A taxonomic assessment of the type series of Albertosaurus sarcophagus and the identity of Tyrannosauridae (Dinosauria, Coelurosauria) in the Albertosaurus bonebed from the Horseshoe Canyon Formation (Campanian–Maastrichtian, Late Cretaceous)This article is one of a series of papers published in this Special Issue on the theme Albertosaurus.

2010 ◽  
Vol 47 (9) ◽  
pp. 1213-1226 ◽  
Author(s):  
Thomas D. Carr
Keyword(s):  
Late Cretaceous ◽  
Type Specimen ◽  
Special Issue ◽  
Diagnostic Characters ◽  
Type Series ◽  
Growth Changes ◽  
Horseshoe Canyon Formation

The type series of Albertosaurus sarcophagus , consisting of a type (CMN 5600) and a paratype (CMN 5601) is inadequately established, since it has not been demonstrated that the specimens represent the same taxon. This problem has arisen because the original diagnostic characters have a wider distribution among Tyrannosauridae or they are in error, and both specimens consist of incomplete and damaged skulls. The type series was studied to test for the presence of diagnostic characters in the type specimen and, if so, to provide a rationale for referring the paratype to the taxon. Of the bones shared between the skulls, only five could be compared. One character, the enlarged posterior pneumatic recess of the palatine, is shared between the two specimens; this condition differs from the situation seen in other tyrannosaurids. This character provided the rationale for assessing the identity of the specimens collected from the Albertosaurus bonebed, from which one palatine was collected that exhibits the diagnostic recess. Isolated cranial bones from the bonebed were compared with those preserved in the type series to evaluate their referral to A. sarcophagus ; additional characters shared between the type series and the specimens from the bonebed were identified in the maxilla, lacrimal, and palatine. This evidence supports the hypothesis that A. sarcophagus is the tyrannosaurid preserved in the bonebed. A hypothesis of the principal growth changes in the skull in A. sarcophagus, which includes the type series and bonebed material, is proposed.

scholarly journals On the identity of Colletes neoqueenensis (Colletidae: Colletinae) from southern South America

2019 ◽  
pp. 1-8 ◽  
Author(s):  
Rafael Rodrigues Ferrari
Keyword(s):  
South America ◽  
Rare Species ◽  
Type Specimen ◽  
Museum Specimens ◽  
High Quality ◽  
Southern South America ◽  
Diagnostic Characters ◽  
Type Series

Colletes neoqueenensis Friese, 1910 is a rare species from southern Argentina known to me from its type series only. The species has also been recorded from Chile, but its occurrence in that country remains to be confirmed. Examination of some museum specimens misidentified as C. neoqueenensis indicates that bee taxonomists are often unaware of its actual identity. To clarify this, I provide a series of diagnostic characters as well as a detailed redescription of the female lectotype. High quality photographs of the type specimen are also given so the species can be more easily identified.

scholarly journals A preliminary review of the fossil species of Ranina Lamarck, 1801 (Decapoda, Brachyura, Raninidae), with systematic remarks

2017 ◽  
Vol 4 (1) ◽  
pp. 43
Author(s):  
Giovanni Pasini ◽  
Alessandro Garassino
Keyword(s):  
Type Species ◽  
Preliminary Review ◽  
Fossil Species ◽  
Diagnostic Characters ◽  
Type Series ◽  
Nomina Dubia ◽  
Doubtful Species

