Guimaraesiella ( Dicrurobates ) nana Gustafsson, 2020

Guimaraesiella ( Dicrurobates) nana Gustafsson & Bush, new species

( Figs 43–49 View FIGURES 43–44 View FIGURES 45–49 )

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Type host. Dicrurus hottentottus samarensis Vaurie, 1947 —hair-crested drongo.

Type locality. Mount Lobi Range , Tambis Burauen, Leyte Island, Philippines .

Diagnosis. Guimaraesiella ( Dicrurobates) nana is morphologically closest to Guimaraesiella ( Di.) lurida and Guimaraesiella ( Di.) regis n. sp. (see below). However, it can be separated from Guimaraesiella ( Di.) lurida by the following characters: (1) dorsal preantennal suture reaching ads in Guimaraesiella ( Di.) nana ( Fig. 45 View FIGURES 45–49 ), but not in Guimaraesiella ( Di.) lurida ( Fig. 31 View FIGURES 31–35 ); (2) aps present in male tergopleurite V and female tergopleurite VIII in Guimaraesiella ( Di.) lurida ( Figs 29–30 View FIGURES 29–30 ), but absent on these segments in Guimaraesiella ( Di.) nana ( Figs 43–44 View FIGURES 43–44 ); (3) proximal mesosome with more or less straight anterior margin and anteriorly rounded ventral sclerite in Guimaraesiella ( Di.) nana ( Fig. 47 View FIGURES 45–49 ), but wide, with markedly concave anterior margin and anteriorly flat ventral sclerite in Guimaraesiella ( Di.) lurida ( Fig. 33 View FIGURES 31–35 ).

Also, Guimaraesiella ( Dicrurobates) nana can be separated from Guimaraesiella ( Di.) regis by the following characters: (1) dorsal preantennal suture reaches the lateral margins of head in Guimaraesiella ( Di.) regis ( Fig. 52 View FIGURES 52–56 ), but not in Guimaraesiella ( Di.) nana ( Fig. 45 View FIGURES 45–49 ); (2) ventral anterior plate broader than long in Guimaraesiella ( Di.) nana ( Fig. 45 View FIGURES 45–49 ), but longer than broad in Guimaraesiella ( Di.) regis ( Fig. 52 View FIGURES 52–56 ); (3) aps absent on male tergopleurite V in Guimaraesiella ( Di.) nana ( Fig. 43 View FIGURES 43–44 ), but present on this tergopleurite in Guimaraesiella ( Di.) regis ( Fig. 50 View FIGURES 50–51 ); (4) male abdominal segment IV with 2 ps on each side in Guimaraesiella ( Di.) nana ( Fig. 43 View FIGURES 43–44 ), but with 1 ps on each side in Guimaraesiella ( Di.) regis ( Fig. 50 View FIGURES 50–51 ); (5) mesosome similar but more slender in Guimaraesiella ( Di.) nana ( Fig. 47 View FIGURES 45–49 ) than in Guimaraesiella ( Di.) regis ( Fig. 54 View FIGURES 52–56 ). Females can be separated by the shape of the head ( Figs 44. 51 View FIGURES 43–44 View FIGURES 45–49 View FIGURES 50–51 ) and the subgenital plate ( Figs 49 View FIGURES 45–49 , 56 View FIGURES 52–56 ).

Description. Both sexes. Head shape and chaetotaxy as in Fig. 45 View FIGURES 45–49 . Lateral margins of preantennal head straight to slightly convex, frons broadly flattened; marginal carina broad, irregular; dorsal preantennal suture reaches dsms and ads, but not lateral margin of head; ventral preantennal plate large, broadly crescent-shaped; coni broad, long; temples rounded; gular plate broadly rhombic with anterior and lateral points ( Fig. 45 View FIGURES 45–49 ). Thoracic and abdominal segments as in Figs 43–44 View FIGURES 43–44 .

Male. Thoracic and abdominal chaetotaxy as in Fig. 43 View FIGURES 43–44 ; aps absent on tergopleurites IV–V, but present on tergopleurites VI–VII. Genitalia as in Figs 46–48 View FIGURES 45–49 : basal apodeme oval, not constricted at mid-length, and with rounded anterior end ( Fig. 46 View FIGURES 45–49 ). Proximal mesosome broad, narrowing distally, and with convex lateral margins; ventral sclerite broadly rounded, not reaching anterior margin of mesosome; mesosomal lobes roughly triangular, with prominent but only slightly rugose lateral nodi; 2 ames sensilla on each side near anterior margin of mesosomal lobes; 2 pmes sensilla on each side of gonopore, near rugose nodi; gonopore obovoid, with broad marginal thickening. Parameral heads rounded, subtriangular ( Fig. 48 View FIGURES 45–49 ). Parameral blades slender, tapering only distally ( Figs 46, 48 View FIGURES 45–49 ). Measurements: Ex Dicrurus hottentottus samarensis (n = 11, except TL, where n = 9): TL = 1.22–1.48; HL = 0.29–0.40 (0.37); HW = 0.31–0.36 (0.34); PRW = 0.20–0.23 (0.22); PTW = 0.29–0.32 (0.31); AW = 0.40–0.47 (0.43).

Female. Thoracic and abdominal chaetotaxy as in Fig. 44 View FIGURES 43–44 ; psps absent on tergopleurite VIII. Subgenital plate slightly trapezoidal in anterior section; lateral submarginal bulges slender, pointed; vulval margin gently rounded, with 3–4 slender vms on each side, the most median vms much shorter than other vms; 5–7 short, thorn-like vss on each side; 5–6 short, slender vos on each side; distal 1 vos anterior to vss, much longer than other vos ( Fig. 49 View FIGURES 45–49 ). Measurements: Ex Dicrurus hottentottus samarensis (n = 29, except TL, where n = 23, and AW, where n = 28): TL = 1.40–1.78 (1.58); HL = 0.38–0.43 (0.41); HW = 0.33–0.40 (0.36); PRW = 0.20–0.24 (0.22); PTW = 0.24–0.36 (0.30); AW = 0.41–0.57 (0.49).

Etymology. The species epithet derives from “ nanus ” Latin for “dwarf”, referring to the relatively small size of this species compared to other members of Guimaraesiella ( Dicrurobates) .

Type material. Ex Dicrurus hottentottus samarensis [as D. hottentottus striatus ]: Holotype ♂, Mount Lobi Range, Tambis Burauen, Leyte Island, Philippines, 3 May 1964, D.S. Rabor, B-90 ( BPBM). Paratypes: 4♂, 18♀, same data as holotype ( BPBM) ; 2♂, 3♀, same data, B-90 ( BPBM) ; 1♂, 13♀, same data, B-77 ( BPBM) ; 3♂, 3♀, same data ( BPBM) .