Aphis impatientis Thomas, 1878

Lagos-Kutz, Doris, Halbert, Susan E., Voegtlin, David J. & Hartman, Glen L., 2018, Revision of the taxonomic status of Aphis floridanae Tissot (Hemiptera: Aphididae) using morphological and molecular insight, Insecta Mundi 2018 (627), pp. 1-10 : 5-6

Aphis impatientis Thomas, 1878

Aphis floridanae Tissot, 1933 , new synonymy

Diagnosis. Despite of the overlapping of the ratios: Pt/B, SIPH/CA and URS/HT2, they seem to be useful for discrimination and there are other descriptive characters that can be used for diagnosis. The apterous viviparae of Aphis impatientis can be distinguished from A. nasturtii by the color of siphunculi that are dark throughout and curved outwards. The antennal segments III of A. impatientis and A. nasturii have secondaria sensoria arranged in a row and scattered respectively. Also, both morphs of A. impatientis lack marginal tubercles on abdominal segments II–V while A. nasturtii has marginal tubercles on all abdominal segments. Lastly, the body color of both morphs of A. impatientis and A. nasturtii is brownish and greenish respectively. For more comparative morphometric data and photographs of these species, A. salicariae and A. rumicis see Lagos-Kutz et al. (2016) and Lagos-Kutz et al. (2018).

Description. Apterous viviparae (n = 37) ( Table 2 and Fig. 1–6 ). Color in life ( Fig. 14–15 ). Head, siphunculi and cauda black. Abdomen brown with white wax. Antennal segments one and six dusky, the other segments light-orange. Legs light-orange and dusky. Thorax and abdomen brown dusted with white wax. Color on slide and morphological characters. Head: dusky with 2 frontal setae. Antennal tubercles undeveloped. Antennae six- segmented, shorter than body. Antennal segments: one and six dusky; the other segments pale. Secondary sensoria absent on all antennal segments. Rostrum extending to mesocoxae. Thorax: Coxae dusky. Trochanters paler than coxae. Fore femora dusky. Middle and hind femora dark, pale near the base. Tibiae pale, darkening near distal tip. Tarsi dusky. Abdomen: Cauda dark, parallel sided and blunt. Siphunculi dark, curved outwards with flange. Marginal sclerites pale. Pre-siphuncular and post-siphuncular sclerites absent. Marginal tubercles present on abdominal segments I and VII, absent from II, III, and IV. Dorsum of abdomen without sclerites. Subgenital plate dusky, complete. Dorsal cuticle with reticulation.

Alate viviparae (n = 42) ( Table 2 and Fig. 7–11 ). Color in life ( Fig. 15 ). Head and thorax black. Abdomen brown, shiny, without wax. Wings dusky, transparent. Femora black, and tibiae light-yellow. Color on slide and morphological characters. Head: Dark with 2 frontal setae. Antennal tubercles undeveloped. Antennae six-segmented, shorter than body. All antennal segments dark. Antennal segments III and IV with secondary sensoria arranged in a single row. Rostrum does not reach the metacoxae. Thorax: Coxae dark. Trochanters paler than coxae. Fore femora dusky. Middle and hind femora dark except at the base. Tibiae pale, darkening near distal tip. Tarsi dark. Abdomen: Cauda dark, finger shaped. Siphunculi dark, weakly curved outwards with flange. Marginal sclerites dark. Pre-siphuncular sclerite absent. Post-siphuncular sclerite dark. Marginal tubercles present on abdominal segments I and VII. Dorsal abdomen with transverse sclerites on VII, and VIII. Subgenital plate dusky, complete.

Apterous oviparae (n = 8) ( Table 2). Color in life. Same color pattern as apterous vivipara. Color on slide and morphological characters ( Fig. 12 ). Head: Dusky without frontal setae. Antennal tubercles undeveloped. Antennae five-segmented, shorter than body. Antennal segments dusky. Rostrum reaches mesocoxae. Thorax: Coxae dusky. Trochanters pale. Fore femora pale throughout, mid and fore femora dusky except at base. Tibia pale throughout. Tarsi dusky. Hind tibia not swollen and without pseudosensoria. Abdomen: Siphunculi dusky, strongly curved outwards with reduced flange. Cauda dusky, oblong and pointed. Pre-siphuncular and post-siphuncular sclerites absent. Marginal tubercles present only on abdominal segments I and VII. Marginal tubercles on abdominal segments II, III, and IV absent. Dorsum of abdomen without sclerites. Subgenital plate dark, and divided.

Alate male (n = 3) ( Table 2). Color in life. Same color pattern as alate vivipara. Color on slide and morphological characters ( Fig. 13 ). Head: Dark without frontal setae. Antennal tubercles undeveloped. Antennae six-segmented, shorter than body. Antennae with secondary sensoria scattered on segments III, IV, and V. Antennal segments dusky. Rostrum reaches mesocoxae. Thorax: Coxae dusky. Trochanters pale. Fore femora pale throughout, mid and fore femora dusky except at base. Tibia pale, darkening near distal tip. Tarsi dusky. Abdomen: Siphunculi short and slightly curved outwards. Cauda dusky, oblong and pointed. Marginal tubercles present on abdominal segments I and VII. Male genitalia dark with 2 short claspers anteriorly and aedeagus centrally.

Figures

Figures 1–13. Aphis impatientis. 1–6) Apterous vivipara. 1) Body. 2) Ultimate rostral segment. 3) Siphunculus. 4) Cauda. 5) Marginal tubercle on abdominal segment VII. 6) Marginal tubercle on abdominal segment I. 7-11) Alate vivipara. 7) Body. 8) Antennal segments: III–IV. 9) Ultimate rostral segment. 10) Siphunculus. 11) Cauda. 12) Apterous ovipara, body. 13) Alate male, body.

Figures 14–15. Colony of Aphis impatientis. 14) On Erechtites hieraciifolius. Photograph: Lyle Buss, senior biological scientist. University of Florida, Institute of Food and Agricultural Sciences, Florida. 15) On Impatiens capensis. Photograph: David Voegtlin, emeritus INHS of University of Illinois at Urbana-Champaign, Illinois.