The systematics of the fossil representatives of Ranina Lamark, 1810, has been discussed by several authors in the last century, showing some problematics above all due to the lack of a close diagnosis of the type species (<em>R. ranina</em>) and to the scarce number of well-preserved type series of each fossil species. However, based upon a close comparison among the type series of each species, authors’ original descriptions, and the main diagnostic characters of <em>Ranina</em>, this preliminary review finds that twelve species have to be considered as doubtful species within <em>Ranina</em>, as follows: <em>?Ranina americana</em> Withers, 1924, <em>?R. berglundi</em> Squires &amp; Demetrion, 1992,<em> ?R. bouilleana</em> A. Milne Edwards, 1872, <em>?R. brevispina</em> Lőrenthey, 1898,<em> ?R. granulosa</em> A. Milne Edwards, 1872, <em>?R. griesbachi</em> Noetling, 1897, <em>?R. haszlinskyi</em> Reuss, 1859, <em>?R. libyca</em> (Van Straelen, 1935),<em> ?R.</em> <em>molengraaffi</em> Van Straelen, 1924,<em> ?R. oblonga</em> (von Münster, 1840), <em>?R. ornata</em> De Angeli &amp; Beschin, 2011, and<em> ?R. speciosa</em> (von Münster, 1840). Four species have to be considered as <em>Ranina nomina dubia</em>, as follows: <em>Ranina elegans</em> Rathbun, 1945, <em>R. hirsuta</em> (Schafhäutl, 1863), <em>R. lamiensis</em> Rathbun, 1945, and<em> R. tejoniana</em> Rathbun, 1926. <em>Ranina</em> <em>bavarica</em> Ebert, 1887,<em> R. fabri</em> Schafhäutl, 1863, and<em> R. helii</em> Schafhäutl, 1863, have to be assigned to Lophoranina Fabiani, 1910. <em>Ranina</em> <em>cuspidata</em> Guppy, 1909, has to be assigned to Calappa Weber, 1795 (Calappidae De Haan, 1833). Finally,<em> R. burleighensis</em> Holland in Holland &amp; Cvancara, 1958, has to be considered as doubtful species within Decapoda.

A history of Albertosaurus discoveries in Alberta, CanadaThis article is one of a series of papers published in this Special Issue on the theme Albertosaurus.

2010 ◽  
Vol 47 (9) ◽  
pp. 1197-1211 ◽  
Author(s):  
Darren H. Tanke ◽  
Philip J. Currie
Keyword(s):  
New Genus ◽  
Geographic Range ◽  
Special Issue ◽  
Southern Alberta ◽  
Considerable Confusion ◽  
Taxonomic Uncertainty ◽  
History Of ◽  
Information Politics ◽  
Horseshoe Canyon Formation

After many years of taxonomic uncertainty, Albertosaurus was established as a new genus in 1905, the year Alberta became a province of Canada. Gorgosaurus is a closely related tyrannosaurid from the Judithian beds of southern Alberta that was subsequently synonymized with Albertosaurus. Although most researchers consider the genera as distinct, there has been considerable confusion over the temporal and geographic range of Albertosaurus. Albertosaurus sarcophagus is only known from 13 skulls and (or) skeletons of varying completeness, and one (possibly two) bonebeds, all from the Horseshoe Canyon Formation (Campanian–Maastrichtian) of Alberta. Many of the major Albertosaurus specimens are scientifically compromised due to poor collection techniques, incomplete locality and stratigraphic information, politics, vandalism, accidents, gunplay, and landowner issues. The background of each specimen is discussed to eliminate some of the sources of confusion and to document how much of each specimen is preserved.

scholarly journals Transitional evolutionary forms in chasmosaurine ceratopsid dinosaurs: evidence from the Campanian of New Mexico

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e9251
Author(s):  
Denver W. Fowler ◽  
Elizabeth A. Freedman Fowler
Keyword(s):  
New Mexico ◽  
Phylogenetic Relationship ◽  
Late Cretaceous ◽  
Phylogenetic Hypothesis ◽  
Stepwise Change ◽  
Horseshoe Canyon Formation

Three new chasmosaurines from the Kirtland Formation (~75.0–73.4 Ma), New Mexico, form morphological and stratigraphic intermediates between Pentaceratops (~74.7–75 Ma, Fruitland Formation, New Mexico) and Anchiceratops (~72–71 Ma, Horseshoe Canyon Formation, Alberta). The new specimens exhibit gradual enclosure of the parietal embayment that characterizes Pentaceratops, providing support for the phylogenetic hypothesis that Pentaceratops and Anchiceratops are closely related. This stepwise change of morphologic characters observed in chasmosaurine taxa that do not overlap stratigraphically is supportive of evolution by anagenesis. Recently published hypotheses that place Pentaceratops and Anchiceratops into separate clades are not supported. This phylogenetic relationship demonstrates unrestricted movement of large-bodied taxa between hitherto purported northern and southern provinces in the late Campanian, weakening support for the hypothesis of extreme faunal provincialism in the Late Cretaceous Western Interior.

