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a |
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1A
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Antennal
flagellum with long, flexible sensilla, and a few placoid sensilla;
mandible as in fig a, ex F. abutilifolia ...Nigeriella
fusciceps Wiebes
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a |
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1B
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Antennal
flagellum with placoid sensilla (attached for whole length to antennal segment)
(fig. a) ...2
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a |
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2A
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Mandible
with nineteen ventral ridges, the appendage with ca. 26 lamellae that
distally become distinctly denticulate (fig a), ex F.
pseudomangifera ...Nigeriella
letouzeyi
Wiebes
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2B
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Mandible
with four to eight ventral ridges, the appendage with two rows of 10 -
20 teeth (figs a, b & c) ...3
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3A
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Scape
with produced, but bluntly convex ventral edge with small tooth at the
base (fig. a) ; mandibular
appendage narrow, 6X longer than wide (figs. b); postmarginal vein 1.7X
longer than the stigmal vein; pronotum with deep, V-shaped posterior
invagination extending to anterior edge (fig. c), F. populifolia
...Nigeriella
scindura van Noort
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a |
b |
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3B
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Scape
with prominent, sharp ventral projection; mandibular appendage broader,
2.5-3.3X longer than wide (figs a & b); postmarginal vein at most
1.5X length of stigmal vein; pronotum either entire or with weak
posterior invagination not extending to anterior edge ...4
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a |
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4A
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Mandibular
appendage 2.5X longer than wide, with eleven teeth on each edge (fig a);
postmarginal vein subequal in length to the stigmal vein; pronotum with
medial V-shaped posterior invagination extending to anterior margin as
suture, ex F. rubra ...Nigeriella
avicola
Wiebes
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a |
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4B
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Mandibular
appendage 3.3X longer than wide, with seventeen teeth on each edge (fig a); postmarginal vein much longer (1.5X) than the stigmal vein; pronotum
entire, shallowly concave on posterior margin, ex F.
tettensis ...Nigeriella
excavata
Compton
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1A
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Head
with dorsal prominences next to the antennal toruli, ex F.
abutilifolia ...Nigeriella
fusciceps Wiebes
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1B
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Head smooth
and flat adjacent to antennal toruli ...2 |
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2A
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Antennae short, hardly
projecting over clypeal margin, not elbowed, scape reduced and not
visible; head dorso-ventrally flattened, wedge-shaped in lateral view;
fore femur large, robust, ex F.
populifolia
...Nigeriella
scindura van Noort
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2B
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Antennae elonagte, projecting well over clypeal margin, elbowed,
scape large and visible;
head not flattened,
box-shaped in lateral view; fore femur not enlarged
...3 |
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3A
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Strong
suture connecting the eyes across the posterior of the head. Antenna
with one funicular segment, ex F.
tettensis ...Nigeriella excavata
Compton
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3B
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Posterior of head smooth. Antenna with 2 or 3 funicular segments ...4
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