Alberti G (2000) Chelicerata. In: Adiyodi KG, Adiyodi RG (eds) Reproductive biology of invertebrates. 9B Oxford and IBH Publishing Co, Queensland, pp 311–388

Alexander RD (1964) The evolution of mating behavior in arthropods. Symp R Entomol Soc Lond 2:78–94

Bareth C (1965) Le spermatophore de Lepidocampa (Diploures Campodéidés). C R Biol 260:3755–3757

Betsch JM (1980) Eléments pour une monographie des Collemboles Symphypléones. Rev Ecol Biol Sol 116A:1–227

Betsch-Pinot MC (1977) Les Parades Sexuelles Primitives Chez Les Collemboles Symphypléones. Rev Ecol Biol Sol 14:15–19

Beutel RG, Weide D (2005) Cephalic anatomy of Zorotypus hubbardi (Hexapoda: Zoraptera): new evidence for a relationship with Acercaria. Zoomorph 124:121–136

Blancquaert JP, Mertens J (1977) mating behavior in Sphaeridia pumilis (Collembola). Pedobiologia 17:343–349

Blanke A, Wipfler B, Letsch H, Koch M, Beutel R, Misof B (2012) Revival of Palaeoptera—head characters support a monophyletic origin of Odonata and Ephemeroptera (Insecta). Cladistics 28(6):560–581

Blanke A, Greve C, Wipfler B, Beutel R, Holland B, Misof B (2013) The identification of concerted convergence in insect heads corroborates Palaeoptera. Syst Biol 62(2):250–263

Bretfeld G (1970) Grundzüge des Paarungsverhaltens europäischer Bourletiellini (Collembola, Sminthuridae) und daraus abgeleitete taxonomische-nomenklatorische Folgerungen. Z Zool Syst Evol 8:259–273

Bretfeld G (1977) Der Zyklus von Häutung, Paarung und Eiablage bei den Weibchen von Heterosminthurus insignis (Reuter, 1876) (Collembola, Symphypleona). Rev Ecol BIol Sol 14:1–13

Choe JC (1992) Zoraptera of Panama with a review of the morphology, systematics, and biology of the order. In: Quintero D, Aiello A (eds) Insects of Panama and Mesoamerica: selected studies. Oxford University Press, Oxford, pp 249–256

Choe JC (1994) Sexual selection and mating system in Zorotypus gurneyi Choe (Insecta: Zoraptera): I. Dominance hierarchy and mating success Behav Ecol Sociobiol 34:87–93

Choe JC (1995) Courtship feeding and repeated mating in Zorotypus barberi (Insecta: Zoraptera). Animal Behav 49(6):1511–1520

Choe JC (1997) The evolution of mating systems in the Zoraptera: mating variations and sexual conflicts. In: Choe JC, Crespi BJ (eds) The evolution of mating systems in insects and arachnids. Cambridge University Press, Cambridge, pp 130–145

Dallai R, Mercati D, Gottardo M, Machida R, Mashimo Y, Beutel RG (2011) The male reproductive system of Zorotypus caudelli Karny (Zoraptera): sperm structure and spermiogenesis. Arthropod Struct Dev 40(6):531–547

Dallai R, Mercati D, Gottardo M, Dossey AT, Machida R, Mashimo Y, Beutel RG (2012a) The male and female reproductive systems of Zorotypus hubbardi Caudell, 1918 (Zoraptera). Arthropod Struct Dev 41(4):337–359

Dallai R, Mercati D, Gottardo M, Machida R, Mashimo Y, Beutel RG (2012b) The fine structure of the female reproductive system of Zorotypus caudelli Karny (Zoraptera). Arthropod Struct Dev 41(1):51–63

Davey KG (1960) The evolution of spermatophores in insects. Proc R Entomol Soc Lond 35:107–13

Dobzhansky TH, Ayala FJ, Stebbins GK, Valentine JW (1977) Evolution. Freeman WH & co, San Francisco

Döring D (1986) On the male reproductive biology of Orchesella cincta (Collembola, Entomobryidae). In: Dallai R (ed) 2nd International Seminar on Apterygota. University of Siena, Siena, pp 171–176

Dybas LK, Dybas HS (1981) Coadaptation and taxonomic differentiation of sperm and spermathecae in featherwing beetles. Evolution 35:168–174

Eberhard WG (1985) Sexual selection and animal genitalia. Harvard University Press

Ehrnsberger R (1977) Fortpflanzungsverhalten der Rhagidiidae (Acarina: Trombidiformes). Acarologia 19:67–73

Ehrnsberger R (1988) Mating behavior of Linopodes sp. (Acariformes: Eupodoidea). In: Channabasavanna GP, Viraktamath CA (eds) Progress in Acarology, vol 1. IBH Publishing Co, Pvt. Ltd. New Delhi, pp 211–218

