Lygistorrhinidae

Hippa, Heikki, Mattsson, Ingegerd & Vilkamaa, Pekka, 2005, New taxa of the Lygistorrhinidae (Diptera: Sciaroidea) and their implications for a phylogenetic analysis of the family, Zootaxa 960, pp. 1-34 : 11

Key to genera of Lygistorrhinidae

We include Lygistorrhina asiatica in the key separately because a new genus is needed for it. According to the phylogenetic analysis ( Fig. 1 ) it is the sister group of all other living Lygistorrhinidae . Lygistorrhina (Lygistorrhina) and Lygistorrhina (Probolaeus) are separated even if their monophyly is not yet shown. The sexual dimorphism in the species of the Lygistorrhinidae is largely unknown and it is possible that some of the characters used below apply only to males.

1. Number of ocelli 3......................................................................................................... 2

­ Number of ocelli 2......................................................................................................... 6

2. Rs present, sclerotized............................................................. Palaeognoriste Meunier

­ Rs absent or discernible only as a non­sclerotized fold ............................................... 3

3. Proboscis short, at most two and a half times the height of head ................................ 4

­ Proboscis long, four or more times as long as the height of head ................................ 5

4. Subcosta ending in costa, R1 meeting costa at the middle of wing ............................... ...........................................................................” Lygistorrhina ” asiatica Senior­White

­ Sc ending free, R1 meeting costa well within the basal half of wing ............................ ..................................................................................................... Labellorrhina gen. n.

5. Middle tibia with two apical spurs ............. Lygistorrhina Skuse , subg. Lygistorrhina

­ Middle tibia with one apical spur.... Lygistorrhina Skuse , subg. Probolaeus Williston

6. Hind basitarsomere swollen, as broad as apical part of hind tibia ............................... 7

­ Hind basitarsomere thin, narrower than apical part of hind tibia ( Figs 5 B, 6B, 7B) .... 9 7. C with a swelling at the apex of vein R1, proboscis very short, about one­tenth the height of head ...................................................................................... Seguyola Matile ­ C without a swelling at the apex of R1, proboscis long, as long as or longer than the height of head ............................................................................................................... 8 8. Number of antennal flagellomeres 12, R1 meeting the costal margin well in basal half of wing .................................................................... Loyugesa Grimaldi & Blagoderov ­ Number of antennal flagellomeres14, R1 meeting the costal margin at the middle of wing Matileola Papp

Figures

FIGURE 1. Phylogeny of Lygistorrhinidae. The strict consensus cladogram of 14 most parsimonious cladograms (78 steps, CI 61, RI 82) obtained with the program NONA. Black dot = unique (reversals allowed), open circle = homoplastic synapomorphy. Large numbers above branches refer to Bremer support values.

FIGURE 5. Labellorrhina quantula sp. n. (paratypes): male thorax (A), lateral view, hind femur, tibia and basitarsomere (B), retrolateral view, apical part of hind tibia (C), retrolateral view and apical part of middle tarsus (D), lateral view. Scale for A 0.10 mm, for B 1 mm, for C and D 0.05 mm.