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Download This PDF File Acta Geologica Polonica , Vol. 59 (2009), No. 1, pp. 39 –44 A second camel spider (Arachnida: Solifugae) from Baltic amber JASON A. DUNLOP 1 AND ANJA E. KLANN 2 1Museum für Naturkunde, Leibniz Institute for Research on Evolution and Biodiversity at the Humboldt University Berlin, Invalidenstrasse 43, D-10115 Berlin, Germany. E-mail: [email protected] 2Ernst-Moritz-Arndt-University Greifswald, Zoological Institute & Museum, Johann-Sebastian-Bach-Straße 11/12 , 17489 Greifswald, Germany. E-mail: [email protected] ABSTRACT: Dunlop, J.A. and Klann, A.E. 200 9. A second camel spider from Baltic amber. Acta Geologica Polonica , 59 (1), 39 –44 . Warszawa. Fossil camel spiders (Arachnida: Solifugae) are extremely rare and only the second example ever recovered from Baltic amber (Paleogene: Eocene) is described here. Although superficially well preserved and more than twice the size of the previously known Baltic amber specimen, key taxonomic characters allowing meaningful com - parisons to the other fossil and living material cannot, unfortunately, be resolved. It is formally treated here as Solifugae gen. et sp. indet., although we concede that it could be an adult of the previously recorded Baltic am - ber species Palaeoblossia groehni Dunlop, Wunderlich and Poinar, 2004. Key words: Arachnida; Solifugae; Eocene. INTRODUCTION Marer 1972). They are typically extremely setose (Text- figs 1–2) and these long setae might be important sen - Camel spiders (Solifugae) are a distinctive group of sory organs with a tactile function, but this remains to arachnids which tend to be associated today with arid be investigated (Roewer 1934). Unique autapomor - habitats – hence their common name. They are also phies of the group include a series of further sensory or - known as sun spiders or wind scorpions, the latter re - gans on the ventral side of the coxae and trochanters of lating to the speed at which they can run. The catalogue the fourth pair of walking legs called malleoli (or rac - of Harvey (2003) documented 1,075 extant species, quet organs) and a modified male flagellum on the placed in 140 genera and 12 families. These occur chelicerae; the shape of which is usually of considerable world-wide in the mostly arid regions of the subtrop - taxonomic importance. The pedipalps are leg-like, but ics to the tropics, including also Central Asia and the usually quite robust and end in a further unique char - Mediterranean region; although they are curiously ab - acter for the group in the form of a suctorial organ sent from Australia. Camel spiders are voracious pred - (Cushing et al . 2005; Klann et al . 2008). A summary of ators with large, two-segmented jaws (chelicerae) in camel spider biology can be found in Punzo (1998). proportion to the rest of the body. They feed mainly on Fossil camel spiders are extremely rare. An enig - small arthropods, but occasionally also on small verte - matic find from the Early Carboniferous of Poland re - brates (e.g. Cloudsley-Thompson 1977 ; Banta and veals some characters consistent with Solifugae or at 40 JASON A. DUNLOP AND ANJA E. KLANN Text-fig. 1. A near complete camel spider (Arachnida: Solifugae incertae sedis ) preserved in Baltic Amber (Paleogene, Eocene) held in the Muzeum Bursztyn, Gdańsk, Poland. Scale bar equals 2 mm CAMEL SPIDER FROM BALTIC AMBER 41 least their putative stem-lineage (Dunlop and Rößler recognised as belonging to Solifugae and cannot be as - 2003). The oldest unequivocal camel spider comes from signed to any particular higher taxon. There then follows the Late Carboniferous Coal Measures of Mazon Creek, a considerable hiatus until the Early Cretaceous. Camel USA. Preserved only in outline, it was redescribed by spiders assignable to the modern African family Cero - Selden and Shear (1996) who noted that it can barely be midae have been recovered from the Crato Formation of Text-fig. 2. Interpretative camera lucida drawing of the specimen shown in Text-fig . 1 42 JASON A. DUNLOP AND ANJA E. KLANN Brazil (Selden and Shear 1996; Dunlop and Martill 1.9 mm, basal width 1.2 mm. Chelicerae highly setose 2004). They reveal that ceromids originally had a more with long putative tactile setae (some over 2 mm) in - widespread, i.e. Gondwanan, distribution. terspersed with numerous shorter setae. Each che - Two camel spiders have been recorded from Ceno - licera with putative flagellum in the form of a single, zoic ambers. Dominican Republic amber (Neogene: probably backwards-pointing rod or spine, at least 0.8 Miocene) has yielded one species (Poinar and Santiago- mm long, originating near the anterior cheliceral tip Blay 1989) assignable to the modern family Am - and lying mesally along the inner face of the chelicera motrechidae. This makes biogeographical sense, since with a slight curvature. No further ornament visible, ammotrechids occur only in the Americas today (Punzo but details of this flagellar structure equivocal. 1998; Harvey 2003). The second find comes from Baltic Propeltidium of carapace trapezoidal. Wider anteri - amber (Dunlop et al . 