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476 results for “species boundaries”
Data from: Understanding species boundaries that arise from complex histories: Gene flow across the speciation continuum in the spotted whiptail lizards
<p>Gene flow between diverging lineages challenges the resolution of species boundaries and the understanding of evolutionary history in recent radiations. Here, we integrate phylogenetic and coalescent tools to resolve reticulate patterns of diversification and use a perspective focused on evolutionary mechanisms to distinguish interspecific and intraspecific taxonomic variation. We use this approach to resolve the systematics for one of the most intensively studied but difficult to understand groups of reptiles: the spotted whiptail lizards of the genus <em>Aspidoscelis </em>(<em>A. gularis </em>complex). Whiptails contain the largest number of unisexual species known within any vertebrate group and the spotted whiptail complex has played a key role in the generation of this diversity through hybrid speciation. Understanding lineage boundaries and the evolutionary history of divergence and reticulation within this group is therefore key to understanding the generation of unisexual diversity in whiptails. Despite this importance, long-standing confusion about their systematics has impeded understanding of which gonochoristic species have contributed to the formation of unisexual lineages. Using reduced representation genomic data, we resolve patterns of divergence and gene flow within the spotted whiptails and clarify patterns of hybrid speciation. We find evidence that biogeographically structured ecological and environmental variation has been important in morphological and genetic diversification, as well as the maintenance of species boundaries in this system. Our study elucidates how gene flow among lineages and the continuous nature of speciation can bias the practice of species delimitation and lead taxonomists operating under different frameworks to different conclusions (here we propose that a two species arrangement best reflects our current understanding). In doing so, this study provides conceptual and methodological insights into approaches to resolving diversification patterns and species boundaries in rapid radiations with complex histories, as well as long-standing taxonomic challenges in the field of systematic biology.</p>
Linked collectors and determiners for: Liogenys Guérin-Méneville, 1831 (Coleoptera: Scarabaeidae: Melolonthinae) from the southern South American Transition Zone and boundaries: taxonomic overview with four new species.
Natural history specimen data linked to collectors and determiners held within, "Liogenys Guérin-Méneville, 1831 (Coleoptera: Scarabaeidae: Melolonthinae) from the southern South American Transition Zone and boundaries: taxonomic overview with four new species". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/d7dbbc1f-416c-4365-a32b-a9618e6c1fe9">https://bionomia.net/dataset/d7dbbc1f-416c-4365-a32b-a9618e6c1fe9</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/d7dbbc1f-416c-4365-a32b-a9618e6c1fe9">https://gbif.org/dataset/d7dbbc1f-416c-4365-a32b-a9618e6c1fe9</a>. Formatted as a Frictionless Data package.
Data from: Ancestral hybridization yields evolutionary distinct hybrids lineages and species boundaries in crocodiles, posing unique conservation conundrums
<p>Interspecific hybridization can lead to adaptation and speciation, especially in the context of recent radiations. The emblematic <em>Crocodylus</em> (true crocodiles) is the most broadly distributed, ecologically diverse, and species-rich crocodylian genus. Nonetheless, their within-species evolutionary processes are poorly resolved mainly due to their potential for hybridization. Notably, the evolutionary outcomes when hybridization is ancient and involves long-lived species, like crocodiles, remain largely unexplored. Here, we evaluate the genomic admixture between the American (<em>Crocodylus</em> <em>acutus</em>) and the Morelet's (<em>Crocodylus</em> <em>moreletii</em>) species, and demonstrate that this hybridization system challenges the definition of species boundaries and poses a triple conservation conundrum: what has been recognized as <em>C. acutus</em> is actually two distinct species, therefore its taxonomic reassessment is needed; we identified two evolutionary distinct hybrids lineages, which are genetically discernible from the parental species; the remaining <em>C. moreletii </em>populations evidence its likely extinction as a species and/or evolution via hybridization. Hence, the crocodiles' distinct species and hybrids lineages warrant recognition and need urgent conservation efforts.</p>
Fig. 21 in First Crania and Assessment of Species Boundaries in Nimbadon (Marsupialia: Diprotodontidae) from the Middle Miocene of Australia
Fig. 21. Variation in the cerebellar face of the right periotic of Nimbadon lavarackorum. A, QM F53848; B, QM F53847; C, QM F30904; D, QM F53866.
Fig. 18 in First Crania and Assessment of Species Boundaries in Nimbadon (Marsupialia: Diprotodontidae) from the Middle Miocene of Australia
Fig. 18. Representative Nimbadon lavarackorum glenoid regions in occlusal (A–B) and lateral (C–D) views. A, QM F53642; B, QM F31541; C, QM F31377; D, QM F50470. Not to scale.
Fig. 17 in First Crania and Assessment of Species Boundaries in Nimbadon (Marsupialia: Diprotodontidae) from the Middle Miocene of Australia
Fig. 17. Variation in Nimbadon lavarackorum basicranial structures. A, QM F42677; B, QM F40345; C, QM F53642; D, QM F50470. Not to scale.
Fig. 20 in First Crania and Assessment of Species Boundaries in Nimbadon (Marsupialia: Diprotodontidae) from the Middle Miocene of Australia
Fig. 20. Variation in the tympanic face of the right periotic of Nimbadon lavarackorum. A, QM F53848; B, QM F53844; C, QM F53842; D, QM F53846.
Fig. 16 in First Crania and Assessment of Species Boundaries in Nimbadon (Marsupialia: Diprotodontidae) from the Middle Miocene of Australia
Fig. 16. Lateral (A–F) and dorsal (A9–F9) profiles of representative Nimbadon lavarackorum adult skulls from AL90 site. A– A9, QM F53642; B– B9, QM F40345; C– C9, QM F53645; D–D9, QM F31377; E–E9, QM F50470; F–F9, QM F31541. See text for explanation of numbers.
