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New paper out today that examines the Spinosauridae family. Unfortunately the paper is mostly in Portuguese. Google translate can be very helpful. Paper: "We conclude that out of these 20 taxa six can be regarded as nomina dubia (Ostafrikasaurus crassiserratus, Suchosaurus girardi, Spinosaurus maroccanus, Siamosaurus suteethorni, Sinopliosaurus fusuiensis, Suchosaurus cultridens)due to the lack of diagnostic material and autapomorphies." https://sbpbrasil.org/publications/index.php/paleodest/article/view/357

Bateman, R.M. and DiMichele, W.A., Escaping the voluntary constraints of “tyre-track” taxonomy. Taxon 00 (00), pp. 1–16 Wiley PDF Yours, Paul H.

What is the proper ending for the specific name of Wilkingia terminale: terminale or terminalis? Allorisma was renamed Wilkingia in 1959 by Wilson. I suspect since the genus name was changed the ending of the specific name needed to change to match the case, gender and number of the genus name. Anyone fluent in Latin and good at matching their word endings? http://fossilworks.org/bridge.pl?a=taxonInfo&taxon_no=18845 http://entomology.ifas.ufl.edu/frank/KISS/kiss9.htm

7 ft tall Three toed tracks Walks flat on its feet, not on the sides of its feet Three fingered claw marks Osteoderms in skin Ancestor of cloepus, not bradypus Found in North America (do any known ground sloths have a smaller tail or even no tail at all?)

Study confirms horseshoe crabs are really relatives of spiders, scorpions March 9, 2019 by Kelly April Tyrrell, University of Wisconsin-Madison https://phys.org/news/2019-03-horseshoe-crabs-relatives-spiders-scorpions.html Ballesteros, J.A. and Sharma, P.P., 2019. A Critical Appraisal of the Placement of Xiphosura (Chelicerata) with Account of Known Sources of Phylogenetic Error. Systematic Biology. https://academic.oup.com/sysbio/advance-article/doi/10.1093/sysbio/syz011/5319972 An unrelated article for cat fans is: Scientists have finally discovered what makes celebrity cat Lil Bub so 'magical' It took an international team of geneticists to crack the code of this cat's mystique. by Karin Brulliard, The Washington Post, INFORUM https://www.inforum.com/entertainment/981309-Scientists-have-finally-discovered-what-makes-celebrity-cat-Lil-Bub-so-magical https://www.grandforksherald.com/entertainment/news/4579948-scientists-have-finally-discovered-what-makes-celebrity-cat-lil-bub-so https://phys.org/news/2019-03-reveals-genome-celebrity-cat-lil.html The paper is: Mike Bridavsky et al. Crowdfunded whole-genome sequencing of the celebrity cat Lil BUB identifies causal mutations for her osteopetrosis and polydactyly, (2019). DOI: 10.1101/556761 https://www.biorxiv.org/content/10.1101/556761v1 Yours, Paul

Hi, I have looked through the internet and couldn't find information on this and thought maybe someone passing through could give me and quick answer. Why things share similar words in latin when sometimes they are not related at all. For example Dickin(Sonia) ( a flat Ediacaran animal ) Dick(Sonia) ( a tree fern ) Cook(Sonia) ( one of the first vascular plants ) These are three different species that share not too much. (aside from everything is connected) Or another example is: Archaeo(therium) ( a boar like predator in the Miocene ) Kayenta(therium) ( a semi-aquatic rodentoid from early Jurassic) Mega(therium) ( a huge land sloth from early Pliocene ) Balochi(therium) ( huge hornless rhino from oligocene) However like the Therium family above, this simply means mammal or marsupial. Sonia contains animals and plants. And unlike Therium I still have no explanation for Sonia. If anyone knows, please let me know.

