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Variations in patterns of Poecilotheria pederseni

 
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Phalagorn
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Registreringsdatum: 13 mars 2006
Inlägg: 3970
Ort: Malmö, Skåne

InläggPostat: 2011-09-21 17:24:41    Rubrik: Variations in patterns of Poecilotheria pederseni

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Variations in patterns of Poecilotheria pederseni,
leg III & IV (femur, ventrally).

Stefan Phalagorn Bergström 2005


Summary
I have noticed that it occurs some variations at Poecilotheria pederseni, differences can be
seen through ventral side of leg III & IV. I discovered three different variations of captive bred
specimens from the same locality.

Introduction
In 2003, I got about 20 spiderlings of Poecilotheria pederseni by Nicolai Pedersen, a Danish spider enustiast who is also a good friend of mine, and the discoverer of Poecilotheria pederseni.
The species was described by P.J. Kirk in 2001 and named after N. Pedersen. In 2005 I managed to get the first egg sac of Poecilotheria pederseni in Sweden, which contained 97 spiderlings. Unfortunately no studies were made of my own offsprings.

Material examined
16 specimens was examined during their growth, subadult and adult specimens were used in this study. The specimens derived directly from Nicolai Pedersen. The specimens were captive born & bred and those were from his own specimens, which was collected in Yala National Park, Hambantota District in southern Sri Lanka.

During my studies I discovered that there were three different variations of the same species. I already noticed the difference when my spiders were juveniles. At first I thought patterns would change in their appearance depending on their growth and aging, but it seems that the adults keep their different variations on their femurs ventrally, leg III & IV.

Variation 1.
Leg III, femur - Black band on upper and lower part of femur with
complete black line all over. Big white fields at both sides of the black line.
Leg IV, femur - Black band on upper part of femur. At the lower part of
femur its an black triangle that are faded at the top. this triangle stops at the
half femur.

Poecilotheria pederseni, variation 1.


Variation 2.
Leg III, femur - Wide black band on upper and lower part of femur with
complete black line all over. Only small white spots at both sides of the black line.
Leg IV, femur - Black band on upper part of femur. At the lower part of
femur its an longer black triangle that are faded at the top. this triangle stops at about 2/3 of femur.

Poecilotheria pederseni, variation 2.


Variation 3.
Leg III, femur - Only a small white band at the upper part of femur.
The lower part of femur are entirely black.
Leg IV, femur - Wide black band on upper and lower part of femur. At the
lower part of femur the triangle is more like an straight line, this line reach all the
way up to the upper black band.

Poecilotheria pederseni, variation 3.


Variation 4.
Leg IV, femur - Femur is completely white, Nicolai Pedersen (pers. comm). Similar to leg IV in Poecilotheria formosa Pocock, 1899 (India). This variant has only been found in the wild and as far as
I know it does not exist in the pet trade.

Illustration showing differences of variation 1-3, leg III & IV. According to taxonomic illustrations of the description of Poecilotheria pederseni, Kirk 2001 there are major differences.



References
Kirk, P.J. 2001.
A new species of Poecilotheria (Araneae: Theraphosidae) from Sri Lanka. Journal of the British Tarantula Society 16(3): 77-88.
http://thebts.co.uk/forums/downloads.php?do=file&id=20&act=down

Rafn, S. 2004a.
Poecilotheria Simon, 1885. Pictorial key using ventral leg patterns.
http://www.fileden.com/files/2008/4/26/1884095/Poke%20ID.pdf

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