Spiders form the largest and most widely distributed order of class of animals called ARACHNIDA, which also includes the scorpions, harvestmen, false scorpions, mites and ticks. 

There are about 22,000 different species of spiders of which about 500 are British. The largest are found in Central America and have a body length of about 3.5 inches, the smallest species are less than a 25th of an inch long. 

Bodies of animals belonging to class Arachnida - consist of 2 parts here are two types of spiders  
1. ARANOMORPHAE or DIPNEUMONES, with one pair of lungs.
2. MYGALOMORPHAE or TETRAPNEUMONES, with two pairs of lungs.  

ARANOMORPHAE
1. They spin cobwebs in the air.
2. The poison glands and ducts are elongated and the claws move horizontally like pin.
3. Tarentula Hispanica

MYGALOMORPHAE
1. Always live in funnels and tubular holes in the ground. Some close this beautifully lined holes with a lid like a hinge door.
2. They have short glands and ducts and their fangs move vertically.
3. Tarentula Cubensis Mygale
 
More species belong to the Aranomorphae and they are called the true spiders or tarentulas (in the new nomenclature tarantula).  
Bodies of animals belonging to class Arachnida - consist of 2 parts
(a) The front - head and chest closely joined forming cephalothorax;
(b) The behind - the abdomen.

Greek Mythology 
In ancient Greece there lived a woman called Arachne who was famous for her skill in weaving. Her skill at her art made her very conceited, thinking that there was none better than her. In her conceit she challenged the Goddess Athene to a weaving contest. Arachne's effort was very beautiful and it aroused jealousy in Athene was felt threatened by Arachne. Athene was the goddess of all weaving. In her fit of rage she  tore Arachne's wearing to pieces. Arachne was very upset and she hung herself, where upon Athene changed her into a spider and condemned her to go on weaving forever. Hence, the name Arachnida which really means "Children of Arachne." 
The have a pair of jaws, a pair of pincer claws and 4 pairs of legs, all attached to the cephalothorax.
  
IMPORTANT MEDICINES 
1. Aranea Diadema
2. Aranea Ixolobo
3. Aranea Scinencia
4. Aranerum Tela (cobweb).
5. Latrodactus Hasselti
6. Latrodactus Kalipo
7. Latrodactus Mactans
8. Mygale Lasiodora
9. Tarentula cubensis
10.Tarentula Hispania
11.Theridion curassavicum.
 
PHYSICAL SYMPTOMS 
1) All spiders have marked action or blood giving a picture of blood poisoning and septicemia (septic fevers)
Fever Septic: Terent- c +++
Gen : Septicemia; Terentula, terent-c + 
2) Marked action on the central nervous system, 
q Anxiety,
q Trembling,
q Twitching,
q Restlessness,
q Oversensitiveness,
q Nervous prostration,
q Chorea and involuntary movements of single or group of muscles. 
 
Anxiety
Aran Sci +
Lat K +
Lat M +
Lat H +
Tarent H ++
Ther ++
Mygal +
Gen trembling ext (S) 
Aran +
Mygal +
Tarent his ++
Ther +++
Chorea
Mygal l +++
Tarent H +++
Lat K+
Taren C + 
Restlessness.
Always changing places cannot remain still, rolling from side to side in bed.  
Arania +
Arania Ixo +
Lat M +
Tarent H +++
Ther +
Mygal +
Oversensitiveness
Arania Ixo +
Tarentula +
Ther +++
Mygal L+ 
Prostration
Excessive weakness. Weakness from sexual excesses
Aran d++
Lat k +
Lat H +
Lat M+
TAR h +++
Tar C +
Ther ++
Mygal + 
Hysteria
Mygal +
Tarent H +++
Ther ++ 
3) "Instability" is the outstanding feature. Instability of action, purpose, wisdom, etc. 
4) Periodicity:- Symptoms recur annually.
   Also same hour (Aranea).
   Twenty first day. Tarent.++
   Tela araneurium + 
7) Affinity towards skin. Causing deep destruction of tissues.
Carbuncles Tarentula c ++
Burning, Tarentula c +++   
Actinomycosis,
Gangrene etc. Tarentula c + 
8) Modalities.
< Bright objects > Music
< Touch, noise, light > Rubbing
< Coition > Smoking.
< After or during menses 
9) Smoking amelioration
Tarentula h
Tarentula cu
Arania diadima
Arania ixodola.

10) Desires.
Alcoholic drinks- Ther +
Ashes - Tarentula hi +                  
Bananas – Theridion +
Cold drinks _ Tarentula his ++
Seasoned food- Tarentula h ++
Raw food- tarentula h +
Tobacco- ther+ 
Aversions.
Bread – Tarentula h +
Meat –  Ther +Tarentula h ++
Chocolate – Tarentula h +
Desire - Tarentula h + 

11) Sexual 
Sexual excitement ++. Lascivious. But aggravated coition - leading to sadness, weakness, dyspnoea etc.
12) Rapidity of onset of symptoms. 
Doctrine of Signature:-
A spider attacks suddenly and disappears before the victim can react. This explains the sudden onset of symptoms. 

12) MENTAL SYMPTOMS 
Spiders stay in burrows, holes and light and Aversion to society are marked mental symptoms. 
Selfish, cunning, whimsical and quarrelsome. 
Contrariness, within himself as well as to outer circumstances. Obstructive, interfering. 
Great aversion to bright light, objects, colour, etc. 
< Contradiction. A/F Contradiction 
Music, sensitive to +3 . All complaints react to music not only mental, but physical symptoms also > Music. 
Contrariness. Cheerfulness or gaiety alternating with Anger, irritability. Aversion to company but wants someone present nearby. 
Hysterical. Causeless weeping, feigning and malingering. 
All mental symptoms ameliorated by eating. walking).  

13) DREAMS OF SPIDERS, 
(1) Tarentula hispanica 
Animals
Animals wild
Animals pursuing him
Bulls pursuing him
Business
Contempt
Danger
Dead bodies
Death
Horse falling from horse
Insults (abused)
Long
Many (dreaming)
Misfortune (accidents, disaster, events, unfortunate, loss)
Pleasant (joyous, peaceful, quiet, wonderful)
Pleasant after 2 h.
Pursued being animals by
Pursued, being, bulls by
Remembered
 
(2) Theridion 
Body parts of teeth breaking off
Disease teeth breaking off
Horses
Horse riding
Journeys (difficulties, foreign country)
Journeys horse back, on
Many
Riding
Teeth breaking off 
(3) Mygale
Absurd (strange)
Ludicrous 
(4) Aranea Diadema
Frightful (anxious)

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