Bizarrifrons wecksteini Valim and Palma,

Valim, Michel P. & Palma, Ricardo L., 2012, Redescriptions of two species and descriptions of three new species of the louse genus Bizarrifrons Eichler, 1938 (Phthiraptera: Ischnocera: Philopteridae), Zootaxa 3273, pp. 28-50: 37-38

publication ID 10.5281/zenodo.208835

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Bizarrifrons wecksteini Valim and Palma

sp. nov.

Bizarrifrons wecksteini Valim and Palma  , sp. nov.

( Figs 24–30View FIGURES 24 – 25View FIGURES 26 – 30)

Type host: Psarocolius bifasciatus bifasciatus (Spix, 1824)  —Amazonian oropendola

Diagnosis. Within the magus  -group, this species is morphologically close to B. magus  in the length of the conus at most reaching the end of the first antennal segment ( Figs 24, 25View FIGURES 24 – 25). The conus is longer than the first antennal segment in the remaining species of this species group ( B. francisi  , B. clayae  and B. meinertzhageni  ). However, Bizarrifrons wecksteini  sp. nov. can be easily distinguished from B. magus  by the configuration of the mesomere in the male genitalia (compare Figs 13View FIGURES 11 – 17 and 28View FIGURES 26 – 30), the number of setae on tergites VII –VIII, and by the coloration of tergite IX+X in females.

Description. Male. Habitus as in Fig. 24View FIGURES 24 – 25, coloration similar to Fig. 5View FIGURES 5 – 8. Anterior portion of the head distinctly asymmetric ( Fig. 24View FIGURES 24 – 25). Conus long, at most reaching the distal margin of the scape. Antennal flagellomeres distinctly more pigmented than the pedicel, the latter slightly more pigmented than the scape. Pterothorax with the posterior margin brownish and with 7–9 setae on each side. Episterna II and III strongly pigmented. Tergites well developed, with their internal margins rounded, except for VII –VIII slightly pointed; with distinct pigmentation, except for large round areas around the spiracles. Postspiracular setae present on segments IV –VII, with alveoli only on IV and V. Tergal chaetotaxy uniform with some individual variation, as follows (on each side): II –III with 1 innermost posterior seta; IV –V with 1 innermost posterior seta and a postspiracular setae (rarely with 1 postspiracular accessory only on one side of the IV or V segment); VI with 1 inner posterior, 2–4 (rarely 1 in one side) outer posterior, a postspiracular setae and 1 postspiracular accessory; VII with 1 inner posterior, 5–7 outer posterior, 1 postspiracular setae and 1 postspiracular accessory (rarely missing the postspiracular accessory in one side); VIII with 9–12 posterior and a trichobothrium latero-posterior; IX+X with 11–15 setae, 1 (rarely 2 only on one side) of them longer than the others. The postero-internal angle of tergites VII –IX+X distinctly bent downwards; tergites IX+X as a very narrow, sclerotized band tapering proximally ( Fig. 26View FIGURES 26 – 30). One pair of sclerites around the genital opening, small and centrally positioned, sub-rounded to sub-square, the second anterior pair present but barely distinguishable as a small and thin sclerotized band ( Fig. 26View FIGURES 26 – 30). Sternal plates on II –VI well developed, laterally rounded and well pigmented. Sternal chaetotaxy (on each side): segments II –VI with 1 medium long setae. Paratergal chaetotaxy (on each side): segments II –III without setae; IV –V, 2 setae (three setae on both sides in one paratype); VI –VIII, 3; IX+X, 2 (rarely 1 in one side); terminal segment with 4–5 setae on dorsal and ventral sides. Genitalia as in Fig. 28View FIGURES 26 – 30; subgenital plate as in Fig. 27View FIGURES 26 – 30, with distinct fenestrae in one paratype ( DNA voucher, see Figs 26 and 27View FIGURES 26 – 30), but the subgenital plate in other specimens was not clearly distinguishable due to their pale colouration ( Fig. 24View FIGURES 24 – 25). The paratype specimen referred above has a long seta on only one side of the subgenital plate ( Figs 26 and 27View FIGURES 26 – 30); this seta is absent in all other specimens and in other species of Bizarrifrons  . Measurements (n = 4): POL, 0.28–0.31; POW, 0.37–0.39; TW, 0.52–0.55; HL, 0.57–0.61; DPW, 0.09–0.11; PW, 0.32–0.35; MW, 0.48–0.52; AWV, 0.62–0.69; BAL, 0.20–0.25; PL, 0.13–0.15; GW, 0.14–0.16; GL, 0.34–0.38; TL, 1.69–1.79. Female. Habitus as in Fig. 25View FIGURES 24 – 25, coloration similar to Fig. 6View FIGURES 5 – 8. Head as in Fig. 25View FIGURES 24 – 25. Similar to the male, but differing in tergal chaetotaxy and terminal segments. Tergites IX+X medially fused, with a shallow anterior notch in the midline and largely white in colouration ( Figs 25View FIGURES 24 – 25 and 29View FIGURES 26 – 30). Tergal chaetotaxy (on each side): segments II –III with 1 innermost posterior seta; IV –VII with 1 innermost posterior seta and a postspiracular setae; VIII with 1 innermost posterior seta and a trichobothrium latero-posterior; IX+X with 4 setae (three in one side), 3 (or one) of them small, only reaching the terminal plates, and 2 very long, reaching beyond the end of the abdomen. Postero-internal angle of each tergite II –VIII truncated, roughly square. Subgenital plate tapering from its rounded base ( Fig. 30View FIGURES 26 – 30), with 3–4 small setae laterad, on each side ( Fig. 29View FIGURES 26 – 30). Vulvar margin with 9–10 short marginal setae, and 11–13 short spiniform submarginal setae forming a single row on the distal margin, on each side ( Fig. 29View FIGURES 26 – 30). Measurements (n = 1): POL, 0.31; POW, 0.39; TW, 0.57; HL, 0.63; DPW, 0.11; PW, 0.34; MW, 0.52; AWV, 0.70; TL, 2.24.

Remarks. Uncorrected p -distances between Bizarrifrons wecksteini  sp. nov. and B. picturatus  (see below) were 16 % for the COI gene, and 1 % for EF- 1 ɑ. These are the first DNA sequences published for any species of Bizarrifrons  . The great percentage divergence for COI indicates a high degree of genetic distinctiveness between these taxa, as already shown for species within another genus of the Brueelia  -complex (e.g. Valim & Weckstein 2011).

Type material. Male holotype, ex Psarocolius bifasciatus bifasciatus  , PPBIO 120 MPEG 61970; BRAZIL: Pará, Portel, FLONA do Caxiuanã, Plot PPBIO (01° 57 ' S; 51 ° 36 'W), 17.I. 2007, J.D. Weckstein coll. Paratypes: 4 males (one DNA voucher Bisp.Psbi.8.25.2011.2) and 1 female, same data as holotype. Two paratype males (which include the DNA voucher) in FMNH, the remaining type specimens in MZUSP.

Etymology. This species is named after Jason D. Weckstein (Field Museum of Natural History, Chicago, USA) in recognition of his interest in louse systematics, and for collecting the type specimens and making them available to us.


Department of Natural Resources, Environment, The Arts and Sport


University of Coimbra Botany Department


Museu Paraense Emilio Goeldi


Field Museum of Natural History


Museu de Zoologia da Universidade de Sao Paulo