Introduction

Materials and methods

Taxon treatment

Mesopolobus askewi Todorov, sp. nov.

• ZooBank 03A61CA1-AFCF-49E5-9CA2-F2DE94DAAEA3

Materials   Download as CSV 

Holotype:

1. scientificName:
   Mesopolobus askewi
   ; country:
   Bulgaria
   ; locality:
   Western Rhodope Mts, near Pamporovo
   ; verbatimElevation:
   1580 m
   ; locationRemarks:
   coniferous forest
   ; decimalLatitude:
   41.62250
   ; decimalLongitude:
   24.70100
   ; eventDate:
   23.VIII.2018
   ; sex:
   female
   ; recordedBy:
   Ivaylo Todorov leg.
   ; occurrenceID:
   DEF0892C-3067-52BB-8ACD-B3D528106BA5

Paratypes:

1. scientificName:
   Mesopolobus askewi
   ; country:
   Bulgaria
   ; locality:
   Western Rhodope Mts, near Pamporovo
   ; verbatimElevation:
   1580 m
   ; locationRemarks:
   coniferous forest
   ; decimalLatitude:
   41.62250
   ; decimalLongitude:
   24.70100
   ; eventDate:
   23.VIII.2018
   ; sex:
   4 females
   ; preparations:
   whole specimens, mounted on card points
   ; recordedBy:
   Ivaylo Todorov leg.
   ; occurrenceID:
   96752C8D-DA46-5DEE-BB45-62EB4C77E46F
2. scientificName:
   Mesopolobus askewi
   ; country:
   Bulgaria
   ; locality:
   Western Rhodope Mts, near Pamporovo
   ; verbatimElevation:
   1580 m
   ; locationRemarks:
   coniferous forest
   ; decimalLatitude:
   41.62250
   ; decimalLongitude:
   24.70100
   ; eventDate:
   23.VIII.2018
   ; sex:
   1 female
   ; preparations:
   dissected for SEM observation
   ; recordedBy:
   Ivaylo Todorov leg.
   ; occurrenceID:
   3FBD0FDC-4838-56E2-AC29-B1A1BF174D41

Other materials:

1. scientificName:
   Mesopolobus askewi
   ; country:
   Bulgaria
   ; locality:
   Western Rhodope Mts, near Pamporovo
   ; verbatimElevation:
   1580 m
   ; locationRemarks:
   coniferous forest
   ; decimalLatitude:
   41.62250
   ; decimalLongitude:
   24.70100
   ; eventDate:
   23.VIII.2018
   ; sex:
   4 females
   ; recordedBy:
   Ivaylo Todorov leg.
   ; occurrenceID:
   1E4CECB3-0046-590B-92AC-30D06C8F118D
2. scientificName:
   Mesopolobus askewi
   ; country:
   Bulgaria
   ; locality:
   Western Rhodope Mts, near Perelik hut
   ; verbatimElevation:
   2000 m
   ; locationRemarks:
   coniferous forest
   ; decimalLatitude:
   41.60518
   ; decimalLongitude:
   24.59265
   ; eventDate:
   20.VIII.2021
   ; sex:
   3 females
   ; recordedBy:
   Ivaylo Todorov leg.
   ; occurrenceID:
   71B4F34A-C08E-59EB-98CE-AC9F046897E1
3. scientificName:
   Mesopolobus askewi
   ; country:
   Bulgaria
   ; locality:
   Stara Planina: Shipchenska Mts, near Uzana hut
   ; verbatimElevation:
   1243 m
   ; locationRemarks:
   coniferous forest
   ; decimalLatitude:
   42.75800
   ; decimalLongitude:
   25.23427
   ; eventDate:
   08.VII.2020
   ; sex:
   5 females
   ; recordedBy:
   Ivaylo Todorov leg.
   ; occurrenceID:
   475AD205-C6E7-559E-A34C-68C080FB62BE
4. scientificName:
   Mesopolobus askewi
   ; country:
   Bulgaria
   ; locality:
   Stara Planina: Troyanska Mts, near Beklemeto
   ; verbatimElevation:
   1433 m
   ; locationRemarks:
   coniferous forest
   ; decimalLatitude:
   42.78280
   ; decimalLongitude:
   24.62160
   ; eventDate:
   17.VIII.2021
   ; sex:
   1 female
   ; recordedBy:
   Ivaylo Todorov leg.
   ; occurrenceID:
   D878612E-EB2A-5481-8761-39CD48AF17E5

Description

Length: 1.7–2.1 mm.

