Aporisticeras 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: 314-315

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Aporisticeras Gustafsson & Bush

new genus

Aporisticeras Gustafsson & Bush  , new genus

Brueelia Kéler, 1936a: 257  (in partim).

Type species. Brueelia athertona Williams, 1981 

Diagnosis. Aporisticeras  n. gen. is most similar to Couala  n. gen., but both genera are very distinct, and similarities may be superficial. No representative of Aporisticeras  was included in the phylogeny of Bush et al. (2016), and its position within the Brueelia- complex is unknown.

Aporisticeras  ( Fig. 526View FIGURES 526 – 531) and Couala  ( Figs 514View FIGURES 514 – 517, 520View FIGURES 520 – 523) share the following head characters: dorsal preantennal suture absent; ventral carinae continuous with marginal carina; marginal carina displaced at osculum; pns present, microsetae; preocular nodi prominent; mandibular adductor muscles prominent. In addition, while the proximal mesosome does not appear to be fused to the basal apodeme in Aporisticeras  ( Figs 527–528View FIGURES 526 – 531) as it is in Couala  ( Figs 515–516View FIGURES 514 – 517, 521–522View FIGURES 520 – 523), the structure is very similar between the two genera, especially between Aporisticeras  and Couala dodekopter  n. sp. ( Figs 515–516View FIGURES 514 – 517), as is the fact that the mesosomal lobes are not very prominent, much wider than long, and both have gonopores that are similar in size relative to the mesosome. However, there are differences in the abdominal chaetotaxy ( Table 2), and head chaetotaxy, with as3 present in Aporisticeras  ( Fig. 526View FIGURES 526 – 531), but absent in Couala  ( Figs 514View FIGURES 514 – 517, 520View FIGURES 520 – 523). Antennal canals are absent in Aportisticeras ( Fig. 526View FIGURES 526 – 531), but present in Couala  ( Figs 514View FIGURES 514 – 517, 520View FIGURES 520 – 523), and while the mst2 is modified in Couala  , it is not in Aportisticeras. The female subgenital plate in Aporisticeras  ( Fig. 531View FIGURES 526 – 531) forms a broad cross-piece at the vulval margin, but no such cross-piece is present in Couala  ( Figs 517View FIGURES 514 – 517, 523View FIGURES 520 – 523); however, in both genera the vss are microsetae, and not thorn-like. Many of the characters of the male genitalia of Aporisticeras  ( Figs 527–530View FIGURES 526 – 531) are unique within the Brueelia  -complex, and these characters separate Aporisticeras  from all other genera treated here: parameres wrinkled with diaphanous median margins ( Fig. 530View FIGURES 526 – 531); ventral transversal sclerite connected to anterior portion of main mesosome ( Fig. 528View FIGURES 526 – 531); small hole penetrating dorsal surface of mesosome dorsal to gonopore; 3 pst present on each paramere, two sensilla and one terminal microseta.

Description. Both sexes. Head broad, rounded triangular ( Fig. 526View FIGURES 526 – 531). Marginal carina uninterrupted; displaced dorsally and posteriorly at osculum. Dorsal preantennal suture absent. Ventral anterior plate absent. Ventral carinae continuous with marginal carina. Head setae as in Fig. 526View FIGURES 526 – 531. Coni small. Antennae monomorphic. Temporal carinae not visible; mts  3 only macrosetae. Gular plate pentagonal, with prominent median point.

Prothorax ( Figs 524–525View FIGURES 524 – 525) rectangular. ppss on posteto-lateral corners. Proepimera slender; median ends blunt or hook-shaped. Pterothorax trapezoidal; lateral margins divergent; posterior margin flat or slightly rounded; mms widely separated medianly. Meso- and metasterna fused; 2 setae on each side. Metepisterna moderate; median ends blunt. Leg chaetotaxy as in Fig. 25View FIGURES 25, except fI-p2, fI-v4, fII-v2, fIII-v2, absent.

Abdomen oblong ( Figs 524–525View FIGURES 524 – 525). Abdominal chaetotaxy as in Table 2 and Figs 524–525View FIGURES 524 – 525. Tergopleurites rectangular; tergopleurites II –IX+X in male and tergopleurites II –VIII in female moderately separated medianly; tergopleurites IX+X and XI fused in female. Sternal plates rectangular, do not approach pleurites. Pleural incrassations large. Ventral section of tergo-pleurites broad. Re-entrant heads slight, broad. Male subgenital plate roughly rectangular, lateral margins irregular, reaching posterior margin of abdomen. Female subgenital plate oval, reaching vulval margin where it flares into broad cross-piece ( Fig. 531View FIGURES 526 – 531). Vulval margin with slender vms, thorn-like vss; vos follow lateral margins of subgenital plate, not approaching vss ( Fig. 531View FIGURES 526 – 531).

Basal apodeme ( Fig. 527View FIGURES 526 – 531) rounded rectangular. Proximal mesosome small, convex. Anterior transverse sclerite (ATS in Fig. 528View FIGURES 526 – 531) across proximal mesosome unique in Brueelia  -complex. Gonopore ( Fig. 528View FIGURES 526 – 531) prominent, terminal, margins not thickened, open distally. Mesosomal lobes wide, overlapping parameres. Distal transverse sclerite (DTS in Fig. 528View FIGURES 526 – 531) just posterior and dorsal to gonopore unique in Brueelia  -complex; ames absent; 2 pmes microsetae on lateral margins of mesosomal lobes. Parameral heads ( Figs 529–530View FIGURES 526 – 531) blunt, with distinct grove into which the lateral ends of mesosomal lobes fit. Parameral blades convergent, median margin diaphanous in proximal section, lateral margin with ventral wrinkles; 3 pst per paramere, 2 as central sensilla and 1 as a terminal microseta.

Host distribution. Aporisticeras  is monotypic, known only from two species of bee-eaters in the genus Nyctyornis Jardine & Selby, 1830  .

Geographical range. South and Southeast Asia. 

Etymology. Aporisticeras  is formed by the Greek prefix “ aporeía ” for “puzzlement, confusion”, referring to the general structure of the male genitalia ( Fig. 527View FIGURES 526 – 531), which are very different from those of other members of the Brueelia  -complex and difficult to interpret, together with the Greek suffixes “ istío ” for “sail” and “ kérato ” for horn, referring to the sail-shaped parameres ( Figs 529–530View FIGURES 526 – 531). Gender: masculine.

Included species

* Aporisticeras athertona ( Williams, 1981: 517)  n. comb. [in Brueelia  ]












Aporisticeras Gustafsson & Bush

Bush, Sarah E. 2017

Brueelia Kéler, 1936a : 257

Keler 1936: 257

Aporisticeras athertona ( Williams, 1981: 517 )

Williams 1981: 517