Fossils key to fulfilling Darwin's 160-year-old prediction December 12, 2018, University of Salford https://phys.org/news/2018-12-fossils-key-fulfilling-darwin-year-old.html The paper is: Beck R.M.D., and Baillie C. 2018. Improvements in the fossil record may largely resolve current conflicts between morphological and molecular estimates of mammal phylogeny. Proc. R. Soc. B. 285: 20181632. https://www.biorxiv.org/content/early/2018/07/20/373191 https://www.biorxiv.org/content/biorxiv/early/2018/07/20/373191.full.pdf https://royalsocietypublishing.org/doi/full/10.1098/rspb.2018.1632 Yours, Paul H.

Hi guys! I just uploaded a gallery of modern Carcharhinus upper dentitions: . The images are from my master's thesis (Smith 2015), the full text is available at (https://www.researchgate.net/publication/316735477_Species_discrimination_in_Carcharhinus_shark_teeth_using_elliptic_Fourier_analysis). Unfortunately, due to file size limitations, the images in the paper are not really good enough for detailed analysis of the morphology. So I have uploaded them individually here. I personally extracted the teeth from almost all of these jaws...If I remember correctly, they were soaked in isopropyl alcohol for several days and then the teeth removed with toothpicks and/or just pulling them out with my fingers. I cut up my fingers too many times to count trying to get these suckers out! Only the upper dentition is included; the bottom teeth in Carcharhinus are very same-y so we just focused on the uppers. Keep in mind, these represent only twelve species out of over thirty described species. They are biased towards species today present in the Western Atlantic/Gulf of Mexico. Five species now present in the Western Atlantic/Gulf of Mexico were not included due to lack of specimens/time: C. altimus, C. galapagensis, C. perezi, C. porosus, and C. signatus. Other Carcharhinus dentitions are available on the net. J-elasmo has some, I believe mostly collected from near Japan: http://naka.na.coocan.jp/JAWCarcharhinidae.html. They generally match well with my dentitions, although their Silky (C. falciformis) dentition is more coarsely serrated at the tips than mine, and the lateral notch, which is prominent in my specimens, is basically absent in the J-elasmo dentition. And of course there is Elasmo.com, a great resource for all sharks, not just Carcharhinus. Their C. falciformis dentition is similar to mine, so I don't know what's going on with J-elasmo's dentition, either it's mislabeled or Silky teeth look a lot different in the western Pacific. Or it's just an unusual specimen. And of course there are a bunch of papers online with Carcharhinus teeth, although these are generally isolated fossil teeth. The single best resource I could find for Carcharhinus identication based on teeth is unfortunately difficult to obtain, and would probably require an interlibrary loan request: Garrick, J. A. F. (1982). Sharks of the genus Carcharhinus. US Dep. Commer. NOAA Tech. Rep. NMFS Circular, 445, 194. His shark teeth images are illustrations, but well done, and with a lot of descriptive information. Purdy et al. (2001) is also a good reference:(https://www.researchgate.net/publication/284595551_The_Neogene_sharks_rays_and_bony_fishes_from_Lee_Creek_Mine_Aurora_North_Carolina). You can find references to several papers related to fossil Carcharhinus, as well as a general overview of their fossil record, in my thesis. Finally, I'm attaching a figure from my thesis, illustrating the morphological terminology used: C. falciformis, upper right jaw, 5th position from symphysis. Feel free to add additional references or information about the genus Carcharhinus. Or if anything is incorrect in this post. The subject of fossil Carcharhinus tooth identification comes up fairly regularly in the forums, so let's try and stick as much information in here as possible!

