Eurytoma ithma, 2014

Delvare, Gérard, Gebiola, Marco, Zeiri, Asma & Garonna, A. P., 2014, Revision and phylogeny of the European species of the Eurytoma morio species group (Hymenoptera: Eurytomidae), parasitoids of bark and wood boring beetles, Zoological Journal of the Linnean Society 171 (2), pp. 370-421 : 394-397

EURYTOMA ITHMA DELVARE SP. NOV.

( FIG. 18A–L )

Type material

Holotype ♀. France: Ardèche, Loubaresse, Forêt Domaniale de Prataubérat , Piste forestière des Rialles , 1160 m a.s.l., 44°35′12″N, 04°03′55″E, on a dead branch of Pinus sylvestris , 17.vii.2012 (G. Delvare) ( GDEL1351 . EUR111 ) (in MHNG) . Paratypes. Same data (1 ♀, in MNHN) ( GDEL1351 . EUR112 ) ; same data, but 24.vii.2012 (3 ♀, in MNHN) ( GDEL1351 . EUR113 , GDEL1351 . EUR114 , GDEL1351 . EUR115 ) ; Alpes- Maritimes, Belvédère, Castellarou , point 263, 1500 m a.s.l., 44°01′53″N, 07°21′32″E, on dead trunk of Pinus sylvestris , 31.vii.2009 (G. Delvare) (1 ♀, 1 ♂; in GDPC) (respectively, GDEL1300 . EUR30 and GDEL1301 . EUR31 ) ; Haute-Garonne, Castelmaurou , Malaise trap, 43°41′01″N, 01°32′06″E, 01/ 21.viii.1995 (M. Tussac) (1 ♀, in GDPC) ; Hérault, Saint-Pierre-de- Lafage, Forêt Domaniale de Parlatges , 650 m a.s.l., 47°48′61″N, 03°21′06″E, on dead trunk of Pinus nigra , 14.vii.2004, (G. Delvare) (1 ♀, in GDPC) . Italy: Friuli Venezia Giulia, Giulia, Pontebba , Gamiscen , 728 m a.s.l., 46°28′04″N, 13°39′49″E, on logs, 16.vii.2008 (G. Delvare) (1 ♀, in GDPC) ( GDEL1319 . EUR32 ) .

Diagnosis

Lower face entirely strigose, the radiating crests reaching eyes and antennal toruli. Anterior outline of mesepisternum with blunt angle in front of mesocoxae, delimiting anteriorly an apparent ventral shelf when seen in lateral view. Metacoxa bare dorsally at base. Setation of lower surface of costal cell as usual, not especially dense. Marginal vein not or slightly thickened, 4.0–5.0 times as long as wide. Gaster distinctly longer than mesosoma and laterally compressed, with syntergum slightly longer than GT6 on dorsal median line. Ovipositor ascending.

Description

Female, body length 3.15 mm. Body, coxae, and teeth of mandibles black. Rest of mandibles, tegula, pedicel, and flagellum dark brown. Femora black, except apices and a reddish longitudinal ventral stripe on pro- and mesofemora. Rest of legs reddish testaceous except meso- and metatibia partly infuscate, but always with a reddish longitudinal ventral stripe. Scape reddish with small apicodorsal dark spot. Ovipositor black with very small apical light spot. Veins brown, setation of wings dark.

Head transverse in dorsal view 1.91 times as wide as long. Anterior outline of frons not very convex. Vertex punctured. OOL as large as lateral ocelli diameter. POL more than twice as large as median ocelli diameter. Front outline of frons not very convex. Temples short, merging to occiput without angle. Genae with broad, finely coriaceous stripe behind malar sulcus, their lateral outline convex in frontal view. Clypeus depressed, not emarginate on ventral margin. Setation of lower face and frons relatively sparse and thin. Length of malar space 0.71 times width of oral fossa and 0.70 times height of eyes. Eyes separated by 1.48 times their own height. Antennal scrobes as long as distance between toruli and lower margin of clypeus.

Antenna. Scape linear. All funicular segments clearly longer than wide, slightly decreasing in length and bearing numerous MPS. Clava narrowly rounded at apex.

Mesosoma 1.77 times as long as wide. Setation short, appressed, and thin, mainly reclinate. Puncturation dense and regular on pro- and mesonotum, with narrow interspaces. Pronotum 0.74 times length of mesoscutum. Pronotal collar hardly longer than lateral lobes on shoulders. Notauli broadly impressed but obliterated by the sculpture of the mesoscutum. Scutellum 1.19 times as long as broad. Propodeum broadly depressed ventrally, without median channel, the depressed surface areolate rugose. Lateral prepectus separated from sublateral by faint ridge, its bottom rugulose reticulate. Adscrobal carina of mesepisternum clearly visible, joining epicnemium at some distance from mesotrochantinal plate and turning ventrally to mesofurcal pit.

