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97 results for “Monitor lizard”
FIGURE 1 in Integrative taxonomy and phylogeny-based species delimitation of Philippine water monitor lizards (Varanus salvator Complex) with descriptions of two new cryptic species
FIGURE 1. The distribution of the Varanus salvator Complex water monitor species. Pleistocene Aggregate Island Complex (PAIC) faunal regions in the Philippines (indicated by island group color differences) are delineated by the 120m underwater contour (Voris 2000; Brown & Diesmos 2009). Both V. togianus and V. s. macromaculatus are reported to occur on Sulawesi Island (Koch et al. 2010a). The distribution of V. rasmusseni is denoted with an asterisk, "*", while the distributions of the two newly identified evolutionary lineages (Welton et al. 2013a,b) are denoted by question marks (?); see Figure 2.
FIGURE 2 in Integrative taxonomy and phylogeny-based species delimitation of Philippine water monitor lizards (Varanus salvator Complex) with descriptions of two new cryptic species
FIGURE 2. Distribution of Philippine species in the Varanus salvator Complex, and Maximum Likelihood phylogenetic inference (RAxML v7.5.4; Stamatakis, 2006) for the V. salvator Complex with Bayesian support values (MrBayes v3.2; Ronquist et al. 2011) mapped onto relevant nodes. Solid circles indicate posterior probabilities>95 and bootstrap support>75, open circles indicate bootstrap support>75 only. Asterisk "*" denotes sampling from Semirara Island. Open stars indicate type localities for V. dalubhasa sp. nov. (Bicol Peninsula, Luzon Island) and V. bangonorum sp. nov. (Mindoro Island). Scale bar represents number of changes.
FIGURE 9 in Integrative taxonomy and phylogeny-based species delimitation of Philippine water monitor lizards (Varanus salvator Complex) with descriptions of two new cryptic species
FIGURE 9. Holotype of Varanus bangonorum sp. nov. (PNM 9798), with body shown in dorsal and ventral aspects; and head shown in dorsal, ventral and profile aspects. Scale = 50 mm.
FIGURE 1 in On the type selection and re-typification of two monitor lizard taxa (Squamata: Varanidae): Monitor bivittatus celebensis Schlegel, 1844 and Monitor kordensis Meyer, 1874; with some comments and corrections on other name-bearing type specimens
FIGURE 1. The adult holotype (RMNH 3179) of Monitor bivittatus celebensis Schlegel, 1844 (at present Varanus salvator celebensis). Dorsal view (A), ventral view (B).
Data from: High nest failure in a zebra finch population and persistent predation of a nest by a monitor lizard
<p>Predation is well known to have substantial effects on behaviour and fitness in many animals. In songbirds, nest predation is rarely observed directly, so that research focusses primarily on the consequences of predation and less on the behaviour of the predator. Here, we report predation data in a zebra finch (<em>Taeniopygia catanosis</em>) nest box population, highlighting a 22-min-long sequence, captured on video, of a sand goanna (<em>Varanus gouldii</em>) predating a zebra finch nest in the wild. This monitor lizard appeared to be extremely persistent with climbing and jumping up to the next box nine times, including three successive unsuccessful attempts that lead to a change in approach strategy. It removed all six nestlings from the nest box during those repeated approaches and consumed them. In combination with overall high predation rates in the study population we document here, the findings highlight the role that a single predator species can have on nest success and, thus potentially also breeding decisions and social organisation of the prey population. Specifically so in a species like the zebra finch which synchronises reproductive attempts through the use of social information acquired through nest inspections and which uses social hotspots where they could gather information on changes in local social composition due to the individualised signals they use.</p>
Figure 12 in Two new species of monitor lizards (Squamata: Varanus) endemic to the Louisiade and Tanimbar Archipelagos with a key to the subgenus Euprepiosaurus
Figure 12. Adult Varanus tanimbar sp. nov. (WAM 109896) Lorulun, Yamdena Island (photo Richard How).
Figure 11 in Two new species of monitor lizards (Squamata: Varanus) endemic to the Louisiade and Tanimbar Archipelagos with a key to the subgenus Euprepiosaurus
Figure 11. Juvenile Varanus tanimbar sp. nov. caught by local hunters at Saumlaki, Yamdena (photo VW).
Figure 3 in Two new species of monitor lizards (Squamata: Varanus) endemic to the Louisiade and Tanimbar Archipelagos with a key to the subgenus Euprepiosaurus
Figure 3. Dorsal, ventral and head profile of the holotype (ZMUT Sa197) of Varanus louisiadensis sp. nov.
Figure 2 in Two new species of monitor lizards (Squamata: Varanus) endemic to the Louisiade and Tanimbar Archipelagos with a key to the subgenus Euprepiosaurus
Figure 2. Linear discriminant analysis showing morphospaces for members of the Varanus indicus group based on scalation characters P, Q, R, S, T, N, XY and m.
