Orthocladiinae, Namayandeh & Hudson & Ghaderi & Vasquez & Ram, 2023

Namayandeh, Armin, Hudson, Patrick L., Ghaderi, Edris, Vasquez, Adrian A. & Ram, Jeffrey L., 2023, Alaskacladius gen. nov., (Diptera: Chironomidae), a unique new orthoclad from Alaska, Zootaxa 5325 (4), pp. 571-581 : 578-579

A key to the adult male of some genera of Orthocladiinae

1. Antenna with a stiff and straight apical seta. Eyes naked. Acrostichals present or absent. If present long, starting in front of antepronotum. Squama of the wing setose; Cu 1 curved. Pulvilli is present and well-developed......................... 2

- Not with the above combination of characters.................................................... Not keyed here

2. Acrostichals present or absent. Preepisternum sometimes with seta(e). Pseudospurs present or sometimes absent. Gonostylus with outer corner...................................................................................... 3

- Acrostichals present. Preepisternum without seta. Pseudospurs absent. Gonostylus without outer corner................. 5

3. Acrostichals present. Inferior volsella mainly prominent, triangular, or trapezoid shape; if reduced, never digitiform....... 4

- Acrostichals absent. Inferior volsella small and digitiform................................. Parachaetocladius Wülker

4. Virga absent. Pseudospurs present. Inferior volsella, mainly triangular or occasionally reduced..... Georthocladius Strenzke

- Virga present. Pseudospurs absent. Inferior volsella trapezoid shape ( Figs. 1D & 3A )............. Alaskacladius gen. nov.

5. Anal point well-developed and long; bearing strong lamellate setae......................... Doithrix Saether & Sublette

- Anal point triangular or occasionally absent, never long; bearing moderately strong setae but never lamellate....................................................................................... Pseudorthocladius Goetghebuer

Figures

FIGURE 1. Alaskacladius johnhudsoni gen. nov., sp. nov., male. A. head; B. thorax; C. wing; D. hypopygium.

FIGURE 3. Alaskacladius johnhudsoni gen. nov., sp. nov., male. A. hypopygium, arrow indicates the virga; B. variation in the shape of turned gonostylus C. variation in the shape of turned gonostylus. The scale bars represent 50 µm.