Habronattus americanus groupWayne Maddison
This tree diagram shows the relationships between several groups of organisms.
The root of the current tree connects the organisms featured in this tree to their containing group and the rest of the Tree of Life. The basal branching point in the tree represents the ancestor of the other groups in the tree. This ancestor diversified over time into several descendent subgroups, which are represented as internal nodes and terminal taxa to the right.
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The americanus group includes some of the most colorful species of salticids. This primarily western group is recognized by the form of its palpus, the black first tarsus, and its remarkable ornaments on the face and palpi. In several of the named species (americanus, sansoni, tarsalis), there is strong geographic differentiation, to the extent that many more species may eventually be recognized in this group.
The americanus group has a distinctive palpus, both in having the bulb only slightly rotated counterclockwise from the condition in the related genus Pellenes, and in having a distinctively shaped tegular apophysis. In addition, the first legs are somewhat long and the tarsal area has a black scopula (see figure).
The ornaments consist of a typically fringed first leg, striped or colored cymbium, and high clypeus that may be striped, metallic blue or green, or otherwise colored. Long setae on the clypeus extend forward from the face, and setae around the front eyes often make an eyebrow or other tuft. Except for H. americanus and H. waughi, the latter of which reaches the Atlantic coast of Canada, all species are western.
Griswold, C. E. 1987. A revision of the jumping spider genus Habronattus F.O.P.-Cambridge (Araneae; Salticidae), with phenetic and cladistic analyses. University of California Publications, Entomology 107: 1-344.
University of British Columbia, Vancouver, British Columbia, Canada
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Citing this page:
Maddison, Wayne. 1995. Habronattus americanus group. Version 01 January 1995 (under construction). http://tolweb.org/Habronattus_americanus_group/3998/1995.01.01 in The Tree of Life Web Project, http://tolweb.org/