Guimaraesiella (Cicchinella) scottvillai 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 : 463-466

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

( Figs 23–30 )

Type host. Liocichla steerii Swinhoe, 1877 —Steere’s liocichla ( Leiothrichidae ).

Type locality. Wu-sheh , Taiwan .

Diagnosis. Guimaraesiella (C.) scottvillai is most similar to Guimaraesiella (C.) philiproundi with which it shares the following characters: (1) lateral margins of preantennal head convex ( Figs 17 , 25 ); (2) dorsal preantennal suture does not reach lateral margins of head ( Figs 17 , 25 ); (3) antennae sexually dimorphic ( Figs 17–18 , 25–26 ); (4) pns microsetae ( Figs 17 , 25 ); (5) proximal mesosome rectangular with fairly straight lateral margins ( Figs 20 , 28 ); and (6) gpmes situated on marginal thickenings of gonopore ( Figs 20 , 28 ). However, these two species can be separated by the following characters: (1) male scape longer than wide in G. (C.) scottvillai ( Fig. 25 ) but about as long as wide in G. (C.) philiproundi ( Fig. 17 ); (2) female subgenital plate reticulated in G. (C.) philiproundi ( Fig. 22 ) but not in G. (C.) scottvillai ( Fig. 30 ); (3) ames microsetae in G. (C.) scottvillai ( Fig. 28 ) but sensilla in G. (C.) philiproundi ( Fig. 20 ); (4) distal nodi of mesosome triangular in G. (C.) scottvillai ( Fig. 28 ) but trapezoidal in G. (C.) philiproundi ( Fig. 20 ); and (5) basal apodeme more slender in G. (C.) scottvillai ( Fig. 27 ) than in G. (C.) philiproundi ( Fig. 19 ).

Description. Both sexes. Head flat-dome shaped ( Fig. 25 ). Lateral margins of preantennal head convex. Dorsal preantennal suture does not reach lateral margins of head, and does not completely separate dorsal anterior plate. Head chaetotaxy as in Fig. 25 ; pns microsetae. Coni short, not reaching distal margin of scape. Antennae sexually dimorphic ( Figs 25–26 ). Gular plate broad, triangular. Thoracic and abdominal segments as in Figs 23–24 . Reentrant heads of pleurites large.

Male. Scape as in Fig. 25 . Thoracic and abdominal chaetotaxy as in Fig. 23 . Male genitalia as in Figs 27–29 . Basal apodeme slender ( Fig. 27 ), rounded rectangular. Proximal mesosome rectangular ( Fig. 28 ), lateral margins fairly straight. Mesosomal lobes with strongly sinuous lateral margins. Marginal thickenings not displaced medianly in anterior end. Large triangular nodi with oblique anterior margins on distal mesosome. Gonopore as in Fig. 28 ; 2 ames microsetae on each side near antero-lateral corner of mesosomal lobes; 1 gpmes sensillus on each side situated on marginal thickenings of gonopore; 2 lpmes microsetae on each side in concave section of lateral margin of mesosomal lobes. Parameral heads irregular ( Fig. 29 ), narrowing proximally. Parameral blades with bulging median margin, tapering only distally, and with distinct fold on median margin; pst1–2 close together. Measurements (n = 1): TL = 1.24; HL = 0.35; HW = 0.37; PRW = 0.23; PTW = 0.35; AW = 0.53.

Female. Scape as in Fig. 26 . Abdominal chaetotaxy as in Fig. 24 ; ss of tergopleurite VIII much shorter than ss of tergopleurites II–VII. Subgenital plate as in Fig. 30 ; cross-piece with broad connection to subgenital plate. Vulval margin gently rounded ( Fig. 30 ), with 3 slender vms on each side, and 8 thorn-like vss on each side; 3–5 slender vos on each side; distal vos anterior to vss. Measurements (n = 1): TL = 1.58; HL = 0.39; HW = 0.41; PRW = 0.23; PTW = 0.35; AW = 0.54.

Etymology. The species epithet is in honor of our friend and colleague Dr Scott M. Villa (University of Utah, Salt Lake City, Utah, U.S.A.) in recognition of his work on the evolution of pigeon lice.

Type material. Ex Liocichla steerii : Holotype Ƌ, Wu-sheh, Taiwan [as Formosa], 1959, PF-6083 (OSUS). Paratype: 1♀, same data as holotype ( OSUS) .

Figures

FIGURES 23–24. Guimaraesiella (Cicchinella) scottvillai n. sp. 23, male, whole body, dorsal and ventral views. 24, female, whole body, dorsal and ventral views.

FIGURES 25–30. Guimaraesiella (Cicchinella) scottvillai n. sp. 25, male head, dorsal and ventral views. 26, female antenna, ventral view. 27, male genitalia, dorsal view. 28, male mesosome, ventral view. 29, male paramere, dorsal view. 30, female subgenital plate and vulval margin, ventral view.

FIGURES 17–22. Guimaraesiella (Cicchinella) philiproundi n. sp. 17, male head, dorsal and ventral views. 18, female antenna, ventral view. 19, male genitalia, dorsal view. 20, male mesosome, ventral view. 21, male paramere, dorsal view. 22, female subgenital plate and vulval margin, ventral view.

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