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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Members of this genus include small to moderately-sized mygalomorphs that build subterranean burrows with silken trapdoor entrances (Coyle, 1974; Coyle & Icenogle 1994). Of the 11 described species, 10 are restricted to California, with a single geographically-isolated species (A. isolatus) from mountains in central Arizona. These spiders are found in many different types of habitats, ranging from redwood forest to mesic oak woodland to xeric chaparral or high (Mojave) desert. Within these broader habitat types, spiders are generally found building burrows in sheltered microhabitats, including north-facing banks, ravines, shaded roadcuts, etc.
Coyle (1974, 1994) used a combination of morphological characteristics, habitat use and trapdoor architecture to understand species-level relationships in Aliatypus. These studies suggest that A. gulosus is the most early-diverging member of the genus - male and female genitalic features support this conclusion. The remaining species fall into 2 primary species groups, including the A. californicus group and the A. erebus group. The erebus group members possess large sternal sigilla, building relatively broad trapdoors on fairly shallow slopes. Members of the californicus group possess small sternal sigilla, building more narrow trapdoors on steeper slopes. The phylogenetic placement of Aliatypus thompsoni is uncertain, as this species shares features with both species groups.
Coyle, F.A., 1974. Systematics of the trapdoor spider genus Aliatypus (Araneae: Antrodiaetidae). Psyche 81, 431-500.
Coyle, F.A. 1994. Cladistic analysis of the species of the trapdoor spider genus Aliatypus (Araneae, Antrodieatidae). Journal of Arachnology 22:218-224.
Coyle, F.A. and W.R. Icenogle. 1994. Natural history of the California trapdoor spider genus Aliatypus (Araneae, Antrodiaetidae). Journal of Arachnology 22:225-255.
San Diego State University, San Diego, California, USA
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- First online 15 September 2008
- Content changed 15 September 2008
Citing this page:
Hedin, Marshal. 2008. Aliatypus http://tolweb.org/Aliatypus/129987/2008.09.15 in The Tree of Life Web Project, http://tolweb.org/. Version 15 September 2008 (under construction).