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An Aquatic Water Scavenger Beetle in Early Miocene Amber from the Dominican Republic (Coleoptera: Hydrophilidae)

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An Aquatic Water Scavenger Beetle in Early Miocene Amber from the Dominican Republic (Coleoptera: Hydrophilidae) A N N A L E S Z O O L O G I C I (Warszawa), 2011, 61(4): 621-628 AN AQUATIC WATER SCAVENGER BEETLE IN EARLY MIOCENE AMBER FROM THE DOMINICAN REPUBLIC (COLEOPTERA: HYDROPHILIDAE) MARTIN FIKÁČEK1, 2 and MICHAEL S. ENGEL3, 4 1Department of Entomology, National Museum, Kunratice 1, CZ-148 00 Praha 4, Czech Republic 2Department of Zoology, Faculty of Science, Charles University in Prague, Viničná 7, CZ-128 44 Praha 2, Czech Republic; e-mail. [email protected] 3Division of Entomology (Paleoentomology), Natural History Museum, and Department of Ecology & Evolutionary Biology, 1501 Crestline Drive – Suite 140, University of Kansas, Lawrence, KS 66049-2811, USA; e-mail: [email protected] 4Division of Invertebrate Zoology (Entomology), American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024-5192, USA Abstract.— We describe a fossil hydrophilid beetle Anacaena paleodominica sp. nov. from the Early Miocene amber of the Dominican Republic, which is the only definitive amber inclusion of the family Hydrophilidae documented. The species belongs to the Recent Anacaena suturalis species group known from the Nearctic, Neotropical, and Australian regions. The fossil demonstrates that representatives of the species group may already have been widespread and common by the Early Miocene, and indicates a possible Miocene/post-Miocene extinction of the aquatic insect fauna on the island of Hispaniola. Key words.— Dominican amber, Coleoptera, Hydrophilidae, Anacaena, island, extinction. INTRODUCTION merely been listed without further details from Baltic, Dominican, Mexican and Bitterfeld ambers (see The beetle family Hydrophilidae comprises 3335 Table 1 for references), and are also infrequently Recent species distributed world-wide (Hansen 1999, identified as such in various collections. Unfortunately, Short & Fikáček 2011) and inhabiting a wide spectrum a portion of these records seem to be based on mis- of habitats from truly aquatic through semiaquatic and identifications with other families of small body size hygropetric to completely terrestrial. Especially the and semiglobular appearance and hydrophilids seem aquatic taxa are rather frequent in the fossil record – therefore to be really quite rare as amber inclusions. ca. 150 fossil hydrophilid species are described At present, we are only aware of three specimens (Fikáček, unpubl data.), even though the ongoing revi- from Baltic amber (Komarek, personal communication; sion of fossil hydrophilids reveals a rather high per- Fikáček et al., in prep.) and of a single specimen centage of misidentified taxa (e.g., Fikáček et al. 2010, from Dominical amber. The Dominican specimen is 2011). studied in detail herein – it is perhaps the same speci- Suprisingly, all data concerning fossil hydrophilid men referred to by Poinar & Poinar (1999), or at the beetles has been based on compression fossils and no very least is the same species from which their record amber inclusions have hitherto been described in of the genus Anacaena in Dominican amber was detail. Amber inclusions of hydrophilid beetles have derived. PL ISSN 0003-4541 © Fundacja Natura optima dux doi: 10.3161/000345411X622462 ˆ 622 M. FIKÁCEK & M. S. ENGEL MATERIAL AND METHODS anteriorly. Antennae with nine antennomeres, anten- nomere IX elongate, slightly longer than wide. Maxil- The fossil specimen was examined using an Olym- lary palpus short and stout, palpomere II longest, pus SZX16 binocular microscope. Photographs were strongly swollen distally, palpomere III short, palpo- taken either using a Nikon D1x digital camera attached mere IV indistinctly shorter than palpomere II. Mentum to an Infinity K-2 long-distance microscope lens or a transverse. Tentorial pits distinct, minute, gular suture Nikon Coolpix P6000 camera attached to the aforemen- diverging posteriad. tioned Olympus microscope. As it is impossible to see Thorax. Anterior and posterior corners of prono- all preserved details of the specimen in one view, each tum rounded, pronotal punctation fine and sparse. drawing includes those characters observable when Prosternum ecarinate medially, lateral aperture of pro- the specimen is examined in several positions and from coxa open but very narrow. Mesoscutellar shield small, different lightings. triangular. Elytron with very distinct sutural stria in The comparison with modern specimens is based posterior two-thirds; elytral punctation coarse, consist- on material deposited in the collection of the Division of ing of punctures much coarser and more densely Entomology, University of Kansas Natural History arranged than on pronotum; all punctures of same