Malaxa

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Taxonavigation

Ordo: Hemiptera
Familia: Delphacidae

Name

Malaxa Melichar, 1914 – Wikispecies link – Pensoft Profile

• Malaxa Melichar, 1914: 275; Muir 1926: 7; Metcalf 1943: 103; Fennah 1945: 429; Yang and Yang 1986: 56; Ding et al. 1999: 443; Chen et al. 2006: 160; Ding 2006: 150; Bartlett 2009: 387; Hou et al. 2013: 864; Bartlett and Kennedy 2018: 514.

Type species

Malaxaacutipennis Melichar, 1914.

Diagnosis

Description from Hou et al. (2013: 286–287) “Body slender and elongate, length (from apex of vertex to tip of tegmina): male 3.7–4.8 mm, female 4.3–5.1 mm, often with blackish brown markings. Head with eyes narrower than pronotum. Vertex longer or slightly shorter in middle than broad at base (0.95–1.24: 1), apex projected in front of eyes. Submedian carinae uniting before apex, greatest length of basal compartment shorter than wide at base of vertex (0.48–0.81: 1). Frons relatively long, longer in middle line than wide at widest part (~ 2.73–3.00: 1), widest at middle or apex. Rostrum reaching mesothoracic trochanters. Antennae cylindrical, very long, surpassing apex of clypeus, basal segment longer in middle than wide at apex (3.67–5.22: 1), shorter than frons in middle line (0.49–0.74: 1), shorter than the second segment (0.40–0.56: 1). Pronotum shorter than vertex in middle line (0.58–0.96: 1), lateral carinae attaining hind margin. Mesonotum longer in middle line than vertex and pronotum together (1.33–2.05: 1). Tegmina elongate, longer in middle line than wide at widest part (1.76–3.16: 1), much longer than abdomen, hyaline, cross vein deposited medially, apical margin acutely rounded. Spinal formula of hind tibia 5-6-4. Post-tibial spur large and thick, concave on inner surface, without teeth along the hind margin, with an apical tooth. Anal segment of male short, ring-like, left lateroapical angle produced into process. Pygofer with two broad lamellate medioventral processes, between of them with a V-like emargination. Genital styles broad in basal half, forked or with process at apex. Aedeagus with or without phallobase, phallus tubular, curved C-like and directed segmental venter.”

Key to species (males) of Malaxa from China (revised from Hou et al. 2013)

Key to species (males) of Malaxa from China (revised from Hou et al. 2013) — H. Li , L. Yang , X. Chen

1		Postclypeus yellow; tegmina with apical veins Cu1 and M3 diverging apically, posterior half of apical tegmina dark brown (see Chen et al. 2006: figs 2, 3)     M. semifusca
–		Postclypeus with basal half blackish brown; tegmina with apical veins Cu1 and M3 fused, first and second apical cells hyaline    2
2		Anal segment of male without process; aedeagus with phallobase    3
–		Anal segment of male with a long process; aedeagus without phallobase    4
3		Genae with basal half dark brown, apical half yellowish white; tegmina mostly hyaline; pygofer with 3 medioventral processes very distinct; genital styles with inner margin without process (see Hou et al. 2013: figs 2, 3, 8–11)     M. bispinata
–		Genae all dark brown; tegmina with basal half most yellow, apical half most dark brown; pygofer with medioventral processes not distinct; genital styles with inner margin with large process medially, hook-like (Figs 7–9, 11, 13)    M . hamuliferum sp. nov.
4		Genae dark brown; in posterior view, process of anal segment of male situated in middle of ventral margin (Chen et al. 2006: figs 21, 23, 25)     M. hunanensis
–		Genae mostly dark brown but apical with small part yellow; in posterior view, process of anal segment of male situated on left side of ventral margin    5
5		Genital styles with apex not forked; aedeagus with three processes (Figs 22–24)    M.tricuspis sp. nov.
–		Genital styles with apex forked; aedeagus with two processes    6
6		Area between lateral carinae of pronotum dark brown; two branches of outer apical angle of genital styles subequal; aedeagus with a small spine situated near basal third, directed caudally (see Chen et al. 2006: figs 30, 37, 38)     M. delicata
–		Area between lateral carinae of pronotum mostly yellow; two branches of outer apical angle of genital styles unequal; aedeagus with a small tooth situated near middle, directed right (see Chen et al. 2006: figs 11, 18, 19)     M. fusca

Taxon Treatment

• Li, H; Yang, L; Chen, X; 2019: Taxonomic study of the genus Malaxa Melichar, with descriptions of two new species from China (Hemiptera, Fulgoroidea, Delphacidae) ZooKeys, 861: 43-52. doi

Images

Figures 5–14. Malaxahamuliferum sp. nov. 5 head and thorax, dorsal view 6 same 7 face 8 tegmen 9 male genitalia, posterior view 10 same, lateral view 11 pygofer, ventral view 12 anal segment and aedeagus, lateral view 13 genital style, posterior view 14 same, left lateral view. Scale bars: 0.5 mm (5–8); 0.2 mm (9–14).  Figures 15–24. Malaxatricuspis sp. nov. 15 head and thorax, dorsal view 16 same 17 face 18 tegmen 19 male genitalia, posterior view 20 same, lateral view 21 pygofer, ventral view 22 anal segment and aedeagus, lateral view 23 aedeagus 24 genital style, left lateral view. Scale bars: 0.5 mm (15–18); 0.2 mm (19–22); 0.1 mm (23, 24).