Everything you always wanted to know about nomenclature and taxonomy. A workshop at the Museum of Natural History Vienna: http://193.170.196.88/workshops/Workshop_Nomenklatur_Vortrag.pdf (roughly 20MB - 142 pages) Have fun Thomas

So I've been reading about paleontology for awhile now, I've read all sorts of books and articles and theses, but the one thing I don't understand is what is the complete list of levels of classification? The average example usually shows eight, in this order: Domain, Kingdom, Phylum, Class, Order, Family, Genus, and Species. But since this is only basic taxonomy there are more than just eight; the ones I know are: Domain, Kingdom, Phylum, Subphylum, Grandclass, Class, Subclass, Infraclass, Legion, Cohort, Grandorder, Order, Suborder, Family, Subfamily, Tribe, Genus, Species, and Subspecies; but then I remembered seeing the clade with dinosaurs and birds was shared, so where is clade in the list, and are there more classifications than I mentioned? If so, then what are they and how many do paleontologists typically actually use, and are classifications used in that order all the time, or are there some classifications that have no specific order?

Hi all, How do you all go about pronouncing the scientific names of species that you find? So far, I've just gone with what sounds right and tweaked it based off what I hear others say. Most genus and species names are derived from Greek and Latin I believe, so looking at pronunciations in those languages may help. But is there any outside resource that you all use, or do you just say it how you see it? I'd hate to disrespect a shark by butchering his name!

Can a better linguist than I (not hard!) help out here? The belemnite species suffix for Lagonibelus beaumontiana (d'Orbigny) would presumably be based on "belus" being feminine. However, original Russian sources give it as "L. beaumontianus" and other belemnite genera with the same element (Pleurobelus, Gastrobelus etc.) all have masculine species endings. I know gender endings can be tricky and -us isn't always masculine but there seems to be widespread discrepancy here. (The London NHM and Martill & Hudson's Fossils of the Oxford Clay both go with beaumontiana and we should be able to trust them to get it right...)

What does it take for a species to officially be “described”? I know there must be more than just having a paper written about it, there must be some minimum requirements for the contents of the paper. And am I correct that you can’t establish a full species name unless it has been “described”?

Are Mosasaurs considered lizards?

Is it possible that not all the creatures we call fish are actually fish?

The best way to include fossils in the 'tree of life' January 10, 2017 http://www.bristol.ac.uk/news/2017/january/tree-of-life.html http://phys.org/news/2017-01-fossils-tree-life.html Puttick, M. N,., J. E. O'Reilly, A. R. Tanner, and others, 2017, Uncertain- tree: discriminating among competing approaches to the phylogenetic analysis of phenotype data, Proceedings of the Royal Society B. Published 11 January 2017.DOI: 10.1098/rspb.2016.2290 http://rspb.royalsocietypublishing.org/content/284/1846/20162290 Yours, Paul H.

Does anyone know where I can see/get a full copy of this paper? The generic taxonomy of Pennsylvanian age marattialean fern frond adpressions Cleal, Christopher J., Palaeontographica Abteilung B Volume 292 Issue 1-3 (2015), p. 1 – 21 Jan 23, 2015 Thanks, Chris

What would the following be for a general fossil found in the Pholadomya genus? Modes of life: Taxonomy: Fossil Range: Anatomical Features: Nicknames:

Trouble in classification may require getting rid of Reptilia... http://phys.org/news/2014-10-reptiles.html

The following text is largely a translation of an article I wrote for the Nederlandse Varenvereniging (Dutch Fern Society) in 2010, for a special issue on fossil ferns. I updated the text where needed and made a few expansions/changes. Unfortunately, I had to leave out quite some of the figures of the original text. Hopefully though, some TFF members may still find the text useful, and perhaps even entertaining. Taxonomy (derived from the Greek terms “taxis” and “nomina”, translating into “arrangement method”) is the science which deals with the study of identifying, grouping, and naming organisms according to their established natural relationship. For plants, the onset of taxonomy is marked by Linnaeus’ work Species Plantarum, published in 1753, which introduced the concepts of their biological classification and contains the first scientific plant names nowadays considered to be validly published [stace, 1991]. In theory, the basic principles as laid out by Linnaeus are (and should be!) the same for both extant and fossil (extinct) plants. In practice however, there are some notable and inevitable differences. DNA analysis for example, becoming more and more important in the taxonomy of extant organisms, usually cannot be applied to fossils. Below, we will briefly discuss the methodology adopted by palaeobotanists to overcome these practical hurdles and classify plant fossils. Palaeobotanical nomenclature While fragments of leaves, branches, bark, reproductive organs and parts of the rooting system are rather common finds, fossil remains of larger parts, or of the plants as a whole, are extremely rare to non-existent. To cope with this, the nomenclature used in the classification of plant fossils is somewhat different from that used by botanists for extant plants, and this can cause some confusion. Within the regular Linnaean system of botanical nomenclature, each plant –as a whole– is given one single name, consisting of a genus- and species name. Higher hierarchical taxa (such as family, order and class) indicate the more distant relations between species. Palaeobotanists use similar binomial names, but assign separate systematic names to the different parts of plants, such as foliage and roots, thereby enabling the classification of small fossil fragments. A single plant can easily give rise to five or six fossil genera this way [Cleal and Thomas, 1994, p. 46]. Fossil taxa The lycophytes, distant relatives of the extant shrub Lycopodium, form a nice example. During Carboniferous times, these plants formed a major element of the swamp floras. Some of the plants could attain heights well over 30 meters [bateman et al., 1992], and finding the fossil remains of a complete specimen is therefore virtually impossible. This difficulty is reflected in lycophyte systematics in a number of ways. Stigmaria (text-fig. 1) for example, represents the roots of several types of lycopods, such as Lepidodendron and Sigillaria. Grouping the roots together in one genus is the only workable solution, as they are found almost exclusively disconnected from the subaerial parts of the plants. From a biological perspective, further separation would be desirable, of course. However, we cannot make the distinction on basis of the limited fossil evidence. This limitation has significant consequences though. Now, we can't include Stigmaria in the Lepidodendraceae, nor can we group it into the Sigillariaceae; the fossil genus has limited biological meaning. There is also no such thing as a ‘Stigmaria plant’, bearing Stigmaria leaves and Stigmaria branches. These and the other distinct structures, such as the reproductive organs, are assigned their own generic names. Text-figure 1: Stigmaria, the roots of several types of lycophytes, but not a complete plant Morphotaxa Identification problems commonly arise when having to distinguish between true ferns and a group of early gymnosperms, informally known as the pteridosperms. I would like to ask you to take a close look at text-figure 2 now, for the proof of the pudding is in the eating. Without consulting the caption: how many and which ones of these fossil fragments represent true ferns? Text-figure 2: caption with answers can be found at the end of this post The way the question is formulated probably raises a suspicion that pteridosperms are among these fragments. Indeed, there are. However, in the beginning of the nineteenth century (the early days of palaeobotany as a science) all these fossils would probably have been classified as ferns. This is not that strange, really, as the compound leaves –at least superficially– show great resemblance. As a matter of fact, their fronds are so similar that the pteridosperms are also known as “seed ferns”. This is a rather misleading name, since pteridosperm biology is quite different from that of the ferns; they bore seeds and are more closely related to the cycads [Cleal and Thomas, 2009, p. 138]. Started to wonder how well you did as a palaeobotanist? The caption (can be found at the end of this post) lists which of the specimens are ferns and which are pteridosperms. Fern- and pteridosperm fronds can be distinguished from one another with certainty only after a fossil specimen bearing either sporangia or seeds (ovules) has been found. The third fragment (text-fig. 2) shows an example from the Middle Triassic of Australia, where the frond on the right-hand side of the photo bears sporangia [see also Holmes, 2001]. However, the great majority of fossil specimens consists of sterile fronds, lacking such diagnostic features. Again, palaeobotanists turn to the usage of an artificial classification scheme, namely that of morphotaxa [e.g. Brongniart, 1822]. This system is based on the shape of the pinnules and the larger scale architecture of the fronds. It is thus based solely on the morphology of the fossil, and not on biological affinity. As a consequence, morphogenera act like “collector bins” for species that cannot be assigned to proper fossil genera and thereby generally contain several types of plants. Foliage belonging to the morphogenus Pecopteris, for instance, was not only borne by several Filicales and Marattiales ferns (among which the Carboniferous tree-fern Psaronius), but also by at least one pteridosperm [Taylor et al., 2009, p. 680]. In this regard morphogenera differ from fossil genera, such as Lepidodendron and Stigmaria. The latter names immediately tell us that we’re dealing with lycophytes. As soon as sufficient evidence to do so becomes available –such as in the rare case a fertile frond or one with attached seeds is found– the species is placed in a more natural, fossil genus. Scolecopteris, for example, represents species with a pecopterid (Pecopteris-like) appearance that have a known marattialean affinity. This could be discerned through exceptionally well preserved fossils (so-called “coal balls”), in which the sporangia can be studied in detail [e.g. Ewart, 1961]. Note that such finds only provide evidence for the specific species concerned in the attachment and do not generalize to the form-genera to which they belong. Morphogenera are not completely abandoned, even when the biological affinity is known, for it is convenient to keep them as a synonymy [Chaloner, 1986]. Usage of a full name like Asterotheca (al. Pecopteris) arborescens (Schlotheim) Kidston, 1924, for instance, makes it immediately clear that this frond has a pecopterid morphology. Effect of taphonomy Taphonomy is a common source of bias in the fossil record and may also become important for the identification of single specimens, hence a short note here. For a more extensive discussion on taphonomy and its effects the reader is referred to the CarboBase page on the subject and the references given there. Taphonomy is a collective term for all the processes that affect plant remains as they go from the biosphere to the lithosphere. A fossil may, for example, have been transported, abraded, decayed or partially eaten before becoming buried in the sediment and onset of fossilization. As a consequence, there is considerable variation in the degree of preservation between fossils; some specimens can show signs of significant rot before conservation. This is again nicely illustrated by the lycophytes, as the lowermost stem portions of Sigillaria trees often experienced significant decortication prior to burial and fossilization. Compared to regular Sigillaria specimens, the resulting bark fossils –referred to as Syringodendron– lack leaf cushions, but instead only display pairs of markings. It should be noted that, used in this manner, the name Syringodendron represents no taxonomically independent genus, but only a (morphologically distinct) decortication state of another. Similarly, Knorria represents bark of the Lepidodendron-type that underwent some degree of rotting before fossilization. Post-burial alteration can also be important, as fossils occur in many forms of preservation (compressions, permineralisations, etc.), depending on the conditions prevailing during fossilization and diagenesis. Each of these preservation modes can provide different types of information. However, this variation can considerably complicate taxonomy, as palaeobotanists will always have to decide whether the differences they observe between any two fossils are truly biologic or, alternatively, due to another type of fossilization. Sometimes this gives rise to the usage of different fossil genus and species names for what might very well be the same plant. The fossil genera Calamites and Arthropitys represent, respectively, the compressions and anatomically preserved fossils of calamite stems, for example. Complete plant reconstructions One of the most challenging aspects of palaeobotany is trying to reconstruct what the whole plant would have looked like. These reconstructions are of key importance, because analytical methods used in systematic biology to determine the evolutionary relations between organisms (such as cladistics) do not work well on separate organs [Cleal and Thomas, 2009, p. 46]. Reconstruction of the whole plant requires us to group together the fossils we treated and named as separate entities until now. In the reconstruction of the giant horsetail-tree Calamites (text-fig. 3), for example, Calamites (stems), Annularia (foliage), Calamostachys (cones), and