External Morphology of Thrips by M.Salman
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Transcript of External Morphology of Thrips by M.Salman
External Morphology of Thrips
Muhammad Salman34-E
Thrips
Order: Thysanoptera.
Family: Thripidae
Thrips are tiny, slender yellowish brown insects with fringed wings.
Hemimetabolous insects.
Thrips
External Morphology
HeadAntennae MouthpartsEyes
ThoraxWingsLegs
AbdomenAedeagusOvipositorSetae Spiracles
External Morphology of Thrips
External Morphology of Thrips
Head
Thrips External Morphology
Antennae
Antennae relatively short, 4- to 9-segmented.
Bead-like (moniliform) or filiform (in some )
The families of thrips are separated largely by the characters of the antennae, particularly the number of antennal segments and the nature of the sensoria on the third and fourth segments.
Antennae
Moniliform
Antennae
Filiform
Mouthparts
Rasping-Sucking Mouthparts Thrips have asymmetrical mouthparts that are
also unique to the group. The right mandible of thrips is reduced and
vestigial and in some species completely absent.
The left mandible is larger, and forms a narrow stylet used to pierce the cell wall of tissues.
Some species may then inject digestive enzymes as the maxillary stylets and hypopharynx are inserted into the opening to drain cellular fluids.
Mouthparts
This process leaves a distinctive silvery or bronze scarring on the surfaces of the stems or leaves where the thrips feed.
Eyes
Thrips has Compound Eyes.
Compound Eyes
Thorax
Thrips External Morphology
Wings
Two Pairs Strippy type. The wings are modified into strips or rod-
like structures & fringed with long hair.
Strap-like two pairs of wings nearly equal, and are very thin with little venation and a lot of hairs making a fringe around the edge, which is why they were named Thysanoptera.
Wings
Wings
Wings
Legs
All Three pairs are Ambulatory or Walking legs.
Tarsi 1-2-segmented, with 1-2 claws and are bladder-like at the end.
Legs
All pairs are Abmbulatory or walking legs
Legs
Abdomen
Thrips External Morphology
Abdomen
The abdomen is elongated and generally flattened dorso-ventrally, especially in the Tubulifera (Sub-order).
There are 10 distinctive segments with a rudiment of the 11th.
Aedeagus
The male genital organs are composed of paired appendages and an unpaired copulatory organ (aedeagus), all of which retract into the abdomen.
The paired testes and accessory glands with their ducts occur in the posterior half of the abdomen.
Aedeagus
Male Thrips
Aedeagus
Aedeagus
Aedeagus
Ovipositor
The female usually has an ovipositor composed of two pairs of sawlike blades.
There are eight egg sacs (ovarioles) and spherical, often pigmented, seminal receptacle for storage of sperm acquired during mating.
Ovipositor
Ovipositor
Ovipositor
Ovipositor
Setae
Often in the Tubulifera, several setae on the back are S-shaped and hook into the wing fringes to hold the wings at rest.
Setae
Spiracles
The first and eighth abdominal segments of Thrips bear breathing holes called Spiracles.
References Lewis Judson Stannard. Jr, Thrips, 2013,
http://www.britannica.com/EBchecked/topic/594043/thrips/39621/The-adult
Anonymous, Thysanoptera Thrips, 2013, http://www.discoverlife.org/mp/20q?search=Thysanoptera
Drees & Jackman, Order Thysanoptera – Thrips, 2013, http://bugguide.net/node/view/7754
Anonymous, Thrips, 2013, http://en.wikipedia.org/wiki/Thrips#Characteristics
John R. Meyer, Thysanoptera Thrips, 2013, http://www.cals.ncsu.edu/course/ent425/library/compendium/thysanoptera.html
Dr. Alton Stormy Sparks. Jr, Thrips, 2013, http://www.ent.uga.edu/veg/solanaceous/thrips.htm
THE END
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