The beetle family Ptilodactylidae contains more than 500 extant species; however, its fossil record is scarce and remains understudied. In this study, we describe a new species of Ptilodactylidae, Ptilodactyla eocenica Kundrata, Bukejs and Blank, sp. nov., based on a relatively well-preserved specimen from Baltic amber. We use X-ray microcomputed tomography to reconstruct its morphology since some of the principal diagnostic characters have been obscured by opaque bubbles. It is the third ptilodactylid species described from Baltic amber, and the first one belonging to the subfamily Ptilodactylinae. Additionally, we summarize the classification, diversity, and distribution of both extinct and extant Ptilodactylidae.

Department of Biosystematics Institute of Life Sciences and Technology Daugavpils University Vienības 13 5401 Daugavpils Latvia

Department of Zoology Faculty of Science Palacky University 17 Listopadu 50 77146 Olomouc Czech Republic

Senckenberg Deutsches Entomologisches Institut Eberswalder Strasse 90 15374 Müncheberg Germany

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Rasnitsyn A.P., Quicke D.L.J. History of Insects. Kluwer Academic Publishers; Dordrecht, The Netherlands: 2002. pp. 1–517.

Grimaldi D., Engel M. Evolution of the Insects. Cambridge University Press; New York, NY, USA: Cambridge, UK: 2005. pp. 1–755.

De Baets K., Littlewood D.T.J. The importance of fossils in understanding the evolution of parasites and their vectors. Adv. Parasitol. 2015;90:1–51. PubMed

Jablonski D., Shubin N.H. The future of the fossil record: Paleontology in the 21st century. Proc. Natl. Acad. Sci. USA. 2015;112:4852–4858. doi: 10.1073/pnas.1505146112. PubMed DOI PMC

Dierick M., Cnudde V., Masschaele B., Vlassenbroeck J., van Hoorebeke L., Jacobs P. Micro-CT of fossils preserved in amber. Nucl. Instrum. Methods Phys. Res. A. 2007;580:641–643. doi: 10.1016/j.nima.2007.05.030. DOI

Cunningham J.A., Rahman I.A., Lautenschlager S., Rayfield E.J., Donoghue P.C.J. A virtual world of paleontology. Trends Ecol. Evol. 2014;29:347–357. doi: 10.1016/j.tree.2014.04.004. PubMed DOI

Keklikoglou K., Faulwetter S., Chatzinikolaou E., Wils P., Brecko J., Kvaček J., Metscher B., Arvanitidis C. Micro-computed tomography for natural history specimens: A handbook of best practice protocols. Eur. J. Taxon. 2019;522:1–55. doi: 10.5852/ejt.2019.522. DOI

Arriaga-Varela E., Brunke A., Girón J.C., Szawaryn K., Bruthansová J., Fikáček M. Micro-CT reveals hidden morphology and clarifies the phylogenetic position of Baltic amber water scavenger beetles (Coleoptera: Hydrophilidae) Hist. Biol. 2021;33:1–17. doi: 10.1080/08912963.2019.1699921. DOI

Kundrata R., Bukejs A., Prosvirov A.S., Hoffmannova J. X-ray micro-computed tomography reveals a unique morphology in a new click-beetle (Coleoptera, Elateridae) from the Eocene Baltic amber. Sci. Rep. 2020;10:20158. doi: 10.1038/s41598-020-76908-3. PubMed DOI PMC

Peris D., Kundrata R., Delclòs X., Mähler B., Ivie M.A., Rust J., Labandeira C.C. Unlocking the mystery of the mid-Cretaceous Mysteriomorphidae (Coleoptera: Elateroidea) and modalities in transiting from gymnosperms to angiosperms. Sci. Rep. 2020;10:16854. doi: 10.1038/s41598-020-73724-7. PubMed DOI PMC

Xing L., McKellar R.C., Xu X., Li G., Bai M., Persons W.S., IV, Miyashita T., Benton M.J., Zhang J., Wolfe A.P., et al. A feathered dinosaur tail with primitive plumage trapped in Mid-Cretaceous amber. Curr. Biol. 2016;26:3352–3360. doi: 10.1016/j.cub.2016.10.008. PubMed DOI

Xing L., Caldwell M.W., Chen R., Nydam R.L., Palci A., Simões T.R., McKellar R.C., Lee M.S.Y., Liu Y., Shi H., et al. A mid-Cretaceous embryonic-to-neonate snake in amber from Myanmar. Sci. Adv. 2018;4:eaat5042. doi: 10.1126/sciadv.aat5042. PubMed DOI PMC

