Guimaraesiella (Dicrurobates) nana Gustafsson & Bush, new species

(Figs 43–49)

urn:lsid:zoobank.org:act: DB544115-6FA9-42F0-BF19-F6AC47C3F120

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), but not in Guimaraesiella (Di.) lurida (Fig. 31); (2) aps present in male tergopleurite V and female tergopleurite VIII in Guimaraesiella (Di.) lurida (Figs 29–30), but absent on these segments in Guimaraesiella (Di.) nana (Figs 43–44); (3) proximal mesosome with more or less straight anterior margin and anteriorly rounded ventral sclerite in Guimaraesiella (Di.) nana (Fig. 47), but wide, with markedly concave anterior margin and anteriorly flat ventral sclerite in Guimaraesiella (Di.) lurida (Fig. 33).

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

Description. Both sexes. Head shape and chaetotaxy as in Fig. 45. 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). Thoracic and abdominal segments as in Figs 43–44.

Male. Thoracic and abdominal chaetotaxy as in Fig. 43; aps absent on tergopleurites IV–V, but present on tergopleurites VI–VII. Genitalia as in Figs 46–48: basal apodeme oval, not constricted at mid-length, and with rounded anterior end (Fig. 46). 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). Parameral blades slender, tapering only distally (Figs 46, 48). 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; 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). 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) .