Aulacaspis Cockerell

Niu, Minmin, Cai, Bo & Wei, Jiufeng, 2023, A new species of Aulacaspis and a revived combination of Diaspididae (Hemiptera, Coccomorpha) from China, ZooKeys 1174, pp. 301-314 : 301

Aulacaspis Cockerell

Aulacaspis Cockerell, 1893: 180.

Type species.

Aspidiotus rosae Bouché: by subsequent designation by Newstead 1901: 168.

Generic diagnosis.

The following diagnosis is taken from Miller and Davidson (2005) and Takagi (2012). Female scale. White, circular, exuviae located on anterior end. Male scale. White, long, and narrow, exuviae located on anterior end. Adult female. Body elongate; derm membranous except for the margin of pygidium; prosoma generally swollen or wider than metathorax and abdomen, slightly squared in most species. Cephalothorax. Antennae each with a seta. Anterior spiracles usually with a cluster of trilocular pores, posterior spiracles with or without associated trilocular pores. Dorsal ducts present or absent on prosoma, scattered. Pygidium. Usually with three pairs of lobes (rarely with two or four pairs). Median lobes (L1) well developed, sunken into or protruding apex of pygidium, much larger than lobules of lateral lobes, zygotic basally or not, without marginal setae between lobes. In general, L1 are divided into two types depending on feeding site: bark-type, where individuals occur on bark and L1 protrudes at the end of the pygidium; and leaf-type, on leaves and L1 is sunken into the end of pygidium. Second lobes (L2) much smaller than L1, bilobed, divided into inner lobule and outer lobule, outer lobule usually smaller than inner lobule. Third lobes (L3) smaller than L2, bilobed, outer lobule smaller than inner lobule. Fourth lobes (L4) present in some species and usually represented by serrations along the body margin. Gland spines. Marginal gland spines developed, present on lateral of abdominal segment II and III; usually single on abdominal segments V-VIII, but in some species two or more. Marginal gland spines becoming shorter to conical on anterior segments; in some species they are called gland tubercles. Ducts. Dorsum with double-barred ducts. Marginal macroducts of pygidium usually larger than dorsal macroducts. Dorsal macroducts forming submedial and submarginal rows on abdominal segment and pygidium, sometimes occurring in two sizes. Dorsal ducts on the lateral margins of the second and the third abdominal segments. Ventral microducts scattered. Anal opening situated at the center of the pygidium, small. Perivulvar disc pores in five groups.

Remarks.

As in other members of the subtribe Chionaspidina , Aulacaspis species have median lobes often joined by a zygosis; without setae or gland spines or marginal macroducts between median lobes ( Miller and Davidson 2005; Takagi 2012). Aulacaspis is distinguished from other genera, especially from Chionaspis and Myrtaspis Takagi, 1999 by lacking lateral macroducts and gland spines on abdominal segment I and on the thorax, present in these locations on Chionaspis and Myrtaspis ( Takagi 1999).