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Phylogenetic Analysis of Hydrophiloidea Based on Characters of the Head of Adults and Larvae (Staphyliniformia)

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Phylogenetic Analysis of Hydrophiloidea Based on Characters of the Head of Adults and Larvae (Staphyliniformia) ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Koleopterologische Rundschau Jahr/Year: 1994 Band/Volume: 64_1994 Autor(en)/Author(s): Beutel Rolf Georg Artikel/Article: Phylogenetic analysis of Hydrophiloidea based on characters of the head of adults and larvae (Staphyliniformia). 103-131 ©Wiener Coleopterologenverein (WCV), download unter www.biologiezentrum.at Koleopterologische Rundschau 64 103 - 131 Wien, Juni 1994 Phylogenetic analysis of Hydrophiloidea based on characters of the head of adults and larvae (Coleoptera: Staphyliniformia) R.G. BEUTEL Abstract Characters of the head of adults and larvae of Hydrophiloidea (sensu CROWSON 1955) are analyzed phylogenetically. The monophyly of the superfamily is strongly suggested by autapomorphies of adults such as palpicorn antenna, antenna! groove, postocular emargination, complex hypopharyngeal Suspensorium, distal galeomere composed by fimbriate lamellae, large, quadrangular mental plate, and others. First instar larvae of Hydrophiloidea possess cephalic egg bursters as a common derived feature. Hydrophiloidea (excl. Hydraenidae) share two autapomorphies of adults and five larval synapomorphies such as the loss of the clypeolabral and frontoclypeal sutures, and the insertion of the galea on palpomere I. Hydrophiloidea (excl. Hydraenidae and Spercheidae) are characterized by one autapomorphy of adults and 5 larval autapomorphies such as prognathism, strongly reduced intra- maxillary moveability, subdivided cardo, partly reduced maxillary fossa, and rudimentary lacinia. The transformation of the broad gula into a median gular suture, contiguous posterior tentorial grooves which are distant from the foramen occipitale, and the presence of a nasal projection and conspicuous triangular adnasalia are significant larval synapomorphies of Helophoridae, Epimetopidae, Georissidae, and Hydrophilidae. Helophoridae are the sistergroup of Georissidae, Epimetopidae, and Hydrophilidae. A separate, cranial submental sclerite is a possible synapomorphy of the latter families. Hydrophilidae are characterized by hyperprognathism, a V-shaped submental suture, complete reduction of the maxillary groove, and dorsal insertion of the antennae. The presence òf a pronotai shield which covers parts of the dorsal wall of the head capsule of adults, a strongly deflexed head, cuticular spines along the mesal edges of the larval adnasalia, and an elongated palpomere I with a minute galea are possible synapomorphies of Epimetopidae and Georissidae. Key words: Hydrophiloidea, head structures, adults, larvae, phylogenetic analysis Introduction The concept of the superfamily Hydrophiloidea or Palpicornia was subject to several changes during its taxonomic history. BÖVING & CRAIGHEAD (1931) included Histeridae, but excluded Hydraenidae in their synopsis of the larval forms of Coleoptera. Both families, Hydraenidae and Histeridae, were included in Palpicornia in another larval study by EMDEN (1942). Hydrophiloidea (or Palpicornia) include Hydraenidae, Spercheidae, Hydrochidae, Georissidae, and Hydrophilidae (incl. Helophorinae) in a system proposed by D'ORCHYMONT (1916, 1919) and by CROWSON (1955). Histeroidea are considered as members of Hydrophiloidea, whereas Hydraenidae are transferred to Staphylinoidea, close to Ptiliidae in several recent studies (DYBAS 1976; LAWRENCE 1982; COSTA et al. 1988). Hydrophiloidea include the families Helophoridae, Epimetopidae, Georissidae, Hydrochidae, Spercheidae, and Hydrophilidae in a comprehensive work by HANSEN (1991a). A sistergroup relationship between those groups and Histeroidea is considered as more likely than a sistergroup relationship between Hydrophiloidea (sensu HANSEN 1991a) and Hydraenidae. The present study of characters of the head of larvae and adults is considered as a contribution towards a clarification of the monophyly or paraphyly of Hydrophiloidea (sensu CROWSON 1955) and of the interrelationships of the hydrophiloid subgroups. Emphasis is placed upon a detailed ©Wiener Coleopterologenverein (WCV), download unter www.biologiezentrum.at 104 Koleopt. Rdsch. 