Acanthococcus (Signoret, 1875)

Deeter, Lily A., Miller, Douglass R., Powell, Erin C. & Moore, Matthew R., 2025, A new species of grass-infesting felt scale (Hemiptera: Coccomorpha: Eriococcidae), with descriptions of all life stages and a key to the adult female Acanthococcus Signoret of Florida, U. S. A., Zootaxa 5717 (2), pp. 207-234 : 230

Key to adult female species of Acanthococcus of Florida, based on Miller & Miller (1993).

1(0) With 5 setae on each hind tibia (1 seta in middle of tibia)...................................................... 2

- With 4 setae on each hind tibia (without seta in middle of tibia)................................................. 8

2(1) Anal lobes each with 3 enlarged setae..................................................................... 3

- Anal lobes each with 4 setae...................................................... Ac. howelli Miller & Miller

3(2) Dorsal large-sized enlarged setae present in medial and/or mediolateral areas of abdomen............................ 5

- Dorsal large-sized enlarged setae absent from medial and/or mediolateral areas of abdomen.......................... 4

4(3) Tibia + tarsus less than 225 μm long.................................................. Ac. coccineus (Cockerell)

- Tibia + tarsus more than 275 μm long............................................ Ac. megaporus Miller & Miller

5(3) Hind tarsus equal to or slightly longer than hind tibia......................................................... 6

- Hind tarsus about half length of hind tibia............................................... Ac. quercus (Comstock)

6(5) Abdominal segment V with less than 26 enlarged setae....................................................... 7

- Abdominal segment V with more than 26 enlarged setae.................................... Ac. eriogoni (Ehrhorn)

7(6) Dorsal enlarged medial setae conical, with rounded or acute apices................... Ac. mesotrichus Miller & Miller

- Dorsal enlarged medial setae dome shaped with blunt apices....................... Ac. droserae Miller, Liu & Howell

8(1) Front tibiae each with 5 setae (with seta in middle).......................................................... 10

- Front tibiae each with 4 setae (without seta in middle)........................................................ 9

9(8) Microtubular ducts absent; multilocular pores absent from dorsum............ Ac. orzo Deeter, Miller & Powell , sp. nov.

- Microtubular ducts present; multilocular pores present on dorsum......................... Ac. dennoi Miller & Miller

10(8) Large-sized setae absent from medial and mediolateral areas of abdominal segments III to VII....................... 12

- Large-sized setae present in medial and mediolateral areas of abdominal segments III to VII......................... 11

11(10) Sensory seta on 5 th antennal segment short and thick with rounded apex not extending beyond base of sensory seta on 6 th antennal segment; longest enlarged setae 30–40 μm long, not overlapping in pre-gravid specimens; common on Lagerstroemia L. and other Lythraceae ......................................................... Ac. lagerstroemiae (Kuwana)

- Sensory seta on 5 th antennal segment long and slender with pointed apex extending beyond base of sensory seta on 6 th antennal segment; longest enlarged setae 45–55 μm long, overlapping in pre-gravid specimens; common on Rhododendron L. and other Ericaceae ......................................................................... Ac. azaleae (Comstock)

12(10) Large-sized marginal setae straight on abdominal segment VII................................................ 13

- Large-sized marginal setae conspicuously curved on abdominal segment VII.............. Ac. beshearae Miller & Miller

13(12) Multilocular pores near vulva predominantly with 5 loculi.................................................... 15

- Multilocular pores near vulva predominantly with more than 5 loculi........................................... 14

14(13) Dorsal multilocular pores present................................................. Ac. davidsoni Miller & Miller

- Dorsal multilocular pores absent......................................................... Ac. smithi (Lobdell)

15(13) With more than 1 large-sized enlarged seta on each margin of abdominal segment VII.............................. 17

- With 1 large-sized enlarged seta on each margin of abdominal segment VII...................................... 16

16(15) Large-sized enlarged setae present around entire body margin........................ Ac. monotrichus Miller & Miller

- Large-sized enlarged setae present on body margin on posterior abdomen and head only..................................................................................................... Ac. ophius Miller & Miller (in part)

17(15) Large-sized enlarged setae present around entire body margin............................. Ac. actius Miller & Miller

- Large-sized enlarged setae present on body margin on posterior abdomen and head only..................................................................................................... Ac. ophius Miller & Miller (in part)