Figure 1 in Two new species of monitor lizards (Squamata: Varanus) endemic to the Louisiade and Tanimbar Archipelagos with a key to the subgenus Euprepiosaurus
Figure 1. Map of the western Pacific region showing the geographic ranges of the species of the Varanus indicus group.
Figure 10 in Two new species of monitor lizards (Squamata: Varanus) endemic to the Louisiade and Tanimbar Archipelagos with a key to the subgenus Euprepiosaurus
Figure 10. Adult Varanus tanimbar sp. nov. male killed by local hunters near Saumlaki, Yamdena (photo VW).
Figure 7 in Two new species of monitor lizards (Squamata: Varanus) endemic to the Louisiade and Tanimbar Archipelagos with a key to the subgenus Euprepiosaurus
Figure 7. Map of the Papuan region (A) with the Tanimbar Islands (B) and Louisiade Archipelago (C) enlarged. The type locality of Varanus louisiadensis sp. nov. on Misima island is indicated with a filled circle, and additional collection localities for the paratypes on Sudest and Rossell are indicated by open circles. The type locality of V. tanimbar sp. nov., Latdalam, is indicated by a filled star, and the collection locality of one of the paratypes at Adaut, Selary Island, with an open star.
Data from: Claw morphometrics in monitor lizards: variable substrate and habitat use correlate to shape diversity within a predator guild
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Data from: High nest failure in a zebra finch population and persistent predation of a nest by a monitor lizard
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Data from: Dragons in our midst: phyloforensics of illegally traded Southeast Asian monitor lizards
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Data from: Multilocus phylogeny and Bayesian estimates of species boundaries reveal hidden evolutionary relationships and cryptic diversity in Southeast Asian monitor lizards
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Phylogenomics of monitor lizards and the role of competition in dictating body size disparity
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Supposed "snake specialist" consumes monitor lizards: diet and trophic implications of king cobra feeding ecology
<p>King cobra predation events on <em>Varanus nebulosus. </em>Included: photographic evidence of each event, king cobra biometric data from most recent measurements and location information.</p> <p>.csv file column headings:</p> <p>folderid: The Zenodo folder ID containing the photographic evidence of event.</p> <p>obvdate: Date of observation (yyyy-mm-dd)</p> <p>obvtime: Time of observation (24hr)</p> <p>snakeid: Unique ID given to individual king cobras captured</p> <p>svlmm: King cobra snout-to-vent length (mm)</p> <p>tlmm: King cobra tail length (mm)</p> <p>totalmm: King cobra total length (mm)</p> <p>massg: King cobra mass (g)</p> <p>easting: UTM easting (UTM Zone 47N; Datum WGS84)</p> <p>northing: UTM northing (UTM Zone 47N; Datum WGS84)</p> <p>gpsaccm: Accuracy of GPS location (m)</p> <p>notes: Comments on predation event</p>
Data from: Unidirectional pulmonary airflow patterns in the savannah monitor lizard
The unidirectional airflow patterns in the lungs of birds have long been considered a unique and specialized trait associated with the oxygen demands of their volant lifestyle, endothermic metabolism and unusual pulmonary architecture; however, the discovery of similar flow patterns in the lungs of crocodilians indicates that this character is likely ancestral for all archosaurs, the group that includes extant birds and crocodilians as well as their extinct relatives, such as pterosaurs and dinosaurs. Unidirectional flow in birds results from aerodynamic valves, rather than from sphincters or other physical mechanisms, and similar aerodynamic valves appear to be at work in crocodilians. Due to anatomical and developmental similarities in the primary and secondary bronchi of birds and crocodilians, these structures and airflow patterns may be homologous. Thus the origin of this pattern is at least as old as the split between crocodilians and birds, which occurred in the Triassic; however, it is possible that this pattern of flow is even older. This constitutes an alternative hypothesis, which can be tested by investigating patterns of airflow in members of the outgroup to birds and crocodilians, the Lepidosauromorpha (tuatara, lizards, and snakes). Here we show region-specific unidirectional airflow in the lungs of the savannah monitor lizard (Varanus exanthematicus). The presence of unidirectional flow in the lungs of V. exanthematicus thus gives rise to two possible evolutionary scenarios: (1) unidirectional airflow evolved independently in archosaurs and monitor lizards, or (2) these flow patterns are homologous in archosaurs and V. exanthematicus, having evolved only once in ancestral diapsids. If unidirectional airflow is plesiomorphic for Diapsida, this respiratory character can be reconstructed for extinct diapsids, and evolved in a small ectothermic tetrapod during the Paleozoic Era at least 100 million years before the origin of birds.
FIGURE 30 in Unravelling the underestimated diversity of Philippine water monitor lizards (Squamata: Varanus salvator complex), with the description of two new species and a new subspecies
FIGURE 30. Dorsal view of the holotype of V. nuchalis (BMNH 1946.9.1.17). Photo by André Koch.
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