Guimaraesiella (Cicchinella) iuga 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 : 487-490

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

( Figs 90–96 )

Type host. Alcippe peracensis peracensis Sharpe, 1887 —mountain fulvetta ( Leiothrichidae ).

Type locality. Terengganu, Malaysia .

Diagnosis. Guimaraesiella (C.) iuga is most similar to G. (C.) mcgrewi , with which it shares the characters listed under the latter species, above. However, these two species can be separated by the following characters: (1) dorsal preantennal suture reaches lateral margin of head in G. (C.) mcgrewi ( Fig. 84 ) but not in G. (C.) iuga ( Fig. 92 ); (2) female tergopleurite XI fused with tergopleurite IX+X in G. (C.) mcgrewi ( Fig. 83 ) but not in G. (C.) iuga ( Fig. 91 ); (3) antennae sexually dimorphic in G. (C.) mcgrewi ( Figs 84–85 ) but not in G. (C.) iuga ( Fig. 92 ); (4) basal apodeme more slender in G. (C.) iuga ( Fig. 93 ) than in G. (C.) mcgrewi ( Fig. 86 ); (5) proximal mesosome with more pronounced convex anterior margin in G. (C.) iuga ( Fig. 94 ) than in G. (C.) mcgrewi ( Fig. 87 ); (6) mesosome proportionally broader in G. (C.) mcgrewi ( Fig. 87 ) than in G. (C.) iuga ( Fig. 94 ); (7) gonopore with quadratic antero-lateral extensions in G. (C.) iuga ( Fig. 94 ) but with triangular postero-lateral extensions in G. (C.) mcgrewi ( Fig. 87 ); and (8) parameral heads with prominent anterior bulge in G. (C.) mcgrewi ( Fig. 88 ) but with only slight anterior bulge in G. (C.) iuga ( Fig. 95 ).

Description. Both sexes. Head broadly trapezoidal ( Fig. 92 ). Lateral margins of preantennal head concave. Dorsal preantennal suture does not reach lateral margins of head, and does not completely separate dorsal anterior plate from main head plate. Head chaetotaxy as in Fig. 92 ; pns microsetae. Coni long and broad, reaching beyond distal margin of scape. Antennae not sexually dimorphic. Gular plate triangular. Thoracic and abdominal segments as in Figs 90–91 . Reentrant heads of pleurites short, blunt, broad.

Male. Thoracic and abdominal chaetotaxy as in Fig. 90 . Genitalia as in Figs 93–95 . Basal apodeme comparatively slender ( Fig. 93 ), rounded, with slight constrictions at about mid-length. Proximal mesosome with deeply concave lateral margins and distinctly convex anterior margin ( Fig. 94 ). Ventral sclerite absent. Mesosomal lobes comparatively slender, convex. Marginal thickenings of mesosomal lobes displaced medianly in anterior end. Rugose area forms distinct nodus on each side that slightly extends beyond mesosomal margins. Elongated nodi on distal mesosome slender. Gonopore uniquely shaped, with large quadratic antero-lateral extensions and small hookshaped extensions distally; 2 ames sensilla on each side near antero-lateral corners of mesosomal lobes; 1 gpmes on each side of gonopore; lpmes not visible in examined material. Parameral heads irregular ( Fig. 95 ), with slight anterior bulge. Parameral blades broad, tapering only distally; pst1–2 far apart. Measurements (n = 4): TL = 1.10– 1.20; HL = 0.32–0.34; HW = 0.32–0.34; PRW = 0.19–0.20; PTW = 0.29–0.31; AW = 0.40–0.43.

Female. Thoracic and abdominal chaetotaxy as in Fig. 91 ; ss of tergopleurite VIII nearly as long as ss of tergopleurites II–VII. Subgenital plate as in Fig. 96 ; cross-piece with narrow connection to subgenital plate. Crosspiece very pale, in some specimens entirely transparent. Vulval margin gently rounded ( Fig. 96 ), with 3–4 slender vms on each side, and 7–9 thorn-like vss on each side; 4 vos on each side; distal vos median to vss. Measurements (n = 8): TL = 1.41–1.58 HL = 0.35–0.37; HW = 0.36–0.40; PRW = 0.21–0.23; PTW = 0.32–0.35; AW = 0.48–0.53.

Etymology. The species epithet is derived from “ iugum ”, Latin for “yoke”, referring to the large, yoke-like gonopore.

Type material. Ex Alcippe peracensis peracensis : Holotype ♂, Terengganu, 102° 37’ E, 5° 25’ N, Malaysia, 4 Mar. 1974, Gunung Lawit Expedition , Brit. Mus. 1974-2 (NHML). Paratypes: 2♀, same data as holotype ( NHML) ; 2♂, 3♀, Terengganu, 102° 36’ E, 5° 25’ N, Malaysia, 14 Mar. 1974, Gunung Lawit Expedition , Brit. Mus. 1974-2 ( NHML) ; 1♂, 3♀, Terengganu, 102° 36’ E, 5° 25’ N, Malaysia, 16 Mar. 1974, Gunung Lawit Expedition , Brit. Mus. 1974-2 ( NHML) .

Figures

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

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