64 (1994) discussion of the characters presented. It is well understood that a "final solution" of these questions requires an analyis of a broader set of characters than presented in this paper, even though the head is the most complex structure of an insect body. Detailed study of more structural features (especially internal characters) of adult and larval Staphyliniformia and a phylogenetic evaluation of those data should be the purport of future studies. Material and methods Selected larvae and newly hatched adults were imbedded in Histoplast S for microtome sections (5 /xm). The sections were stained with haemalaun. Drawings were made using an ocular grid. Scanning electron microscopy was accomplished after specimens were cleaned with ultra sound, dried (critical point method) and coated with gold-palladium (Cambridge Stereoscan Mk 2). The determination of the polarity of character states is based on the outgroup and ingroup comparison method described by WATROUS & WHEELER (1981). The outgroup includes Staphylinoidea and other Polyphaga, Adephaga, Myxophaga, and Cupedidae. Character states found in representatives of these groups and subgroups of Hydrophiloidea are considered plesiomorphic. The corresponding character states in other subgroups of Hydrophiloidea as apomorphic. Only synapomorphic i.e. common derived character states are criteria for phylogenetic relationship. Information on several groups discussed in this context, especially larval Staphylinoidea (e.g. Ptiliidae, Leiodidae, Leptinidae) are taken from the literature (e.g. DYBAS 1976; LAWRENCE 1982; STEHR 1991). Muscular nomenclature and corresponding numbers used in the illustrations are according to KELER (1963). Plesiomorphic character states = 0; apomorphic character states in a transformation series = 1, 2; alternative apomorphic character states = 1*; reversal = 0,5R (partial), OR (total). List of species examined: Hydraenidae: adults: Orchymontia spinipennis BRAUN, Prosthetops WATERHOUSE sp., Gymnochthebius chilenus (J.BALFOUR-BROWNE), Meropathus campbellensis BROOKES, Ochthebius melanescens DALLA TORRE, Hydraena britteni JOY, Limnebius crassipes KUWERT, L. papposus MULSANT Spercheidae: adults: Spercheus emarginatus (SCHALLER); larvae: Spercheus emarginatiti (SCHALLER) Hydrochidae: adults: Hydrochus angustatus GERMAR Georissidae: adults: Georissus crenulatus (ROSSI) Helophorinae: adults: Helophorus aquaticus (L.), Helophorus minutus FABRICIUS; larvae: Helophorus FABRICIUS ssp. Hydrophilinae: adults: Coelostoma orbiculare (FABRICIUS), Sphaeridium bipustulatum FABRICIUS, Cercyon impressiti (STURM), Hydrobius fuscipes (L.), Anacaena globulus (PAYKULL), A. limbata (FABRICIUS), Laccobius minutus (L.), Helochares obscurus (MÜLLER), Enochrus bicolor (FABRICIUS), E. testaceus (FABRICIUS), E. qffinis THUNBERG, Hydrochara caraboides (L.), Hydrophilus piceus (L.), H. aterrimus ESCHSCHOLTZ, Berosus signaticollis (CHARPENTIER); larvae: Sphaeridium bipustulatum FABRICIUS, Enochrus THOMSON sp., Hydrobius LEACH sp., Hydrophilus LEACH sp., Sperchopsis tesselata (ZŒGLER), Berosus LEACH sp. Histeridae: adults: Margarinotus cadaverinus (HOFFMANN); larvae: Saprinus semistriatus (SCRIBA), Paralister BlCKHARDT sp., Histeridae ssp. Silphidae: adults: Oeceoptoma thoracica (L.), Silpha obscura L., Necrophorus vespillo (L.); larvae: Silpha L. sp. Ptiliidae: Acrotrichis MOTSCHULSKY sp. Leiodidae: adults: Catops PAYKULL sp.; larvae: Catops sp. Scydmaenidae: Cephennium MÜLLER et KUNZE sp., Neuraphes THOMSON sp. Staphylinidae: adults: Philonthus decorus (GRAVENHORST), Ocypus olens (MÜLLER); larvae: Philonthus CURTIS sp. Leptinidae: adults: Platypsyllus castoris RITSEMA Hydroscaphidae: larvae: Hydroscapha LECONTE sp. ©Wiener Coleopterologenverein (WCV), download unter www.biologiezentrum.at BEUTEL: Phylogenetic analysis of Hydrophiloidea (STAPHYLINIFORMIA) 105 Cupedidae: adults: Priacma serrata LECONTE Abbreviations and muscular nomenclature used in Figs. 1-36: 7 M. labroepipharyngalis gu gula 8 M. frontolabralis gur gular ridge 11 M. craniomandibularis intemus gus gular suture 12 M. craniomandibularis externus hy hypopharynx 15 M. craniocardinalis lbr labrum 17 M. tentoriocardinalis lc lacinia 18 M. tent.-stipitalis md mandible 19 M. craniolacinialis mo mola 41 M. frontohypopharyngalis mst mediostipes 42 M. tent.-hypopharyngalis mt mentum 43 M. clypeopalatalis nas nasale 44 M. clypeobuccalis Pf palpifer 45 M. frontobucc. anterior pguscl pregular sclerite 46 M. frontobucc. posterior ph pharynx pi palpus labialis adnas adnas ale pml palpomere I amgupl anteromedian gular plate pmt prementum ant antenna pmtr premental retractors antm antennal muscles pmx palpus maxillaris ata anterior tentorial arm poem postocular emargination bst basistipes Ptg posterior tentorial groove c cardo ret retinaculum ce compound eye rm ring muscle cly clypeus sap sensorial appendage esci cervical sclerite smt submentum dta dorsal tentorial arm soes suboesophageal ganglion eph epipharynx st stipes fcls frontoclypeal suture ste stemmata fm fossa maxillaris sus anterior hypopharyngeal Suspensorium fs frontal suture tb tentorial bridge ga galea y-s Y-shaped suture gf ganglion frontale Character analysis (Table I) I. Autapomorphies of Hydrophiloidea (sensu CROWSON 1955) Adult features 1. Head protruding (1.0)/ head strongly retracted, transverse posterodorsal ridge present (1.1)
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