Britto, Erika P. J.Lindquist, Evert E. [AuthorE-mail: lindquiste@agr.gc.ca]De Moraes, Gilberto J. [Author...
15页
查看更多>>摘要：A redescription of Lasioseius floridensis Berlese, 1916 is presented based on examination with descriptive notes of primary type material in the Berlese Collection and on a study of specimens collected from gerbera leaves in Mogi das Cruzes, State of Sao Paulo, Brazil representing all postembryonic stages. This species was originally described from Lake City, Florida, USA, where it was collected from moss; it is considered a senior synonym of Lasioseius arboreus Chant, 1963 (new synonymy) and Lasioseius fimetorum Karg, 1971 (new synonymy), based on examination of primary type material of the latter two species. Examination of other primary type material also indicated that Lasioseius sugawarai Ehara, 1964 is a senior synonym of Lasioseius tridentatus Baker, Delfinado & Abbatiello, 1976 (new synonymy). Placement of L. floridensis among other of the ca 150 species of Lasioseius, based on available keys, and the need for more detailed descriptions of species of genera such as Lasioseius, confirmed by examination of their primary type material, are discussed.
查看更多>>摘要：The male of Systaria cervina (Simon, 1897) is newly described; the female internal genitalia are illustrated for the first time. Seven new species are described from Southeast Asia: S. decidua sp. nov. and S. lanna sp. nov. from northern Thailand; S. insolita sp. nov. from northeastern Thailand; S. bifida sp. nov. from southern Thailand and Myanmar; S. acuminata sp. nov. from southern Thailand and Indonesia; S. convolutiva sp. nov. from Indonesia; S. deelemanae sp. nov. from the Philippines. Two additional characters are recognized among Systaria species and considered synapomorphies for the genus: the base of the cymbium on retrolateral side is provided with a sharply pointed cymbial tubercle or an elevated, oblique ridge; the anterior bursae of the internal female genitalia are distinctly sclerotized.
Shimada, TomohikoMatsui, MasafumiYambun, PaulSudin, Ahmad ....
24页
查看更多>>摘要：Previous analyses of molecular and larval morphology have suggested that Meristogenys amoropalamus is composed of two cryptic species, but no diagnostic characters of their adult morphology have been reported. Here, we compared adult characters of these two species and found that they differed in iris colour (yellowish-green and sandy brown), tympanum size and relative limb length. Based on the results of analysis of DNA sequences of the type specimens and a discriminant analysis using 18 morphological variables, we conclude that the lineage with green irises is the true M. amoropalamus, and that the lineage with sandy brown irises is a new species, M. dyscritus sp. nov. In northern Sabah, M. dyscritus is distributed in altitudes lower than those of M. amoropalamus, but the distributional ranges of their larvae overlap in some streams. Meristogenys amoropalamus has larger and lighter-coloured ova, smaller clutch sizes and a more interstitial larval life than M. dyscritus. These differences suggest that M. amoropalamus has a more cryptic life during its larval period than M. dyscritus.
Frydova, Barbora [AuthorFryda, JiriBlodgett, Robert B. [AuthorE-mail: robertbblodgett@yahoo.com]...
6页
查看更多>>摘要：The Tryblidia (= Monoplacophora) represents the conchiferan class with the fewest Recent taxa in the phylum Mollusca (Haszprunar 2008) and its phylogeny is still poorly known. This group is known already in Cambrian strata (Early Paleozoic) more than 500 Ma ago. Present-day tryblidian species are known mainly from hadal environments (Schwabe 2008, but see also Wilson et al. 2009) in contrast to Paleozoic species, which have been described only from shallow environments of continental shelves of many paleocontinents (e. g., Horny 1962). A typical feature of fossil as well as living tryblidian species is their rarity. The vast majority of species are known only from several specimens (Haszprunar 2008). Furthermore, description of Paleozoic tryblidian molluscs is strongly underrepresented in the literature, despite the existence of diverse material. This is also true for fossils described in the present study based on a diverse silicified molluscan fauna of mostly gastropods collected from Lower Devonian strata of the Royal Creek area, Yukon Territory (Fig. 1) by Alfred C. Lenz and David G. Perry from 1970-1980. Lists of all hitherto described molluscan species as well as detailed information on their age and locality can be found in Lenz (1977a), Blodgett et al. (2001, 2010) and Fryda et al. (2008). Prior to our studies of the Royal Creek tryblidian and gastropod fauna, no descriptions or illustrations were available for Lower Devonian molluscs of north-western Canada, although a short discussion and faunal lists were provided by Blodgett et al. (1988) for Lower Devonian tryblidians and gastropods from the relatively nearby Delorme Formation of Northwest Territories, and early Emsian (late Early Devonian) tryblidians and gastropods from the Mt. Lloyd George area, northeastern British Columbia. The poor knowledge of Paleozoic tryblidians and gastropods faunas of Laurentia (North America) caused difficulties in the evaluation of Early Devonian paleobiogeography (Blodgett et al. 1999). The present paper is focused on the taxonomy of a new Devonian tryblidian limpet, but it provides also useful data for paleobiogeography and biostratigraphy of the Lower Devonian of western Canada.Molluscan shells from middle Early Devonian (Pragian) strata of the Royal Creek area (Yukon Territory, Canada) are silicified and were extracted by hydrochloric acid from limestone samples at the Department of Geology, University of Western Ontario, London (Ontario, Canada) beginning 45 years ago. The specimens (holotype and paratype) described in this paper are deposited in the National Type Collection of Invertebrate and Plant Fossils of the Geological Survey of Canada, Ottawa, Canada K1A 0E8 (GSC 134793-134794).
Bernal, Moises A.Rocha, Luiz A. [AuthorE-mail: rocha@mail.utexas.edu].
6页
查看更多>>摘要：The ocean surgeonfish, Acanthurus bahianus, has been historically recorded from Bermuda and Massachusetts to southern Brazil and the islands of the central Atlantic. We have found that individuals in the southwestern and central Atlantic consistently have a posterior bright yellow margin on the caudal fin and an orange/red margin on the dorsal fin. This coloration is different from the characteristic white/blue fin margins on individuals from the northwestern Atlantic. In addition, there is a clear genetic distinction (d= 2.4% mtDNA, CytB) between these two lineages. With the corroborating coloration and genetic differences, we suggest that these two lineages represent distinct species. The South Atlantic species retains the name of A. bahianus and we propose to resurrect A. tractus (Poey 1860) as the valid name for the northwestern Atlantic species.
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