Appendices. Metafemur 4.15 times as long as broad, metatibia 6.75 times as long as broad. Hind tarsus 0.83 times as long as hind tibia. Costal cell 0.45 times as long as forewing. Marginal vein 1.88 times as long as stigmal vein and 1.70 times as postmarginal.

Metasoma. Petiole short with sharp, conical anteromedian tooth. Gaster 1.21 times as long as mesosoma, 1.89 times as long as height of third gastral tergite.

Etymology

The epithet ithma is a Greek substantive for ‘step’, referring to the elbowed outline of the mesepisternum.

Recognition

Within the morio group this species is easily recognized by the sharp adscrobal carina at same distance from mesotrochantinal plate ventrally. This character is shared with the female paratype and male allotype of E. kangasi . The two species are extremely close. Females are separated by the length of the gaster, notably longer in the female paratype of E. kangasi , with a longer syntergum. Males can be separated by the antenna. The male allotype of E. kangasi is black dorsally and has shorter and more strongly nodiform funicular segments.

Hosts

All specimens were collected on dying pines – Pinus sylvestris and Pinus nigra – infested by bark beetles.

Distribution

The species is known from the Italian Julian Alps, Alpes Maritimes in south-eastern France and the southern border of the Massif Central (Causse du Larzac and Cévennes), from 650 to 1500 m a.s.l. elevation (see Fig. S 10 in Appendix S8).

EURYTOMA KANGASI HEDQVIST, 1966

( FIG. 19A–F )

Eurytoma kangasi Hedqvist, 1966: 194 . Original description. Finland.

Associated tree: aspen. Possible hosts:

Cacotemnus (= Anobium ) rufipes (Fabricius, 1792) ( Anobiidae ); Ptilinus fuscus Geoffroy in Fourcroy, 1785 ( Anobiidae ); and Pelecotoma fennica (Paykull, 1799) (Ripiphoridae) .

Eurytoma kangasi Hedqvist : Zerova, 1995: 155; Zerova, 2010: 62. Inclusion in rosae species group.

Material examined

Holotype ♀ (in FMNH). For labelling, see Figure 9F .

Remarks

The type series of E. kangasi actually includes two species. The species is interpreted here according to the holotype, clearly designated by Hedqvist.

Diagnosis

The species is very close to E. arctica . The diagnosis refers to this species. Scape entirely black. Head globose in dorsal view, 1.77 times as wide as long, the outline of frons strongly convex. Vertex with coriaceous transverse stripe between lateral ocelli. Outline of genae convex when seen in frontal view. Lower face sparsely setose. Notauli broad, crenulate. Median channel of propodeum hardly distinct.

Host. The holotype does not bear any host information; therefore, the true host is unknown, and hence the hosts quoted in the original description might be erroneous.

Distribution

The species is known only from the female holotype collected in Finland and a few specimens quoted from Russia by Zerova (1995) (see Fig. S 10 in Appendix S8).

Figures

Figure 9. A–I, labelling of some types. A, lectotype ♀ of Eurytoma arctica Thomson, 1875; B, lectotype ♀ of Eurytoma umbilicata Thomson, 1876; C, holotype ♀ of Eurytoma blastophagi Hedqvist, 1963; D, holotype ♀ of Eurytoma fraxinicola Hedqvist, 1963; E, paratype ♀ of Eurytoma annilai Hedqvist, 1974; F, holotype ♀ of Eurytoma kangasi Hedqvist, 1966; G, paratype ♀ of Eurytoma kangasi Hedqvist, 1966; H, allotype ♂ of Eurytoma kangasi Hedqvist, 1966; I, holotype ♀ of Eurytoma kemalpasensis Narendran, Tezcan & Civelek, 1995.

Figure 10. A–D, Eurytoma afra: A–C, female; D, male. A, head in frontal view; B, head and pronotum in lateral view; C, head and mesosoma in dorsal view; D, antenna.

Figure 18. A–L, Eurytoma ithma sp. nov. (paratypes): A–K, female; L, male. A, head in frontal view; B, head in dorsal view; C, head in lateral view; D, head in ventral view; E, antenna; F, mesosoma in dorsal view; G, mesopleuron; H, propodeum; I, forewing; H, propodeum; J, apical venation; K, gaster in lateral view; L, antenna.

Figure 19. A–F, Eurytoma kangasi (holotype ♀): A, head in dorsal view; B, vertex; C, antenna; D, mesopleuron; E, propodeum; F, gaster in lateral view.