size, Museum, Lawrence, USA and the entomological collec- some of them arranged in irregular series, punctation tion of the National Museum, Prague, Czech Republic. between these series irregular. Epipleuron wide anteri- Morphological terminology follows Komarek (2004), orly, strongly narrowing towards level of metacoxae. and diagnostic characters for Neotropical Anacaena Metaventrite flat. are adopted from the taxonomic revision of Recent Legs. Procoxae globular, each bearing several species undertaken by Komarek (2005). spines ventrally; profemur with distinct tibial groove, densely pubescent on dorsal surface; protibia with stout spines along lateral surface and on apex; protar- TAXONOMY sus with five tarsomeres, protarsomeres I–IV subequal in legth, protarsomere V longest. Mesofemur denselly Order Coleoptera Linnaeus, 1758 pubescent on ventral surface; mesotibia with long Family Hydrophilidae Latreille, 1802 spines along lateral surface and on apex; mesotarsus with mesobasitarsomere shortest, mesotarsomere II Anacaena paleodominica sp. nov. longest and subequal to mesotarsomeres III–V com- Figs. 1–7 bined. Metafemur with dense pubescence restricted to basolateral portion only; metatibia with several long Type locality and age. Dominican amber (Domi- spines distally; metatarsus about as long as metatibia, nican Republic, Early Miocene [Burdigalian] in age, ca. metabasitarsomere shortest, metatarsomere II longest, 19 Ma). The age of Dominican amber has been con- metatarsomeres III–V subequal in length. Meso- and fused in the literature with ages ranging from the metatarsus bearing swimming hairs. Pretarsal claws Eocene to the Miocene. Current evidence supports an small, arcuate. Early Miocene origin for Dominican amber (e.g., Itur- Abdomen with five visible ventrites, ventrite I ecar- ralde-Vinent, 2001; Iturralde-Vinent & MacPhee, 1996, inate medially. Sternite VIII with sparsely arranged 1999; Grimaldi & Engel, 2005; Penney 2010), an age long setae on posterior margin. Aedeagus with pointed that correlates well with the more modern character of parameral apices. the included fauna relative to truly Paleogene deposits Generic placement. The new species may be (e.g., Grimaldi 1995; Engel 2001; Penney 2010). assigned to the hydrophilid genus Anacaena on the Type material. Holotype: AMNH DR-10-778 (piece basis of the following characters: (1) body weakly con- of amber containing the hydrophilid specimen vex, elongate oval; (2) antenna with loosely-segmented described herein and also some additional specimens antennal club; (2) prosternum ecarinate; (3) hypo- of Diptera). Deposited in the American Museum of Nat- meron without defined antennal grooves; (4) procoxae ural History, New York. contiguous; (5) all femora bearing dense hydrophobic Description. Body length 1.4 mm, body width ca. pubescence; (6) abdomen with five ventrites; (7) ely- 0.8 mm, length/width ratio ca. 1.7. Head dark brown, tron with deeply impressed sutural stria, but without darker than pronotum, with very inconspicuous paler other longitudinal striae. By the general habitus and preocular patches; pronotum dark brown medially, small body size, the fossil also resembles the hydro- becoming gradually paler laterad, lateral portions philid genera Notionotus and Paracymus (both largely pale reddish brown; elytra dark brown except occurring in the Neotropical region), but may be distin- for slightly paler sutural interval. guished from them as follows: Notionotus differs by Head. Compound eyes rather large in dorsal the absence of the sutural stria on the elytron, while view, indistinctly protruding laterad, not emarginate Paracymus differs in at least a partly carinate AN AQUATIC WATER SCAVENGER BEETLE IN EARLY MIOCENE AMBER FROM THE DOMINICAN REPUBLIC 623 Table 1. List of published records of the Hydrophiloidea preserved as amber and copal inclusions (only primary references included). Reference Original identification Comments Baltic amber (middle Eocene) Motschulsky (1856) small hydrophilids The record is based on the collection of Prof. F. A. Menge from Gdansk´ (Poland), and was incorrectly interpreted as a record of the genus Hydrophilus by Spahr (1981). Klebs (1910) ? Cercyon sp. Klebs’ collection was later included into the collection of the Königsberg Museum (today Kaliningrad) which was destroyed during World War II. A small part survives today in the University in Göttingen (see Ritzkowski 1990 below) and singletons are possibly present in several other museums (some seen in the Museum of Comparative Zoology at Harvard University, some should be in the Natural History Museum in London). Williamson (1932) Hydrophilidae, List of families is based on the Klebs' compilation of the insects deposited Georissidae at that time in the collection of the Königsberg Museum which was mostly destroyed during World War II (see also the notes by Klebs (1910) and Ritzkowski (1990)). Bachofen-Echt
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