Bromusicoccus Kaydan

Kaydan, Mehmet Bora & Szita, Éva, 2017, Mealybugs (Hemiptera: Coccomorpha: Pseudococcidae) with oral rim ducts; description of a new genus and species from Turkey, and discussion of their higher classification within the Pseudococcidae, Zootaxa 4227 (3), pp. 444-450 : 445-446

Genus Bromusicoccus Kaydan gen. n.

Type species. Bromusicoccus gulsunae Kaydan sp. n.

Generic diagnosis. Slide-mounted adult female: body broadly oval, 1.20–1.46 mm long, 0.58–0.64 mm wide. Antenna 7 segmented. Labium 3 segmented, longer than wide. Legs well developed; hind coxa bearing translucent pores; claw without a denticle; tarsal and claw digitules both capitate, claw digitules thicker than tarsal digitules. Circulus present. Oral rim tubular ducts present on both dorsum and venter. Oral collar tubular ducts present on venter. Multilocular disc pores present on venter. Trilocular pores numerous. Quinquelocular pores absent.

Dorsum. Body setae flagellate. Anterior and posterior ostioles present, well developed. Cerarii absent. Anal ring bearing 6 anal ring setae. Trilocular pores scattered. Minute discoidal pores usually present. Oral rim tubular ducts present in rows across abdominal segments. Oral collar ducts and multilocular disc pores absent.

Venter. Body setae flagellate. Trilocular pores scattered. Minute discoidal pores scattered throughout. Oralcollar tubular ducts present in rows across abdominal segments. Oral rim tubular ducts present on submargins of thorax. Oral collar ducts present in rows across abdominal segments, reaching to margins; in mesal areas of thorax and on submargins of prothorax. Multilocular disc pores present on posterior abdominal segments, especially around vulva.

Etymology. The name of the genus is derived from the host plant of the type species, Bromus sp. ( Poaceae ).

Comments. Bromusicoccus Kaydan gen. n. is characterized by the following combination of character-states: (i) complete absence of cerarii, (ii) oral rim tubular ducts present on both dorsum and venter, (iii) oral collar tubular ducts present on venter only, (iv) 7-segmented antennae, and (v) anal ring normally with a considerable number of cells. The new genus differs from all other genera that have oral rim tubular ducts by the absence of cerarii from both the body margin and the dorsum. Bromusicoccus is closest to some species of Humococcus (namely: H. atriplicis Ferris, 1953 ; H. caritus McKenzie, 1960 ; H. ceraricus McKenzie, 1964 ; H. dasychloae ( Ferris, 1953) ; H. greensladeae Williams, 1985 ; H. inornatus McKenzie, 1960 ; H. orientalis ( Borchsenius, 1949) and H. porterae (Cockerell, 1901)) in having oral rim tubular ducts on the body surface, but differs from Humococcus in having a complete anal ring containing a considerable number of cells. Bromusicoccus is also close to Chorizococcus , Spilococcus and Vryburgia in having oral rim tubular ducts in rows across the dorsal segments, but differs from all three of these genera in lacking cerarii entirely.

Bromusicoccus is also close to Mirococcopsis innermongolica (previously known as Spilococcus innermongolica ); M. multicircularia ; M. mackenziei (previously known as Humococcus mackenziei , but considered to be part of Mirococcopsis by Danzig & Gavrilov-Zimin and Humococcus petilus ( Brookes, 1976) in having oral rim tubular ducts and a fully developed anal ring, and incompletely lacking cerarii. These features are important generic-level characters so these species might be transferred to the new genus; however, this is not being done here. It is believed that this group needs further molecular and morphological studies with more taxa before making any such decisions.