Guimaraesiella pandolura Gustafsson & Bush

Bush, Sarah E., 2017, Morphological revision of the hyperdiverse Brueelia - complex (Insecta: Phthiraptera: Ischnocera: Philopteridae) with new taxa, checklists and generic key, Zootaxa 4313 (1), pp. 1-443: 231-234

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Guimaraesiella pandolura Gustafsson & Bush

new species

Guimaraesiella pandolura Gustafsson & Bush  , new species

( Figs 370–376View FIGURES 370 – 371View FIGURES 372 – 376)

Type host. Pericrocotus speciosus semiruber Whistler & Kinnear, 1933  —scarlet minivet. Type locality. Pang La, Lampang Province, Thailand.

Diagnosis. Only a few other species of Guimaraesiella have completely separated dorsal anterior plates: Guimaraesiella myiophoneae  , Guimaraesiella saltatora  , Guimaraesiella pallidula  , Guimaraesiella antiqua  , and the members of the Gu. brunneinucha  group. Of these, all species except Gu. myiophoneae  are found only in the New World. These New World species can be separated from Gu. pandolura  n. sp. ( Fig. 374View FIGURES 372 – 376) by the size and position of the gonopore; in Gu. pandolura  the gonopore is subterminal and dominates the distal mesosome, whereas the gonopore is much smaller and positioned ventrally in New World species ( Fig. 367View FIGURES 365 – 369).

Apart from the dorsal preantennal suture, no morphological characters places Guimaraesiella pandolura  particularly close to Gu. myiophoneae  . In Gu. pandolura  ( Fig. 372View FIGURES 372 – 376) the marginal carina is completely interrupted laterally, whereas in Gu. myiophoneae  it is complete ventrally. The mesosome of Gu. myiophoneae  is similar in shape to that of the Gu. sexmaculata  group ( Fig. 368View FIGURES 365 – 369), and the mesosomal lobes are much wider than the gonopore, unlike in Gu. pandolura  ( Fig. 374View FIGURES 372 – 376) where the mesosome is more slender. As in the Gu. sexmaculata  group, the gonopore of Gu. myiophoneae  is terminal and the mesosomal lobes are not fused distally, but the gonopore is set in a depression, with mesosomal lobes protruding distal to the gonopore; in Gu. pandolura  ( Fig. 374View FIGURES 372 – 376) the gonopore is subterminal and closed distally, but lobes do not protrude distal to the gonopore. In Gu. myiophoneae aps  are present on male tergopleurite V, but these are absent in Gu. pandolura  ( Fig. 370View FIGURES 370 – 371). The female vulval chaetotaxy of both species are very similar, and females are best told apart on head shape.

Description. Both sexes. Head shape, structure and chaetotaxy as in Fig. 372View FIGURES 372 – 376. Dorsal preantennal suture completely encircles dorsal anterior plate, separating it from main head plate. Ventral carina diffuse anterior to pulvinus. Preantennal nodi short, slender. Coni slender, reaching beyond distal margin of scapes. Preocular nodi large, quadratic. Postocular nodi moderate, clearly wider than very slender marginal temporal carina; pos located on nodi. Temporal carinae broad but diffuse. Gular plate small, star-shaped. Thoracic and abdominal segments as in genus description and Figs 370–371View FIGURES 370 – 371. Proepimera moderate, with pointed median ends. Metepisterna slender, with pointed median ends. Meso- and metasterna each with 1 long seta on posterior margin on each side. Pteronotum with 5 mms on each side.

Male. Subgenital plate with lateral indentation at about half length ( Fig. 370View FIGURES 370 – 371). Abdominal chaetotaxy as in Table 2 and Fig. 370View FIGURES 370 – 371. Male genitalia typical for genus ( Fig. 373View FIGURES 372 – 376). Basal apodeme slender. Proximal mesosome blunt, broad. Gonopore ( Fig. 374View FIGURES 372 – 376) closed distally. Ventral sclerite slender, with proximal thickening. Distal mesosome rugose; 3 ames sensilla visible on each side of mesosome; 2 pmes microsetae on lateral margins of mesosomal lobes. Parameral heads ( Fig. 375View FIGURES 372 – 376) trapezoidal, widening medianly. Parameral blades short, blunt distally; pst1–2 as in genus description. Measurements ex Pericrocotus speciosus semiruber  (n = 3): TL = 1.25– 1.33; HL = 0.37; HW = 0.36–0.38; PRW = 0.21–0.22; PTW = 0.30–0.31; AW = 0.39–0.45.

Female. Abdominal chaetotaxy as in Table 2 and Fig. 371View FIGURES 370 – 371. Subgenital plate ( Fig. 376View FIGURES 372 – 376) broadly triangular, reaching vulval margin. Vulval margin ( Fig. 376View FIGURES 372 – 376) somewhat pointed medianly, with 4–5 short, slender vms on each side, and 8–10 short, thorn-like vss on each side; 7–8 long, slender vos on each side; distal 2–3 vos median to vss. Measurements ex Pericrocotus speciosus semiruber  (n = 4): TL = 1.65–1.83; HL = 0.42–0.46; HW = 0.42–0.46; PRW = 0.23–0.27; PTW = 0.35–0.39; AW = 0.43–0.54.

Etymology. The species epithet is formed by Latin “ pando ” for “open, spread out, extend” and “ lura ” for “mouth of a bag”, referring to the shape of the preantennal area ( Figs 370–371View FIGURES 370 – 371).

Type material. Ex Pericrocotus speciosus semiruber  : Holotype ♂, Pang La, Lampang Province, Thailand, 3 Feb. 1953, R.E. Elbel & H.G. Deignan, RE-2223, RT-B-17745 ( OSUS)  . Paratypes: 3♂, 3♀, same data as holotype ( OSUS)  ; 1♂, 1♀, Pang La , Lampang Province, Thailand, 4 Feb. 1953, R.E. Elbel & H.G. Deignan, RE-2226, RT- B-17748 ( NHML)  ; 2♂, 1♀, same data as holotype (PIPeR)  ; 1♀, Ban Muang Khai , Tha Li District, Loei Province, Thailand, 13 Jan. 1953, R.E. Elbel, RE-4462, B-31103 (PIPeR)  ; 1♂, 1♀, Pang La , Lampang Province, Thailand, 4 Feb. 1953, R.E. Elbel & H.G. Deignan, RE-2226, RT-B-17748 (PIPeR). 

Remarks. We have examined a small number of Guimaraesiella specimens held in the NHML and PIPeR collections from the following Pericrorotus hosts: P. brevirostris brevirostris (Vigors, 1831)  , P. cinnamomeus thai Deignan, 1947  , P. ethologus laetus Mayr, 1940  , P. flammeus flammifer Hume, 1875  , P. flammeus gonzalesi Ripley & Rabor, 1961  , P. speciosus speciosus (Latham, 1790)  , and P. roseus stanfordi Vaughan & Jones, 1913  . None of these hosts have hitherto been recorded as harbouring Guimaraesiella or any other genus/species belonging to the Brueelia  -complex. These lice are very similar to Guimaraesiella pandolura  , but differ in dimensions and shape of the dorsal preantennal plate. However, available samples are not sufficient to establish whether they are conspecific with a variable Gu. pandolura  , or a different species. Furthermore, even material from other subspecies of Pericrocotus speciosus  from outside Thailand (e.g. Philippines, Burma and India) cannot be reliably placed in G. pandolura  , suggesting that there may be a high degree of geographical specificity in the Guimaraesiella lice parasitising Pericrocotus  hosts.


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