Xenolecanium, Takahashi, 1942

Hodgson, Chris J., 2022, Three new species of the genus Xenolecanium Takahasi (Hemiptera: Coccomorpha: Coccidae), with an updated generic diagnosis and key to species, Zootaxa 5222 (5), pp. 457-466 : 465

Key to species of Xenolecanium and Takahashilecanium adult females

1(0) Legs and antennae fairly-well developed, showing clear segmentation. Ventral tubular ducts absent from either side of vulva. Multilocular disc-pores present either side of vulva. Claws with dissimilar denticles, one broader than other.................................................................................... Takahashilecanium rotundum Kondo

- Legs and antennae very much reduced, segmentation obscure. Ventral tubular ducts generally present on either side of vulva. Multilocular disc-pores absent from either side of vulva. Claws with similar denticles, both narrow..... Xenolecanium … 2

2(1) Marginal setae stoutly setose, without fimbriations and not broadening towards apex............................... 3

- Marginal setae either with fimbriations or broadening towards apex, or both...................................... 4

3(2) Cribriform plate dorsad to mouthparts composed of loosely arranged sclerotised pores. Each stigmatic cleft with spiracular disc-pores along margin. Large oval to round sclerotised areas on dorsum mostly each more than 200 μm wide and relatively sparse. Preopercular pores sparse.............................................. X. pendleburyi Hodgson sp. nov.

- Cribriform plate composed of a compact group of sclerotised pores, each pore more or less touching. Each stigmatic cleft without spiracular disc-pores along margin. Large oval to circular sclerotised areas on dorsum mostly each about 40 μm (none over 100 μm) wide, abundant. Preopercular pores abundant.......................... X. maritimum Hodgson sp. nov.

4(3) Marginal setae narrow, many with frayed apices......................................... X. mangifera e Takahashi

- Marginal setae often obviously broadening towards apex, becoming blade-like; occasionally a few also fimbriate......... 5

5(4) Preopercular pores present, forming broad submedial bands of closed pores extending from anal plates to anterior to cribriform plate, each pore slightly larger than small simple pore. Some marginal setae with frayed apices..................................................................................................... X. ryoichii Hodgson sp. nov.

- Preopercular pores absent, dorsum with only small simple pores and microducts. Marginal setae without frayed apices........................................................................................ X. takahashii Kondo