VETERINARY ENTOMOLOGY (6-9) Flashcards
What is entomology?
It is the study of arthropods and allied insects, (Phylum Arthropoda).
These are bilaterally symmetrical animals whose body is divided into segments which bear jointed appendages (legs, antennae, mouthparts, etc.)
ARTHROPODS
Some jointed appendages of an arthropods
LEGS, ANTENNAE, MOUTHPARTS
Groups under the Phylum arthropoda
- PARASITIC INSECTS
- PARASITIC ARACHNIDS
- PENTASTOMIDA OR TONGUE WORMS
- PARASITIC CRUSTACEANS
Greek word “arthros” meaning
JOINT
Greek word “podos” meaning
FOOT
Largest group.
Adults with 3 pairs of legs.
Body divided into 3 main parts (head, thorax, & abdomen).
PARASITIC INSECTS
What are the 3 main parts of the body of the Parasitic Insects?
HEAD, THORAX, ABDOMEN
Example of Parasitic Insects
MOSQUITOES
FLIES
LICE
Body parts joined together.
Adults with 4 pairs of legs,
2 pairs of mouthparts without antennae and wings
PARASITIC ARACHNIDS
Adults are worm-like, cylindrical without legs except 2 pairs of hooks near the mouth.
Larvae with 2 pairs of legs.
PENTASTOMIDA OR TONGUE WORMS
Example of Pentastomida of Tongue Worms
Linguatula serrata
Porocephalus sp.
Main body divisions are cephalothorax and abdomen.
Legs are found on thoracic and abdominal segments.
PARASITIC CRUSTACEANS
Main body divisions of Parasitic Crustaceans
CEPHALOTHORAX & ABDOMEN
In Parasitic Crustaceans, legs are found where?
THORACIC AND ABDOMINAL SEGMENTS
These are small animals.
Its whole body is divided into head, thorax, and abdomen.
3 pairs of legs attached to the thorax and 2 pairs of wings attached to the 2nd and 3rd thoracic segments.
INSECTS
An insects have 3 pairs of legs attached to the _______ and 2 pairs of wings attached to the ____________.
THORAX
2nd AND 3rd THORACIC SEGMENTS
3 segments of the thorax of the insects
PRO-
MESO-
METATHORAX
Wings with hollow tubes
VEINS
Used for identification
WING VENATION
The surface layer of the body of the insect is called ______ which is more or less rigid than exoskeleton?
INTEGUMENT OR BODY WALL
The hardened portion of the body wall is due to deposition of this substance.
CHITIN
Each segment of the body of an insect is composed of these areas known as sclerites.
DORSAL, LATERAL & VENTRAL AREAS OR WALL
Sclerites are separated from each other by what?
SUTURES
3 types of Sclerites
DORSAL SCLERITE or WALL
LATERAL SCLERITE
VENTRAL SCLERITE
Dorsal sclerite or wall
TERGUM / NOTUM
Lateral sclerite
PLURITES / PLEURON
Ventral sclerites
STERNUM / STERNITES
All insects possessing mouth parts capable of piercing the skin of animals should be regarded as __________ of micro parasites, bacteria, viruses and rickettsias.
POTENTIAL VECTORS
Insect mouth parts may be classified into:
A. MANDIBULATE - Chewing
B. HAUSTELLATE- Sucking
C. PIERCING
D. NON-PIERCING
Mandibulate
CHEWING
Haustellate
SUCKING
Insects as vectors, they may act as what?
INTERMEDIATE HOST, CARRIERS / TRANSPORT HOST
The feeding habits of insects greatly contribute to the effectiveness of disease transmission. Give an example
INTERMITTENT HABIT OF FEEDING BY TABANIDS - T. evansi, Musca autumnalis - Thelazia rhodest and Mycobacterium bovis (cause of pink eye)
Cause of pink eye
Mycobacterium bovis
What are the most obvious distinguishing characteristics of insects?
JOINTED APPENDAGES
MOUTH PARTS
ANTENNAE
Internally, there is a _____________ instead of a body cavity
HEMOCOELE
This consists of ganglia in each segment of the body.
The ganglia are connected to each other by ____________.
__________ arise from each ganglion and innervate the body organs.
NERVOUS SYSTEM
NERVE FIBERS
NERVES
the blood vessels are very simple, consisting of a _________ beneath the notum.
SINGLE DORSAL
blood admitted to the heart thru this part and is forced forward to the head then to the rest of the body organs.
LATERAL VALVES
The blood consists of what?
WATER FLUID (SERUM OR PLASMA)
WHITE CORPUSCLES
Components of blood usually colorless or greenish yellow
WHITE CORPUSCLES
insects have no lungs, but breath through a system of tubes, the ___________ which extends to all parts of the body thru smaller branches (____________) bringing fresh air and carrying _______.
TRACHEA
(TRACHEOLES)
CO2
Tracheal tubes have openings on each side of the thoracic and abdominal segments called ___________.
SPIRACLES OR STIGMATA