2004) and was assigned to the orly, maximum width 2.6 mm, and slightly procurved family Daesiidae. This family has quite a widespread dis - across this anterior margin. Right side hints at the pres - tribution today, being found in Africa, southern Europe, ence of exterior lobes, but these are not strongly pro - the near East and South America. The Baltic amber nounced. Anterior margin also bears paired median eyes camel spider was tentatively raised to a new genus and on a single, oval ocular tubercle, width 0.6 mm. Poste - treated as a possible adult or subadult male. Its very small rior margin of carapace straight, width 1.9 mm, but size (if adult) was also noted. Here, we describe only the with a distinct fold (?the arcus anterior) along this pos - second specimen of a camel spider from Baltic amber. terior margin. Propeltidium length 2.2 mm, with faint This could turn out to be the true adult of the previous median sulcus originating immediately behind the oc - Baltic amber species, but insufficient details are pre - ular tubercle. Propeltidium highly setose with longer se - served to allow a formal taxonomic assignment. tae interspersed with coating of short setae; those im - mediately behind the ocular tubercle directed inwards towards the midline. Meso- and metapeltidium equivo - MATERIAL AND METHODS cal, but folded arthrodial membrane immediately behind propeltidium can be resolved and behind this numerous The specimen described here is held in the Muzeum setae. Details of opisthosoma largely lacking, but two Bursztyn [Museum of Amber], Targ Węglowy Str., 80- anterior tergites preserved. Both bear numerous short se - 831 Gdańsk, Poland. It was photographed using a Le - tae and groups of longer, stouter setae localized into ica Systems camera arrangement attached to a stere - paired patches either side of the midline. Lateral margins omicroscope, which generates a series of images of opisthosoma also bear numerous long tactile setae, at through the specimen at different focal planes. The c. 80 least one of which approaches 5 mm in length. individual images were combined into a final compos - Pedipalps robust, length c. 7.6 mm; proximal articles ite using the software package Auto Montage ©. The largely equivocal, but more distal ones with measurable specimen was drawn using a Leica MZ12 stereomicro - lengths of 2.3 (patella), 2.1 (tibia), and 1.0 mm (tarsus). scope with a camera lucida attachment. Amber is diffi - Pedipalps highly setose with numerous tactile setae, cult to date precisely, but Baltic amber is usually treated typically over 2 mm long, interspersed with other shorter as being of Paleogene (Eocene) age, or c. 45–50 Ma. and more slender setae. Tibia of pedipalp bears short, stout, inward facing spines perpendicular to the long axis of the article. Palpal organ equivocal. Legs relatively SYSTEMATIC PALAEONTOLOGY slender, particularly leg I, but leg series incomplete and all preserved legs only known from proximal articles. Order Solifugae Sundevall, 1833 All legs highly setose with some individual, putative tac - Solifugae gen. et sp. indet. tile setae approaching 3 mm. Leg IV femur with three prominent tactile setae forming a dorsal row. Distal leg MATERIAL: Muzeum Bursztyn, Gdańsk, Poland (ex articles and any division of the tarsi equivocal. Jonas Damzen collection). REMARKS: A precise systematic placement of this HORIZON AND LOCALITY: Paleogene (Eocene) fossil is hindered by the absence of a clear view of those Baltic amber; precise locality uncertain. morphological characters important for assignment to a family. Drawing on identification keys for Recent DESCRIPTION: Relatively complete specimen visible camel spiders, essential features include the position in dorsal view only. Total body length c. 12 mm. Che - (terminal or ventral) of the anus, the number of tarsal licerae robust, subtriangular, tapering anteriorly; length segments, fossorial or cursorial legs, micro-setae on the CAMEL SPIDER FROM BALTIC AMBER 43 leg claws, claws present or absent on leg I, presence or Daesiidae, to which the other known fossil so - absence of ctenidia on opisthosomal segment IV, shape lifuge from Baltic amber is assigned (Dunlop et al . and motility of the male flagellum and presence or ab - 2004), is extremely wide-spread and occurs in Africa, sence of pairs of ventrolateral spines on the pedipalps southern Europe, the Near East and apparently in (cf. Roewer 1934; Harvey 2003). Muma ( 1976 ) estab - South America (with three monotypic genera; see Har - lished a familial system based partly on characters pre - vey 2003). Karschiidae are also known from various viously used by Roewer, but Muma’s system primarily geographical regions such as Asia, the Near East, includes male secondary sexual characters supported by southeast Europe, and northwest Africa. Both families cheliceral dentition and the female opercula. include rather small representatives. However, it has to Some solifuge characters are family-specific.
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