CIRCULAR OR SPHERICAL VESSELS IN THE FOSSIL RECORD

IAWA Journal ◽  
2015 ◽  
Vol 36 (2) ◽  
pp. 152-157 ◽  
Author(s):  
Pieter Baas ◽  
Rashmi Srivastava ◽  
Steven R. Manchester ◽  
Elisabeth A. Wheeler
Keyword(s):  
Late Cretaceous ◽  
Fossil Record ◽  
Central India ◽  
Type Specimen ◽  
Axillary Buds ◽  
Before Present ◽  
Early Paleocene

Strangely configured vessels composed of few elements interconnected in a sphere- or ring-like structure are reported from the type specimen of Amooroxylon deccanensis Bande & Prakash, a large fossil trunk from the Deccan Intertrappean Beds of central India (late Cretaceous-early Paleocene, about 66 MY before present). In the recent flora, circular vessels have been found mainly in association with branching nodes, axillary buds, wound callus, and pathogens, and they have been artificially induced by auxin. The presence of circular vessels in this fossil trunk showing no signs of branching or trauma makes this record highly unusual.

scholarly journals Redescription of the Amazonian tiny tree toad Amazophrynella minuta (Melin, 1941) (Anura: Bufonidae) from its type locality

Zootaxa ◽  
2018 ◽  
Vol 4482 (3) ◽  
pp. 511 ◽  
Author(s):  
ROMMEL R. ROJAS ◽  
ANTOINE FOUQUET ◽  
VINÍCIUS TADEU DE CARVALHO ◽  
SANTIAGO RON ◽  
JUAN CARLOS CHAPARRO ◽  
...  
Keyword(s):  
Morphological Variation ◽  
Color Variation ◽  
Type Locality ◽  
Congeneric Species ◽  
Body Proportions ◽  
Diagnostic Characters ◽  
Type Series ◽  
Poor State ◽  
Amazonas State ◽  
New Diagnosis

The description of Amazophrynella minuta was published in 1941 by the Swedish naturalist Douglas Melin based on material from Taracuá (Amazonas state, Brazil). This description was very brief and based on the morphology of few specimens with diagnostic characters and color variation not well defined. Moreover, the type series is currently in poor state of conservation. Consequently, taxonomic ambiguity surrounds the nominal taxon A. minuta, which hampers the description of many unnamed congeneric species. Herein, we redescribe A. minuta based on recently collected specimens from the type locality, designate a lectotype, formulate a new diagnosis, provide patterns of morphological variation, measurements and body proportions. 

scholarly journals Late Cretaceous stomatopods (Crustacea, Malacostraca) from Israel and Jordan

1998 ◽  
Vol 67 (4) ◽  
pp. 257-266 ◽  
Author(s):  
Cees H.J. Hof
Keyword(s):  
Late Cretaceous ◽  
New Genus ◽  
Abdominal Tergite ◽  
Type Specimen ◽  
New Family ◽  
Original Type

The eryonid decapod Eryon yehoachi Remy & Avnimelech, 1955, from the Late Cretaceous of Israel, is redescribed as a fossil stomatopod species within the new genus Ursquilla. This redescription is based on the original type specimen and two additional records from Israel and Jordan. The material allows a detailed reconstruction of the telson, the sixth abdominal tergite, and part of the uropods. The distinct telson ornamentation of these stomatopods justifies the erection of a new family within the superfamily Squilloidea.

Faunal assemblages from the upper Horseshoe Canyon Formation, an early Maastrichtian cool-climate assemblage from Alberta, with special reference to the Albertosaurus sarcophagus bonebedThis article is one of a series of papers published in this Special Issue on the theme Albertosaurus.

