''Pachypsylla'' is a genus of North American

psyllids Psyllidae, the jumping plant lice or psyllids, are a Family (biology), family of small plant-feeding insects that tend to be very host-specific, i.e. each plant-louse species only feeds on one plant species (monophagous) or feeds on a few closel ...

. Species of the genus ''Pachypsylla'' lay eggs on the leaves of the '' Celtis occidentalis'' tree. Upon hatching, the young psyllids become encased in a

gall Galls (from the Latin , 'oak-apple') or ''cecidia'' (from the Greek , anything gushing out) are a kind of swelling growth on the external tissues of plants. Plant galls are abnormal outgrowths of plant tissues, similar to benign tumors or war ...

which the young leaf parts grow in response to the infestation.

Species

The following species are recognised in the genus ''Pachypsylla'': *''

Pachypsylla celtidisasterisca ''Pachypsylla'' is a genus of North American psyllids. Species of the genus ''Pachypsylla'' lay eggs on the leaves of the '' Celtis occidentalis'' tree. Upon hatching, the young psyllids become encased in a gall which the young leaf parts grow in ...

'' Riley, 1890 *''

Pachypsylla celtidiscucurbita ''Pachypsylla'' is a genus of North American psyllids. Species of the genus ''Pachypsylla'' lay eggs on the leaves of the '' Celtis occidentalis'' tree. Upon hatching, the young psyllids become encased in a gall which the young leaf parts grow in ...

'' Riley, 1890 *''

Pachypsylla celtidisgemma ''Pachypsylla'' is a genus of North American psyllids. Species of the genus ''Pachypsylla'' lay eggs on the leaves of the '' Celtis occidentalis'' tree. Upon hatching, the young psyllids become encased in a gall which the young leaf parts grow in ...

'' Riley, 1885 – hackberry bud gall maker *''

Pachypsylla celtidisglobula ''Pachypsylla'' is a genus of North American psyllids. Species of the genus ''Pachypsylla'' lay eggs on the leaves of the '' Celtis occidentalis'' tree. Upon hatching, the young psyllids become encased in a gall which the young leaf parts grow in ...

'' Riley, 1890 *''

Pachypsylla celtidisinteneris ''Pachypsylla'' is a genus of North American psyllids. Species of the genus ''Pachypsylla'' lay eggs on the leaves of the '' Celtis occidentalis'' tree. Upon hatching, the young psyllids become encased in a gall which the young leaf parts grow in ...

'' Mally, 1894 *'' Pachypsylla celtidismamma'' (Riley, 1881) – hackberry nipplegall maker *''

Pachypsylla celtidispubescens ''Pachypsylla'' is a genus of North American psyllids. Species of the genus ''Pachypsylla'' lay eggs on the leaves of the '' Celtis occidentalis'' tree. Upon hatching, the young psyllids become encased in a gall Galls (from the Latin , 'oak-a ...

'' Riley, 1890 *'' Pachypsylla celtidisumbilicus'' Riley, 1890 *'' Pachypsylla celtidisvesicula'' Riley, 1890 – hackberry blistergall psyllid *'' Pachypsylla cohabitans'' Yang & Riemann, 2001 *'' Pachypsylla dubia'' Patch, 1912 *'' Pachypsylla pallida'' Patch, 1912 *''

Pachypsylla tropicala ''Pachypsylla'' is a genus of North American psyllids. Species of the genus ''Pachypsylla'' lay eggs on the leaves of the '' Celtis occidentalis'' tree. Upon hatching, the young psyllids become encased in a gall which the young leaf parts grow in ...

'' Caldwell, 1944 *''

Pachypsylla venusta ''Pachypsylla'' is a genus of North American psyllids. Species of the genus ''Pachypsylla'' lay eggs on the leaves of the '' Celtis occidentalis'' tree. Upon hatching, the young psyllids become encased in a gall which the young leaf parts grow in ...

'' (Osten-Sacken, 1861) – petiolegall psyllid

Gallery

References

Aphalaridae Psylloidea genera {{Sternorrhyncha-stub