Peñalver E., Arillo A., Delclòs X., Peris D., Grimaldi D.A., Anderson S.R., Nascimbene P.C., Pérez-de la Fuente R. Ticks parasitised feathered dinosaurs as revealed by Cretaceous amber assemblages. Nat. Commun. 2017;8:1924. doi: 10.1038/s41467-017-01550-z. PubMed DOI PMC

Reid M., Bordy E.M., Taylor W.L., le Roux S.G., du Plessis A. A micro X-ray computed tomography dataset of fossil echinoderms in an ancient obrution bed: A robust method for taphonomic and palaeoecologic analyses. GigaScience. 2019;8:1–8. doi: 10.1093/gigascience/giy156. PubMed DOI PMC

Wang H., Schädel M., Sames B., Horne D.J. New record of podocopid ostracods from Cretaceous amber. PeerJ. 2020;8:e10134. doi: 10.7717/peerj.10134. PubMed DOI PMC

Tihelka E., Li Y.-D., Huang D.-Y., Cai C.-Y. Are wounded-tree beetles living fossils? A new nosodendrid genus from Burmese amber with bilobed tarsi (Coleoptera: Nosodendridae) Palaeoentomology. 2021;4:50–56. doi: 10.11646/palaeoentomology.4.1.10. DOI

Schmidt J., Michalik P. The ground beetle genus Bembidion Latreille in Baltic amber: Review of preserved specimens and first 3D reconstruction of endophallic structures using X-ray microscopy (Coleoptera, Carabidae, Bembidiini) ZooKeys. 2017;662:101–126. doi: 10.3897/zookeys.662.12124. PubMed DOI PMC

Bukejs A., Bezděk J., Alekseev V.I., Kairišs K., McKellar R.C. Description of the male of fossil Calomicrus eocenicus Bukejs et Bezděk (Coleoptera: Chrysomelidae: Galerucinae) from Eocene Baltic amber using X-ray microtomography. Foss. Rec. 2020;23:105–115. doi: 10.5194/fr-23-105-2020. DOI

Kundrata R., Gimmel M.L., Packova G., Bukejs A., Blank S.M. A new enigmatic lineage of Dascillidae (Coleoptera: Elateriformia) from Eocene Baltic amber described using X-ray microtomography, with notes on Karumiinae morphology and classification. Foss. Rec. 2021;24:141–149. doi: 10.5194/fr-24-141-2021. DOI

Alekseev V.I., Bukejs A. The first extinct species of Acritus LeConte, 1853 (Histeridae: Abraeinae) from Eocene Baltic amber: A microscopic beetle inclusion studied with X-ray micro-computed tomography. Foss. Rec. 2021;24:223–231. doi: 10.5194/fr-24-223-2021. DOI

Ivie M.A. Ptilodactylidae Laporte 1836. In: Arnett R.H. Jr., Thomas M.C., Skelley P.E., Frank J.H., editors. American Beetles. Polyphaga: Scarabaeoidea through Curculionoidea. Volume 2. CRC Press; Boca Raton, FL, USA: 2002. pp. 1–861.

Lawrence J.F. Dascillidae Guérin-Méneville, 1843. In: Beutel R.G., Leschen R.A.B., editors. Handbook of Zoology, Coleoptera, Beetles, Morphology and Systematics (Archostemata, Adephaga, Myxophaga, Polyphaga partim) 2nd ed. Walter de Gruyter; Berlin, Germany: Boston, MA, USA: 2016. pp. 531–537.

Lawrence J.F. Ptilodactylidae (Dryopoidea) In: Stehr F.W., editor. Immature Insects. Volume 2. Kendall/Hunt Publishing; Dubuque, IA, USA: 1991. pp. 391–394.

Lawrence J.F., Stribling J.B. A new genus of Ptilodactylidae (Coleoptera: Elateriformia) from North Queensland, with description of the presumed larva. J. Austral. Entomol. Soc. 1992;31:19–27. doi: 10.1111/j.1440-6055.1992.tb00454.x. DOI

Shepard W.D., Sites R.W. Aquatic larvae of Eulichadidae and Ptilodactylidae (Coleoptera: Byrrhoidea) from Thailand, with description of the larva of Pseudocladotoma Pic. Coleopt. Bull. 2019;73:142–148. doi: 10.1649/0010-065X-73.1.142. DOI

Beutel R.G. Phylogenetic analysis of Elateriformia (Coleoptera: Polyphaga) based on larval characters. J. Zool. Syst. Evol. Res. 1995;33:145–171. doi: 10.1111/j.1439-0469.1995.tb00969.x. DOI

Lawrence J.F., Nikitsky N.B., Kirejtshuk A.G. Phylogenetic position of Decliniidae (Coleoptera: Scirtoidea) and comments on the classification of Elateriformia (sensu lato) In: Pakaluk J., Ślipiński S.A., editors. Biology, Phylogeny, and Classification of Coleoptera. Papers Celebrating the 80th Birthday of Roy A. Crowson. Volumes 1–2. Muzeum i Instytut Zoologii PAN; Warszawa, Poland: 1995. pp. 375–410.