2010 ◽  
Vol 47 (9) ◽  
pp. 1159-1181 ◽  
Author(s):  
Derek W. Larson ◽  
Donald B. Brinkman ◽  
Phil R. Bell
Keyword(s):  
Western North America ◽  
Special Issue ◽  
Warm Climate ◽  
Faunal Assemblage ◽  
Faunal Assemblages ◽  
Relative Rarity ◽  
Fish Remains ◽  
Horseshoe Canyon Formation ◽  
Insight Into ◽  
Cool Climate

The faunal assemblage from the early Maastrichtian portion of the Horseshoe Canyon Formation is described on the basis of four new vertebrate microfossil localities and remains from the Albertosaurus bonebed. All of the localities sampled were deposited during a cool, dry climate at a palaeolatitude of ∼58°N. Thus, these assemblages provide insight into a northern cool-climate assemblage in the early Maastrichtian of western North America. This fauna is characterized by the presence of taxa with more northern affinities, such as Holostean A, champsosaurs, Troodon , and toothed birds. Warm-climate taxa, such as crocodylians, large and diverse turtles, and albanerpetontids are notable in their absence. The Albertosaurus bonebed locality at the top of unit 4 of the Horseshoe Canyon Formation was deposited during the initial stages of a trend to a warmer and wetter climate that is represented in unit 5. The bonebed shares many taxa with the underlying vertebrate microfossil localities. However, a notable difference is the presence of Atrociraptor marshalli from the Albertosaurus bonebed but not the other localities in the upper Horseshoe Canyon Formation. The presence of Atrociraptor may be attributable to this change in climate rather than local ecological conditions. Also, the assemblages are different in the paucity of fish remains in the bonebed, and the relative rarity of shed hadrosaur teeth. The low abundance of aquatic taxa and rarity of shed teeth of hadrosaurs indicate that the locality is largely autochthonous, with little material being transported into the site.

A revision of Pegadomyia Kertész with descriptions of a new genus and four new species (Diptera, Stratiomyidae)

2008 ◽  
Vol 39 (2) ◽  
pp. 171-187
Author(s):  
Damir Kovac ◽  
Rudolf Rozkošný
Keyword(s):  
New Species ◽  
Sri Lanka ◽  
Type Species ◽  
New Genus ◽  
The Philippines ◽  
Diagnostic Characters ◽  
Type Series ◽  
Oceanic Species ◽  
Three New Species ◽  
Australasian Region

AbstractAll Oriental and Australasian/Oceanic species of Pegadomyia are re-examined. A detailed study of the generic characters shows that Pegadomyia actually contains two easily diagnosed genera: Pegadomyia Kertész, 1916 and Pseudopegadomyia gen. n. Pegadomyia now includes the type species P. pruinosa Kertész, 1916 (occurring in Malaysia, Taiwan and Thailand) and three new species: P. ceylonica sp.n. (from Sri Lanka), P. nana sp.n. (from Laos) and P. nasuta sp.n. (from Malaysia). Pseudopegadomyia contains Ps. jamesi sp.n. (based on a type series from the Philippines) and two species originally belonging to Pegadomyia: Ps. glabra (Bezzi, 1928), comb.n. (Fiji Is.) and Ps. nuda (James, 1948), comb.n. (Australasian Region and Philippine Is.). Figures of the diagnostic characters of all treated species are included. Identification keys and a map showing the distribution of all species of both genera are presented.

The freshwater shrimp family Euryrhynchidae Holthuis, 1950 (Crustacea: Decapoda: Caridea) revisited, with a taxonomic revision of the genus Euryrhynchus Miers, 1878

Zootaxa ◽  
2018 ◽  
Vol 4380 (1) ◽  
pp. 1 ◽  
Author(s):  
PAULO P.G. PACHELLE ◽  
MARCOS TAVARES
Keyword(s):  
New Species ◽  
Special Reference ◽  
Taxonomic Revision ◽  
Freshwater Shrimp ◽  
Additional Material ◽  
Diagnostic Characters ◽  
Type Series

The present revision is based on the largest sample of Euryrhynchidae Holthuis, 1950 studied to date, with special reference to Euryrhynchus Miers, 1878. The revision confirms the validity of the 8 currently recognized species of Euryrhynchidae and describes 2 new species related to Euryrhynchus amazoniensis Tiefenbacher, 1978: E. taruman sp. nov. and E. tuyuka sp. nov. The species Euryrhynchus amazoniensis, E. burchelli Calman, 1907, E. pemoni Pereira, 1985 and E. wrzesniowskii Miers, 1878 are redescribed and illustrated based on specimens from the type series and additional material. Additional diagnostic characters are proposed to differentiate the species of Euryrhynchus, previously separated only by the armature of the second pereopod carpus and merus. 

Sign in / Sign up

Export Citation Format

Share Document