Fig. 14 in First Crania and Assessment of Species Boundaries in Nimbadon (Marsupialia: Diprotodontidae) from the Middle Miocene of Australia
Fig. 14. Morphological variation in the RP3 of Nimbadon lavarackorum from AL90 site. Specimens used are as follows: A, QM F53653; B, QM F50696; C, QM F50695; D, QM F53784; E, QM F30833; F, QM F53659; G, QM F50694; H, QM F53643; I, QM F42677; J, QM F50745; K, QM F53654; L, QM F30781. Specimens A, E, J, K and L are mirror images of left P3's to facilitate comparison. 1, weak buccal emargination between anterior and posterior moieties compared with 2, strong emargination; 3, short parastylar shelf as opposed to 4, elongate; 5, weak anterolingual cingulum compared with 6, well developed; 7, hypocone absent compared to 8, small or 9, moderately developed; 10, anterior hypocone crest present; 11, protocone large and bulbous as opposed to 12, small, or 13, narrow and lingually compressed; 14, parastyle small compared with 15, well developed; 16, parastyle hooked; 17, deep transverse valley separating parastyle from parametacone base, compared with 18, shallow valley or 19, valley absent entirely; 20, anterolingual parametacone crest terminates at valley between protocone and parametacone bases as opposed to 21, meets the lingual cingulum or 22, meets a buccal protocone crest; 23, posterobuccal cingulum absent compared to 24, well developed; 25, mesostyle present; 26, weak anterolingual emargination between pas and protocone compared with 27, strong emargination.
Fig. 15 in First Crania and Assessment of Species Boundaries in Nimbadon (Marsupialia: Diprotodontidae) from the Middle Miocene of Australia
Fig. 15. Lingual view of select left P3's of Nimbadon lavarackorum showing variation in the size, structure, and development of accessory crests of the (unworn) parastyle. A, QM F53651; B, QM F30781 (mirror image); C, QM F53654; D, QM F53653.
Fig. 13 in First Crania and Assessment of Species Boundaries in Nimbadon (Marsupialia: Diprotodontidae) from the Middle Miocene of Australia
Fig. 13 (A–H). Bivariate plots of select cranial variables in Nimbadon lavarackorum from AL90 against skull length.
Fig. 11 in First Crania and Assessment of Species Boundaries in Nimbadon (Marsupialia: Diprotodontidae) from the Middle Miocene of Australia
Fig. 11. Craniomandibular measurements for univariate analyses of Nimbadon lavarackorum. For definition of measurements, see table 1.
Fig. 10 in First Crania and Assessment of Species Boundaries in Nimbadon (Marsupialia: Diprotodontidae) from the Middle Miocene of Australia
Fig. 10. Nimbadon lavarackorum dentition: A–C, dP3 (QM F53648a); D–F, right I1 (QM F50698); G–I, right i1 (QM F50703); J–L, dp3 (QM F30784). A–A9, occlusal stereopair; B, buccal view; C, lingual view; D, buccal view; E, occlusal view; F, lingual view; G, buccal view; H, occlusal view; I, lingual view; J–J9, occlusal stereopair; K, buccal view; L, lingual view; M–M9, occlusal stereopair left lower cheektooth row (QM F40337); N–N9, occlusal stereopair left upper cheektooth row (QM F31377).
Fig. 7 in First Crania and Assessment of Species Boundaries in Nimbadon (Marsupialia: Diprotodontidae) from the Middle Miocene of Australia
Fig. 7. Nimbadon lavarackorum mandible (QM F40337). Gray areas represent broken areas. Gray line represents epoxy resin join.
Fig. 1 in First Crania and Assessment of Species Boundaries in Nimbadon (Marsupialia: Diprotodontidae) from the Middle Miocene of Australia
Fig. 1. Stylized drawing of Nimbadon lavarackorum cranium showing major features: A, dorsal view; B, occlusal view; C, lateral view.
Fig. 9 in First Crania and Assessment of Species Boundaries in Nimbadon (Marsupialia: Diprotodontidae) from the Middle Miocene of Australia
Fig. 9. Nimbadon lavarackorum subadult dentary (QM F53792) in medial view. Gray areas represent broken areas.
Fig. 5 in First Crania and Assessment of Species Boundaries in Nimbadon (Marsupialia: Diprotodontidae) from the Middle Miocene of Australia
Fig. 5. Nimbadon lavarackorum left periotic (QM F53848): A, tympanic (lateral) face; B, cerebellar face.
Fig. 8 in First Crania and Assessment of Species Boundaries in Nimbadon (Marsupialia: Diprotodontidae) from the Middle Miocene of Australia
Fig. 8. Nimbadon lavarackorum mandible (QM F40337) in lateral view. Gray areas represent broken areas. Gray line represents epoxy resin join.
Figure S1 in Genetic analysis and ecological niche modeling delimit species boundary of the Przewalski's scorpion (Scorpiones: Buthidae) in arid Asian inland
Figure S1. Bayesian consensus tree of the Mesobuthus caucasicus complex reconstructed from mitochondrial DNA sequences.
Figure 9 in Genetic analysis and ecological niche modeling delimit species boundary of the Przewalski's scorpion (Scorpiones: Buthidae) in arid Asian inland
Figure 9. Phylogeny the Mesobuthus caucasicus complex reconstructed using mitochondrial DNA sequences. The Przewalski's scorpion (M. przewalskii) is deeply diverged from other species and the Chinese scorpion (M. martensii) belongs to the species complex. Node supports are shown by bootstrapping probabilities from 1000 replicates and Bayesian posterior probabilities.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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