[Return to North American Issidae]
- 1 Family Issidae Spinola, 1839: 339.
- 2 Subfamily Thioniinae Melichar, 1906
- 3 Tribe Thioniini Melichar, 1906
Family Issidae Spinola, 1839: 339.
Subfamily Thioniinae Melichar, 1906
Tribe Thioniini Melichar, 1906
Subtribe Thioniina Melichar, 1906
[Note: The family-level status of ‘Thionini’ has changed several times, but most recently it has been upgraded to subfamily by Wang et al. 2016]
Genus Cheiloceps Uhler, 1895
Type species (in original combination): Cheiloceps musca Uhler 1895: 68.
Comment: Cheiloceps was described as a genus by Uhler, 1895, subsumed by Fennah, 1955 as a subgenus of Thionia; then restored to genus by Gnezdilov, 2018.
There are 9 species in this genus as follows:
Cheiloceps anguillana (Fennah 1965 :104) – Anguilla
= Thionia anguillana Fennah 1965 :104
= Cheiloceps anguillana (Fennah 1965); comb. by Gnezdilov, 2018:163.
Cheiloceps argo (Fennah 1949: 60) – Puerto Rico, St. Thomas, St. Croix, Vieques, Jost Van Dyke, Culebreta Is
= Thionia argo Fennah 1949: 60.
= Cheiloceps argo (Fennah 1949); comb. by Gnezdilov, 2018:163.
Cheiloceps borinquensis (Dozier 1931: 18) – Puerto Rico
= Thionia borinquensis Dozier 1931: 18
= Cheiloceps borinquensis (Dozier 1931: 18); comb. by Gnezdilov, 2018:163.
Cheiloceps borinqueta (Caldwell 1951: 251, in Caldwell & Martorell 1951) – Puerto Rico
= Thionia borinqueta Caldwell 1951: 251 (in Caldwell & Martorell 1951)
= Cheiloceps borinqueta (Caldwell 1951: 251, in Caldwell & Martorell 1951); comb. by Gnezdilov, 2018:163.
Cheiloceps musca Uhler 1895: 68 – St. Vincent
= Cheiloceps musca Uhler 1895: 68, original combination
= Thionia (Cheiloceps) musca (Uhler 1895: 68); comb. by Fennah 1945 :122.
= Cheiloceps musca Uhler 1895: 68; comb. restored by Gnezdilov, 2018: 162.
Cheiloceps musca grenadana (Fennah 1955: 34) – Dominica
= Thionia (Cheiloceps) musca grenadana Fennah 1955: 34, original combination
= Cheiloceps musca grenadana (Fennah 1955: 34); comb. by implication Gnezdilov, 2018: 162.
Cheiloceps puertoricensis (Caldwell 1951: 251, in Caldwell & Martorell 1951) – Puerto Rico
= Thionia puertoricensis Caldwell 1951: 251 (in Caldwell & Martorell 1951).
= Cheiloceps puertoricensis (Caldwell 1951: 251, in Caldwell & Martorell 1951); comb. by Gnezdilov, 2018: 163.
Known host plants:
As noted by Gnezdilov 2018 [comments in square brackets] (Figure references are for Gnezdilov, 2018).
“Fennah (1955: 34) mentioned in his diagnosis of Cheiloceps, this group of species is distinguished from typical Thionia by [a] peculiar “…elongate strongly tapering distad, decurved, and acute at apex” ovipositor (Fig. 7).
“Examined structure and venation of hind wing of Thionia cinctifrons (Stål) (Fig. 2) [type species of Thionia] are very close to those of Cheiloceps musca Uhler (Fennah 1955, fig. 4d) (Figs 4, 9). However all species of the genus Cheiloceps are well distinguished by uniform nearly square coryphe and elongate metope with distinct median carina and weak sublateral carinae (Fennah 1965, figs 29, 30). In my [V. M. Gnezdilov] opinion these features of head and ovipositor mentioned above are good enough to treat Cheiloceps Uhler, 1895 as a separate genus of the family Issidae (Gnezdilov 2013).
Currently this genus comprises 8 species from Puerto Rico and Lesser Antilles including the new combinations proposed below.
Description from Gnezdilov, 2018
“Diagnosis. Metope elongate, with distinct (sometimes not for the whole length) median carina and sublateral carinae (sometimes weak) (Fennah 1965, fig. 29) (Fig. 6). Median and sublateral carinae joined below upper margin of metope. Coryphe nearly square, often with incomplete median carina (Fennah 1965, fig. 30) (Fig. 4). Second and third segments of rostrum are almost equal in length; third segment narrowing apically (Fig. 17). Fore
wings elongate, surpassing abdomen, without hypocostal plate. Forewing vein sequence: R 2–3, with first furcation near to basal cell; M 2, furcating before wing middle; CuA 1. Clavus long, open—Pcu+A1 runs into apex of clavus (Fennah 1965, fig. 32). Hind wings well developed, 3-lobed, with distinct coupling lobe on its anterior margin (Figs 9, 10). Hindwing vein sequence: R 2, furcating after wing middle; M 1; CuA 2, furacting apically; CuP 1; Pcu 2, furcating apically and partly fused with A1.1 at mid length; A1 2; A2 2–3, firstly furcating at mid length (Figs 4, 5). Hind tibia with 2 lateral spines in distal half. First metatarsomere with a whole row of spines arranged in arc. Phallobase poorly sclerotized dorso-apically. Aedeagus with often poorly sclerotized ventral hooks, curved and directed ventrocephalad (Fennah 1965, fig. 33). Gonoplacs elongate and tapering distad (Figs 4, 7). Female anal tube long and narrow.”
[still to come]
Adults are taken beating woody vegetation or by inspection of hosts, sometimes in passive traps (windowpane traps).
There are no data for this genus on Genbank; Barcode of Life has data for three Thionia (Thionia ellipticus, T. gibbicollis,and T. simplex).
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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.
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