Pachypsylla celtidisglobula

Name	Type	Notes
Pachypsylla celtidis-globulus	scientific

This species was declared a synonym of Pachypsylla celtidismamma by Tuthill and others and has been treated as such by users on Bugguide and iNaturalist. However, it is listed as valid in Thomas 2012, apparently the most recent listing of species in the genera, and its gall is readily distinguished from Pachypsylla celtidismamma sensu strictu.

Pachypsylla celtidisglobula galls are narrow near the leaf but expand to a blunt, wide tip that resembles the bottom of a particularly squat apple in the way it pulls in to a central scar. This scar is the most reliable way to distinguish it from Pachypsylla celtidismamma sensu strictu. However, when the latter is hairless and its glaucous coat is rubbed off, it tends to be shiny, while celtidisglobula galls are never glacous and generally matte. The galls are green-apple green in the summer, fading to tan-brown by the fall or sometimes blush red-purple on the outer face. Two galls occasionally grow together, forcing each to bend at an angle.

It is not clear how to distinguish them from P celtidiscucurbita.

Pachypsylla celtidis-globulus n. sp.

A gall on the upper side of the leaf represented by a very circular hole with vertical walls near the top and widening internally; the rim is not thickened, but is vertically elevated above the leaf surface around the opening. The walls and bottom of the excavation are without decided sculpture and of a lighter color than the leaf; the elevated rim is of the same color as and not thicker than the leaf. Average diameter 1.75 mm. On the under side of the leaf the gall is globular or slightly more pyriform and almost stylate, or slightly more flattened and more sessile. There is a larger or smaller shallow apical depression without central nipple, but sometimes limited by a raised rim. Surface a little shining, finely rugose and not pubescent, rarely furnished with a solitary hair. Average diameter 3.3 mm. I have only a single leaf covered with these galls received from Columbia, S. C, collected in the month of September. No imago has been reared therefrom. This is at once distinguished from the preceding species by the very deep vertical impression on the upper side of the leaf and its globular smooth form on the under side of the leaf.

Pachypsylla celtidisglobula

Synonymy (1)

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Further Information (5)