Guimaraesiella (Dicrurobates) luzonica 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 : 170-173

Guimaraesiella (Dicrurobates) luzonica Gustafsson & Bush, new species

( Figs 36–42 )

urn:lsid:zoobank.org:act:B9CF3683-E3AF-47F1-9DFF-E1F9DA488255

Type host. Dicrurus balicassius (Linnaeus, 1766) —balicassiao.

Type locality. Luzon , Philippines .

Diagnosis. Guimaraesiella (Dicrurobates) luzonica is morphologically closest to Guimaraesiella (Di.) lurida and Guimaraesiella (Di.) sexmaculata . However, it can be separated from Guimaraesiella (Di.) sexmaculata by characters of the head ( Figs 3 , 38 ), the mesosome of the male genitalia ( Figs 5 , 40 ), and the shape of the female subgenital plate ( Figs 7 , 42 ). Also, Guimaraesiella (Di.) luzonica can be separated from Guimaraesiella (Di.) lurida by the following characters: (1) dorsal preantennal suture reaches ads in Guimaraesiella (Di) . luzonica ( Fig. 38 ), but does not reach ads in Guimaraesiella (Di.) lurida ( Fig. 31 ); (2) basal apodeme constricted at mid-length in Guimaraesiella (Di.) luzonica ( Fig. 39 ), but not constricted in Guimaraesiella (Di.) lurida ( Fig. 32 ); (3) proximal mesosome narrowing anteriorly, with anterior margin more or less straight in Guimaraesiella (Di.) luzonica ( Fig. 40 ), but widening anteriorly and with concave anterior margin in Guimaraesiella (Di.) lurida ( Fig. 33 ); (4) rugose areas of mesosomal lobes extensive in Guimaraesiella (Di.) luzonica ( Fig. 40 ), but restricted to sublateral bulges in Guimaraesiella (Di.) lurida ( Fig. 33 ).

Description. Both sexes. Head shape and chaetotaxy as in Fig. 38 . Lateral margins of preantennal area more or less straight, frons broadly flattened; marginal carina irregular, broad but narrowing anteriorly; preantennal suture reaches dsms and ads, but only approaches the lateral margins of head without reaching it; ventral anterior plate small, roughly crescent-shaped; coni slender; temples rounded; gular plate rounded triangular ( Fig. 38 ). Thoracic and abdominal segments as in Figs 36–37 .

Male. Thoracic and abdominal chaetotaxy as in Fig. 36 ; aps absent on tergopleurite IV but present on tergopleurites V–VII. Genitalia as in Figs 39–41 : basal apodeme rounded anteriorly, much constricted at mid-length ( Fig. 39 ). Proximal mesosome trapezoidal, with slightly concave lateral margins; ventral sclerite broad, with irregular lateral margins; anterior end almost reaches proximal margin of mesosome; mesosomal lobes slight, triangular; rugose nodi extensive; 2 ames sensilla on each side near antero-lateral corners of mesosomal lobes; 2 pmes sensilla on each side postero-lateral to gonopore, near rugose nodi; distal pmes may be on lateral margin of mesosome; gonopore broader than long, with broad marginal thickenings ( Fig. 40 ). Parameral heads roughly triangular ( Fig. 41 ). Parameral blades slender, tapering only distally ( Figs 39, 41 ). Measurements: Ex Dicrurus balicassius (n = 1): TL = 1.48; HL = 0.41; HW = 0.36; PRW = 0.23; PTW = 0.31; AW = 0.45.

Female. Thoracic and abdominal chaetotaxy as in Fig. 37 ; psps present on tergopleurite VIII. Subgenital plate roughly rectangular anteriorly; lateral submarginal bulges pointed; vulval margin gently rounded, with 3–4 short, slender vms on each side and 3–4 short, thorn-like vss on each side; 3–4 slender vos on each side; distal 1 vos an-terior to vss, much shorter than other vos ( Fig. 42 ). Measurements: Ex Dicrurus balicassius (n = 1; AW measured at segment VI due to distortion in specimen): TL = 1.68; HL = 0.43; HW = 0.38; PRW = 0.24; PTW = 0.33; AW = 0.47.

Etymology. The species epithet is a noun in apposition derived from the type locality.

Type material. Ex Dicrurus balicassius : Holotype ♂, Luzon, Philippines, 12 Aug. 1964, H.E. McClure, H-0024 ( NHML). Paratype 1♀, same data as holotype ( NHML) .

Figures

FIGURES 36–37. Guimaraesiella (Dicrurobates) luzonica new species. 36, male habitus, dorsal and ventral views. 37, female habitus, dorsal and ventral views.

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.

FIGURES 3–7. Guimaraesiella (Dicrurobates) sexmaculata (Piaget, 1880). 3, male head, dorsal and ventral views. 4, male genitalia, dorsal view. 5, male mesosome, ventral view. 6, male paramere, dorsal view. 7, female subgenital plate and vulval margin, ventral view.Abbreviations: ads = anterior dorsal seta; ames = anterior mesosomal setae; dsms = dorsal submarginal seta; mts3 = marginal temporal seta 3; pmes = posterior mesosomal setae; pns = post-nodal seta; pst1–2 = parameral setae 1–2; s4 = sensillus 4; vms = vulval marginal setae; vos = vulval oblique setae; vss = vulval submarginal setae.

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.