Guimaraesiella (Cicchinella) mcgrewi 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 : 484-487

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

( Figs 82–89 )

Type host. Alcippe morrisonia Swinhoe, 1863 —grey-cheeked fulvetta ( Leiothrichidae ).

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

Diagnosis. Guimaraesiella (C.) mcgrewi is most similar to Guimaraesiella (C.) iuga (see below) with which it shares the following characters: (1) proximal mesosome widening proximally, with concave lateral margins and convex anterior margin ( Figs 87 , 94 ); (2) rugose area of mesosome forms distinct nodi that protrude beyond margin of mesosome ( Figs 87 , 94 ); and (3) gonopore distinct, with no comb-like lateral structures ( Figs 87 , 94 ). However, these two species can be separated by the following characters: (1) mesosome broader and with flatter anterior margin in G. (C.) mcgrewi ( Fig. 87 ) than in G. (C.) iuga ( Fig. 94 ); (2) gonopore small, with triangular posterolateral extensions in G. (C.) mcgrewi ( Fig. 87 ) but with quadratic antero-lateral extensions in G. (C.) iuga ( Fig. 94 ); (3) basal apodeme more slender in G. (C.) iuga ( Fig. 93 ) than in G. (C.) mcgrewi ( Fig. 86 ); (4) parameral heads with prominent anterior bulge in G. (C.) mcgrewi ( Fig. 88 ) but with only slight anterior bulge in G. (C.) iuga ( Fig. 95 ); (5) dorsal preantennal suture reaches lateral margin of head in G. (C.) mcgrewi ( Fig. 84 ) but not in G. (C.) iuga ( Fig. 92 ); (6) female tergopleurite XI fused with tergopleurite IX+X in G. (C.) mcgrewi ( Fig. 83 ) but not fused in G. (C.) iuga ( Fig. 91 ); and (7) antennae sexually dimorphic in G. (C.) mcgrewi ( Figs 84–85 ) but not dimorphic in G. (C.) iuga ( Fig. 92 ).

Description. Both sexes. Head broadly bulb-shaped ( Fig. 84 ). Lateral margins of preantennal head concave. Dorsal preantennal suture reaches lateral margins of head, but does not completely separate dorsal anterior plate from main head plate. Head chaetotaxy as in Fig. 84 ; pns microsetae. Coni long and broad, not reaching distal margin of scape. Antennae sexually dimorphic. Gular plate sinuously triangular. Thoracic and abdominal segments as in Figs 82–83 . Reentrant heads of pleurites broad and long.

Male. Scape as in Fig. 84 . Thoracic and abdominal chaetotaxy as in Fig. 82 . Genitalia as in Figs 86–88 . Basal apodeme broad ( Fig. 86 ), widening distally, with rounded proximal margin. Proximal mesosome trapezoidal ( Fig. 87 ), widening proximally, with concave lateral margins and slightly convex proximal margin. Ventral sclerite absent. Mesosomal lobes wide, convex. Marginal thickenings of mesosomal lobes displaced medianly in anterior end. Rugose area forms distinct nodus on each side, extending beyond mesosomal margin. Elongated nodi on distal end of mesosome. Gonopore with pointed postero-lateral extensions; ames and gpmes not visible in examined material; 1 lpmes microseta visible on each side, anterior to rugose nodi; second lpmes may be obscured by rugose nodi. Parameral heads much displaced posteriorly ( Fig. 88 ); anterior bulge large. Parameral blades broad, tapering only distally; pst1–2 far apart. Measurements (n = 2): TL = 1.26–1.27; HL = 0.34; HW = 0.35–0.36; PRW = 0.21– 0.22; PTW = 0.32; AW = 0.48–0.49.

Female. Scape as in Fig. 85 . Thoracic and abdominal chaetotaxy as in Fig. 83 . Tergopleurite IX+X fused medially with tergopleurite XI ( Fig. 83 ). Subgenital plate as in Fig. 89 , without reticulation; cross-piece with narrow connection to subgenital plate. Vulval margin ( Fig. 89 ) convergent to median point, with 3–4 short, slender vms on each side, and 7–8 short, thorn-like vss on each side; 4–5 vos on each side; distal vos situated anterior to vss. Measurements (n = 2 except AW where n = 1): TL = 1.60–1.66; HL = 0.37–0.38; HW = 0.39–0.40; PRW = 0.22; PTW = 0.35; AW = 0.48.

Etymology. The species epithet is in honor of Stanley E. McGrew (Mountain Green, Utah, U.S.A.), in recognition of his interest in, and support for, all things scientific.

Type material. Ex Alcippe morrisonia : Holotype ♂, Shiwan Dashan National Park, Guangxi Province, China, 20 Apr. 2005, S.E. Bush & D.H. Clayton, P-879 (NHML). Paratypes: 1♂, 2♀, same data as holotype (PIPeR).

Remarks. Following Zou et al. (2007), many recent checklists—including Clements et al. (2017) —have divided Alcippe morrisonia into several species, with A. morrisonia restricted to Taiwan and A. davidi schaefferi La Touche, 1923 , occurring in Guangxi. However, on recommendation from Mark B. Robbins (pers. comm., 2017), who identified the hosts, we retain the type host species as Alcippe morrisonia , considering that the taxonomy of this complex is still not well known.

Figures

FIGURES 82–83. Guimaraesiella (Cicchinella) mcgrewi n. sp. 82, male, whole body, dorsal and ventral views. 83, female, whole body, dorsal and ventral views.

FIGURES 84–89. Guimaraesiella (Cicchinella) mcgrewi n. sp. 84, male head, dorsal and ventral views. 85, female antenna, ventral view. 86, male genitalia, dorsal view. 87, male mesosome, ventral view. 88, male paramere, dorsal view. 89, female subgenital plate and vulval margin, ventral view.

FIGURES 92–96. Guimaraesiella (Cicchinella) iuga n. sp. 92, male head, dorsal and ventral views. 93, male genitalia, dorsal view. 94, male mesosome, ventral view. 95, male paramere, dorsal view. 96, female subgenital plate and vulval margin, ventral view.

FIGURES 90–91. Guimaraesiella (Cicchinella) iuga n. sp. 90, male, whole body, dorsal and ventral views. 91, female, whole body, dorsal and ventral views.