Pinnularia (rootlets) are associated with each other. Text-figure 3: Reconstructions of the Calamites-tree. Schematics modified from Taylor et al. (2009) and Langford Producing such a complete plant reconstruction is comparable to assembling a complex jigsaw puzzle. Or, actually, more like building a couple of these puzzles simultaneously, as generally different kinds of plants have fossilized together. Also, important pieces of the puzzle might still be missing (you don’t know how many) and, moreover, there is no box with example picture to work with. Furthermore, convergent or divergent evolution may have resulted in multiple plants with, for example, similar foliage but different reproductive organs [Cleal and Thomas, 1994, p. 46], as was shown earlier to be the case for ferns and pteridosperms (text-fig. 2). It is not surprising we sometimes have to make assumptions due to the difficulties outlined above. As a consequence, whole plant reconstructions are always, at least to some extent, hypothetical. This is also the case for Tempskya, a genus of “false trunk” tree ferns, known principally from silicified trunks from the Cretaceous. The characteristics of the petioles and petiole traces on these fossils suggest Tempskya bore small-sized, abundant foliage along the length of its trunk instead of a crown of fronds [Taylor et al., 2009, p. 458]. The reconstruction of Tempskya incorporates this evidence. However, fossils of the fronds themselves have never been found [stewart en Rothwell, 2009, p. 257; Taylor et al., 2009, p. 458] and their appearance in the reconstruction is therefore open for interpretation of the artist. It is very well possible whole plant reconstructions need to be modified when more fossil evidence becomes available. As a consequence the literature generally contains multiple reconstruction proposals for the same plant group [e.g. Pfefferkorn et al., 1984, p. 3]. Therefore, it is important we appreciate these complete plant reconstructions for what they are: not taxonomic species, but working-hypotheses, based on the best data available at the time. Notes on scientific names As already briefly mentioned in the section on palaeobotanical nomenclature, plant fossils (and extant plants alike) are assigned a name, consisting of a genus- and species name. This paragraph provides some further general notes on scientific names. It is customary to write these names in italics, where only the genus name gets a capital letter. The complete record should also contain the name of the author who first described the species, together with the year of publication of this description: e.g.: Calamites suckowii Brongniart, 1828 The species in the example above belongs to the genus Calamites, and was first described by Brongniart in the year 1828. When subsequent changes are made to the classification of a species, this should be included in the scientific name in certain cases. When the species is transferred to a different or amended genus, for example, the first, original author is only mentioned between brackets, followed by the author who published the amended diagnosis and the year of publication of this change: e.g.: Alethopteris serlii (Brongniart) Göppert, 1836 In 1828, Brongniart originally published the species of the example above as Pecopteris serlii. Subsequent work in 1836 by Göppert led to the transfer of this species to another genus, namely Alethopteris (a genus name coined by Sternberg in 1826). Sometimes it is very difficult to classify a fossil with certainty. In such cases, taxonomists make use of so-called “open nomenclature” [bengtson, 1988]. The following three abbreviations are used most frequently when the classification is uncertain. When “aff.” precedes the species name this indicates that the specimen is considered to be a possible new species, closely related to the mentioned species. The material is insufficient for the formal formulation of a new species though (used mainly in the literature). When “cf.” precedes the species name this indicates that the determination is uncertain. This may be due to poor preservation of the fossil. Sometimes “?” is also used for this purpose. In the example below, the fossil specimen probably belongs to the species Calamites suckowii, but some characteristics could not be discerned due to poor preservation. e.g.: Calamites cf. suckowii Brongniart, 1828 When “sp.” is written after a genus name this indicates that the specimen couldn’t be related to any established species. e.g.: Calamites sp. In this example, the fossil specimen is considered to belong to the genus Calamites, but the species couldn’t be determined (or no further classification attempt has been made yet). Note the caption of text-figure 3 contains open nomenclature. Caption text-figure 2: Several fossils of ferns and pteridosperms. Pteridosperms: A, B, C, D, E and I. Ferns: C, F, G and H. How many did you get right? For the enthusiasts: A = Mariopteris cf. muricata, B = Alethopteris davreuxii, C = Asterotheca chevronervia, D = Eusphenopteris striata, E = Alethopteris serlii, F = Pecopteris sp., G = Pecopteris polymorpha, H = Renaultia crepinii, I = Callipteridium gigas.