Guimaraesiella (Cicchinella) tenella 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 : 490-493

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

( Figs 97–103 )

Type host. Cyanoderma ruficeps davidi (Oustalet, 1899) —rufous-capped babbler ( Timaliidae ).

Type locality. Shiwan Dashan National Park , Guangxi Province, China .

Diagnosis. Guimaraesiella (C.) tenella is neither similar to any species of the subgenus Cicchinella , nor to any other known species of Guimaraesiella , having a unique male genitalia within the Brueelia -complex. Further, it can be separated from all other species of Cicchinella on the following combination of characters: (1) dorsal anterior plate completely separated from main head plate ( Fig. 99 ); (2) abdomen slender in both sexes ( Figs 97– 98 ); (3) margins of sternites IV–VI in males and III–VI in females with darkly pigmented bands ( Figs 97–98 ); (4) aps absent from male tergopleurite IV ( Fig. 97 ); (5) female subgenital plate of unique shape ( Fig. 103 ); (6) mesosomal ventral sclerite extends beyond anterior margin of mesosome ( Fig. 101 ); (7) marginal thickenings of mesosomal lobes absent ( Fig. 101 ); (8) distal nodi of mesosomal lobes shaped as arches (AN in Fig. 101 ); and (9) mesosome with lateral rugose nodi ( Fig. 101 ).

Description. Both sexes. Head trapezoidal ( Fig. 99 ). Lateral margins of preantennal head concave. Dorsal preantennal suture reaches lateral margins of head and completely separates dorsal anterior plate from main head plate. Head chaetotaxy as in Fig. 99 ; pns microsetae. Coni long and broad, almost reaching distal margin of scape. Antennae not sexually dimorphic. Gular plate rounded triangular. Thoracic and abdominal segments as in Figs 97– 98 . Reentrant heads of pleurites long and slender. Sternites IV–VI in male and sternites V–VI in female with dark pigmentation on anterior and posterior margins; female sternites III–IV with dark pigmentation only on posterior margin (grey lines in Figs 97–98 ).

Male. Thoracic and abdominal chaetotaxy as in Fig. 97 . Genitalia as in Figs 100–102 . Basal apodeme comparatively slender ( Fig. 100 ), rectangular. Proximal mesosome trapezoidal ( Fig. 101 ), wider anteriorly. Ventral sclerite present, slender, extending beyond proximal margin of mesosome. Mesosomal lobes slender, with sinuous lateral margins. Marginal thickenings of mesosomal lobes absent. Small lateral rugose area near distal end of mesosomal lobes. Distal nodi of mesosome arched. Gonopore longer than broad, open distally; 2 ames microsetae on each side near midline in anterior end of mesosomal lobes; 1 gpmes microseta on each side of gonopore; 1 lpmes long microseta on lateral margin of mesosome, distal to rugose area. Parameral heads irregular ( Fig. 102 ), large. Parameral blades broad, tapering only distally; pst1–2 close together. Measurements (n = 1): TL = 1.42; HL = 0.36; HW = 0.33; PRW = 0.19; PTW = 0.28; AW = 0.43.

Female. Thoracic and abdominal chaetotaxy as in Fig. 98 . Subgenital plate of unique shape ( Fig. 103 ), not reticulated; cross-piece with slender connection to subgenital plate Vulval margin ( Fig. 103 ) only slightly rounded, with 3–4 long, slender vms on each side, and 4–5 long, thorn-like vss on each side; 6 long, slender vos on each side; distal 2 vos median to vss. Measurements (n = 1): TL = 1.82 HL = 0.39; HW = 0.38; PRW = 0.21; PTW = 0.31; AW = 0.46.

Etymology. The species epithet derives from “ tenellus ”, Latin for “tender, delicate”, referring to the slender body, head, and male genitalia of this species.

Type material. Ex Cyanoderma ruficeps davidi : Holotype Ƌ, Shiwan Dashan National Park, Guangxi Province, China, 25 Apr. 2005, S.E. Bush & D.H. Clayton, host MBR-6714, lice P-991 (NHML). Paratype: 1♀, same data as holotype (PIPeR).

Figures

FIGURES 97–98. Guimaraesiella (Cicchinella) tenella n. sp. 97, male, whole body, dorsal and ventral views. 98, female, whole body, dorsal and ventral views.

FIGURES 99–103. Guimaraesiella (Cicchinella) tenella n. sp. 99, male head, dorsal and ventral views. 100, male genitalia, dorsal view. 101, male mesosome, ventral view. 102, male paramere, dorsal view. 103, female subgenital plate and vulval margin, ventral view. Abbreviation: AN = arched nodus.