Allorhogas mendocinus (Kieffer and Jörgensen) Martinez & Zaldivar-Riverón & Sáez, 2008

Martinez, Juan J., Zaldivar-Riverón, Alejandro & Sáez, Alberto G., 2008, Reclassification of Bracon mendocinus, a gall-associated doryctine wasp, and description of a new closely related species of Allorhogas (Hymenoptera: Braconidae), Journal of Natural History 42 (41 - 42), pp. 2689-2701 : 2693-2697

publication ID	https://doi.org/ 10.1080/00222930802354134
persistent identifier	https://treatment.plazi.org/id/03A72007-1E6E-FFB2-FEA9-4FE2FDE2FD19
treatment provided by	Felipe
scientific name	Allorhogas mendocinus (Kieffer and Jörgensen)
status	comb. nov.

Treatment

Allorhogas mendocinus (Kieffer and Jörgensen) comb. nov.

( Figures 2A,C,E View Figure 2 , 3A,E View Figure 3 , 4A,B View Figure 4 )

Bracon mendocinus Kieffer and Jörgensen 1910, p. 414 View in CoL

Diagnosis

Allorhogas mendocinus can be distinguished from all other species of Allorhogas except A. joergenseni sp. nov. by the rugose head and mesoscutum and the obscured or weak notauli. Following Marsh’s key to species of Costa Rica ( Marsh 2002), the latter two species may be more related to A. rugosus Marsh , which has rugulose mesonotal lobes at least along the notauli, although in the species treated here the sculpture is much coarser. Additionally, A. rugosus has bigger eyes (maximum diameter about three times the length of the malar space), honey brown in colour, and with inner orbits emarginated near the toruli. Allorhogas mendocinus is distinguished from A. joergenseni sp. nov. by its different metasomal sculpture. In A. mendocinus , the metasomal terga beyond tergum III are entirely coriaceous, whereas in A. joergenseni these are striate basally and weakly punctate to smooth apically. In addition, frons excavation is not as conspicuous in A. mendocinus as in A. joergenseni .

Female

Body length 2.6 mm, forewing 1.9 mm.

Colour. Head and mesosoma orange-red, apex of antenna and metasoma beyond tergum I black, telotarsi darkened, forewing hyaline basally and very weakly infuscate beyond vein M; veins brown, except veins C+SC+R, M+CU and 1-1A which are light brown to yellow; pterostigma brown, hindwing entirely hyaline.

Head. Transverse, about twice as wide as long, 18 antennomeres; occipital carina present and complete, reaching hypostomal carina; face, vertex and temples coarsely rugose ( Figure 2A View Figure 2 ), except for an almost smooth narrow median line from clypeus to toruli; frons weakly excavated ( Figure 2C View Figure 2 ); oral cavity small, shorter than malar space; eye moderate sized, 1.5 to 2 times the length of the malar space, with inner orbits uniformly rounded; temples narrow, shorter than eye width.

Mesosoma. Relatively short and compact, 1.5 to 1.7 times longer than high and about as high as wide. Pronotum rugose, pronotal collar not distinct, pronotal furrow rugose. Mesoscutum ( Figure 2E View Figure 2 ) transverse in dorsal view and strongly declivous anteriorly, 0.6 to 0.7 times as long as wide, anterior edge strongly directed anteriorly, apical face forming an acute angle with dorsal face in lateral view; coarsely rugose; notauli completely obscured by sculpture. Scutellum weakly acinose. Propodeum ( Figure 3A View Figure 3 ) rugose–areolate, declivous posteriorly, without distinct carina or areola, with two somewhat more evident divergent carinae directed posteriorly and laterally from the median anterior edge. Mesopleuron rugose to acinose, subalar groove rugose, sternaulus half as long as mesopleuron.

Legs. Foretibia with a row of seven spines along the anterior margin, hind coxa mostly rugose with a small but distinct basal tubercule.

Wings. Forewing ( Figure 4A View Figure 4 ) with pterostigma short and broad, second submarginal cell closed at apex; first subdiscal cell open apically; r shorter than 3RS; 2cu-a absent; RS+Ma sinuate; RS+Mb very short. Hindwing ( Figure 4B View Figure 4 ) with vein m-cu nebulous and weakly curved towards wing apex.

Metasoma. Tergum I always wider than long, striate, anterior area clearly delimited by carinae and punctate; raised median area not clearly defined by carinae, basal sternal plate one-quarter to one-third the length of tergum I. Terga II and III striate, fused, line separating second and third terga weakly indicated laterally; remainder of terga entirely coriaceous ( Figure 3E View Figure 3 ); ovipositor sheaths 0.25 times as long as metasoma.

Male

Essentially as in female, with 23 to 24 antenommeres.

Material examined

Argentina: Neotype female ( MACN, here designated), La Pampa, Parque Luro , 22 February 2003, Martinez coll. Additional specimens: two males ( MACN), La Pampa, Santa Rosa 20 March 2006, reared from galls of L. chilense, Martinez coll .

Biological observations

The new specimens assigned to A. mendocinus were reared from bud galls of L. chilense var. chilense ( Figure 5B View Figure 5 ). These galls are identical to those described and illustrated by Jörgensen (1917) from the same plant species ( Figure 5A View Figure 5 ). Although the last author mentioned the name L. gracile , this is a junior synonym of L. chilense var. glaberrimum . Galls on this plant species are oval, approximately 1 cm long, with a stiliform process that is about as long as the gall, and pubescent and green when fresh but brownish and almost glabrous when dry. The tissue surrounding the single pupal chamber is spongy in both mature and dry galls. As mentioned by Jörgensen (1917), galls are common during summer and it is possible that A. mendocinus produces more than one generation per year. Unlike the other gall-associated doryctines in the same locality ( Percnobracon cf. stenopterus ), which spend winter as mature larvae within galls and the adults emerge in spring, adults of A. mendocinus emerge in late summer or early autumn.

In their study of gall insects from Argentina, Kieffer and Jörgensen (1910) proposed the name Oligotrophus (?) lyciicola for a hypothetic gall-inducing cecidomyiid ( Diptera ) species that could not be reared or observed within the galls, but that was assumed to be the host of A. mendocinus and other parasitic Hymenoptera . During the surveys made for this study, no adult cecidomyiid flies were reared from galls of L. chilense and no cecidomyiid larvae or pupae remains were observed within the pupal chambers. This, together with the current knowledge of gall induction by other species of Allorhogas , strongly suggests that A. mendocinus actually is the species that induces the galls on L. chilense . However, the absence of remains of the host after parasitoid emergence is known to occur in various parasitic species, and therefore further observations are needed to confirm the existence of the above cecidomyiid species.