Olivinirmus Złotorzycka, 1964

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: 199-201

publication ID

https://doi.org/10.11646/zootaxa.4313.1.1

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http://treatment.plazi.org/id/832187E9-FF4C-FF0B-FF74-6090FCE7FAD1

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scientific name

Olivinirmus Złotorzycka, 1964
status

 

Olivinirmus Złotorzycka, 1964 

Nirmus Nitzsch, 1818: 291  (in partim).

Degeeriella Neumann, 1906: 60  (in partim). Brueelia Kéler, 1936a: 257  (in partim). Olivinirmus Złotorzycka, 1964a: 246  .

Type species. Nirmus glandarii Denny, 1842: 51  , by original designation.

Diagnosis. The male genitalia of Olivinirmus  are variable ( Figs 334–337View FIGURES 334 – 337), but superficially similar to those of Corvonirmus  ( Figs 323–325View FIGURES 321 – 326), and these two genera are similar in the setal and structural head characters ( Figs 321View FIGURES 321 – 326, 329). In both genera parameres ( Figs 325View FIGURES 321 – 326, 332) are long and tapering, connected to a rectangular parameral head by a distinct neck; however, the parameral neck is absent in some Olivinirmus  , particularly the semiannulatus  species group ( Fig. 337View FIGURES 334 – 337) and the meinertzhageni  species group ( Fig. 335View FIGURES 334 – 337). The gonopore is highly modified in both genera, and there are distinct, often large, rugose areas on the ventral surface of the mesosome in both Olivinirmus  ( Figs 334–337View FIGURES 334 – 337) and Corvonirmus  ( Fig. 324View FIGURES 321 – 326). However, the ventral sclerite found in Corvonirmus  ( Fig. 324View FIGURES 321 – 326) is absent in Olivinirmus  ( Figs 334–337View FIGURES 334 – 337), and the ventral surface of the mesosome is generally simpler in Corvonirmus  than in Olivinirmus  . The gonopore is subterminal or terminal in Corvonirmus  , but ventral in Olivinirmus  , and while the exact structure of the gonopore varies between the four species groups of Olivinirmus  , no pmes are ever situated on the surface of the gonopore in this genus, whereas this is the case in Corvonirmus  ( Fig. 324View FIGURES 321 – 326). In female Olivinirmus  (Fig. 333) the subgenital plate does not flare into a cross-piece or lateral submarginal extensions as in Corvonirmus  ( Fig. 326View FIGURES 321 – 326), and the abdominal chaetotaxy of the two genera is dissimilar ( Table 2), with psps present on male tergopleurites II –III and female tergopleurite III in Corvonirmus  ( Fig. 320View FIGURES 319 – 320), but absent on tergopleurites II –III in both sexes in Olivinirmus  ( Figs 327–328View FIGURES 327 – 328). In all Corvonirmus  asseccory sts are present on at least some segments, but this is never the case in Olivinirmus  .

Description. Both sexes. Head convex- to indented-dome shaped (Fig. 329). Marginal carina uninterrupted, displaced dorsally and posteriorly at osculum. Pale dot visible in many species at dsms where marginal carina is narrowed. Dorsal preantennal suture absent. Ventral carinae sometimes continuous with marginal carina, but often diffuse anterior to pulvinus. Ventral anterior plate absent. Head setae as in Figs 329; as3 absent. Coni small, triangular. Antennae monomorphic except in the meinertzhageni  and semiannulatus  species groups. Temporal carinae not visible; mts  3 only macrosetae. Gular plates triangular to spade-shaped.

Prothorax ( Figs 327–328View FIGURES 327 – 328) rectangular. ppss on postero-lateral corner. Proepimera hook-shaped medianly, curving around coxae II. Pterothorax pentagonal; lateral margins widely divergent; posterior margin convergent to median point; mms narrowly separated medianly. Meso- and metasterna not fused; 1 seta on postero-lateral corner on each side of each plate. Metepisterna widen medianly to blunt ends. Metepimeron often broad, swollen. Leg chaetotaxy as in Fig. 25View FIGURES 25, except fI-p2 absent.

