Guimaraesiella (Cicchinella) pallidobrunneis Gustafsson, Clayton

Gustafsson, Daniel R., Clayton, Dale H. & Bush, Sarah E., 2019, Twelve new species of Guimaraesiella (Phthiraptera: Ischnocera: Philopteridae) from “ babblers ” (Passeriformes: Leiothrichidae, Pellorneidae, Timaliidae) with a description of a new subgenus and a key to its species, Zootaxa 4543 (4), pp. 451-497 : 469

Guimaraesiella (Cicchinella) pallidobrunneis Gustafsson, Clayton & Bush, new species

( Figs 39–46 )

Type host. Heterophasia melanoleuca melanoleuca (Blyth, 1859) —black-backed sibia ( Leiothrichidae ).

Type locality. Doi Pui , Chiang Mai Province, Thailand .

Diagnosis. Guimaraesiella (C.) pallidobrunneis is most similar to G. (C.) avinus , with which it shares the following characters: (1) lateral margins of preantennal head convex ( Figs 33 , 41 ); (2) antennae sexually dimorphic ( Figs 33–34 , 41–42 ); (3) pns microsetae ( Figs 33 , 41 ); (4) female subgenital plate without reticulation ( Figs 38 , 46 ); (5) proximal mesosome rounded ( Figs 36 , 44 ); and (6) distal trapezoidal nodi of mesosome of similar shape ( Figs 36 , 44 ). However, these two species can be separated by the following characters: (1) ss of female tergopleurite VIII short in G. (C.) avinus ( Fig. 32 ) but long in G. (C.) pallidobrunneis ( Fig. 40 ); (2) basal apodeme broad, rectangular in G. (C.) avinus ( Fig. 35 ) but slender and more rounded in G. (C.) pallidobrunneis ( Fig. 43 ); (3) proximal mesosome with straight lateral margins in G. (C.) avinus ( Fig. 36 ) but with irregular lateral margins in G. (C.) pallidobrunneis ( Fig. 44 ); (4) mesosomal ventral sclerite with distinct marginal thickenings seemingly continuous with the marginal thickenings of the lobes in G. (C.) pallidobrunneis ( Fig. 44 ) but without such thickening in G. (C.) avinus ( Fig. 36 ); and (5) ames microsetae in G. (C.) pallidobrunneis ( Fig. 44 ) but sensilla in G. (C.) avinus ( Fig. 36 ).

Description. Both sexes. Head flat-dome shaped ( Fig. 41 ). Lateral margins of preantennal area convex. Dorsal preantennal suture reaches lateral margins of head, but does not completely separates dorsal anterior plate from main head plate. Attachments of mandibular adductor muscles prominent. Head chaetotaxy as in Fig. 41 ; pns microsetae. Coni short and broad, not approaching distal margin of scape. Antennae slightly sexually dimorphic. Thoracic and abdominal segments as in Figs 39–40 . Reentrant heads of pleurites broad, rather short.

Male. Scape as in Fig. 41 . Thoracic and abdominal chaetotaxy as in Fig. 39 . Male genitalia as in Figs 43–45 . Basal apodeme slender ( Fig. 43 ), rounded proximally. Proximal mesosome widened proximally ( Fig. 44 ), rounded, with irregular lateral margins. Ventral sclerite tapering, with marginal thickening seemingly continuous with marginal thickenings of mesosomal lobes. Mesosomal lobes with strongly sinuous lateral margins. Marginal thickenings of mesosomal lobes not displaced medianly in anterior end. Large trapezoidal nodi with almost straight anterior margins on distal mesosome. Gonopore as in Fig. 44 ; 2 ames microsetae on each side near antero-lateral corners of mesosomal lobes; gpmes not visible in examined material; 2 lpmes microsetae on each side on concave section of lateral margins of mesosomal lobes. Parameral heads irregular ( Fig. 45 ). Parameral blades slender, tapering only distally; pst1–2 close together. Measurements (n = 1): TL = 1.14; HL = 0.32; HW = 0.31; PRW = 0.19; PTW = 0.28; AW = 0.42.

Female. Scape as in Fig. 42 . Thoracic and abdominal chaetotaxy as in Fig. 40 ; ss of tergopleurite VIII as long as ss of tergopleurites II–VII. Subgenital plate as in Fig. 46 ; cross-piece with moderate connection to subgenital plate. Slight folds medianly on cross-piece. Vulval margin gently rounded ( Fig. 46 ), with 3–4 slender vms on each side, and 7–8 thorn-like vss on each side; 4 slender vos on each side; distal vos situated anterior to vss. Measurements (n = 1): TL = 1.49; HL = 0.36; HW = 0.36; PRW = 0.21; PTW = 0.31; AW = 0.47.

Etymology. The species epithet is derived from “ pallidus ”, Latin for “pale”, and “ brunneis ”, Latin for “brown”, referring to the pigmentation of this species.

Type material. Ex Heterophasia melanoleuca melanoleuca : Holotype Ƌ, Doi Pui, Chiang Mai Province, Thailand, 11 Feb. 1965, H.E. McClure, SE-1950 (OSUS). Paratype: 1♀, same data as holotype ( OSUS) .

Figures

FIGURES 39–40. Guimaraesiella (Cicchinella) pallidobrunneis n. sp. 39, male, whole body, dorsal and ventral views. 40, female, whole body, dorsal and ventral views.

FIGURES 41–46. Guimaraesiella (Cicchinella) pallidobrunneis n. sp. 41, male head, dorsal and ventral views. 42, female antenna, ventral view. 43, male genitalia, dorsal view. 44, male mesosome, ventral view. 45, male paramere, dorsal view. 46, female subgenital plate and vulval margin, ventral view.

FIGURES 33–38. Guimaraesiella (Cicchinella) avinus (Ansari, 1956). 33, male head, dorsal and ventral views. 34, female antenna, ventral view. 35, male genitalia, dorsal view. 36, male mesosome, ventral view. 37, male paramere, dorsal view. 38, female subgenital plate and vulval margin, ventral view.

FIGURES 31–32. Guimaraesiella (Cicchinella) avinus (Ansari, 1956). 31, male, whole body, dorsal and ventral views. 32, female, whole body, dorsal and ventral views.

FIGURES 1–2. Guimaraesiella (Cicchinella) sehri (Ansari, 1955). 1, male, whole body, dorsal and ventral views. 2, female, whole body, dorsal and ventral views.