Fitchiella robertsonii

(Fitch, 1856)

ball-nosed planthopper

Fitchiella robertsonii is a rare, diminutive planthopper historically known from fewer than 20 collection sites across North America. The was considered potentially extinct until its rediscovery in Iowa tallgrass prairie in 2008, with subsequent 12-year research yielding 219 specimens—representing 90% of all known collections. measure less than 5 mm but can leap 35 inches in a single jump, roughly 250 times their body length. The species exhibits both brachypterous (short-winged, flightless) and (long-winged) forms.

Pronunciation

How to pronounce Fitchiella robertsonii: //fɪˈkiː.lə roʊˌbɜːrˈtsə.ni.aɪ//

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Identification

The most distinctive feature is the inflated, spherical, shiny knob at the tip of the beak (rostrum), which gives the its "ball-nosed" . This structure can be filled with fluid and may function in intraspecific communication. are extremely small, measuring less than 5 mm in length—approximately the thickness of two stacked pennies. Both brachypterous (short-winged, flightless) and (long-winged, potentially dispersing) forms have been documented, with macropterous adults only recently discovered.

Habitat

Native tallgrass prairie remnants, particularly xeric (dry) hill prairies with shallow, rocky limestone-derived soils and steep slopes (grades up to 60%). Also found in loess hill prairies with wind-deposited, fertile soils. Requires presence of grasses, especially Indian grass (Sorghastrum nutans). Occupies reconstructed grasslands with frequent spring burning and heavy grazing history. Absent from virgin tallgrass and sand prairies in surveyed regions.

Distribution

Recorded from 16 U.S. states and Ontario, Canada. Confirmed extant in Iowa, with highest concentration in northeastern (Allamakee County) and western Iowa prairie remnants. Historical records from Arkansas, Florida, Illinois, Indiana, and other states; current status in most localities unknown and potentially extirpated. No guarantee of persistence in majority of historically recorded states.

Diet

Phloem-feeding on graminaceous plants. Primary host: Indian grass (Sorghastrum nutans). Secondary host: big bluestem (Andropogon gerardii). Survival documented on secondary host, though primary host association appears strongly preferred based on collection success.

Host Associations

Sorghastrum nutans - primary Indian grass; association confirmed through 12-year field study. Sweeping this dramatically increased collection success.
Andropogon gerardii - secondary big bluestem; can survive on this grass, though appears less preferred.

Life Cycle

Nymphs and collected together indicate overlapping . Longevity and data first described in 2021 study. by Dryinidae (Hymenoptera) documented. Specific developmental stages and voltinism remain incompletely characterized.

Behavior

Extraordinary leaping ability: single documented jump of 35 inches (89 cm) by a male, approximately 250 times body length. Beak inflation with fluid observed, hypothesized to function in communication between individuals. Primarily ground-dwelling or grass-stem associated; collected by sweeping vegetation. More or less flightless in brachypterous form; form may permit limited .

Ecological Role

herbivore in native tallgrass prairie . Documented of Dryinidae . Potential for prairie conservation due to strict requirements and host specificity.

Human Relevance

Subject of intensive conservation concern due to extreme rarity and loss. Less than 0.1% of Iowa's original tallgrass prairie remains, threatening persistence. Research value: rediscovery and ecological study represents significant advance in understanding of rare insect biodiversity. No documented agricultural pest status or economic impact.

Similar Taxa

Other Caliscelidae members share general planthopper , but F. robertsonii is distinguished by unique inflated spherical beak knob and extreme rarity in prairie .
Brachypterous FulgoromorphaShort-winged planthoppers in other may appear superficially similar, but the ball-nosed beak structure and specific grass associations are diagnostic.

More Details

Conservation status

Considered rare or endangered in some states; no federal listing. Future in Iowa described as "tenuous at best." Threatened by prairie fragmentation, eastern red cedar (Juniperus virginiana) encroachment, and ongoing loss. Fire appears compatible with persistence, potentially beneficial for maintaining open grassland habitat.

Research significance

The 2008-2020 Iowa study by Rice and Hatfield increased world specimen collection by an order of magnitude, transforming understanding of this historically elusive . First documentation of overturned previous assumption of complete flightlessness.

Collection difficulty

Four collecting trips in 2009-2011 yielded only two specimens. Discovery of Indian grass association in 2012 dramatically improved detection rates, demonstrating critical importance of host plant knowledge for rare insect survey.