Pristomerus Curtis, 1836

Rousse, Pascal, Villemant, Claire & Seyrig, André, 2013, Ichneumonid wasps from Madagascar. VI. The genus Pristomerus (Hymenoptera: Ichneumonidae: Cremastinae), European Journal of Taxonomy 49, pp. 1-38: 4-7

publication ID

http://dx.doi.org/10.5852/ejt.2013.49

publication LSID

lsid:zoobank.org:pub:3710B2FF-ACC0-4D76-AC5A-F7A0B2D4BC63

DOI

http://doi.org/10.5281/zenodo.3815594

persistent identifier

http://treatment.plazi.org/id/EC22063E-626E-6236-87D8-424D9C0EFC5A

treatment provided by

Carolina

scientific name

Pristomerus Curtis, 1836
status

 

Genus Pristomerus Curtis, 1836   (definition after Townes 1971)

Diagnosis

Body moderately slender, metasoma moderately to strongly compressed. Occipital carina usually complete. Females (often) and males (nearly always) with hind femur swollen and bearing a tooth on lower side. Forewing with areolet open (3rs–m absent), vein Rs&M opposite or a little basal to vein cu–a, and 2rs–m basal to 2m–cu by at least 2rs–m length. Hindwing with vein Cu1 spectral. Tergite 1 moderately slender, glymma hardly distinct. Lower edges of tergite 1 separated and parallel. Epipleura of tergite 2 narrow, separated by a crease and turned under. Thyridium present, transverse or subcircular, located in basal 0.2 of tergite 2. Ovipositor tip most often sinuate. Apex of male gonosquama rounded.

Remarks

Pristomerus   is a large genus of 100 species worldwide ( Yu et al. 2012). Most species are tropical. Hosts include various small Lepidoptera   living in tunnels, leaf rolls, buds and other shelters. This genus is usually well differentiated from the New World genus Xiphosomella Szépligeti   by the position of the thyridiae on tergite 2, which in Pristomerus   are separated from the anterior margin by at most their own diameter, and most usually further back in Xiphosomella   . Additionally, the forewing areolet is always open and the ovipositor tip nearly always sinuate in Pristomerus   . As stated by Gauld (2000) this combination of features sometimes fails to unambiguously differentiate from Pristomerus   some species in the extreme end of the variation range of Xiphosomella   . Subsequently, both genera are susceptible to be eventually merged in absence of clearer autapomorphies.

Key to Pristomerus   species of Madagascar

1 Face and inner orbits dark brown, clypeus white ( Fig. 10C View Fig ); area superomedia hardly delimited laterally (male unknown) ....................................................................................... P. melissa   sp. nov.

– Face differently colored, white to orange, if medially dark then inner orbits strikingly paler; area superomedia almost always laterally delimited..................................................................2

2 Ground color of face white (e.g., Fig. 6 C View Fig ), sometimes with a more or less large dark mid- longitudinal marking (e.g., Figs 4 B View Fig , 13 B View Fig )........................................................................................3

– Ground color of face yellowish to orange (e.g., Figs 5 B View Fig , 16 B View Fig ).........................................................7

3 Metasomal tergites dark brown with wide white apical margin; female femoral tooth small but distinct (FFT = 1); male with lateral ocellus nearly contiguous with eye (OOL = 0.1) .............. ........................................................................................................................... P. guinness   sp. nov.

– Metasoma differently colored; female femoral tooth absent or hardly present as a weak angulation (FFT = 0); male with lateral ocellus more distant from eye (OOL> 0.1) (male of P. ranomafana   unknown).................................................................................................................4

4 Mesosoma elongate, more than 2 x as long as wide; ovipositor relatively short (OT <1.5); male with lateral ocellus relatively far from eye (OOL = 0.6) ........................ P. vahaza   sp. nov.

– Mesosoma at most 2 x as long as high; ovipositor longer (OT ≥ 1.5); male with lateral ocellus closer to eye (OOL = 0.2) (male of P. ranomafana   unknown)..................................5

5 Ovipositor very long (OT> 2.5), pterostigma orange ....................................... P. hansoni   sp. nov. – Ovipositor shorter (1.5 <OT <2.3), pterostigma brown...............................................................6

6 Forewing with 2rs–m at least 0.5 x as long as 2m–cu; ovipositor moderately long (OT 1.5–1.8) ..................................................................................................................................... P. caris Fitton  

– Forewing with 2rs–m shorter, about 0.3 x as long as 2m–cu; ovipositor longer (OT> 2) (male unknown) ........................................................................................................ P. ranomafana   sp. nov.

7 Female femoral tooth absent (FFT = 0); male with ocelli hardly enlarged, distant from eyes (OOL = 1.0)....................................................................................................................................................8

– Female femoral tooth present, though sometimes reduced to a small tubercle (FFT 1 or 2); male, where known, with ocelli enlarged and closer to eye (OOL <1).................................... 9 n. b. Males of P. albescens   could key here because their lateral ocelli are distinctly removed from eyes. They can however be distinguished by their transverse head with narrow clypeus ( CT = 1.4).

8 Antenna with more than 30 flagellomeres; mesosoma about 2 x as long as wide, body uniformly orange .................................................................................................................... P. kelikely   sp. nov.

– Antenna with fewer than 30 flagellomeres; mesosoma stouter, body with dark brown markings ......................................................................................................................... P. moramora   sp. nov.

9 Face at least with yellow margins along inner orbits; female femoral tooth small (FFT = 1) ...................................................................................................................................................10

– Face rufo-testaceous; female femoral tooth stronger (FFT = 2)...................................................14

10 Ovipositor relatively short (OT <1.4), its tip straight; head transverse with clypeus narrow ( CT <1.5) ............................................................................................................... P. albescens (Morley)  

– Ovipositor longer (OT 1.5–2.5), apically sinuate; head not distinctly transverse, clypeus more transverse ( CT > 1.5)........................................................................................................................11

11 Antenna with fewer than 25 flagellomeres; mesoscutum granulate with sparse punctures along notaulus; small species ( L <3.2) (male unknown) ................................................ P. keyka   sp. nov.

– Antenna with more than 25 flagellomeres; mesoscutum moderately to densely punctategranulate; larger species (L> 3.5).................................................................................................12

12 Antenna with more than 36 flagellomeres; pterostigma orange; propodeum with area superomedia hardly defined laterally; large species (L = 5.8) ..................................... P. patator   sp. nov.

– Antenna with fewer than 36 flagellomeres; pterostigma brown; propodeum with area superomedia complete; smaller species (L <5.5)....................................................................................13

13 Clypeus strongly transverse (CT> 2.5); malar line short (ML = 0.4), mesonotum orange ............... ................................................................................................................................ P. roberti   sp. nov.

– Clypeus narrower (CT <2), malar line longer (ML = 0.7), notaulus and scutellum yellow .............. ......................................................................................................................... P. cunctator Tosquinet  

14 Mesonotum densely punctate; face not distinctly transverse; large species (L> 7.0) ...................... ................................................................................................................................ P. veloma   sp. nov.

– Mesonotum almost smooth; head distinctly transverse with clypeus narrow (CT = 1.5); smaller species (L <5.0) ........................................................................................................... P. yago   sp. nov.

C

University of Copenhagen

B

Botanischer Garten und Botanisches Museum Berlin-Dahlem, Zentraleinrichtung der Freien Universitaet

P

Museum National d' Histoire Naturelle, Paris (MNHN) - Vascular Plants

CT

University of Cape Town

L

Nationaal Herbarium Nederland, Leiden University branch