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ELONGATED PEDICILLATE SETAE: A PUTATIVE SENSORY SYSTEM AND SYNAPOMORPHY OF SPIDERS
 

Summary: ELONGATED PEDICILLATE SETAE: A PUTATIVE SENSORY
SYSTEM AND SYNAPOMORPHY OF SPIDERS
Ingi Agnarsson1,4
, Jonathan A. Coddington1
, and Laura J. May-Collado2,3
: 1
Systematic
Biology-Entomology, Smithsonian Institution, NHB-105, PO Box 37012, Washington,
DC 20013-7012, USA; 2
Florida International University, Department of Biological
Sciences, 11200 SW 8th Street, Miami Florida 33199, USA; 3
Universidad de Costa Rica,
Escuela de BiologiŽa, Apto. 2060 San Pedro, Costa Rica
ABSTRACT. We survey spiders from 43 families, 62 genera, and three arachnid outgroups for the presence
and diversity of elongated pedicillate setae (EPS)--a complex system of probably sensory setae hitherto
undocumented outside Theridiidae. Although not present in all spiders, these setae are sufficiently widespread
to suggest they are primitively present in the order. Because they are absent in related arachnids, they appear
to be a synapomorphy of spiders. Based on the morphology and orientation of these setae, it has been
suggested that they supplement abdominal slit sensilla in proprioception, documenting the position and
movement of the abdomen relative to the cephalothorax. Although still poorly known, the presence and

  

Source: Agnarsson, Ingi - Department of Biology, Universidad de Puerto Rico

 

Collections: Biology and Medicine