Xenococcinae, TANG, 1992

Hodgson, Chris, 2012, Comparison of the morphology of the adult males of the rhizoecine, phenacoccine and pseudococcine mealybugs (Hemiptera: Sternorrhyncha: Coccoidea), with the recognition of the family Rhizoecidae Williams 3291, Zootaxa 3291 (1), pp. 1-79 : 52

Key to genera in Xenococcinae based on adult male morphology:

1. Antennae 1 segmented; legs reduced, each with a pointed claw and two spine-like digitules; lobes on abdominal segment VIII small, each with a few short setae + 3 longer setae; head, thorax and 1 st -abdominal segments all showing some strong sclerotisation....................................................... Xenococcus (based only on X. acropygae ) ( Fig. 22 )

- Antennae 2 or 5 segmented; legs generally well developed but occasionally reduced, but claw digitules (when present) setose; lobes on abdominal segment VIII either absent or well developed, without the above combination of setae; without any strong sclerotisation on head, thorax or 1st abdominal segment...................................................... 2

2. Abdominal segment VIII with well-developed lateral lobes on either side of penial sheath, each lobe with many setae of moderate-length; abdominal constriction present posterior to segment II; claw digitules present, setose. Neochavesia ( Figs 19–21 )

- Abdominal segment VIII without lateral lobes; setae on abdominal segment VIII either very few and extremely minute or with at least a few setae longer than penial sheath; abdominal constriction present posterior to segment III; claw digitules absent............................................................................... Eumyrmococcus ( Figs 16–18 )

Figures

FIGURE 16. Eumyrmococcus sarawakensis Williams. Adult male. Where J = 2 dorsal views of posterior end of abdomen, L = 2 ventral views of posterior end of abdomen, and V = minute setae. For other labels, see under Materials and methods: conventions. (Modified after Williams, 1998)

FIGURE 17. Eumyrmococcus smithii Silvestri. Adult male. Where L = ventral view of penial sheath, and N = side view of posterior end of abdomen. For other labels, see under Materials and methods: conventions. (Modified after Kishimoto-Yamada et al., 2005)

FIGURE 18. Eumyrmococcus taylori Williams. Adult male. Where J = dorsal view of posterior end of abdomen; L = ventral view of penial sheath, and V = minute capitate setae. For other labels, see under Materials and methods: conventions. (Modified after Williams, 1998).

FIGURE 19. Neochavesia caldasiae (Balachowsky). Adult male. Where A = hair-like setae; C = loculate pores, J = dorsal view of poster end of abdomen, and L = ventral view of abdomen. For other labels, see under Materials and methods: conventions. (Modified after Williams, 2004a).

FIGURE 20. Neochavesia lapollai Williams. Adult male. Where A = hair-like setae; J = dorsal view of posterior end of abdomen; L = ventral view of abdomen and M = claw. For other labels, see under Materials and methods: conventions. (Modified after Williams, 2004a).

FIGURE 21. Neochavsia nr. trinidadensis (Beardsley). Adult male. Where H = apex of antenna; K = distal end of posterior leg, and N = oblique ventral view of penial sheath. For other labels, see under Materials and methods: conventions.

FIGURE 22. Xenococcus acropygae Williams. Adult male. Where A = minute setae; K = side and lateral view of claw; L = ventral view of penial sheath, N = side view of posterior end of abdomen; M = lobes of abdominal segment VIII, and Q = antenna. For other labels, see under Materials and methods: conventions. (Modified after Williams, 1998).