Exotic Pet Owners Community
 
HomeExotic RealmFAQSearchRegisterLog in
*** Buy @ our Premium Members Petshop *** Early Bird's Feeders Shop / Norin's Lucky Gecko / Suave Dude Shop / Tattoo's Shop<-- ***
°º¤ø,¸¸,ø¤º°`°º¤ø,¸Welcome to Philippine Exotic Pets°º¤ø,¸¸,ø¤º°`°º¤ø,¸

Share | 
 

 Scorpion Anatomy

View previous topic View next topic Go down 
AuthorMessage
kenn21
Hall of Famer
Hall of Famer
avatar

Male
Posts : 320
Location Abu Dhabi UAE / Paete and Pakil, Laguna
Join date : 2010-11-09

PostSubject: Scorpion Anatomy   Tue Dec 14, 2010 5:23 pm

Scorpion Anatomy

[You must be registered and logged in to see this image.]
[You must be registered and logged in to see this image.]
[You must be registered and logged in to see this image.]
[You must be registered and logged in to see this image.]
[You must be registered and logged in to see this image.]

Legs
Till now terminology of the various sections of the appendages is still not standardised. Generally, the leg is divided into:
coxa (closest to sternum), trochanter, femur, patella, tibia (with tibial spur), basitarsus (with pedal spur distally for some) and tarsus. It ends with the pair of ungues (lateral claws) which has apotelle and dactyl (median claws) ventral to it.
Used for locomotry function and may be used to dig substrate and move baby scorpions (for females)

Pedipalps
The pedipalp is divided into:
coxa, trachanter, femur, patella, tibia and tarsus. The tibia and tarsus forms the chelae of the pedipalp. The pedipalp contains many hairs (setae). It is divided into 3 types of which; one type is sensory and named as trichobothria. The arrangement and number of trichobothria is unique to each genus and is used extensively to identify scorpions. The trichobothria are erectile and unidirectional in mobilty so that combined information of differently aligned trichobothria gives a spatial perception of disturbance in air current.
Used to grasp prey and for defense against predators. Also employed to grasp female chelae while mating.
Peculiar fact: No abduction muscle for tarsus. The abduction (for opening) of tarsus is thought to be partially due to increased hydrostatic pressure from dorsoventral contraction of opisthosoma. It's abduction is now thought to be mainly from the elastic nature of the fibres in the inflolded corium joining the tibia and the tarsus.

Pectens
Also known as the pectines. It is a peculiar gill like structure which some postulated to be remnants of the ancestral gills of the Silurian water scorpions.. This however has not been substantiated and pectens apparently is also present in euryterids (ancestral scorpions). It is found to be of sensory function. In most scorpions, it has mechano-receptors which is hypothesized to help the male choose suitable substrate for depositing spermatophore and sense surface vibrations. In some species, it is found to have some contact chemoreceptors. It is one of the most convenient means of determining sex. of some species.

Prosoma
Some wonder why the eyes are not included as part of the external morphology. Reason is simple. In cave dwelling (triglobitic) species like Sotanochactas elliotti , eyes are absent. In some other species, there can be up to 6 pairs of eyes! Besides the central eye group in the picture above, there may be a lateral eye group in the anterior lateral part of the prosoma. Also note that the chelicera is not its mouth but an appendages to aid feeding and grasping of food.

Chelicera
Divided into 3 segments: coxa, tibia (fixed finger), tarsus(movable finger). Used to grasp and crush prey before sucking it. Curiously, it does have an abduction muscle which is absent in the pedipalp. Pattern and shape is used extensively in differentiating the families.

Opisthosoma
The ventral carapace(sternite)and the dorsal carapace (tergite))of the mesosomal region is non-continuous while that in the metasomal (tail) is. The dorsal carapace is called tergite while the ventral is called sternite. They are joined by a whitish membrane called pleural membrane which would be stretched when the scorpion is very full or pregnant. The mesosoma is divided into 7 parts while the metasoma which becomes longer distally has 5 parts.

Sternum
Sternum is the junction where the coxa of most legs meet. The relative length and shape of the sternum is used extensively to differentiate the families. Pentagonal sternum is thought by some to be of a more primitive origin.

Genital Operculum
Genital operculum covers the reproductive organs of the scorpions (genital orifice of females). In the male, the genital operculum is usually partially or completely separate. A pair of genital papillae may protrude from the posterior part of the operculum for males of some species. This is another key sex dimorphism region.

Metasoma
The metasoma or the so-called 'tail' is divided into 5 true segments. Distal to the metasomal V is where the sting is and that is called the telson. There are generally 2 venom glands under voluntary control within the telson. The telson ends with a hypothermic needle like sting known as aculeus. I must re-emphasise that telson is not a true segment and do not belong to the segments of the opisthosoma. The telson itself is divided into two parts; the vesicle and the aculeus. In some species they are 'separated' by the subaculeus tubercle. This, however, is not present in genus Scorpionidae to which Heterometrus belongs.

Reference:
[You must be registered and logged in to see this link.]
Back to top Go down
View user profile
Tattoo
Administrator
Administrator
avatar


Male
Posts : 3535
Location Novaliches, Quezon City
Join date : 2009-02-21

PostSubject: Re: Scorpion Anatomy   Mon Dec 27, 2010 7:15 pm

very informative thumbs up


[You must be registered and logged in to see this link.]
|=|[You must be registered and logged in to see this link.]|=|[You must be registered and logged in to see this link.]|=|[You must be registered and logged in to see this link.]|=|
|=|[You must be registered and logged in to see this link.]|=|[You must be registered and logged in to see this link.]|=|
Back to top Go down
View user profile http://pep9.nstars.org/
 
Scorpion Anatomy
View previous topic View next topic Back to top 
Page 1 of 1
 Similar topics
-
» Scorpion Anatomy
» My first Scorpion!
» Just bought an emperor scorpion and looking for some advice
» [Info] Scorpion Facts
» Dropped my scorpion... in beer

Permissions in this forum:You cannot reply to topics in this forum
Philippine Exotic Pets :: General Discussion :: Exotics :: Scorpions :: Scorpion Care and Infos-
Jump to: