Guimaraesiella (Dicrurobates) regis Gustafsson, 2020

Gustafsson, Daniel R. & Bush, Sarah E., 2020, A new subgenus and eight new species of Guimaraesiella Eichler, 1949 (Phthiraptera: Ischnocera: Philopteridae: Brueelia-complex), Zootaxa 4885 (2), pp. 151-188 : 176-179

Guimaraesiella (Dicrurobates) regis Gustafsson & Bush, new species

( Figs 50–56 )

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Type host: Dicrurus annectans (Hodgson, 1836) —crow-billed drongo.

Other hosts. Dicrurus paradiseus paradiseus (Linnaeus, 1766) —greater racket-tailed drongo. Dicrurus paradiseus rangoonensis (Gould, 1836) —greater racket-tailed drongo.

Type locality. Muang Thung Nui , Satun Province, Thailand .

Diagnosis. Guimaraesiella (Dicrurobates) regis is morphologically closest to Guimaraesiella (Di.) nana , but they can be separated by the following characters: (1) dorsal preantennal suture reaches lateral margins or head in Guimaraesiella (Di.) regis ( Fig. 52 ), but not in Guimaraesiella (Di.) nana ( Fig. 45 ); (2) aps present on male tergopleurite V in Guimaraesiella (Di.) regis ( Fig. 50 ), but absent on this tergopleurite in Guimaraesiella (Di.) nana ( Fig. 43 ); (3) mesosome more slender in Guimaraesiella (Di.) nana ( Fig. 47 ) than in Guimaraesiella (Di.) regis ( Fig. 54 ); (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 ). Females can be separated by the shape of the head and of the subgenital plate ( Figs 35 , 42 ).

Description. Both sexes. Head shape and chaetotaxy as in Fig. 52 . Lateral margins of preantennal head straight to slightly convex, frons broadly flattened to concave; marginal carina broad, irregular, narrowing anteriorly; dorsal preantennal suture reaches dsms, ads, and lateral margins of head; ventral anterior plate long, with deeply concave anterior margin; coni short, broad; temples rounded; gular plate as in Fig. 52 . Thoracic and abdominal segments as in Figs 50–51 .

Male. Thoracic and abdominal chaetotaxy as in Fig. 50 ; aps typically absent on tergopleurite IV, but present on tergopleurites V–VII. Genitalia as in Figs 53–55 : basal apodeme rectangular, with rounded anterior end and slight or no constriction at mid-length ( Fig. 53 ). Proximal mesosome broad, narrowing distally, with convex lateral margins ( Fig. 54 ); ventral sclerite broadly trapezoidal, lateral margins slightly convex, not reaching anterior margin of mesosome; mesosomal lobes wide, roughly triangular; rugose nodi prominent; 2 ames sensilla on each side near anterolateral corners of mesosomal lobes; 2 pmes sensilla on each side of gonopore, near rugose nodi; gonopore round, with broad marginal thickening ( Fig. 54 ). Parameral heads rounded subtriangular ( Fig. 55 ). Parameral blades broad, tapering only distally ( Figs 53, 55 ). Measurements: Ex Dicrurus annectans (n = 4): TL = 1.56; HL = 0.40–0.41; HW = 0.35–0.36; PRW = 0.22; PTW = 0.30–0.32; AW = 0.42–0.46. Ex Dicrurus paradiseus paradiseus (n = 3): TL = 1.58–1.65; HL = 0.39–0.42; HW = 0.35–0.37; PRW = 0.22–0.23; PTW = 0.31–0.32; AW = 0.46–0.49. Ex Dicrurus paradiseus rangoonensis (n = 1): TL = 1.63; HL = 0.41; HW = 0.36; PRW = 0.23; PTW = 0.33; AW = 0.48.

Female. Thoracic and abdominal chaetotaxy as in Fig. 51 ; psps absent from tergopleurite VIII. Subgenital plate with concave lateral margins in anterior section and irregular medio-lateral margins; lateral submarginal bulges rounded, not wide; vulval margin gently rounded, with 2–4 short, slender vms on each side and 5–7 short, thorn-like vss on each side; 4–6 slender vos on each side; distal 1 vos median to vss, much shorter than other vos ( Fig. 56 ). Measurements: Ex Dicrurus annectans (n = 9): TL = 1.74–2.22; HL = 0.42–0.44; HW = 0.38–0.41; PRW = 0.22–0.24; PTW = 0.32–0.37; AW = 0.45–0.52. Ex Dicrurus paradiseus paradiseus (n = 10, except TL and AW, where = 9): TL = 1.69–1.99; HL = 0.41–0.48 (0.45); HW = 0.37–0.42 (0.39); PRW = 0.22–0.26 (0.24); PTW = 0.32–0.37 (0.35); AW = 0.47–0.55. Ex Dicrurus paradiseus rangoonensis (n = 4): TL = 1.80–1.85; HL = 0.42–0.44; HW = 0.37–0.39; PRW = 0.23–0.24; PTW = 0.35–0.37; AW = 0.49–0.53.

Etymology. The species epithet derives from “ rex ” Latin for “king”, referring to the large head of this species.

Type material. Ex Dicrurus annectans : Holotype ♂, Muang Thung Nui, Satun Province, Thailand, 23 Sep. 1963, W. Songprakob & W.S. Laong, WS-525 ( NHML) . Paratypes: 1♂, 2♀, same data as holotype ( NHML) ; 3♂, 7♀, same data as holotype ( PIPR) .

Non-type material. Ex Dicrurus paradiseus paradiseus : 1♂, 9♀, Thadinang , Pak Phayun District, Phattalung Province, Thailand, 27 Jul. 1962, W. Songprakob, RE-6343 ( PIPR); 2♂, 2♀, Khao Soi Dao Tai, Chanthaburi Prov-ince, Thailand, Apr. 1966 ( NHML) .

Ex Dicrurus paradiseus rangoonensis [some as D. paradiseus malabaricus ]: 1♂, 2♀, Phu Lom Lo Mountains, Kok Sathon, Dan Sai District, Loei Province, Thailand, 17 Feb. 1955, R.E. Elbel, RE-4680, RT-B-31210 ( BPBM); 1♀, Pang Nam Un, Bun Yun, Nan Province, Thailand, 17 Jan. 1953, R.E. Elbel & H.G. Deignan, RE-2095, RTB-17712 ( BPBM); 2♀, Khlong Khlung, Kamphaeng Phet Province, Thailand, 27 Apr. 1953, R.E. Elbel & H.G. Deignan, RE-2487, RT-B-21051 ( BPBM).

Remarks. Dicrurus annectans and D. paradiseus are closely related, as shown in the phylogeny of Pasquet et al. (2007), where D. annectans is nested inside D. paradiseus .

Figures

FIGURES 50–51. Guimaraesiella (Dicrurobates) regis new species. 50, male habitus, dorsal and ventral views. 51, female habitus, dorsal and ventral views.

FIGURES 52–56. Guimaraesiella (Dicrurobates) regis new species. 52, male head, dorsal and ventral views. 53, male genitalia, dorsal view. 54, male mesosome, ventral view. 55, male paramere, dorsal view. 56, female subgenital plate and vulval margin, ventral view.

FIGURES 45–49. Guimaraesiella (Dicrurobates) nana new species. 45, male head, dorsal and ventral views. 46, male genitalia, dorsal view. 47, male mesosome, ventral view. 48, male paramere, dorsal view. 49, female subgenital plate and vulval margin, ventral view.

FIGURES 43–44. Guimaraesiella (Dicrurobates) nana new species. 43, male habitus, dorsal and ventral views. 44, female habitus, dorsal and ventral views.

FIGURES 31–35. Guimaraesiella (Dicrurobates) lurida new species. 31, male head, dorsal and ventral views. 32, male genitalia, dorsal view. 33, male mesosome, ventral view. 34, male paramere, dorsal view. 35, female subgenital plate and vulval margin, ventral view.

FIGURES 38–42. Guimaraesiella (Dicrurobates) luzonica new species. 38, male head, dorsal and ventral views. 39, male genitalia, dorsal view. 40, male mesosome, ventral view. 41, male paramere, dorsal view. 42, female subgenital plate and vulval margin, ventral view.