Nesocerus, FREYTAG & KNIGHT, 1966

Krishnankutty, Sindhu M. & Dietrich, Christopher H., 2011, Taxonomic revision and phylogeny of an endemic leafhopper genus Nesocerus (Hemiptera: Cicadellidae: Idiocerinae) from Madagascar, Zoological Journal of the Linnean Society 162 (3), pp. 499-543: 500-503

publication ID 10.1111/j.1096-3642.2010.00690.x

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Type species Nesocerus spurus, Freytag & Knight   , by original designation.


Length of male, 3.25–6.6 mm; female, 4–7 mm.

Ochraceous with black markings on crown, pronotum, mesonotum, and face. Forewings with basal half fuscous, with markings along middle or costal margin. Leg yellowish or stramineous; usually with black markings along margins.

Head wider than pronotum. Length of scutum almost equal to combined length of crown and pronotum. Head, pronotum, and scutum shagreened. Antennae not expanded apically or subapically. Ocelli on face equidistant from imaginary midline and inner margin of compound eye. Frontoclypeus wider than length. Laterofrontal sutures extending to corresponding ocellus, more or less straight. Clypeogenal suture not reaching antennal ledge. Lorum not extending to apex of clypellus; usually separated from facial margin throughout length. Clypellus usually constricted at middle. Pronotum with hind margin straight. Forewings with three apical cells bordering broad appendix; with two subapical cells, first cell open, second cell open or closed; clavus with two veins. Hind femur setal formula 2 + 1 (in Nesocerus serratus   sp. nov. 2 + 0). Hind tibia flattened. Hind tarsomere I without dorsoapical setae, with two ventral longitudinal rows of short setae, pecten with lateral setae longer than platellae ( Fig. 2A, B View Figure 2 ).

Male pygofer with long or short posterodorsal process; posterolateral margin with setae; dorsolateral fold absent. Anal segment loosely attached to pygofer. Subgenital plate dorsoventrally flattened, longer than pygofer; in ventral aspect narrowed


1 Microsculpture of head: 0, shagreened; 1, striate

2 Microsculpture of pronotum: 0, shagreened; 1, striate

3 Presence of produced pronotum: 0, present; 1, absent

4 Markings on pronotum: 0, single spot; 1, pair of spots along imaginary transverse line; 2, mottled; 3, longitudinal bands; 4, absent

5 Lateral spot on vertex: 0, absent; 1, present

6 Laterofrontal suture: 0, present; 1, absent

7 Laterofrontal suture: 0, reaching ocelli; 1, not reaching ocelli

8 Clypeogenal suture extending to antennal ledge: 0, extending; 1, not extending

9 Setae on genal margin just ventrad of each eye: 0, absent; 1, present

10 Genae narrow: 0, narrow; 1, broad

11 Median width of lora: 0, same as midwidth of clypellus; 1, narrower; 2, broader

12 Lorum apex: 0, widely separated from genal margin; 1, not widely separated

13 Shape of lora: 0, hemispherical; 1, almost straight (apex not well defined)

14 Median marking on lora: 0, present; 1, absent

15 Position of maxillary sensory pit: 0, slightly above diagonal line from clypellus suture to lora; 1, in diagonal from clypellus suture; 2, below diagonal line from clypellus suture to lora; 3, at lowermost part of maxillary plate

16 Base of clypellus: 0, as broad as apex or preapex; 1, narrower than apex; 2, wider base

17 Posterior region of clypellus: 0, not depressed; 1, slightly depressed; 2, strongly depressed

18 Clypellar suture: 0, complete; 1, incomplete


19 Hind setae formula: 0, 2 + 0; 1, 2 + 1

20 Basal processes of tibial spine: 0, absent; 1, present

21 Number of dorsoapical setae on first hind tarsomere: 0, two; 1, absent

22 Presence of two longitudinal rows of ventral setae on first hind tarsomere: 0, present; 1, absent

23 Pecten of first hind tarsomere with lateral setae longer than median ones: 0, longer; 1, almost same length

24 Shape of hind tibia: 0, flattened; 1, rectangular in cross section


25 Number of apical cells bordering appendix: 0, two; 1, three

26 Subapical cell: 0, present; 1, absent

27 Presence of third subapical cell: 0, absent; 1, present

28 Forewing with third apical cell: 0, parallel; 1, diverging

29 Forewing with second apical cell: 0, diverging; 1, parallel; 2 converging

30 Presence of appendix: 0, present; 1, absent

Male genitalia

31 Anal collar: 0, present wide; 1, present, narrow

32 Ventra extension of anal collar: 0, present; 1, absent

33 Setae on pygofer: 0, absent or very short; 1, present

34 Pygofer process: 0, absent; 1, present

35 Shape of pygofer process: 0, posterodorsal, falcate, elongate; 1, posterodorsal falcate with ventral process; 2, tooth-like; 3, basiventral arising dorsally; 4, basiventral arising ventrally, apex curved; 5, posteroventral, extending dorsad

