Mite, fastest runner of all land animals

This video (only about mammals, fish and birds; and absolute, not relative speed) is called Top Ten Fastest Animals In The World.

From the Experimental Biology congress in San Diego, California, USA:

Presentation Abstract

Presentation Title: Exceptional locomotory performance in Paratarsotomus macropalpis mites

Presentation Number: 878.1

Poster Board Number: A282

Presentation Time: Monday, Apr 28, 2014, 12:45 PM – 3:00 PM

Speaker(s): Samuel Y. Rubin1,2,3, Jonathan C. Wright2, Maria H. Young2, Dwight Whitaker2, Anna Ahn3

1Biology, Pitzer College, Claremont, CA,2Biology, Pomona College, Claremont, CA,3Biology, Harvey Mudd College, Claremont, CA

S.Y. Rubin: None. J.C. Wright: None. M.H. Young: None. D. Whitaker: None. A. Ahn: None.
Sponsoring Society: Physiology – The American Physiological Society (APS) – Sponsoring Society

Topic: 1103-APS Comparative muscle physiology, locomotion and behavior

Abstract: The Southern California erythracarid mite species, Paratarsotomus macropalpis, was filmed using a high frame-rate video camera in the field to analyze speed, stride frequency, acceleration and deceleration. We also recorded higher resolution lab footage of mites starting, stopping and turning to analyze gait and kinematic mechanisms. Mites running in the field on concrete substrates at high temperatures (40°C to 60°C) were shown to travel at mean relative speed of 192.4 bl s−1 (body lengths per second), exceeding the highest currently documented speed for land animals (171 bl s−1).

Despite this exceptional value, it conforms broadly with predictions based on interspecific scaling. Stride frequencies were also exceptionally high (as fast as 135 Hz), and increased significantly with substrate temperature. Mites accelerate and decelerate rapidly (mean values of 7.2 ms−2 and −10.1 ms−2, respectively), although the forces involved are simiilar [sic] to those found in other running animals.

Calculations show that air resistance is a minor contributor to deceleration; the forces are likely borne by a combination of muscle and cuticle ligament strain. During normal running, adjacent and opposite tarsi are 180 degrees out of phase. This gait cycle is preserved during turning, although the two front pairs of tarsi initiate acceleration cycles and duty factors increase for inner tarsi during turns.

See also here. And here.

A cheetah runs ‘only’ sixteen times its body length per second.

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8 thoughts on “Mite, fastest runner of all land animals

  1. Pingback: Dead animals help other animals survive | Dear Kitty. Some blog

  2. Pingback: New Dutch aquatic mite discovery | Dear Kitty. Some blog

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