FIGURES 1–3 View FIGURES 4–5 View FIGURES 6–9 )

– Gonostylus with rounded basal lobe in outer side and with lobe like “heel” apically. AR 1.22–1.26........................................................................................ P. (P.) donoliveri sp. nov. ( Figs. 4 View FIGURES 4–5 , 6, 7, 9 View FIGURES 6–9 )

10. Anal point narrow, tapering to pointed apex, without apical peg; gonostylus in basal part with outer angle-shaped projection. AR 2.18–2.42................. P. (P.) tianmumontana Makarchenko et Wang, 2017 ( Makarchenko &Wang 2017, Fig. 17)

– Anal point widest in basal part and thin apically, pointed and sometimes with apical peg; gonostylus without outer basal projection and with rounded apex. AR 1.81–2.10........ P. (P.) lanceolata (Tokunaga, 1936) ( Makarchenko 2006, Fig. 180, 1–4)

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Chironomidae