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Essay on the Phylogeny of Braconidae (Hymenoptera: Ichneumonoidea)

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Essay on the Phylogeny of Braconidae (Hymenoptera: Ichneumonoidea) Essay on the phylogeny of Braconidae (Hymenoptera: Ichneumonoidea) C. VAN ACHTERBERG Achterberg, C. van.: Essay on the phylogeny of Braconidae (Hymenoptera: Ichneumo- noidea). [Studie <iver fylogenin hos parasitstekelfamiljen Braconidae.] - Ent. Tidskr. 105: 41-58. Uppsala, Sweden 1984. ISSN 0013-886x. A cladistic analysis is given of the higher classification of the Braconidae (Hymenoptera). The analysis is based on characters of both adult and larval morphology, as well as on their general biology. The Aphidiinae are considered to be a subfamily of the Braconidae not ilosely related to any of the other main groups of the subfamilies. Three groups are given subfamily rank in this paper: Dirrhopinae subfam. nov. (based on the Holarctic genus Dirrlu4te Foersler, 1862), Histeromerinae Fahringer (based on the Holarctic genus Flisrer- omzrrrs Wesmael, 1838), and Trachypetinae Schulz (based on the Australian genus lra- chtpetrrs Gudrilrt.lS3l). The Cenocoeliinae are separated from the Helconinae, a subfamily to which they are not closely related. The Blacinae (including 1)y.rcrlztes Haliday, 1849) are treat€d as a group most closely related to the Euphorinae, and the Microtypini are included in the Homolobinae, New tribes are: Leptorhaconotini trib. nov. (position uncertain. provisionally in the Doryctinael based on the genus Leptorha<ttrolr/s Granger, 1949 from Malagasy), Dyscoletini rib. nov. (included in the Blacinae and based on the Holarctic genus Dysco,/rtes Haliday, 1840), and Acampsini trib. nov. (included in the Sigalphinae. and based on the Palaearctic genus .4 carz2si.r Wesmael, 1835). The tribus Minangini De Saeger (based on the Afrotropical genus Minungu Cameron, 1906) is removed liom the Cheloninae and included in the Sigalphinae. C. \'on Achterberg, Rijksmtseun vtn Nattrurlijke Historie, Postbts 9517, NL'2300 RA Lciden, t h c N etherlands. The phylogeny of the Braconidae has been the was the research of Edson and Vinson ( 1979) on subject of only a limited number of papers. The the venom apparatus of female braconids. basis was laid by Griffiths (1964, only The main reason for the confusion in the sys- Alysiinae-Dacnusini), iapek (1965 & 1970), and tematics of the Braconidae is the occurrence of Tobias ( 1967). ln all these papers general biology many parallel evolutionary trends (leading to was of importance for the construction of a final " homeoplasies"); for a list see Van Achterberg, classification. Van Achterberg (1976) gave a hi- 1976. A good example is the formation of a storical review and tried to construct a division metasomal carapace (Tobias & Dudarenko, and key to the subfamilies of the Braconidae. 1974). Comparative morphology of the posterior mainly based on morphological characters of the side of the head (Tobias & Potapova, 1982) and final instar larvae and (some additional) features grouping on base of overall similarity, result in of the adults, especially of the lst metasomal one huge mixed group ( = type H II): inclrrding tergite 1V an Achterberg. 1974). part of the Agathidinae, Blacinae, Euphorinae, The (internal) relationship of some subfamilies Neoneurinae, Macrocentrinae. Microgastrinae, hav e been analy zed cladi sti cally : Amicrocentri- Ichneutinae, part of Opiinae, Gnaptodontinae, nae (Van Achterberg, 1979a), Xiphozelinae (id.. Sigalphinae, Orgilinae. Homolobinae, Acaelii- l979b). Homolobinae (id.. 1979c), Helconinae nae, Cheloninae, Helconinae, and Cenocoelii- (id., 1983a), Gnaptodontinae (id., 1983b), and nae. Additionally a large. more homogenous Microgastrinae (Mason, I98l), but the majority group (B II with Rogadinae, some Doryctinae, ofthe groups remain untreated. A major advance Braconinae, and large part of Opiinae), a smaller 42 C. van Achterberg ' -'- .a - -)' i<-+-1''\S:r-==--r ,( ) t I S ,y': il / 6 ': '; ----'r"-' I/,Q \&/ ^ } )-*< d/ 5 --- --*- Figs. l-l l. Bracon subrrlosrts Sz6pligeti, holotype 9, Braconidae-Braconinae. - l. Habitus. latera.l aspect. - 2- Wings. - 3- Scapus and pedicellus, outeraspect. - 4. Outer middle claw. 5. Apex ofovipositor. - 6. Hind leg. - 7. Head, dorsal aspect. - E. Head, frontal aspect. - 9. Detail of vein l-SR of fore wing. - 10. Thorax. doisal aspect. - I l. lst 3rd metasomal tergites. dorsal aspect. - l. 2,6. Scale line : I mm. -3-5. Scale-line =5mm.