Ceratocista 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: 100-101

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Ceratocista Gustafsson & Bush

new genus

Ceratocista Gustafsson & Bush  , new genus

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

Type species. Brueelia antennatus Ansari, 1956a: 139 

Diagnosis. Ceratocista  n. gen. ( Figs 153–160View FIGURES 153 – 154View FIGURES 155 – 160) is most similar to Resartor  n. gen. ( Figs 161–167View FIGURES 161 – 162View FIGURES 163 – 167), and these two genera share the following characteristics: pos and pns absent; tps  absent in both sexes; marginal carina interrupted only submedianly and displaced section at osculum forms nail-like thickening of dorsal anterior plate; female subgenital plate flares into medianly displaced cross-piece; proximal mesosome slender; parameral blades slenderly triangular, somewhat extended distally; female tergopleurite IX+X fused with tergopleurite XI; sternal plate VI of both sexes with 2 sts. However, antennae are sexually dimorphic in Ceratocista  ( Figs 155–156View FIGURES 155 – 160) but not in Resartor  ( Fig. 163View FIGURES 163 – 167), and while ss are present on male tergopleurites II –VIII in Resartor  ( Fig. 161View FIGURES 161 – 162), these are present only on tergopleurites VII –VIII in Ceratocista  ( Fig. 153View FIGURES 153 – 154). In both genera the mesosomal lobes are extended laterally to overlap dorsally with the parameres, but Resartor  ( Fig. 165View FIGURES 163 – 167) does not have the large postero-lateral brush-like extensions of these lobes found in Ceratocista  ( Figs 157–158View FIGURES 155 – 160), nor are the antero-lateral triangular sections of the lobes found in Ceratocista  present in the male genitalia of Resartor  . The frons is clearly hyaline in Resartor  ( Fig. 163View FIGURES 163 – 167), whereas in Ceratocista  it is pale but apparently sceloritzed but translucent ( Fig. 155View FIGURES 155 – 160). Ventral anterior plate absent in Resartor  ( Fig. 163View FIGURES 163 – 167) but present in Ceratocista  ( Fig. 155View FIGURES 155 – 160).

The lateral extensions of the mesosomal lobes in Ceratocista  are similar to those found in Psammonirmus  n. gen. ( Fig. 150View FIGURES 148 – 152), but the differences between these two genera are substantial, and have been listed under Psammonirmus  .

Description. Both sexes. Head narrow, concave-dome shaped ( Fig. 155View FIGURES 155 – 160). Marginal carina broad, interrupted submedianly. Displaced section forms nail-like marginal carinal plate at osculum, delimited posteriorly by sinuous ridge. Dorsal preantennal suture arises from interruptions of marginal carina, not medianly continuous and not reaching ads or dsms. Ventral carinae with finger-like median protrusion; carinae diffuse anterior to pulvinus. Ventral anterior plate present. Head setae Fig. 155View FIGURES 155 – 160; avs2 much shorter than avs3; pos and pns absent. Antennae sexually dimorphic, with male scape ( Fig. 155View FIGURES 155 – 160) much elongated and thicker than female scape ( Fig. 156View FIGURES 155 – 160). Temporal carinae not visible; mts  3 only macrosetae. Gular plate roughly triangular.

Prothorax rectangular ( Figs 153–154View FIGURES 153 – 154); ppss on postero-lateral corner. Proepimera hammer-shaped medianly. Pterothorax pentagonal; lateral margins divergent and posterior margin convergent to median point ( Figs 153–154View FIGURES 153 – 154). Meso- and metasterna not fused, one seta on postero-lateral corner on each side of each plate. Metepisterna hammer-shaped medianly. mms moderately interrupted medianly. Leg chaetotaxy as in Fig. 25View FIGURES 25, except fI-p2, fI-v4 absent.

Abdomen ( Figs 153–154View FIGURES 153 – 154) broadly oval, much stockier in male than in female. Terminal end of abdomen rounded in male, deeply divided in female. Abdominal chaetotaxy as in Table 2. Tergopleurites II –IX+X in male and tergopleurites II –VIII in females narrowly divided medianly, rectangular, but more posterior tergopleurites in males triangular. Female tergopleurite IX+X fused to tergopleurite XI. Sternal plates medianly continuous, rectangular, approaching but not reaching pleurites. Pleural incrassations with dorsal and ventral median margins. Re-entrant heads moderate to large. Male subgenital plate triangular with lateral indentation on segment IX+X. Female subgenital plate trapezoidal ( Fig. 160View FIGURES 155 – 160), reaching vulval margin where it flares into a medianly displaced cross-piece.

Male genitalia as in Figs 157–159View FIGURES 155 – 160. Proximal mesosome slender, elongated. Gonopore open only distally. Mesosomal lobes large, overlapping with parameres dorsally, fringed on distal margin. 3 ames anterior to gonopore. Parameral heads blunt, with accessory sclerite. Parameral blades slenderly triangular; pst1–2 both sensilla, submarginal. 

Host distribution. Ceratocista  is presently known only from a single host species of the genus Grammatoptila Reichenbach, 1872  , in the family Timaliidae  .

Geographical distribution. Presently known only from South Asia. 

Etymology. Ceratocista  is formed by Greek “ kérato ” for “horn” and Latin “ cista ” for “chest”, referring both to the box-shaped head and the prominent male antennae ( Fig. 155View FIGURES 155 – 160) of the only known species of this genus. Gender: feminine.

Included species

* Ceratocista antennata ( Ansari, 1956a: 139)  n. comb. [in Brueelia  ]












Ceratocista Gustafsson & Bush

Bush, Sarah E. 2017

Brueelia Kéler, 1936a : 257

Keler 1936: 257

Ceratocista antennata ( Ansari, 1956a: 139 )

Ansari 1956: 139