Guimaraesiella (Cicchinella) philiproundi Gustafsson, Clayton

Gustafsson, Daniel R., Clayton, Dale H. & Bush, Sarah E., 2019, Twelve new species of Guimaraesiella (Phthiraptera: Ischnocera: Philopteridae) from “ babblers ” (Passeriformes: Leiothrichidae, Pellorneidae, Timaliidae) with a description of a new subgenus and a key to its species, Zootaxa 4543 (4), pp. 451-497 : 458-463

Guimaraesiella (Cicchinella) philiproundi Gustafsson, Clayton & Bush, new species

( Figs 15–22)

Type host. Trochalopteron melanostigma schistaceum (Deignan, 1938) —silver-eared laughing-thrush ( Leiothrichidae ).

Type locality. Doi Pha Hom Pok , Chiang Mai Province, Thailand .

Other host. Trochalopteron peninsulae Sharpe, 1887 —Malayan laughing-thrush ( Leiothrichidae ).

Diagnosis. Guimaraesiella (C.) philiproundi is most similar to Guimaraesiella (C.) retusa . However, these two species can be separated by the following characters: (1) lateral margins of preantennal head convex in G. (C.) philiproundi ( Fig. 17) but straight to slightly concave in G. (C.) retusa ( Fig. 10); (2) dorsal preantennal suture reaches lateral margins of head in G. (C.) retusa ( Fig. 10) but not in G. (C.) philiproundi ( Fig. 17); (3) antennae sexually dimorphic in G. (C.) philiproundi ( Figs 17–18) but not in G. (C.) retusa ( Fig. 10); (4) reticulation of female subgenital plate more extensive and prominent in G. (C.) philiproundi ( Fig. 22) than in G. (C.) retusa ( Fig. 14); (5) proximal mesosome with fairly straight lateral margins in G. (C.) philiproundi ( Fig. 20) but with sinuous lateral margins in G. (C.) retusa ( Fig. 12); and (6) mesosomal ventral sclerite narrow in G. (C.) philiproundi ( Fig. 20) but broad in G. (C.) retusa ( Fig. 12).

Description. Both sexes. Head flat-dome shaped ( Fig. 17). Dorsal preantennal suture does not reach lateral margins of head, nor completely separate dorsal anterior plate from main head plate. Attachment of mandibular adductor muscles prominent. Head chaetotaxy as in Fig. 17; pns microsetae. Coni short and broad, not reaching distal margin of scape. Gular plate narrowly triangular. Thoracic and abdominal segments as in Figs 15–16. Reentrant heads broad and long.

Male. Scape as in Fig. 17. Thoracic and abdominal chaetotaxy as in Fig. 15. Male genitalia as in Figs 19–21. Basal apodeme broad ( Fig. 19), roughly rectangular. Proximal mesosome broad ( Fig. 20), rectangular, with fairly straight lateral margins. Ventral sclerite slender. Mesosomal lobes with slightly sinuous lateral margins. Marginal thickenings of mesosomal lobes not displaced medianly in anterior end. Large trapezoidal nodi with fairly straight anterior margins on distal mesosome. Gonopore as in Fig. 20; 2 ames sensilla on each side near antero-lateral corners of mesosomal lobes; 1 gpmes sensillus on each side of gonopore, situated on marginal thickening of gonopore; 2 lpmes microsetae laterally on each side immediately anterior to trapezoidal nodi. Parameral heads irregular ( Fig. 21), narrowing proximally. Parameral blades bulging along median margin, tapering only distally; pst1–2 situated close together. Measurements ex Trochalopteron melanostigma schistaceum (n = 2): TL = 1.18– 1.20; HL = 0.33–0.35; HW = 0.33–0.34; PRW = 0.21–0.22; PTW = 0.33; AW = 0.45–0.50. Measurements ex Trochalopteron peninsulae (n = 2): TL = 1.17–1.24; HL = 0.33–0.35; HW = 0.34–0.36; PRW = 0.22; PTW = 0.32– 0.33; AW = 0.45–0.49.

Female. Scape as in Fig. 18. Thoracic and abdominal chaetotaxy as in Fig. 16; ss of tergopleurite VIII much shorter than ss of tergopleurites II–VII. Setae of tergopleurite IX+X absent in single examined female and here included tentatively based on setae in other species of the group. Subgenital plate as in Fig. 22; cross-piece with broad connection to main plate. Much of anterior subgenital plate reticulated. Vulval margin gently rounded ( Fig. 22), with 3 slender vms on each side, and 4–8 thorn-like vss on each side; 3–4 slender vos on each side; distal vos situated median to vss. Measurements ex Trochalopteron melanostigma schistaceum (n = 1): TL = 1.47; HL = 0.37; HW = 0.36; PRW = 0.22; PTW = 0.33; AW = 0.51. Measurements ex Trochalopteron peninsulae (n = 1): TL = 1.51; HL = 0.37; HW = 0.37; PRW = 0.22; PTW = 0.34; AW = 0.50.

Etymology. The species epithet is in honor of Dr Philip D. Round (Mahidol University, Bangkok, Thailand), in recognition of his work with birds in Thailand, and for introducing DRG to the birdlife of Thailand when he was stranded in Bangkok during a collection trip.

Type material. Ex Trochalopteron melanostigma schistaceum [as Garrulax erythrocephalus ]: Holotype Ƌ, Doi Pha Hom Pok, Chiang Mai Province, Thailand, 15 Nov. 1965, MAPS-2556, 24751 on reverse (OSUS). Paratypes: 1♂, same locality as for the holotype, 29 Nov. 1965, MAPS-2846, 24750 on reverse ( OSUS) ; 1♀, same locality as for the holotype, 12 Nov. 1965, MAPS-2484, 24749 on reverse ( OSUS) .

Additional material examined (non-types). Ex Trochalopteron peninsulae : 1♂, Gunung Benom, elev. 5,000 ft, Malaysia, 20 Mar. 1967, BN-372, Brit. Mus. 1967-400 (NHML); 1♂, 1♀, same locality, 28 Mar. 1967, BA33, Brit. Mus. 1967-400 ( NHML) .

Remarks. Guimaraesiella (C.) philiproundi is the only species in the subgenus Cicchinella that occurs on more than one host species. However, both host species were until recently considered subspecies of the polytypic Trochalopteron erythrocephalum (Vigors, 1832) ( Collar 2006; Clements et al. 2015). We have found no morphological characters that can reliably separate the material from T. melanostigma from that of T. peninsulae ; therefore, we regard all samples from both hosts as conspecific.