Engel MS (2003) Phylogeny of the Zoraptera. In Klass KD (ed) Proceedings of the first Dresden meeting on insect phylogeny: “phylogenetic relationships within the insect orders” (Dresden, September 19–21, 2003). Entomol Abh 61(2):147–148

Engel MS, Grimaldi DA (2002) The first Mesozoic Zoraptera (Insecta). Am Mus Novit 3362:1–20

Ewing HE (1940) The Protura of North America. Ann Entomol Soc Am 33(3):495–551

Fanciulli PP, Zizzari ZV, Frati F, Dallai R (2012) The ultrastructure of the ejaculatory duct in the springtail Orchesella villosa (Geoffroy) (Hexapoda, Collembola) and the formation of the spermatophore. Tissue Cell 44(1):32–46

Foelix RF (1992) Biologie der Spinnen, 2nd edn. Thieme, Stuttgart, pp 1–331

Friedrich F, Beutel RG (2008) The thorax of Zorotypus (Hexapoda, Zoraptera) and a new nomenclature for the musculature of Neoptera. Arthropod Struct Dev 37:29–54

Gabbutt PD (1954) Notes on the mating behavior of Nemobius sylvestris (Bosc.) (Orth., Gryllidae). Brit J Anim Behav 2(3):84–88

Grimaldi D, Engel MS (2005) Evolution of the Insects. Cambridge University Press, Cambridge

Gurney AB (1938) A synopsis of the order Zoraptera, with notes on the biology of Zorotypus hubbardi Caudell. P Entomol Soc Wash 40:57–87

Gwynne DT (1988) Courtship feeding and the fitness of female katydids (Orthoptera: Tettigoniidae, Requena verticalis). Evolution 42:545–555

Gwynne DT (1990) The katydid spermatophore: evolution of a parental investment. In: Rentz DC, Bailey W (eds) The biology of Tettigoniidae., pp 27–40

Gwynne DT, Bowen B, Codd C (1984) The function of the katydid spermatophore and its role in fecundity and insemination (Orthoptera: Tettigoniidae). Aust J Zool 32:15–22

Higginson DM, Pitnick S (2011) Evolution of intra-ejaculate sperm interactions: do sperm cooperate? Biol Rev Camb Philos Soc 86:249–270

Higginson DM, Miller KB, Segraves KA, Pitnick S (2012a) Female reproductive tract form drives the evolution of complex sperm morphology. P Natl Acad Sci USA 109:4538–4543

Higginson DM, Miller KB, Segraves KA, Pitnick S (2012b) Convergence, recurrence and diversification of complex sperm traits. Evolution 66(5):1650–1661

Huber BA (2010) Mating positions and the evolution of asymmetric insect genitalia. Genetica 138(1):19–25

Hünefeld F (2007) The genital morphology of Zorotypus hubbardi Caudell, 1918 (Insecta: Zoraptera: Zorotypidae). Zoomorphology 126:135–151

Hünefeld F, Beutel RG (2005) The sperm pumps of Strepsiptera and Antliophora (Hexapoda). J Zool Syst Evol Res 43(4):297–306

Immler S, Pitnick S, Parker GA, Durrant KL, Lüpold S, Calhin S, Birkhead TR (2011) Resolving variation in the reproductive tradeoff between sperm size and number. Proc Nat Acad Sci USA 108(13):5325–5330

Jamieson BGM, Dallai R, Afzelius BA (1999) Insects. Their Spermatozoa and Phylogeny. IBH Publishing Ltd., Oxford

Janetschek, H (1970) Protura (Beintastler). In: Helmcke JG, Stark D, Wermuth H (eds) Handbuch der Zoologie. Walter de Gruyter & co., Berlin. 4(2) 2/3:1–72

Kaestner A. (1965) Lehrbuch der Speziellen Zoologie, Band I. Wirbellose, 1. Teil, 2. Aufl. Fisher G. Stuttgart

Kuznetsova VG, Nokkala S, Shcherbakov DE (2002) Karyotype, reproductive organs, and pattern of gametogenesis in Zorotypus hubbardi Caudell (Insecta: Zoraptera, Zorotypidae), with discussion on relationships of the order. Can J Zool 80:1047–1054

Lewis C, Long TAF (2005) Courtship and reproduction in Carybdea sivickisi (Cnidaria: Cubozoa). Mar Biol 147:477–483

Mann T (1984) Spermatophores: development, structure, biochemical attributes and role in the transfer of spermatozoa. Springer, New York

Manton SM (1938) Studies on Onychophora IV. The passage of spermatozoa into the ovary in Peripatopsis Phil Trans R Soc Lond 228:421–442

Martens J (1978) Spinnentiere, Arachnida. Weberknechte, Opiliones. In: Fischer G (ed) Die Tierwelt Deutschlands. Jena

