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Molecular systematics and running ab...

Spagna, Joseph Clement.

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Molecular systematics and running ability in grass spiders (Araneae: Agelenidae) and their kin.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Molecular systematics and running ability in grass spiders (Araneae: Agelenidae) and their kin./
作者:	Spagna, Joseph Clement.
面頁冊數:	204 p.
附註:	Adviser: Rosemary G. Gillespie.
Contained By:	Dissertation Abstracts International67-08B.
標題:	Biology, Entomology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3228495
ISBN:	9780542826627

Molecular systematics and running ability in grass spiders (Araneae: Agelenidae) and their kin.
Spagna, Joseph Clement.

Molecular systematics and running ability in grass spiders (Araneae: Agelenidae) and their kin. - 204 p.

Adviser: Rosemary G. Gillespie.

Thesis (Ph.D.)--University of California, Berkeley, 2006.

The Agelenidae (Koch 1837), commonly called grass-spiders or funnel-web spiders, are a diverse and widely-distributed group of medium-sized web-building generalist predators, and their taxonomic history is outlined in Chapter 1. In Chapter 2, molecular data from nuclear and mitochondrial genes totaling 3500 base pairs, are used to develop a phylogenetic hypothesis for three-clawed lineages in the RTA clade, focusing on the Agelenidae. Results reveal a robust agelenid clade that includes the subfamilies Ageleninae, Tegenariinae, and Coelotinae. The sister group of the agelenid clade is a clade including exemplars of several families, including Amaurobiidae, Dictynidae, Cybaeidae, and Desidae, but this group is less well-supported. The well-supported Agelenid group (representing >800 species) shares a common foraging style, web-type, and spinneret morphology.

ISBN: 9780542826627Subjects--Topical Terms:

1018619
Biology, Entomology.

Molecular systematics and running ability in grass spiders (Araneae: Agelenidae) and their kin.
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245 1 0 $a Molecular systematics and running ability in grass spiders (Araneae: Agelenidae) and their kin.
300 $a 204 p.
500 $a Adviser: Rosemary G. Gillespie.
500 $a Source: Dissertation Abstracts International, Volume: 67-08, Section: B, page: 4217.
502 $a Thesis (Ph.D.)--University of California, Berkeley, 2006.
520 $a The Agelenidae (Koch 1837), commonly called grass-spiders or funnel-web spiders, are a diverse and widely-distributed group of medium-sized web-building generalist predators, and their taxonomic history is outlined in Chapter 1. In Chapter 2, molecular data from nuclear and mitochondrial genes totaling 3500 base pairs, are used to develop a phylogenetic hypothesis for three-clawed lineages in the RTA clade, focusing on the Agelenidae. Results reveal a robust agelenid clade that includes the subfamilies Ageleninae, Tegenariinae, and Coelotinae. The sister group of the agelenid clade is a clade including exemplars of several families, including Amaurobiidae, Dictynidae, Cybaeidae, and Desidae, but this group is less well-supported. The well-supported Agelenid group (representing >800 species) shares a common foraging style, web-type, and spinneret morphology.
520 $a The Agelenidae are well-represented in Holarctic faunas. In Chapter 3, cladistic analyses of molecular characters from North American agelenid genera support an ancient radiation of grass-spiders endemic to Western North America. Data from three genes was analyzed, with the CO1 gene providing support for relationships between the genera and species and the 16S gene providing some resolution between the deeper nodes in the tree. A new subtribe of Agelenopsini, Calilenina tax. n. is proposed, comprised of the genera Calilena, Hololena, Rualena, and Novalena.
520 $a The remarkable speeds attained by Agelenidae during horizontal running (>50 body lengths per second) make their biomechanics worthy of study. The spiders use an "alternating tetrapod" gait while running which does not change with surface type. The spider gait is characterized biomechanically as a "fast trot" based on speed, leg phase, and duty factor, and at high speeds achieves an aerial phase, unusual in arthropods. This demonstrates that some spiders are capable of a dynamically stable gait that utilizes kinetic energy to bridge gaps in irregular substrates.
520 $a In Chapter 5, the structure of the 18S rRNA sequence from Hyptiotes gertschi is described, which is the largest 18S gene sequenced in any arachnid to date. This remarkable sequence is compared to those of other arachnids, to develop base-pairing models of its insert regions and to address methodological problems caused by unusual sequences.
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650 4 $a Biology, Entomology. $3 1018619
650 4 $a Biology, Genetics. $3 1017730
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710 2 0 $a University of California, Berkeley. $3 687832
773 0 $t Dissertation Abstracts International $g 67-08B.
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