Costa C., Vanin S.A., Ide S. Systematics and bionomics of Cneoglossidae with a cladistic analysis of Byrrhoidea sensu Lawrence & Newton (1995) (Coleoptera, Elateriformia) Arq. Zool. 1999;35:231–300.

Kundrata R., Jäch M.A., Bocak L. Molecular phylogeny of the Byrrhoidea–Buprestoidea complex (Coleoptera, Elateriformia) Zool. Scr. 2017;46:150–164. doi: 10.1111/zsc.12196. DOI

Crowson R.A. The Natural Classification of the Families of Coleoptera. Nathaniel Lloyd & Co.; London, UK: 1955. pp. 1–187.

Stribling J.B. Revision of Anchytarsus (Coleoptera: Dryopoidea) and a key to the New World genera of Ptilodactylidae. Ann. Entomol. Soc. Am. 1986;79:219–234. doi: 10.1093/aesa/79.1.219. DOI

Stribling J.B. Ph.D. Thesis. Ohio State University; Columbus, OH, USA: 1986. World Generic Revision of Ptilodactylidae (Coleoptera: Dryopoidea)

Lawrence J.F., Newton A.F. Families and subfamilies of Coleoptera (with selected genera, notes, references and data on family group names) In: Lawrence J.F., Pakaluk J.F., Ślipiński S.A., editors. Biology, Phylogeny, and Classification of Coleoptera. Museum i Instytut Zoologii PAN; Warzawa, Poland: 1995. pp. 779–1092.

Kundrata R., Ivie M.A., Bocak L. Podabrocephalus Pic is the morphologically modified lineage of Ptilodactylinae (Coleoptera: Elateriformia: Ptilodactylidae) Insect Syst. Evol. 2019;50:147–161. doi: 10.1163/1876312X-00002190. DOI

Pic M. Pars 58. Dascillidae, Helodidae, Eucinetidae. In: Schenkling S., editor. Coleopterorum Catalogus. W. Junk; Berlin, Germany: 1914. pp. 1–65.

ICZN (International Commission on Zoological Nomenclature) International Code of Zoological Nomenclature. 4th ed. The International Trust for Zoological Nomenclature; London, UK: 1999. pp. 1–305. PubMed PMC

Ivie M.A. The familial placement of the genus Singularodaemon Pic (Coleoptera: Ptilodactylidae, Dascilloidea, Melyridae: Dasytinae) Coleopt. Bull. 2002;56:236. doi: 10.1649/0010-065X(2002)056[0236:SN]2.0.CO;2. DOI

Kundrata R., Jäch M. Ptilodactyla crenatostriata Redtenbacher, 1868 (Coleoptera: Ptilodactylidae) transferred to Phytocerum Costa, Vanin, Lawrence & Ide, 2003 (Coleoptera: Cerophytidae) Zootaxa. 2017;4324:371–377.

Chatzimanolis S., Cashion M.E., Engel M.S., Falin Z.H. A new genus of Ptilodactylidae (Coleoptera: Byrrhoidea) in mid-Cretaceous amber from Myanmar (Burma) Geodiversitas. 2012;34:569–574. doi: 10.5252/g2012n3a6. DOI

Alekseev V.I., Jäch M.A. Electrolichas circumbalticus gen. et sp. nov. (Coleoptera: Byrrhoidea: Ptilodactylidae) from Baltic amber, the first anchytarsine toed-winged beetle described from Europe. Zootaxa. 2016;4136:593–599. doi: 10.11646/zootaxa.4136.3.10. PubMed DOI

Motschulsky M. Voyages: Lettres de M. de Motschulsky à M. Ménétriés. No. 4. Etudes Entomol. 1856;5:21–38.

Kirejtshuk A.G., Ponomarenko A.G., Kurochkin A.S., Alekseev A.V., Gratshev V.G., Solodovnikov A.V., Krell F.-T., Soriano C. The beetle (Coleoptera) fauna of the Insect Limestone (late Eocene), Isle of Wight, southern England. Earth Environ. Sci. Trans. R. Soc. Edinb. 2019;110:405–492. doi: 10.1017/S1755691018000865. DOI

Lewis D. The fight for control over virtual fossils. Nature. 2019;567:20–23. doi: 10.1038/d41586-019-00739-0. PubMed DOI

Bouchard P., Bousquet Y., Davies A.E., Alonso-Zarazaga M.A., Lawrence J.F., Lyal C.H.C., Newton A.F., Reid C.A.M., Schmitt M., Ślipiński A., et al. Family-group names in Coleoptera (Insecta) ZooKeys. 2011;88:1–972. PubMed PMC

Nakane T. Notes on some little-known beetles (Coleoptera) in Japan, 10. Kita-Kyûshû no Konchû Kokura. 1993;40:1–8.

Nakane T. The beetles collected by Drs. Keizo Kojima and Shingo Nakamura in Taiwan (Insecta, Coleoptera) 2. Misc. Rep. Hiwa Mus. Nat. Hist. 1996;34:129–140.

Satô M., Lawrence J., Lee C.-F. Description of a new species of Drupeus Lewis (Coleoptera: Ptilodactylidae), with a discussion of the systematic position of the genus based on larval, pupal, and adult characters. Insect Syst. Evol. 2005;36:371–394. doi: 10.1163/187631205788838546. DOI

Satô M. Family Ptilodactylidae Laporte, 1836. In: Löbl I., Smetana A., editors. Catalogue of Palaearctic Coleoptera. Scarabaeoidea—Scirtoidea—Dascilloidea—Buprestoidea—Byrrhoidea. Volume 3. Apollo Books; Stenstrup, Denmark: 2006. pp. 453–454.

Lawrence J.F., Ślipiński A. Lycomimus, a new genus of Australian Ptilodactylidae (Coleoptera: Byrrhoidea) Zootaxa. 2013;3702:71–78. doi: 10.11646/zootaxa.3702.1.4. PubMed DOI

Lawrence J.F., Ślipiński A. Lycomimodes, a new generic replacement name for preoccupied Lycomimus Lawrence and Slipinski, 2013 (Insecta: Coleoptera: Ptilodactylidae) non Melzer, 1931 (Insecta: Coleoptera: Cerambycidae) Zootaxa. 2013;3709:555. doi: 10.11646/zootaxa.3709.6.4. PubMed DOI

Yoshitomi H., Hayashi M. Revision of the genus Drupeus (Coleoptera, Ptilodactylidae, Cladotominae) Jpn. J. Syst. Ent. 2013;19:1–15.

Hwang S., Yoshitomi H. Revision of the genus Anchycteis (Coleoptera, Ptilodactylidae) from Japan. Elytra. 2014;4:249–260.

Yoshitomi H., Hájek J. A new species of the genus Drupeus (Coleoptera: Ptilodactylidae: Cladotominae) from China. Jpn. J. Syst. Ent. 2016;22:43–45.

López-Pérez S., Zurita-García M.L., Domínguez-León D.E., González-Ramírez M., Vega-Badillo V., Cifuentes-Ruiz P., Rodríguez-Mirón G.M. First report of the genus Cladotoma Westwood, 1837 (Coleoptera, Ptilodactylidae, Cladotominae) in Mexico. Check List. 2020;16:1469–1473. doi: 10.15560/16.6.1469. DOI

Hájek J. A new species of Drupeus Lewis from eastern China (Coleoptera: Ptilodactylidae: Cladotominae) Zootaxa. 2021;4996:183–188. doi: 10.11646/zootaxa.4996.1.10. PubMed DOI

Mann D.J. Ptilodactyla exotica Chapin, 1927 (Coleoptera: Ptilodactylidae: Ptilodactylinae) established breeding under glass in Britain, with a brief discussion on the family Ptilodactylidae. Entomol. Mon. Mag. 2006;142:67–79.

Hájek J. Ptilodactyla exotica (Coleoptera: Ptilodactylidae) nalezena v České republice. (Ptilodactyla exotica (Coleoptera: Ptilodactylidae) found in the Czech Republic) Klapalekiana. 2009;45:229–232.

Nardi G., Bocci M., Poggi R. Ptilodactyla exotica Chapin, 1927 in Italy (Coleoptera: Ptilodactylidae) Zootaxa. 2020;4861:63–70. doi: 10.11646/zootaxa.4861.1.4. PubMed DOI

Viñolas A., Miralles-Nuñez A., Necoechea A. Primeros datos sobre la presencia de Ptilodactyla exotica Chapin, 1927 en la Península Ibérica (Coleoptera, Ptilodactylidae) Rev. Gadit. Entomol. 2020;11:93–98.