36 Orientation of tooth-like process: 0, posterad; 1, mesad; 2, dorsad

37 Apex of posterodorsal process: 0, elongate, attenuate; 1, elongate, blunt tip; 2, abruptly tapered and hooked; 3, distinctly bent ventromesad; 4, short and broad; 5, forked; 6, curved ventrad with dorsal process

38 Macrosetae subgenital plate: 0, absent; 1, present

39 Position of macrosetae: 0, submarginal; 1, mesal; 2, both submarginal and mesal; 3, median; 4, restricted to base; 5; restricted to apex

40 Submarginal macrosetae: 0, extending more than half of length of subgenital plate; 1, restricted to apical half

41 Submarginal row of macrosetae: 0, biseriate or multiseriate; 1, uniseriate

42 Mesal row extending: 0, extending beyond half; 1, restricted to half

43 Truncate apex of subgenital plate: 0, present; 1, absent

44 Apex of subgenital plate: 0, abruptly curved dorsad; 1, not curved

45 Fine setae: 0, present long; 1, short

46 Lobe that attaches to style: 0, well developed and produced; 1, poorly developed or absent

47 Subgenital plate: 0, dorsoventrally compressed; 1, dorsolaterally compressed

48 Mesal margin of subgenital plate expanded or pointed at the middle: 0, present; 1, absent

49 Style apodeme: 0, narrow 1, broad and ray-like markings

50 Style apex: 0, acute; 1, acuminate; 2, hooked; 3, foot-like; 4, broad, abruptly curved dorsad with processes; 5, broad with ventral process; 6, hooked ventrad; 7, expanded apically

51 Lateral lobe on inner margin of style: 0, absent 1, present

52 Presence of long setae on style: 0, present; 1, absent; 2, present on dorsal hump

53 Spines on style apex: 0, present; 1, absent

54 Presence of short setae on style: 0, present along dorsal or dorsolateral margin; 1, present along ventral surface; 2, absent

55 Texture of ventral margin of apophysis of style: 0, smooth; 1, serrated

56 Presence of spine on ventral margin of style posterad of joint with connective: 0, present; 1, absent 57 Connective 0, V-shaped; 1, U-shaped; 2, U-shaped with short median arm; 3, T-shaped with long arm; 4, T-shaped with short arm

58 Anterior margin of U-shaped connective: 0, deeply concave; 1, narrowly concave

59 Connection of aedeagus with connective: 0, articulate; 1, fused

60 Keel on connective: 0, absent; 1, two; 2, one

61 Presence of anterior projection on connective: 0, absent; 1, present

62 Presence of apical processes: 0, present; 1, absent; 2, reduced to spine

63 Number of apical processes: 0, paired symmetrical; 1, paired asymmetrical; 2, two pairs; 3, more than two pairs

64 Position of gonopore with respect to that of apical processes: 0, above processes or at extreme apex; 1, below processes

65 Aedeagus pustulate: 0, absent; 1, present towards apex, with prominent macrosetae along margin, fine setae long or short, restricted to dorsum of apex and along lateral margin. Style without lateral lobe, apophysis curved dorsally. Connective semicircular with two dorsal keels, T-, V-, or Y-shaped; articulated or fused to basal part of aedeagus. Aedeagus with socle developed or not; shaft cylindrical or laterally compressed, extending dorsad or anterodorsad, with or without apical or basal processes. Gonopore apical or subapical.

Female ovipostitor extending beyond pygofer. First valvulae blade-shaped, curved slightly dorsally with strigate dorsal sculptured area.

Distribution: Widely distributed in Madagascar.

Discussion: The genus can be distinguished by the following combination of characters: forewing with three apical cells bordering appendix; hind tarsomere I without pair of dorsoapical setae, plantar surface of hind tarsomere I with two ventral longitudinal rows of short setae, platellae shorter than lateral setae; subgenital plate depressed with macrosetae on ventral surface.