Bush, Gustafsson & Clayton & Bush, 2019

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 : 453

Cicchinella Gustafsson, Clayton & Bush , new subgenus

Type species: Guimaraesiella sehri ( Ansari, 1955) ex Trochalopteron lineatum lineatum (Vigors, 1831) .

Diagnosis. The subgenera Guimaraesiella (Guimaraesiella) and G. ( Cicchinella ) share the following morphological characters in common: (1) as3 absent; (2) pns present; (3) parameral heads folded medianly; (4) aps present on male tergopleurites V–VII; and (5) dorsal preantennal suture present, may reach ads, dsms, and lateral margin of head, and may completely separate dorsal anterior plate from main head plate.

However, Guimaraesiella (Cicchinella) can be separated from G. ( Guimaraesiella ) by the following characters: (1) female subgenital plate with cross-piece in G. ( Cicchinella ) ( Fig. 7 ) but without cross-piece in G. ( Guimaraesiella ) (fig. 360 in Gustafsson & Bush 2017 ); (2) gonopore clearly ventral in G. ( Cicchinella ) ( Fig. 5 ) but terminal in G. ( Guimaraesiella ) (fig. 358 in Gustafsson & Bush 2017 ); (3) mesosomal lobes absent or very small, not fused distally in G. ( Guimaraesiella ) (fig. 358 in Gustafsson & Bush 2017 ) but large and fused, often with conspicuous nodi in terminal end in G. ( Cicchinella ) ( Fig. 5 ); and (4) aps present on male tergopleurite IV in G. ( Cicchinella ) ( Fig. 1 ; except G. (C.) tenella n. sp., Fig. 97 ) but absent in G. ( Guimaraesiella ) (fig. 354 in Gustafsson & Bush 2017 ).

Description. Both sexes. Head typically pentagonal ( Fig. 3 ); but general head shape differing between species. Marginal carina interrupted at least medianly. Dorsal preantennal suture reaches dsms and ads. Ventral carinae typically diffuse anteriorly. Ventral anterior plate present. Head setae as in G. ( Guimaraesiella ); as3 absent; pns present. Coni variable. Antennae sexually dimorphic some species (e.g. Figs 17–18 ). Temporal carinae not visible. Gular plate generally triangular. Thoracic and abdominal segments largely as in G. ( Guimaraesiella ), except leg setae fI-v3, fII-v2, fIII-v2 present ( Figs 1–2 ).

Male. Abdominal chaetotaxy as in G. ( Guimaraesiella ), except for aps present on tergopleurite IV in all species (e.g. Fig. 1 ), except G. (C.) tenella ( Fig. 97 ). Male genitalia distinct ( Figs 4–6 ), differing slightly between species groups. Basal apodeme rectangular ( Fig. 11 ) to rounded ( Fig. 43 ). Proximal mesosome broad, typically much overlapping with distal basal apodeme. Mesosomal lobes large, elongated distally and fused distal to gonopore ( Fig. 5 ). Lateral margins of mesosome irregular. Gonopore ventral, often with elaborate structures. Ventral sclerite (VS in Fig. 5 ) present, but varying in shape between species groups. Up to 2 ames sensilla or microsetae visible on each side near antero-lateral corner of mesosomal lobes. Up to 1 pmes sensilla visible on each side of gonopore (gonoporal posterior mesosomal setae, gpmes in Fig. 5 ). Up to 2 pmes microsetae visible on lateral margins of mesosome (lateral posterior mesosomal setae, lpmes in Fig. 5 ). Both ames and pmes are hard to see in non-everted genitalia, and may be easily overlooked. Parameral heads ( Fig. 6 ) folded medianly, typically irregular in shape. In most species there is a papillate area (PA in Fig. 6 ) on the paramere distal to parameral head. Parameral blades stout, typically tapering gradually; pst1 sensillus and pst2 microseta or sensillus, both central, typically close together.

Female. Abdominal chaetotaxy as in G. ( Guimaraesiella ) except psps absent on tergopleurite VIII ( Fig. 2 ). Female genitalia as in G. ( Guimaraesiella ), except complete cross-piece present ( Fig. 7 ).

Host distribution. Species of the subgenus Guimaraesiella (Cicchinella) are known only from hosts within three families of Old World babblers: Leiothrichidae , Pellorneidae and Timaliidae .

Geographical range. Southeast Asia.

Etymology. The new subgenus, Cicchinella , is named honouring Armando C. Cicchino (Universidad Nacional de Mar del Plata, Argentina) in recognition of his long and productive career in phthirapterology. Gender masculine.

Remarks. All other members of Guimaraesiella (see Gustafsson & Bush 2017 ) are provisionally placed in the subgenus Guimaraesiella (Guimaraesiella) ; however, further division of Guimaraesiella into more subgenera may be necessary as more data on the morphological variation within this genus become available.

Figures

FIGURES 3–7. Guimaraesiella (Cicchinella) sehri (Ansari, 1955). 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: ARA = anterior rugose area; ames = anterior mesosomal setae; gpmes = gonoporal posterior mesosomal setae; lpmes = lateral posterior mesosomal setae; TN = triangular nodus; VS = mesosomal ventral sclerite.

FIGURES 1–2. Guimaraesiella (Cicchinella) sehri (Ansari, 1955). 1, male, whole body, dorsal and ventral views. 2, female, whole body, dorsal and ventral views.

FIGURES 97–98. Guimaraesiella (Cicchinella) tenella n. sp. 97, male, whole body, dorsal and ventral views. 98, female, whole body, dorsal and ventral views.

FIGURES 17–22. Guimaraesiella (Cicchinella) philiproundi n. sp. 17, male head, dorsal and ventral views. 18, female antenna, ventral view. 19, male genitalia, dorsal view. 20, male mesosome, ventral view. 21, male paramere, dorsal view. 22, female subgenital plate and vulval margin, ventral view.

FIGURES 10–14. Guimaraesiella (Cicchinella) retusa n. sp. 10, male head, dorsal and ventral views. 11, male genitalia, dorsal view. 12, male mesosome, ventral view. 13, male paramere, dorsal view. 14, female subgenital plate and vulval margin, ventral view.

FIGURES 41–46. Guimaraesiella (Cicchinella) pallidobrunneis n. sp. 41, male head, dorsal and ventral views. 42, female antenna, ventral view. 43, male genitalia, dorsal view. 44, male mesosome, ventral view. 45, male paramere, dorsal view. 46, female subgenital plate and vulval margin, ventral view.