Abdomen ( Figs 327–328View FIGURES 327 – 328) oval. Abdominal chaetotaxy differing slightly between species groups ( Table 9). Tergopleurites rectangular; tergopleurites II –IX+X in males and tergopleurites II –VIII in females moderately divided medianly. Tergopleurites generally translucent or weakly pigmented median to spiracle openings, and in some species median margins are hard to see. Sternal plates rectangular, not approaching pleurites; generally weakly pigmented and may be hard to see. Tergopleural plates reach to ventral side of abdomen. Pleural incrassations moderate to wide. Re-entrant heads moderate. Male subgenital plate triangular, extremely narrow at terminal end of abdomen. Female subgenital plate triangular, but in many species diffuse distally, and in some species it cannot be determined whether it reaches the vulval margin or not. Vulval margin (Figs 333) with few, long, slender vms, several thorn-like vss; vos follows lateral margins of subgenital plate; distal vos approaching or situated median to vss.

Species Sex ps aps  psps tps  ss sts

Ol. glandarii  M IV –VIII IV –VII IV –VIII – II –VIII II –VI F IV –VIII – IV –VII – II –VIII II –VI Ol. meinertzhageni  M IV –VIII IV –VIII IV –VIII VI –VIII II –VIII II –VI F IV –VIII – IV –VIII – II –VIII II –VI Ol. nitzschi  M IV –VIII IV –VII IV –VIII – II –VIII II –VI F IV –VIII – IV –VIII – II –VIII II –VI Ol. semiannulatus  M IV –VIII IV –VIII III –VIII VIII II –VIII II –VI F IV –VIII – IV –VIII – II –VIII II –VI Male genitalia ( Figs 334–337View FIGURES 334 – 337) variable between species-groups (see below). Basal apodeme roughly rectangular, but may be constricted at mid-length ( Fig. 334View FIGURES 334 – 337) or widening slightly anteriorly ( Fig. 335View FIGURES 334 – 337). Proximal mesosome of varying shape. Gonopore (Fig. 331) open distally. Most species-groups with subparallel, flameshaped thickenings on ventral side extending into the extrusor muscles. Mesosomal lobes large, fused distally; 0–2 ames anterior to gonopore; 0–3 pmes posterior to gonopore, often 2 pmes laterally and 1 pmes just distal to gonopore. In some species both ames and pmes may be hidden in the ventral structures of the mesosome. Rugose nodi present in some species-groups. Parameral heads (Fig. 332) folded medianly, rectangular to triangular. Parameral blades elongated, tapering; pst1 sensillus, central; pst2 sensilla or microseta, central; pst1– 2 may be relatively close ( Fig. 336View FIGURES 334 – 337) or much separated ( Fig. 337View FIGURES 334 – 337).

Species-group characters. All species-groups in Olivinirmus  are based primarily on the male genitalia, which are illustrated in Figs 334–337View FIGURES 334 – 337. The phylogeny of Bush et al. (2016) did not include members of all of these groups, and the true relationships between these species-groups are unknown. Species not examined by us have been placed in species gropus based on illustrations provided with their original descriptions.

Olivinirmus glandarii  species-group. Antennae monomorphic. Abdominal chaetotaxy as in Table 9; tps  absent; psps absent on male tergopleurite III ( Fig. 327View FIGURES 327 – 328). Females with or without psps on tergopleurite VIII ( Fig. 328View FIGURES 327 – 328). Proximal mesosome rounded trapezoidal (Fig. 331). Mesosomal lobes not fused distally, with prominent nodi submedianly. Gonopore open distally and associated with subparallel ventral thickenings; 2 ames on each side antero-lateral to gonopore; 2 pmes on each side on lateral margin, often hard to see; 1–2 pmes on each side posterolateral to gonopore, often not visible due to rugose nodi. Rugose nodi may be present on distal mesosome. Parameral heads (Fig. 332) quadratic to rectangular; pst2 sensillus, far distal to pst1.

Olivinirmus meinertzhageni  species-group. Antennae dimorphic. Abdominal chaetotaxy as in Table 9; tps  present on male tergopleurites VI –VIII; psps absent on male tergopleurite III. Females without psps on tergopleurite VIII. Proximal mesosome slender ( Fig. 335View FIGURES 334 – 337). Mesosomal lobes fused distally, with prominent marginal thickening. Ventral surface of mesosome densely papillate proximal to gonopore. Gonopore widely open distally, and shaped as trapezoidal plate with serrated lateral margins in distal half; 2 ames on each side near anterolateral corners of gonopore; 1 pmes on each side postero-lateral to gonopore; 2 pmes on each side on lateral margins. Rugose nodi absent. Parameral heads oblique; pst2 sensillus, close to pst1.