Mashimo Y, Machida R, Dallai R, Gottardo M, Mercati D, Beutel RG (2011) Egg structure of Zorotypus caudelli Karny (Insecta, Zoraptera, Zorotypidae). Tissue Cell 43:230–237

Mays DL (1971) Mating behavior of Nemobiine Crickets: Hygronemobius, Nemobius, and Pteronemobius (Orthoptera: Gryllidae). Fla Entomol: 54(2):113–126

McCartney J, Potter MA, Robertson AW, Telscher K, Lehmann G, Lehmann A, Von-Helversen D, Reinhold K, Achmann R, Heller KG (2008) Understanding nuptial gift size in bush-crickets: an analysis of the genus Poecilimon (Tettigoniidae: Orthoptera). J Orthopt Res 17(2):231–242

Miller GT, Pitnick S (2002) Sperm-female coevolution in Drosophila. Science 298:1230–1233

Minder AM, Hosken DJ, Ward PI (2005) Co-evolution of male and female reproductive characters across the Scathophagidae (Diptera). J Evolution Biol 18:60–69

Pitnick S, Markow TA (1994) Male gametic strategies: Sperm size, testes size, and the allocation of ejaculate among successive mates by the sperm-limited fly Drosophila pachea and its relatives. Am Nat 143:785–819

Pitnick S, Markow TA, Spicer GS (1999) Evolution of multiple kinds of female sperm-storage organs in Drosophila Evolution 53:1804–1822

Pitnick S, Hosken DJ, Birkhead T (2009) Sperm morphological diversity. In: Birkhead T, Hosken DJ, Pitnick S (eds) Sperm Biology: An Evolutionary Perspective. Academic, Oxford, pp 69–149

Proctor HC (1998) Indirect sperm transfer in Arthropods: behavioral and evolutionary trends. Annu Rev Entomol 43:153–74

Rugman-Jones PF, Eady PE (2008) Co-evolution of male and female reproductive traits across the Bruchidae (Coleoptera). Funct Ecol 22:880–886

Schaller F (1971) Indirect sperm transfer by soil arthropods. Annu Rev Entomol 16:407–446

Schaller F (1979) Significance of sperm transfer and formation of spermatophores in arthropod phylogeny. In: Gupta AP (ed) Arthropod Phylogeny. Van Nostrand Reihold Co, New York-Toronto-London, pp 587–608

Shetlar DJ (1978) Biological observations on Zorotypus hubbardi Caudell (Zoraptera). Entomol News 89:217–223

Silvestri F (1913) Descrizione di un nuovo ordine di insetti. Boll Lab Zool Gen Agrar Portici 7:193–209

Simmons LW, Parker GA (1989) Nuptial Feeding in Insects: Mating Effort versus Paternal Investment. Ethology 81(4):332–343

Simmons LW, Craig M, Llorens T, Schinzig M, Hosken D (1993) Bushcricket spermatophores vary in accord with sperm competition and parental investment theory. Proc R Soc Lond B 251(1332):183–186

Sturm H (1978) Zum Paarungsverhalten von Petrobius maritimus Leach (Machilidae: Archaeognatha: Insecta). Zool Anz 201:5–20

Sturm H (1992) Mating behavior and sexual dimorphism in Promesomachilis hispanica Silvestri, 1923 (Machilidae: Archaeognatha: Insecta). Zool Anz 201:5–20

Sturm H, Machida R (2001) Archaeognatha. Handbuch der Zoologie. Walter de Gruyter & co. Berlin 4(37):1–213

Thornhill R (1976) Sexual selection and nuptial feeding behavior in Bittacus apicalis (Insecta: Mecoptera). Am Nat 110:529–548

Thornhill R, Alcock J (1983) The evolution of Insect mating system. Harvard University Press, Cambridge

Trautwein MD, Wiegmann BM, Beutel RG, Kjer KM, Yeates DK (2012) Advances in Insect phylogeny at the dawn of the postgenomic era. Annu Rev Entomol 57:449–468

Viscuso R, Brundo MV, Sottile L (2002) Mode of transfer of spermatozoa in Orthoptera Tettigoniidae. Tissue Cell 34:337–348

Walker TJ (1978) Post-copulatory behavior of the two-spotted tree cricket, Neoxabea bipunctata. Fla Entomol 61(1):39–40

Wedell N (1993) Spermatophore size in Bushcrickets: comparative evidence for nuptial gifts as a sperm protection device. Evolution 47(4):1203–1212

Wedell N (1994) Dual function of the Bushcricket spermatophore. Proc R Soc Lond B 258(1352):181–185

Weygoldt P (1969) Beobachtungen zur Fortpflanzungsbiologie und zum Verhalten der Geisselspinne Tarantula marginemaculata C.L. Koch (chelicerata, Amblypygi). Z Morphol Ökol Tiere 64:338–360