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Spiders can be recognized by counting their legs [article]

Sarah Berkemer, Ricardo Chaves, Adrian Fritz, Marc Hellmuth, Maribel Hernandez-Rosales, Peter F. Stadler
2014 arXiv   pre-print
Spiders are arthropods that can be distinguished from their closest relatives, the insects, by counting their legs. Spiders have 8, insects just 6.  ...  Here we show that spiders can be recognized directly from their degree sequences through the number of their legs (vertices with degree 1).  ...  The structure of P 4 -sparse graphs can be characterized in terms of so-called spiders [7, 8] . Hence, the cograph editing problem can be rephrased as a "spider editing problem".  ... 
arXiv:1411.2105v1 fatcat:vbtcbsnkdjbdfmc64jmxhg5gva

Spiders can be Recognized by Counting Their Legs

Sarah J. Berkemer, Ricardo R. C. Chaves, Adrian Fritz, Marc Hellmuth, Maribel Hernandez-Rosales, Peter F. Stadler
2015 Mathematics in Computer Science  
Spiders are arthropods that can be distinguished from their closest relatives, the insects, by counting their legs. Spiders have 8, insects just 6.  ...  Here we show that spiders can be recognized directly from their degree sequences through the number of their legs (vertices with degree 1).  ...  The structure of P 4 -sparse graphs can be characterized in terms of so-called spiders [7, 8] . Hence, the cograph editing problem can be rephrased as a "spider editing problem".  ... 
doi:10.1007/s11786-015-0233-1 fatcat:fwws7fnkjne5zn2uvmmgxnafve

Page 332 of Exceptional Children Vol. 24, Issue 7 [page]

1958 Exceptional Children  
Good table manners can be practiced.  ...  They counted the legs of the one they saw in the pictures to find out if all the spiders have eight legs.  ... 

Correlation Between Segment Length and Spine Counts in Two Spider Species of Araneus (Araneae: Araneidae)

L. David Carmichael
1973 Psyche: A Journal of Entomology  
specimens had lost one leg); the length, of this segment was measured, and the number of spines o.n the segment was counted.  ...  Observations made on several hundred adult male spiders o.f two species o.f Araneus indicate a highly significant correlation (po.ooI) between rhe length of a segment (tibi.a o,f the second leg) and the  ...  Thus Beatty's assertion is correct for individual spiders; differences between left and right legs do seem to be due to developmental accidents, and quite independent of each other.  ... 
doi:10.1155/1973/47592 fatcat:cml45dhvvfbh3hz3vujqnb2gx4

Studies On Habit And Habitat, External Morphology, Feeding Capacity And Prey Preference Of Ant Spider, Myrmarachne (MAC LEAY) Orientalis (TIKADER)

S.N. Chaubey
2019 Indian journal of scientific research  
These spiders do not weave web. These prey on small and medium sized insects by direct jumping.  ...  Laboratory experiments were carried out to investigate habit and habitat, external morphology, preying capacity and prey preference of ant spider, Myrmarachne orientalis collected from different places  ...  This enables the spiders to jump without having large muscular legs like a grasshopper. Most jumping spiders can jump several times the length of their body.  ... 
doi:10.32606/ijsr.v10.i1.00027 fatcat:x3ht4ztu6nayzbdup4g3rsle6y

Studies on habit and habitat, external morphology, feeding capacity and prey preference of two striped spider, Telamonia dimidiata

S.N. Chaubey
2019 FLORA AND FAUNA  
Like other jumping spiders of family salticidae, these do not build webs and are sophisticated and active hunters. Telamonia dimidiata— recognisable by its distinctive two stripes on its back.  ...  This spider constructed a different web each night for three consecutive nights. "It is a cursorial hunter and does not use the web for hunting.  ...  Although spiders are often discussed based on their regional distribution -such as South Indian spiders and so on, they are not bound by these territories and can be found all over.  ... 
doi:10.33451/florafauna.v25i2pp204-208 fatcat:otajqs5aangdxfnzn3sposxawe

An observational study of ballooning in large spiders: Nanoscale multifibers enable large spiders' soaring flight

Moonsung Cho, Peter Neubauer, Christoph Fahrenson, Ingo Rechenberg, Laura Miller
2018 PLoS Biology  
From our observation, it seems obvious that spiders actively evaluate the condition of the wind with their front leg (leg I) and wait for the preferable wind condition for their ballooning takeoff.  ...  These quantitative values can explain large spiders' ballooning behaviors. Crab spiders use tens of nanoscale fibers for their aerial dispersal. In PLOS Biology | https://doi.  ...  Acknowledgments We would like to thank Jason Dunlop of the Naturkundemuseum Berlin for advice on spider identification. Many thanks to Robert B. Suter for the detailed explanation of his research. We  ... 
doi:10.1371/journal.pbio.2004405 pmid:29902191 pmcid:PMC6001951 fatcat:pvou7w3pgjbqxfwsuo57ze4gwa

