Citroriginis elongata, Sanborn, 2021

Sanborn, Allen F., 2021, A new species, genus and tribe of cicada (Hemiptera: Cicadoidea: Cicadidae Tibicininae) from Chile with a list of Chilean cicada fauna, Zootaxa 4952 (1), pp. 87-100 : 93-95

Citroriginis elongata n. gen., sp. Exuvia

( Fig. 2 )

Material examined. “ ANGOL-CHILE / 2 Dic 1948 / Bello” female exuvia ( MSUC) .

Remarks. The male paratype is on the same pin as the female exuvia described here. The presence of the dorsal and ventral gonaophyses clearly distinguish the exuvia as female.

Description. Body length 18 mm, ochraceous with tawny posterior segment margin, narrow with curved posterior abdomen covered with long, sparse setae, denser on ventral surface and legs.

Head. Head slightly wider than long, about as wide as anterior pronotum. Antennae five segmented, scape very small, distal segment extending to apex of anterior postclypeus. Postclypeus inflated, bulbous, rostrum reaching to middle of middle coxae. Postclypeus and anteclypeus covered with dense, long setae, sparse setae on remaining head, long setae radiating from ventral and lateral eye.

Thorax. Dorsal pronotum about 3.4 mm, dorsal mesonotum about 3.8 mm, and dorsal metanotum about 1.1 mm in length on midline. Fore wing and hind wing apices reaching to middle of abdominal tergite 2. Setae sparse on tergites, greatest density on dorsoposterior and lateral pronotum and dorsoposterior mesonotum and metanotum, ventrally restricted to posterolateral sternites.

Legs. Legs covered with long, radiating, dense setae. Fore femora with long posterior tooth, rounded distally, angled slightly distally, slightly twice as long as wide at base, with lobate accessory tooth extending from distal base. Diastema separating posterior tooth of femur from single intermediate tooth of femur. Fore femoral comb with four teeth, apical tooth broadened, blade-like. Fore tibia blade well-developed, notched near base, small apical point, single, stout, well-developed, pointed apical tooth, area between apical point of tibia blade and apical tooth curved giving appearance of additional point. Fore tarsus two-segmented, apical tarsomere very elongated, pretarsal claws of unequal length with lateral claw curved and more than twice the length of medial spine. Middle tibia with three apical spines, medial spine longest, narrow, posterior spine stout almost as long as medial spine, lateral spine shortest only about one-third lateral spine length. Middle tarsus two-segmented, apical tarsomere elongated, pretarsal claws of unequal length with medial claw more than twice lateral claw length. Hind tibiae with two apical spines, medial spine narrower but slightly longer. Hind tarsus two-segmented, apical tarsomere elongated, pretarsal claws of unequal length with medial claw about twice the length of lateral claw.

Abdomen. Abdomen cylindrical, longer than head and thorax length combined, only slightly constricted at base. Segments one and two producing a distinct waist, width expanding at segment three maintaining width to segment six where begins to reduce width towards apex. Sternites bright ochraceous, epipleurites with curved medial margin. Tergites, sternites and epipleurites radiating long setae, denser on sternites.

Genitalia. Sternite IX roughly triangular, longer than broad, about twice as long as triangular sternite X, ventral gonapophyses (medial pair) wider than dorsal gonapophyses (lateral pair), sternite XI hidden by posterior of sternite X.

Remarks. The shapes of the fore femoral and tibial extensions are significantly different from South American exuviae described previously along with the unique genitalia morphology presented here ( Motta 2003; Maccagnan & Martinelli 2011). The lobate accessory tooth is similar to those described in Magicicada septendecim ( Linnaeus, 1758) , the fossils Burmacicada protera Poinar and Kritsky, 2011 and Dominicada youngi Poinar and Kritsky, 2011 ( Poinar and Kritsky 2011), and the South African Afromelampsalta mimica ( Distant, 1907) ( Sanborn & Villet 2020) .

Figures

FIGURE 2. Exuvia of a female Citroriginis elongata n. gen., n. sp.: A, lateral view; B, dorsal view; C, fore femur, tibia and tarsi; D, middle leg tibia and tarsi; E, hind tibia and tarsi; F, ventral view of genitalia. Abbreviations: acf—accessory tooth of femur, apt—apical tooth of tibia, bt—blade of tibia, f—femur, fc—femoral comb; itf—intermediate tooth of femur, ptf—posterior tooth of femur, t—trochanter, ti—tibia. Scale bar: A–B, 5 mm; C–D, 1 mm; E, 2 mm.