- 7-l t. Scale-line = 2 mm. homogeneous group (B I with part of Doryctinae but no synapomorphy has yet been detected. For and Histeromerinae) and groups with specialized such a group the name "interim-group" is pro- head morphology (A ll with Alysiinae, Ag II posed because of its provisional nature and to containing part of Agathidinae with elongated indicate that it is "sandwiched" between groups head, H lll with Cltrvsopolthtlnnr s and with autapomorphies. At least some of the in- Wesmaelia (Euphorinae) and H IV with Cerco- terim-groups may be poly- or paraphyletic and barconinae). Only these latter groups possess will certainly be subdivided in the future. Candi- "positive apomorphous character-states" in the dates within e.9., the Doryctinae, are the tribes head morphology, opposed to "negative Evaniodini Fischer (Neotropics) and Leptorha- apomorphous character-states" or "reductional conotini (tribus nov., based on Leptorlruconotus character-states" (Van Achterberg, 1983b). The Granger, 1949 from Malagasy), which do not fit latler concerns reductions. which occur rather well within the Doryctinae: other groups lrequent[y and independently in different groups; assigned very provisionally to a subfamily are thus easily leading to incorrect conclusions. The the Microtypini (Homolobinae) and the Aneuro- chance of pafallelism in "positive apomorphous braconini (Orgilinae). The only possibility for a character-states" (especially when complicated more natural system is to find more (positive) struclures are involved) is less and is lound only apomorphous character-states by careful cladi- rarely in distantly related groups. but the sec- stic analysis of large collections. It is obvious ondary loss of a stntcture should be reckoned lhat the cladistic analysis as summarized in Figs. with. Another problem is the lack of synapomor- 12-17 is a very provisional one to stimulate fur- phous character-states for some groups. For in- ther research; e.g., larvae of too many subfami- stance, the Doryctinae and the Rogadinae seem lies (22 out of 35) are not or hardly morphologi- to be sister-groups because of overali similarity, cally known. Essay on the phylogeny of Braconidae (Hymenoptera: Ichneumonoidea) 43 New or less known characters used 1950), but the base of the "tail" is widened as in the Euphorinae (Euphorini: Jackson, 192E; analysis for the Brindley, 1939: Centistini: Loan & Holdaway, Despite the huge size of the Braconidae (t 1962: Meteorini: Simmonds, 1947), a condition 40.000 spp. or more) this paper attempts to gi\e dissimilar to the (plesiomorphous) condition in an overall analysis of the sublhmilies. Many early instar larvae ofgroup IL In the Aphidiinae characters have been reviewed in the material some Aphidiini may have a somewhat widened available and some characters found to be stable base ofthe "tail". a condition absent in the other enough within genera or tribes to be used for the tribes (e.g., Stari, 1966). The young larval in- cladistic analysis. However, several exceptions stars of many groups still need to be investigat- are present, but these are usually not mentioned ed, especially in such controversial groups as the because they appear to be secondary develop- Acaeliinae, Miracinae, Dirrhopinae, Gnapto- ments; e.g., the few Ichneumonidae-Cryptinae dontinae, Meteorideinae, Blacinae, and Sigal- with 2nd and 3rd metasomal tergites united. phinae. The function of the caudal vesicle is un- L Venom apperutus of fentale (Edson & Vin- certain; it may be an accessory respiratory or- son, 1979). Group II and a majority of the Ap- gan, used for the excretion or for the avoiding hidiinae posses a type I venom reservoir with a encapsulation by the host; an explanation is wall containing many longitudinal and circular needed to account for the disappearance of the muscles. The minority of the Aphidiinae and the organ in later instars of the endoparasitic larva. past groups lll and lV have type II venom reservoir: 3. Euo- verstrs e ndopttrasi tislt. ln the thin-walled with relatively few muscles. Out- conlusion has arisen about the ectoparasitism of group comparison reveals that type I is the several subfamilies in the groups III and IV. apomorphous state (as outgroup is used the sis- because (as was discovered later) numerous en- ter-group of the Braconidae as depicted in Fig. doparasites have a final (obligatorily) ectopara- l2)l Ihis state is probably lost independently in sitic phase. External feeding of endoparasites the tribe Praini of the Aphidiinae, a group with was observed in the Macrocentrinae (Daniel. several other (not related) apomorphous charac- 1932), Homolobinae (Allen, 1977). Helconinae ter-states. The venom apparatus of the following (Brachistini: Haeselbarth, 1962)' Cheloninae subfamilies has not examined by Edson & Vin- (Vance, 1932), and Agathidinae (Simmonds. son: Histeromerinae, Mesostoinae, Ypsistoceri- 19471 Nickels et al., 1950). Endoparasiles of nae, Gnaptodontinae, Acaeliinae, Miracinae, group I (e.g., Alysiinae: Caudri. l94l) and the Dirrhopinae, Meteorideinae. Cercobarconinae, Aphidiinae, also some parasites ofthe groups III Trachypetinae, Xiphozelinae, Sigalphinae, and IV ( Microgastrinae: Vance. l93l: Cardio- Khoikhoiinae, Betylobraconinae. and Amicro-
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