Фотошоу очаровательной Dakota A Ormia

Фотошоу очаровательной Dakota A Ormia

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Affiliation

1 Integrative Behaviour and Neuroscience Group, Department of Life Sciences, University of Toronto at Scarborough, 1265 Military Trail, Scarborough, Ontario, Canada M1C 1A4. amason@utsc.utoronto.ca

Andrew C Mason et al.

J Exp Biol .

2005 Dec .

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1 Integrative Behaviour and Neuroscience Group, Department of Life Sciences, University of Toronto at Scarborough, 1265 Military Trail, Scarborough, Ontario, Canada M1C 1A4. amason@utsc.utoronto.ca

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Broder ED, Gallagher JH, Wikle AW, Venable CP, Zonana DM, Ingley SJ, Smith TC, Tinghitella RM.
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Witney AG, Hedwig B.
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Ormia ochracea (Diptera, Tachinidae) are acoustic parasitoids of crickets that have one of the most directionally sensitive auditory systems known. We studied dynamic characteristics of walking phonotaxis in these flies in response to variations in sound source azimuth, and compared phonotaxis of flies in freely walking conditions to tethered flies walking on a treadmill. Motor patterns at the initiation of phonotaxis are not stereotyped even for similar stimulus conditions. Flies respond to directional sound sources by walking in a tight curve that combines rotation and forward translation until they are oriented towards the source direction, then continue on a straight path. Translational velocity accelerates throughout the duration of the stimulus then decelerates following stimulus offset. In contrast, rotational velocity accelerates and then decelerates within the duration of the stimulus such that flies have completed the rotational component of the response and reached their final heading before the end of the stimulus. Rotational velocity is the only response parameter that varies systematically with sound source direction (azimuth). Differences in the amplitude of rotational velocity as a function of source azimuth determine the directional orientation of phonotactic responses. The relationship between rotational velocity and source azimuth is similar to a neural measure of auditory directionality (interaural latency). There were some differences between freely walking and tethered conditions, although both showed qualitatively similar responses. Flies accelerated more slowly and attained lower maximum velocities on the treadmill, consistent with the greater inertia of the treadmill sphere relative to the flies. Also, flies tended to continue walking longer on the treadmill following cessation of the stimulus.

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Eerie Cricket Thingy
Sat, Nov 8, 2008 at 11:07 AM
Yesterday a mysterious reddish-brown pill shaped object suddenly began emerging from the underside of one of our pet crickets. Looks like some sort of egg, but from what we can tell, cricket eggs don’t look like this. The cricket seemed healthy before this emerged, and was alive for a while when it first appeared, but now is dead. Could it be that some other insect such as a wasp laid its eggs inside the cricket as a host? I’ve heard of them doing this to caterpillars, but crickets? Or is it something else?
Paul and Stella
Los Angeles
Unknown Cricket Parasite: Tachinid Fly???
Hi Paul and Stella,
This is a new one for us and we will need to do some research. We will also try to contact Eric Eaton to see if he has an opinion. We, like you, suspect this is some type of internal parasite that has had its meal and is perhaps pupating outside the cricket’s body. It would be interesting to see what, if anything, eventually emerges. If we were betting, we would bet on a Tachinid Fly. Moments after we posted, we found an online article on a Tachinid Fly , Ormia ochracea, that parasitizes crickets.

Unknown Cricket Parasite: Tachinid Fly???
Hi, Daniel:
The object protruding from the deceased cricket is indeed a fly puparium (the rigid last larval ‘skin’ enclosing a fly pupa). It could certainly be a tachinid fly, but there are also other flies that are parasitic on crickets, especially some members of the flesh fly family (Sarcophagidae). I’d personally be hard-pressed to identify even the adult fly once it emerges, though a dipterist (fly expert) could.
Eric
Update: November 18, 2012
Thanks to a comment just made by a reader with experience in Tachinid Flies, we are confident to report that this pupa belongs to the Tachinid Fly Ormia ochracea . This Cornell University article tells the fascinating account of this Tachinid Fly that uses sound to locate its host when the male Crickets call to attract females.
I would be willing to bet a buck that this pupae belongs to Ormia ochracea, a tachinid fly occurring across the southern US and into central america. The appearance of the pupae (color, surface, size) matches O. ochracea perfectly, and the host looks right. I did my master’s research on this species, and am still quite fond of it:)
Thanks for your comment. Based on your credentials, which are much more impressive than our own, we defer to your knowledge and we will update the post with your identification. Thanks again for the input.
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