Umbonichiton, Henderson & Hodgson, Hodgson & Henderson, 2000

Henderson, Rosa C. & Hodgson, Chris J., 2005, Two new species of Umbonichiton (Hemiptera: Sternorrhyncha: Cocccoidea: Coccidae) from New Zealand, Zootaxa 854 (1), pp. 1-11 : 4

Key to adult female Umbonichiton

1. Each posterior stigmatic cleft with a large spinose seta similar to those in anterior clefts ....................................................................................................................................... 2

– Each posterior stigmatic cleft lacking a large spinose seta, but with an enlarged marginal spinose seta on both anterior and posterior margins ........... U. bispinatus sp. nov.

2. Dorsal macropores approximately mushroom­shaped when seen from the side, apex expanding to several times the width of the basal "stalk" .............................................. ............................................................................. U. pellaspis Henderson and Hodgson

– Top of dorsal macropores approximately similar in width to or narrower than their inner base ..................................................................................................................... 3

3. Dorsal macropores 'bollard­like' or truncated cone­like, with a broadened or blunt apex ....................................................................................................................................... 4

– Dorsal macropores 'cone­like', with more or less pointed apices ................................. 5

4. Marginal reticulation point setae larger than other marginal setae; with approx. 10 setae laterally between stigmatic clefts ........................... U. bullatus Henderson & Hodgson

– Marginal reticulation point setae not larger than other marginal setae; with 2 or 3 setae laterally between stigmatic clefts ....................................................... U. rimu sp. nov.

5. Ventral tubular ducts present medially on head, thorax and abdomen ......................... 6

– Ventral tubular ducts absent medially on head, thorax and abdomen (although 1–3 ducts occasionally present between coxae) ...................... U. hymenantherae (Maskell)

6. Marginal setae finely spinose, with 3–5 between stigmatic clefts; dorsal macropores few, with none in transverse median reticulation line anterior to anal plates; ventral tubular ducts sometimes present medially on abdominal segments II and III, or absent medially on all abdominal segments ......................... U. adelus Henderson & Hodgson

– Marginal setae clearly spinose, with 5–10 between stigmatic clefts; dorsal macropores more numerous, with several on transverse median reticulation line anterior to anal plates; ventral tubular ducts scattered throughout abdominal segments II–V ................ ................................................................................... U. jubatus Henderson & Hodgson