Fishing Spider Cluster Configuration: An Energy- Efficient Wireless Sensor Clustering Method

2013 Sensors and materials  
This model performs self-organized clustering using local information and simple rules inspired by the behaviors and capabilities of the six-spotted fishing spider Dolomedes triton.  ...  Acknowledgements This work was supported by the Korea Research Foundation Grant funded by the Korean Government (KRF 313-2008-2-D01208)).  ...  As fishing spiders have a range of vibration-detecting organs, including very sensitive hairs (trichobothria) on their legs and feet, they can identify the source of the vibrations and also discern the  ... 
doi:10.18494/sam.2013.876 fatcat:ozboz532lfdznmojn66yhs4vru

Calculating structural complexity in phylogenies using ancestral ontologies

Martín J. Ramírez, Peter Michalik
2014 Cladistics  
These node ontologies are used to calculate a measure of complexity that can be traced on phylogenetic trees and is harmonious with usual phylogenetic operations.  ...  These ideas are applied to a real dataset of 166 araneomorph spider species scored for 393 characters, using Spider Ontology (SPD, https://bioportal.bioontology.org/ontologies/SPD); complexity scores and  ...  This study was supported by grants from ANPCyT PICT 1007, and CONICET PIP 3209 to M.J.R., and DFG Mi 1255/5-1 to P.M.  ... 
doi:10.1111/cla.12075 pmid:34772272 fatcat:cuwbhyhq3rawzn7us63msvafju

A new species of Australian funnel-web spider (Mygalomorphae, Atracidae, Hadronyche) redefines the family Atracidae

Paul M. Whitington, Kerri-Lee Harris
2021 Records of the Australian Museum  
We describe a new and unusual species of funnel-web spider from the far south coast of New South Wales.  ...  Introduction Funnel-web spiders are an iconic Australian taxon. Their fame and notoriety can be attributed to a single species, the Sydney funnel-web spider (Atrax robustus O. P.  ...  Atracidae can be distinguished from other mygalomorph spiders by the combination of the following characters: only 2 pairs of spinnerets, a relatively broad embolic shaft, large posterior sternal sigilla  ... 
doi:10.3853/j.2201-4349.73.2021.1779 fatcat:hz5lsinxuveyvb6h4hsxianp44

Page 25162 of Scientific American Supplement Vol. 61, Issue 1570 [page]

1906 Scientific American Supplement  
, the spiders being shaded by the nest.  ...  These transverse sticky lines, being eminently elastic, can be drawn out to ten times their ordinary length While there is work to he done, there is no standing still, no idleness; each individual appears  ... 

The Significance of the Courtship and Secondary Sexual Characters of Araneads

Thos. H. Montgomery, Jr.
1910 American Naturalist  
The male recognizes a female as such immediately onl touch; whether he recognizes her by sight alone I can not tell.  ...  He recognizes, her by contact, and taps her legs with his own. until she becomes quiet.  ... 
fatcat:7m4il7lglvbqli7txa6vdtyaza

The Significance of the Courtship and Secondary Sexual Characters of Araneads

1910 American Naturalist  
The male recognizes a female as such immediately onl touch; whether he recognizes her by sight alone I can not tell.  ...  He recognizes, her by contact, and taps her legs with his own. until she becomes quiet.  ... 
doi:10.1086/279127 fatcat:ilaue7jqufa7bi6ev2fiz5c5ma

Evolution of Social Behavior in Spiders (Araneae; Eresidae and Theridiidae)

ERNST J. KULLMANN
1972 American Zoologist  
Interattraction is the second attribute of social spiders. This urge for association can easily be demonstrated.  ...  It is known from certain species in eight families that they depend on living in communities throughout their life. Their behavior can be called "social."  ... 
doi:10.1093/icb/12.3.419 fatcat:2ca4nmcqtreedh5rthxoqfm6va

Teratological changes in postembryos of Eratigena atrica obtained by the application of alternating temperatures on spider embryos

Teresa Napiórkowska, Julita Templin, Paweł Napiórkowski
2021 PeerJ  
It has been confirmed in numerous laboratory experiments that abrupt temperature changes can be a powerful teratogenic factor.  ...  We selected six spiders to describe and analyze their morphological changes.  ...  As can be seen in Fig. 3A the spider had a complex anomaly, i.e., polymely and heterosymely of the walking legs on the right side of the prosoma (dorsal view).  ... 
doi:10.7717/peerj.11457 pmid:34131520 pmcid:PMC8174146 fatcat:l3hfmni3gzfj3jupdmwfp6zc2m
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