Hecaloidella Osborn 1934
Creators: name: Xu, Deliang
name: Webb, Michael D.
name: Shang, Suqin
name: Zhang, Yalin
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Cicadellidae
Hecaloidella

description: Key to species and species groups of Hecaloidella (excluding H. brunifasciata)
1 Vertex with distinct longitudinal or oblique striations at least to anterior transverse sulcus; pronotum with distinct transverse striations; forewing with outer subapical cell tapered basally (Figs. 2B, 3D); aedeagus disassociated from connective (H. nitida species group)....................................................................................... 2
- Vertex and pronotum smooth or with indistinct striations; forewing with outer subapical cell tapered posteriorly (Fig. 1I); aedeagus associated or disassociated from connective.......................................................... 6
2 Vertex without brown anterior spots................................................................. H. nitida
- Vertex with pair of brown anterior spots................................................................... 3
3 Vertex spots large (Fig. 1A); rest of vertex uniformly yellow (Fig. 2A)................................. H. bimaculata
- Vertex spots small (Fig. 1B) to moderately large (Fig. 1E); rest of vertex orange anteriorly........................... 4
4 Vertex spots extending to fore margin; forewing dark with inner margin of clavus variably yellowish (Figs. 1E–F); aedeagus with a basal ventral spine-like process (Fig. 4L)..................................................... H. pacifica
- Vertex spots not extending to fore margin; forewing not as above; aedeagus with basal ventral process not spine-like...... 5
5 Connective caudal extension with a long basal ventral process (Fig. 4C)............................... H. caudospina
- Connective caudal extension without a basal ventral process (Fig. 4H)................................. H. nudapenis
6 Pronotum, mesoscutum and scutellum laterally with one small brown spot (Figs. 1N–S); aedeagus disassociated from connective (H. quadripicta species group)...................................................................... 12
- Pronotum and mesonotum not marked as above; aedeagus associated with connective (H. borneoensis species group)..... 7
7 Vertex with a brownish spot each side of midline nearly coalescing basally (Fig. 1M); connective stem not extended caudally, with a pair of apical spines (Fig. 6Q); aedeagus with a long ventral process from preatrium (Fig. 6S)............ H. spinosa
- Vertex uniformly brown or with a brick shaped brownish band each side of midline and a smaller brown mark next to each eye (Figs 1H–L); connective stem extended caudally, aedeagus without a ventral process from preatrium................... 8
8 Aedeagus with either a single very small subapical process dorsally or two pair of apical processes.................... 9
- Aedeagus without processes............................................................................ 10
9 Aedeagus with a single small subapical process (Fig. 6F)............................................ H. brevispina
- Aedeagus with two pair of apical processes (Fig. 6M)............................................. H. quadrispina
10 Aedeagal shaft less than twice as long as height of atrium (Fig. 6D)................................... H. brevipenis
- Aedeagal shaft more than twice as long as height of atrium (Figs 6B, I)......................................... 11
11 Aedeagus with gonopore arising near mid-length of shaft (Fig. 6I).................................... H. longipenis
- Aedeagus with gonopore arising two thirds distance to apex of shaft (Fig. 6B).......................... H. borneoensis
12 Connective with posterior extension (Fig. 7N)............................................................. 13
- Connective without posterior extension (Fig. 7D)...................................................... H. brevis
13 Aedeagus with processes.............................................................................. 14
- Aedeagus without processes (Fig. 7M, P)........................................................... H. knighti
14 Aedeagus with a single pair of apical processes............................................................ 15
- Aedeagus with two pairs of apical processes (Fig. 8F)........................................... H. sandakanensis
15 Aedeagus with apical processes bifurcate (Fig. 8J); dorsal processes near mid-length of shaft in lateral view (Fig.8I)............................................................................................... H. singaporensis
- Aedeagus with apical processes not bifurcate, sometime with a small subapical spine (Fig. 7H); dorsal process sub-basally on shaft in lateral view (Fig. 7H)........................................................................... 16
16 Style with poorly developed lateral lobe (Fig. 7J); female pregenital sternite truncate with median conical projection (Fig. 7L)...................................................................................... H. brunnifacialis
- Style with well-developed lateral lobe (Fig. 8C); female pregenital sternite with posterior margin broadly rounded (Fig. 8D)......................................................................................... H. quadripicta
description: Published as part of Xu, Deliang, Webb, Michael D., Shang, Suqin & Zhang, Yalin, 2021, Review of the Pacific leafhopper genus Hecaloidella (Hemiptera: Cicadellidae Deltocephalinae: Selenocephalini) with description of sixteen new species, pp. 381-403 in Zootaxa 4948 (3) on pages 385-386, DOI: 10.11646/zootaxa.4948.3.4, http://zenodo.org/record/4629100