Aphis

Lagos, Doris M., Puttler, Benjamin, Voegtlin, David J. & Giordano, Rosanna, 2012, A new species of Aphis (Hemiptera: Aphididae) in Missouri on St. John’s Wort, Hypericum kalmianum, and re-description of Aphis hyperici Monell, Zootaxa 3478, pp. 81-92 : 91

Key to Aphis apterous viviparae feeding on Hypericum

Characters useful to discriminate these species are included in the following morphological key for apterous viviparae, as well as in an online interactive key ( Lagos & Voegtlin 2008). Couplets for species ( A. hypericiphaga , A. hypericiradicis , A. pavlovski and A. chloris ) were adapted from Blackman & Eastop (2006).

1. Ultimate rostral segment without accessory setae. Antennae five segmented. Abdomen with dorsal sclerites. Waxy black aphid on H. kalmianum ( Figure 1 , Figure 8 A)........................................................... mizzou sp.n.

-. Ultimate rostral segment with two or more accessory setae. Antennae six segmented. Abdomen without dorsal sclerites.... 2

2. Siphunculi 0.3–0.7× length of cauda…..................................................................... 3

-. Siphunculi 0.8–2.5× length of cauda…..................................................................... 4

3. Cauda with 6–7 setae. Hind coxa, trochanter, cauda and subgenital plate dusky. Siphunculi dark. Body reddish, dorsum cov- ered with wax. ( Figure 5 , Figure 8 B)................................................................ hyperici

-. Cauda with 12 or more setae. Hind trochanter, cauda, siphunculi, and subgenital plate pale. Body pale yellowish and greenish. Oval wax patches laterally on abdominal and thoracic segments. ( Figure 8 C).......................... hypericiphaga

4. Dome-like marginal tubercles on all abdominal segments….................................................... 5

-. Dome-like marginal tubercles restricted to abdominal tergites 1 and 7 ….......................................... 6

5. Antenna VI Pt/Base 2.2–2.8. Marginal tubercles on abdominal tergites 1–4 and 7........................ hypericiradicis

-. Antenna VI Pt/Base 1.5–1.7. Marginal tubercles on all abdominal tergites.............................. …. pavlovski

6. Cauda dark, with 4–7 setae. Antenna VI Pt/Base 1.6–2.1…............................................... chloris

-. Cauda pale, with 5–7 setae. Antenna VI Pt/Base 2.4–3.1…............................................... gossypii

Figures

FIGURE 1. Apterous vivipara of A. mizzou (INHS: 511,101 collection number). (A) body, (B) eight tergite abdominal, (C) first marginal tubercle and hind coxa, (D) sub-genital plate, (E) cauda, (F) ultimate rostral segment, (G) siphunculus, (H) seventh marginal tubercle.

FIGURE 5. Apterous vivipara of A. hyperici (A) body, (B) second and third antennal segments, (C) ultimate rostral segment, (D) first abdominal segment without tubercle (E) cauda, (F) siphunculus and seventh marginal tubercle, (G) hind tibia and tarsus.

FIGURE 8. Colonies of aphids on Hypericum spp. A. A. mizzou n. sp. on H. kalmianum, B. A. hyperici on H. kalmianum (photos by C. J. Starbuck), C. A. hypericiphaga on H. perforatum (photo by H. Kim).