Antennal Sensilla of Trichoptera and Lepidoptera: Phylogenetic Considerations
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BULLETrN DE L'INSTITUT ROYAL DES SC IENCES NATURELLES DE BELGIQUE ENTOMOLOGIE, 74 : 69-71, 2004 BULLETIN VAN HET KONINKLIJK BELGISCI-IINSTITUUT VOOR NATUURWETENSC HAPPEN ENTOMOLOGIE, 74 : 69-71 , 2004 Antennal sensilla of Trichoptera and Lepidoptera: Phylogenetic considerations By Michel J. FAUCHEUX Abstract ca:loconica ("s. ca:loconica"); multiparous s. placodea (" s. placo'ide disco'idale": Fig. I); multi porous s. auricillica (" s. Most of the sensillar types found on the antennae of Lepidoptera bicorne" : Fig. 3, "s. bifide": Figs. 4, 5, "s. oto'ide": Fig. 6, "s. already exist in Trichoptera. The sensill a auricillica are not specific placo'ide": Fig. 7, "s. placo'ide denticulee" : Fig. 8, "s. placo'ide to Lepidoptera. The sensill a placodea which are common in Trichop spherique", "s. placo'ide cyiindrique"); multi porous s. basico tera occur only in th e more primitive lepidopterans Micropterigid ae. nica ("s. conique"); multi porous triforked sensilla ("s. trifides": Key words: Trichoptera, Lepidoptera, anten na, sensill a, phylogeny. Fig. 2); aporous s. squamiformia ("s. squamifom1ia"). The term " placo'ide" used by Denis covers different types of sensilla. The antenna! sensilla of Lepidoptera have been the subject of a great many publications (review in FAUCHEUX, 1987; 1999). Figures 9 to 16 represent sensilla bearing a surprising resemblance to those of Trichoptera. The comparison between La plupart des types sensill aires presents sur les antennes des the sensory equipment of the two orders permits several U:pidopteres existent deja chez les Trichopteres. Les sensilles auricil conclusions. liformes ne so nt pas particulieres aux U:pidopteres. Les sensilles Sensilla placodea in Trichoptera are an important sensillar placo'ides qui so nt communes chez les Trichopteres sont pn~sentes type, whose sexual dimorphism is manifested in a hi gher num se ulement chez les lepidopteres les plus primitifs, les Micropterigidae. ber of sensilla in the males, and which cover entirely one of the Mots-clefs: Trich opteres, U:pidopteres, antenne, sensilles, phyla two faces of the segments (SLIFER & SEKJ-IO N, 1971 ; DEN IS, genese. 1985). They exist in Rhyacophilidae, Glossosomatidae, Hydro ptilidae, Ecnomidae, Molannidae. The three first families are considered as the most primitive of Trichoptera (DESPAX, The two orders Trichoptera and Lepidoptera are grouped to 1951 ). Now, sensilla placodea in Lepidoptera only exist in gether in the superorder Amphiesmenoptera, the relationship the suborder Zeugloptera, with the family Micropterigidae between the two orders is a genuine sistergroup relationship (FAUCHEUX, 1997). In the micropterigid moths, they are present (KRISTENSEN, 1975 , 1981 ). Numerous characters in the adult in small numbers, I to 2 per segment, and they do not exhibit and larval ground plan are synapomorphic of Trichoptera and any sexual dimorphism. Lepidoptera. However, nothing is known as concerns the com The triforked sensilla of Sericostoma galeatum (Fig. 2) parison between the anteimal sensilla into two orders. The only resemble short biforked sensilla basiconica of the limacodid reference appears to be that of HALLBERG & HANSSON ( 1999) Latoia thamia (Fig. I 0) . They possess together a basal stylus who consider that "The ancestral eriocraniids exhibit a sensillar and a sens01y cone, bi- or triforked. Until now, the biforked pattern that more closely resembles the more primitive sister sensilla basiconica have been discovered only in L. thamia group Trichoptera than its more advanced relatives in the (FAUCHEUX, 1999). Lepidoptera''. This affirmation is in fact based on false argu The sensilla bifida of Micropterna sequax (Fig. 3) are similar ments (FAUCHEUX, 2004a). to certain long biforked sensilla basiconica of Agathiphaga For the study of sensilla, the antennae were dehydrated in queenslandensis (FAUCHEUX , 1990a; 2004b). In this moth, this absolute ethanol, mounted on specimen holders and coated with sensillar type is polymorphic and some sensilla with flattened a thin layer of gold and palladium. Preparations were examined branches must be classed with the "auricillicum" type. ln with a scanning electron microscope. Lepidoptera, these sensilla are present only in the suborder The structure of trichopteran antenna! sensilla has only been Aglossata which consists only of the Agathiphagidae family. described in a few studies (SLIFER & SEKHON, 1971 ; WELLS , Certain sensilla bifida, placodea and "oto'ides " des Trichop 1984; DEN IS, 1985). The study by Denis which concerns 18 teres (Figs. 4-8) are in fact sensilla auricillica, according to the families and 23 species offers most information. Thus, accord terminology adopted in Lepidoptera (FAUCHEUX, 1999). Indeed, ing to present terminology (ZACHARUK, 1985), the sensi lla of they show remarkable similarities with sensilla auricillica Trichoptera described by Denis may be classed under the (Figs. 12-16). Moreover, the trichopteran Neureclipsis bimacu following types: uniparous sensilla chaetica ("sensilles tri lata possesses a variety of shape in these sensilla (Figs. 4-5) cho'ides cannel ees"); aporous s. chaetica ("s. chaetica" ); mul such as th e lep idopteran Trichophaga tapetzella (Figs. 12-13). tiparous s. trichodea ("s. tricho'ides annelees"); multiparous s. In one family of Trichoptera and of Lepidoptera, sensilla ,, 70 Michel J. FAUCHEUX: Sensilla of Trichoptera a nd Le pidoptera 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Figs. 1-8 - Antenna! sensilla of Trichoptera . I - "sensille pl aco'ide disco'idale" of Ecnomus te 11 ellus, Ecnomidae; 2 - "sensille trifide" of Sericostoma galeatus, Sericostomatidae; 3- "sensi ll e bicorne" of Microptern asequax, Limnephilidae; 4, 5- "sensilles bifides" of Neureclipsisbima culata, Polycentropidae; 6- "sensille oto'ide" of Lepidostoma hirtum, Lepidostomatidae; 7- "sensill e placo'ide" of Leptodrusus budtzi, Limnephilidae; 8 - "sensill e placo'ide" of Anabolia nervosa, Limnephilidae. (Different magni fic ations. Drawn from Deni s 1985, In Bulletin de Ia Societe Scientifique de Bretagne). Figs. 9-16 - Antenna! sensill a of Lepidoptera . 9 - sensillum placodeum of Micropterix calthel/a, Micropteri gidae; I 0 - short biforked sensillum basiconicum of Latoia thatnia, Limacodidae; I I, long biforked sensillum basiconicum of Agathiphaga queenslandensis, Agathiphagidae; 12-16 - sensilla auricillica: 12, 13 - Trichophaga tapetzel/a , Tineidae; 14 - Tin eola bisselliel/a, Tineidae; 15 - Heliothis armigera conferta, Noctuidae; 16 - Noctua pronuba, Noctuidae. [Different magnifications. Drawn from Faucheux 1999 (9, 10), 2004 b (II), 1989 (12, 13), 1987 ( 14), 1990b (16) and Flower & Helson 1971 (15)]. auricillica show the same degree of variation (Figs. 7, 8, who call ed them " thin-wall ed pegs" . They are a lways largely 15, 16). present in Lepidoptera. Sensilla creloconica in Lepidoptera belong to two subtypes: Finally, we are for the moment the only person to have naked and with a fringe of mi crotrichia. The first is considered defined on two Lepidoptera, " cupuliform organs" comprising as the most primitive and the second has only been described in hemispherical dome pierced by circular orifice and including a the Lepidoptera. Now, the trichopte ran insects possess the cuticular formation; they are unobtrusive and few in number naked creloconicum, i. e. Micropterna sequax while a hint of a (FAUCHEUX, 1999). Similar organs possessing the same quali fringe of microtrichia appears in Rhyacophila fascia/a (DENI S, ti es have been found in Trichoptera where they are called 1985). " pores" by DEN IS (1985) and " coelospherical sensi lla" by Sensilla squamiformia are common to both Trichoptera and WELL S ( 1984). [n conclusion, most of the sensillar types found Lepidoptera. The uniparous sensill a chaetica, aporous sensill a on the antenna of Lepidoptera a lready exist in Trichoptera. The chaetica and multi porous sensilla trichodea are ubiquitous types sensill a a uricillica are not specific to Lepidoptera as has often in Lepidoptera as in Trichoptera ("s. tricho'ides cannelees", been claimed (FAUC HEUX, 1987). Certain types, such as sensilla s. chaetica, "s. tricho'ides annelees"). The multiparous sensill a pl acodea, which are common in Trichoptera, exist only in the basiconica in Trichoptera have not b een cleary defined by more primitive Lepidoptera. Other types are characteri stic of a DEN IS ( 1985) but were identified by SLI FER & SEKHO N ( 1971) suborder or of a family of Lepidoptera. References DEN IS, C., 1985. Etude comparee des microstTuctures anten DESPAX, R., 195 1. Ordre des Tri chopteres. fn: GRASSE, P.P. naires des Trichopteres ad ultes. Bulle tin de Ia Societe Scienti (Editeur), Traite de Zoo Iogie X ( I er fasc.). Masson et Cie, Paris, jiqued e Bretagne, 57: 103- 114. pp. 125-173. Short Notes 71 FAUCHEUX, M.J., 1987. Recherches sur les organes sensoriels des Sciences Naturelles de !'Ouest de Ia Fran ce (n.s.), 26: impliques dans le comportement de ponte chez deux lepidop 138-139. teres a larves keratinophages: Tin ea /a bisselliella Humm. et FLOWER, N .E. & HELSON, G.A.H., 1971. The structure of Monopis crocicapitella Clem. (Tineidae). These de Doctoral es sensors on the antennae and proboscis of Heliothis armigera sciences, Univ. Nantes, 511 pp. conferta Hubn. New Zealand Journal of Science, 14: 810-815. FAUCHEUX, M.J., 1989. Antenna! sensilla in male and female HALLBERG, E. & HANSSON , B.S., 1999. Arthropod sensilla: carpet moth, Trichophaga tapetzella L. (Lepidoptera: Tinei morphology and