Olivinirmus morionus  species-group. Antennae monomorphic. Abdominal chaetotaxy as in Table 9; tps  absent; psps absent on male tergopleurite III. Females with psps on tergopleurite VIII. Proximal mesosome slenderly trapezoidal, rounded ( Fig. 336View FIGURES 334 – 337). Mesosomal lobes slender, triangular, fused distally, and with prominent nodi on lateral and distal corners. Gonopore widely open distally, and extended laterally into serrated or fringed areas. Parameral heads rounded quadratic; pst2 microseta, close to pst1.

Olivinirmus semiannulatus  species-group. Antennae dimorphic. Abdominal chaetotaxy as in Table 9; tps  present on male tergopleurite VIII; psps present on male tergopleurite III. Females with psps on tergopleurite VIII. Proximal mesosome widely rounded ( Fig. 337View FIGURES 334 – 337). Mesosomal lobes large, rounded, fused distally, with extensive rugose nodi in distal half. Gonopore widely open distally. Parameral heads quadratic, but with concave median margins and serrated distal margins; pst2 microseta, far distal from pst1.

Host distribution. Most species occur on members of the Corvidae  , but not on the genus Corvus  . No comprehensive phylogeny of the Corvidae  is known to us, but based on the phylogeny of Ericson et al. (2005) the distribution of Olivinirmus  on corvid hosts appears to be discontinuous. Outside the Corvidae  , Olivinirmus  is only know from the Cracticidae  , where it occurs on all genera, and possibly all species.

Geographical range. Almost global, not known from Africa south of the Sahara. Corvid hosts not belonging to Corvus  from this area are parasitised by species of Brueelia  s. str.

Remarks. In the phylogeny of Bush et al. (2016), Olivinirmus  was placed as a sister group to Sturnidoecus  with high support, but few morphological similarities exist between these two genera. The “head louse” ecomorph has evolved independently several times within the Brueelia  -complex, and the evolution of the head louse morphology in Sturnidoecus  may have obscured similarities between the ancestors of these two genera. Alternatively, the placement of Olivinirmus  as sister to Sturnidoecus  is marginally nonsignificant (0.93 Bayesian Posterior Probability) and the data set in Bush et al. (2016) may not be sufficient to indicate the true sister relationship between these two genera.

Both Toon & Hughes (2008) and Bush et al. (2016) found considerable geographical structure in Olivinirmus  from Australian cractids. Interestingly, Bush et al. ’s (2016) study showed that several host species in the same geographic region were parasitised by the same lineage of Olivinirmus  . The collection of fresh, sequenceable, material from more host species and more geographic regions is needed to understand the diversity and host specificity within Olivinirmus  .

Included species

Olivinirmus glandarii  species-group

* Olivinirmus glandarii ( Denny, 1842: 51)  [in Nirmus  ] Nirmus affinis Nitzsch  [in Giebel], 1874: 132 nec Nirmus affinis Children, 1836  [1]

* Olivinirmus husaini ( Ansari, 1956b: 383)  n. comb. [in Brueelia  ]

* Olivinirmus olivaceus ( Burmeister, 1838: 431)  [in Nirmus  ]

* Olivinirmus perisoreus ( Ansari, 1956b: 374)  [in Brueelia  ]

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Phthiraptera

Family

Philopteridae

Loc

Olivinirmus Złotorzycka, 1964

Bush, Sarah E. 2017
2017
Loc

Olivinirmus glandarii (

Giebel 1874: 132
Denny 1842: 51
1874
Loc

Nirmus

Nitzsch 1818: 291
Loc

Degeeriella

Zlotorzycka 1964: 246
Keler 1936: 257
Neumann 1906: 60
Loc

Olivinirmus husaini ( Ansari, 1956b: 383 )

Ansari 1956: 383
Loc

Olivinirmus olivaceus (

Burmeister 1838: 431
Loc

Olivinirmus perisoreus (

Ansari 1956: 374