Colouration (Fig. 1a). Head blue to bluish-green. Mesosoma bluish-green dorsally, pro-, meso- and metapleuron, as well the lateral panels of pronotum, green with coppery reflections; propodeum bluish-green, shiny; gaster brownish, with bluish-green metallic tints dorsally. Antenna with scape, pedicel and anelli fulvous, funicular segments yellowish beneath, dorsally pale testaceous with weakly infuscate proximal half. Mandibles and palps pale yellow, mandibular teeth brown. Coxae dorsally coloured as mesosomal pleura, ventral surface light brownish. Legs with femora and protibiae fulvous, meso- and metatibiae mostly fulvous with distal one-fifth yellowish; protasi fully yellowish with only tarsal claws fuscous, meso- and metatarsal segments 1-4 yellowish, 5^th segments fuscous. Wings clear, venation pale testaceous.

a

b

c

d

e

f

Figure 1.

Mesopolobus askewi sp. nov. Stereomicroscopic images:

a: Holotype habitus, lateral view;  
b: Holotype, dorsal view;  
c: Holotype head and mesosoma, lateral view;  
d: Paratype claval strip of micropilosity (indicated with black lines and an arrow);  
e: Holotype upper mesepimeron (pointed with an arrow);  
f: Paratype fore wing.  

Tegument. Head with upper face and vertex reticulate; lower face and genae reticulate to strigulate-reticulate; clypeus striate, striation not extending beyond sclerite margins; supraclypeal area reticulate; antennal scape and pedicel imbricate; Mesosoma: Pronotal collar and mesonotum reticulate, metanotum with lateral panels and dorsellum smooth and shiny; propodeum with median area between plicae weakly sculptured, shiny, median carina complete; propodeal plicae complete, sharp anteriorly and posteriorly, more rounded in the anterior third (Fig. 2f); nuchal strip short and smooth; upper mesepimeron faintly, but visibly reticulate (Fig. 1e), lower mesepimeron and mesepisternum moderately finely reticulate; Gaster: Tergite 1 smooth and shiny, second and third tergites in proximal 1/4^th, fourth tergite in proximal half – with very shallow alutaceous sculpture, tergites 5-7 finely alutaceous on entire surface; all sternites finely alutaceous.

a

b

c

d

e

f

Figure 2.

Mesopolobus askewi sp.nov. SEM-micrographs:

a: Head, facial view;  
b: Clypeus;  
c: Antenna, lateral view;  
d: Antennal basiconic capitate pegs (pointed with white arrows);  
e: Mesosoma, dorsal view;  
f: Propodeum.  

Head. 1.11-1.16x breadth of mesosoma, in dorsal view 1.94-2.0x as broad as long, temples 0.24-0.27x the length of eye (Fig. 1b), head in facial view 1.17-1.24x as broad as high; POL 2.0-2.5x OOL, OOL 1.5-2.0x diameter of ocelli; compound eyes with scattered, very short setae (Fig. 2a); lower edge of antennal toruli at the level or even slightly below lower ocular line, 2.2-2.7x closer to clypeal margin than to median ocellus; clypeus moderately emarginated (Fig. 2b); malar space 0.43-0.55x eye height; width of oral fossa 2-2.13x malar space. Scape 0.8-0.9x height of eye, extending far below median ocellus (Fig. 1c); pedicel plus flagellum 0.9x breadth of head; pedicel 1.6-2.0x as long as the first funicular segment; antenna with 3 anelli, first anellus strongly transverse, second and third anellus nearly equal in length, less transverse and about 2x longer than the first (Figs 1c, 2c); funicular segments 1-3 or 1-4 hardly to slightly longer than broad, 4^th to 5^th subquadrate to quadrate; flagellum subclavate, clava in lateral view 1.6-2.0x as broad as first funicular segment, with narrow strip of micropilosity on the ventral surface of third segment (Fig. 1d); placoid sensilla in one row on each segment (Fig. 2c); funicular segments with scattered, but well visible basiconic capitate pegs (Fig. 2d).