Seyfullah L.J., Beimforde C., Dal Corso J., Perrichot V., Rikkinen J., Schmidt A.R. Production and preservation of resins—Past and present. Biol. Rev. 2018;93:1684–1714. doi: 10.1111/brv.12414. PubMed DOI

Bukejs A., Alekseev V.I., Pollock D.A. Waidelotinae, a new subfamily of Pyrochroidae (Coleoptera: Tenebrionoidea) from Baltic amber of the Sambian peninsula and the interpretation of Sambian amber stratigraphy, age and location. Zootaxa. 2019;4664:261–273. doi: 10.11646/zootaxa.4664.2.8. PubMed DOI

Kasiński J.R., Kramarska R., Słodkowska B., Sivkov V., Piwocki M. Paleocene and Eocene deposits on the eastern margin of the Gulf of Gdańsk (Yantarny P-1 borehole, Kaliningrad region, Russia) Geol. Q. 2020;64:29–53. doi: 10.7306/gq.1513. DOI

Sadowski E.-M., Seyfullah L.J., Schmidt A.R., Kunzmann L. Conifers of the ‘Baltic amber forest’ and their palaeoecological significance. Stapfia. 2017;106:1–73.

Sadowski E.-M., Schmidt A.R., Denk T. Staminate inflorescences with in situ pollen from Eocene Baltic amber reveal high diversity in Fagaceae (oak family) Willdenowia. 2020;50:405–517. doi: 10.3372/wi.50.50303. DOI

Kirejtshuk A.G., Ponomarenko A.G., Prokin A.A., Huali C., Nikolajev G.V., Dong R. Current knowledge on Mesozoic Coleoptera from Daohugou and Liaoning (Northeast China) Acta Geol. Sin. 2010;84:783–792. doi: 10.1111/j.1755-6724.2010.00253.x. DOI

Soriano C., Delclòs X., Ponomarenko A.G. Beetle associations (Insecta: Coleoptera) from the Barremian (Lower Cretaceous) of Spain. Alavesia. 2007;1:81–88.

Kirejtshuk A.G., Azar D. New taxa of beetles (Insecta, Coleoptera) from Lebanese amber with evolutionary and systematic comments. Alavesia. 2008;2:15–46.

Kirejtshuk A.G., Azar D. Current knowledge of Coleoptera (Insecta) from the Lower Cretaceous Lebanese amber and taxonomical notes for some Mesozoic groups. Terr. Arthropod Rev. 2013;6:103–143. doi: 10.1163/18749836-06021061. DOI

Larsson S.G. Baltic amber—A palaeobiological study. Entomonograph. 1978;1:1–192.

Weitschat W., Wichard W. Baltic Amber. In: Penney D., editor. Biodiversity of Fossils in Amber from the Major World Deposits. Siri Scientific Press; Manchester, UK: 2010. pp. 80–115.

Langenheim J.H. Plant Resins: Chemistry, Evolution, Ecology, and Ethnobotany. Timber Press; Portland, OR, USA: 2003. pp. 1–612.

Wolfe A.P., Tappert R., Muehlenbachs K., Boudreau M., McKellar R.C., Basinger J.F., Garrett A. A new proposal concerning the botanical origin of Baltic amber. Proc. R. Soc. B. 2009;276:3403–3412. doi: 10.1098/rspb.2009.0806. PubMed DOI PMC

Alekseev V.I. The beetles (Insecta: Coleoptera) of Baltic amber: The checklist of described species and preliminary analysis of biodiversity. Zool. Ecol. 2013;23:5–12. doi: 10.1080/21658005.2013.769717. DOI

Perkovsky E.E., Rasnitsyn A.P., Vlaskin A.P., Taraschuk M.V. A comparative analysis of the Baltic and Rovno amber arthropod faunas: Representative samples. Afr. Invertebr. 2007;48:229–245.

Spahr U. Systematischer Katalog der Bernstein-und Kopal-Käfer (Coleoptera). Systematic catalogue of Coleoptera in amber and copal. Stuttg. Beitr. Naturkd. Ser. B. 1981;80:1–107.

Carpenter F.M. Superclass Hexapoda. In: Kaesler R.D., editor. Treatise on Invertebrate Paleontology. Volume 3/4. Geological Society of America; Boulder, CO, USA: University of Kansas; Lawrence, KS, USA: 1992. pp. 279–655. Part R, Arthropoda 4.