Genus Exortus Gnezdilov, 2004

Genus Exortus Gnezdilov, 2004
Type species (in original combination):

Hysteropterum punctiferum Walker, 1851 .

Synonyms:

None.

Distribution:

Southeastern United States.

Recognized species

There are two species currently assigned to this genus

Exortus fuscomaculosus (Doering, 1938) – USA: FL
= Hysteropterum fuscomaculosum Doering, 1938.
Exortus fuscomaculosus (Doering, 1938); comb. by Gnezdilov 2004: 2.

Exortus punctiferus (Walker, 1851)- USA: FL, GA, TX (reported in error: USA: NJ, CO)
Hysteropterum punctiferum Walker, 1851: 376.
Exortus punctiferus (Walker, 1851); comb. by Gnezdilov 2004: 2.

Economic Importance:

Limited.

Known host plants:

Apparently none.

Hosts from Wilson et al. 1994; plant names from USDA PLANTS or Tropicos.

Recognition:

Hind wings absent or rudimentary, Body elongate (not rounded in dorsal view, vs Paralixes & Traxus), wings not strongly reticulate; Intermediate carinae of front present, raised; smaller species usually 4.4 mm or less; vertex not as deeply emarginate as Tylanira; intermediate carinae of frons converging dorsally; frons at dorsal margin about as wide as tall at median carina (about 1.05x) with dorsal dorsal margin v-shaped; vertex about 2x wider than long in middle; forewings uniformly speckled with fine dots, otherwise not strongly patterned; dorsoanterior portion of head rounded (not raised) in lateral view; dorsal margin of forewing straight in lateral view; southeastern (not southwestern)

Doering’s (1938: 482) separation of the two species (extracted from the Hysteropterum key):

1. Vertex with lateral margins greatly elevated; its width only twice as great as length; hind tibiae with one lateral spine … fuscomaculosus (Doering)

1′. Vertex over twice as wide as long; lateral margins moderately elevated; hind tibiae with two lateral spines … punctiferus (Walker)

EXORTUS 1 EXORTUS 2

Exortus fuscomaculosus (all photographs by Kimberley Shropshire, University of Delaware)

Exortus fuscomaculosus (all photographs by Kimberley Shropshire, University of Delaware)

EXORTUS 4

Exortus punctiferus

Exortus punctiferus

This genus is not listed on Bugguide both species are included under Hysteropterum.

Collecting

Adults are taken by sweeping or beating (I collected a good series at Archbold biological station, near Lake Placid, Florida).

Molecular resources:

There is data for Exortus fuscomaculosus on Barcode of Life; there does not appear to be any data for this genus on Genbank.

Selected references:
Bartlett, C. R., L. B. O’Brien and S. W. Wilson. 2014. A review of the planthoppers (Hemiptera: Fulgoroidea) of the United States. Memoirs of the American Entomological Society 50: 1-287.

Doering. K. C. 1938. A contribution to the taxonomy of the subfamily Issinae in America north of Mexico (Fulgoroidea: Homoptera. Part II. University of Kansas Science Bulletin 25(20): 447-575.

Gnezdilov, V. M. 2004. Two new genera of the family Issidae (Homoptera: Cicadina: Fulgoroidea) from North America. Russian Entomological Journal 13(1–2): 1–2.

Gnezdilov, V. M. 2016. Notes on the phylogenetic relationships of planthoppers of the family Issidae (Hemiptera, Fulgoroidea) of the Western Palaearctic fauna, with descriptions of two new genera. Entomologicheskoe Obozrenie 95(2): 362-382.

Gnezdilov, V. M. and L. B. O’Brien. 2006. Generic changes in United States Issini (Hemiptera, Fulgoroidea, Issidae). Insecta Mundi 20(3-4): 217-225.

Metcalf, Z. P. 1958. General Catalogue of the Homoptera. Fascicle IV, Fulgoroidea, Part 15, Issidae. Waverly Press, Inc., Baltimore, Maryland.

O’Brien, L. B. 1988. Taxonomic changes in North American Issidae (Homoptera: Fulgoroidea). Annals of the Entomological Society of America 81(6): 865-869.

Spinola, M. 1839a. Essai sur les Fulgorelles, sous-tribu de la tribu des Cicadaires, ordre des Rhyngotes. Annales de la Société Entomologique de France 8: 133-337.

Spinola, M. 1839b. Essai sur les Fulgorelles, sous-tribu de la tribu des Cicadaires, ordre des Rhyngotes. (Suite). Annales de la Société Entomologique de France 8: 339-454.

Wang, M. L., Y. L. Zhang and T. Bourgoin. 2016. Planthopper family Issidae (Insecta: Hemiptera: Fulgoromorpha): Linking molecular phylogeny with classification. Molecular Phylogenetics and Evolution 105:224-234.

Wilson, S. W., C. Mitter, R. F. Denno and M. R. Wilson. 1994. Evolutionary patterns of host plant use by delphacid planthoppers and their relatives. In: R. F. Denno and T. J. Perfect, (eds.). Planthoppers: Their Ecology and Management. Chapman and Hall, New York. Pp. 7-45 & Appendix

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