Mesosoma. 1.52-1.58x as long as broad; pronotal collar long medially, about 1/6 to 1/5 (0.17 to 0.2x) length of mesoscutum (Figs 1b, 2e), not carinate anteriorly, with only slightly raised front margin, sloping vertically to dorsal plane of mesoscutum (Fig. 1c), pronotal neck not visible in dorsal view (Fig. 2e); mesoscutum 1.46-1.55x broader than long, 1.17-1.2x as long as scutellum; Propodeum (Fig. 2f) medially less than half (0.35-0.45x) as long as scutellum; median area between plicae 1.80-2.14x broader than long; spiracles ellipsoid in shape, separated by their minor diameter from the hind margin of metanotum; callus setose, with 15-20 setae. Legs rather stout, hind femora 3.4-4.0x as long as broad.

Fore wing. Marginal vein 1.10-1.23x as long as postmarginal vein and 1.60-1.75x as long as stigmal vein (Fig. 1f). Upper surface of costal cell bare; lower surface with one complete row of setae extending to humeral plate and with some setae scattered over distal third; basal vein with complete row of setae, basal cell bare or having at most one seta close to the basal vein; cubital setal line not developed; speculum open below, extending beyond 0.24-0.39x length of marginal vein; marginal setae presented on the entire apical margin; disc rather densely setose.

Gaster. 1.3-1.7x longer than wide, usually 0.72-0.92x shorter than, sometimes as long as head plus mesosoma; tip of hypopygium situated usually about at middle, rarely slightly before or slightly beyond the middle of gaster length; ovipositor sheaths well visible in ventral view, but hardly or not projecting beyond the last tergite.

Male. Unknown.

Diagnosis

Mesopolobus askewi sp. nov. belongs to the group of species that have three anelli, long pronotal collar, which is one-sixth to one-fifth the length of mesoscutum and gaster usually slightly shorter than head plus mesosoma. It runs to couplet 36 in Graham’s key (Graham 1969), but clearly differs from M. longicollis (Figs 3, 4) by a combination of characters presented in Table 1.

Table 1.

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Updated key to females of M. askewi sp. nov. and M. longicollis (characters in Bold are interpolated in the couplets designed by Graham (1969) to improve the key). Considering the original terms, we use thorax instead of mesosoma, but understand them as being equivalent.

36 (34)	Pronotal collar (Text-fig. 532) long, medially one-seventh to one-fifth as long as the mesoscutum, coarsely reticulate. Squat species with gaster usually slightly shorter than, rarely as long as, the combined length of head plus thorax, at least slightly less than twice as long as broad. Thorax golden green or bluish-green, head golden green to blue	37
-	Either the pronotal collar, medially, is at most one-eighth as long as the mesoscutum; or the gaster is about as long as head plus thorax and at least twice as long as broad and the head and thorax are bronze-green to bronze	38
37 (36)	Anterior margin of clypeus shallowly emarginated (Fig. 4a); POL 1.9-2.4x OOL; pronotal collar medially about 1/7 to 1/6 (0.14 to 0.17)x length of mesoscutum (Figs 3b, 4b); fore wing with basal vein bare or with 1-2 setae, basal cell bare; head and thorax green to bluish-green, sometimes with golden reflections; legs beyond coxae pale yellow (Fig. 3a); protarsi with fifth segment fuscous; venation pale yellow	M. longicollis
-	Anterior margin of clypeus moderately emarginated (Fig. 2b); POL 2.0-2.5x OOL; pronotal collar sometimes longer, medially about 1/6 to 1/5 (0.17 to 0.2)x length of mesoscutum (Figs 1b, 2e); fore wing having basal vein with complete row of setae, basal cell bare or sometimes with one seta close to the basal vein (Fig. 1f); head blue to bluish-green, thorax bluish-green to green with coppery reflections; legs beyond coxae mostly fulvous, only distal one-fifth of tibiae yellowish; protarsi with fifth segment yellowish, only tarsal claws fuscous; venation pale testaceous	M. askewi sp. nov.
38 (36)	= 37 (36) in the key of Graham (1969) etc.

a

b

Figure 3.

Mesopolobus longicollis, female. Stereomicroscopic images:

a: Habitus, lateral view;  
b: Dorsal view.  

a

b

Figure 4.

Mesopolobus longicollis. SEM-micrographs:

a: Female clypeus;  
b: Female mesosoma, dorsal view.  

Etymology

The first author is pleased to name this species after Dr. Richard Robinson Askew, one of the most prominent experts in the field of entomology, especially in the studies on Chalcidoidea. His works have been an inspiration for me since the beginning of my interest in the family Pteromalidae. In our correspondence Dr. Askew has always demonstrated his responsiveness and natural modesty and that have impressed me many times.

Biology

Unknown.

Analysis

Discussion

Acknowledgements

Author contributions

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