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Trilobites:
Trilobites were arthropods that mainly lived on or in the bottoms of the oceans, although some species probably swam around in the middle water layers. They evolved in the Cambrian and became extinct in the Permian. More than 15,000 different species are known, varying in length from 1 mm (0.04 in) to more than 60 cm (2 ft). They are called trilobites because their body, lengthwise, consists of three lobes. Widthwise we can also clearly distinguish three parts: the head (cephalon), the middle part (thorax), and the tail (pygidium). Just like modern arthropods such as crabs and lobsters, trilobites threw off their external chitin carapace (the so-called exoskeleton) when it became too small, after which they grew a newer, bigger one. A lot of trilobite fossils that are found are not the remains of the actual animal, but are the exoskeletons that, because of their hardness, fossilized relatively easily. Trilobites had compound eyes (just like modern insects), and were able to roll themselves up to protect their soft ventral side.
Bibliography:
Système silurien du centre de la Bohême. Vol. I, Recherches paléontologiques I: Trilobites, J. Barrande, 1852, Czech National Museum (Prague, Czech Rep.)
Trilobites, R. Levi-Setti, 1984 (2nd ed.), University of Chicago Press (Chicago, US)
Bohemian trilobites, M. Snajdr, 1990, Czech National Museum (Prague, Czech Rep.)
Trilobites: Fossils Illustrated, vol. 2, H.B. Whittington, 1992, Boydell Press (Ipswich, UK)
Trilobite! Eyewitness to evolution, R. Fortey, 2001, Flamingo Publ. (London, UK)
Trilobites of New York, T.E. Whiteley, 2002, Cornell University Press (Ithaca, US)

Please note that: the photos can be viewed in its original BIGGER size through
a copy/paste of the photo URL into your browser.


Microparia speciosa #MS0266
With nice Holochroal eyes containing a few hundred lenses and a nice Pigidium
Upper Ordovician (Ashgill)
, 450 million years old
Formation Kraluv Dur

Levin, Czech Republic
Size : 0.4 inch / 1 cm
Price: Euro 180.--
Above negative below detail of the eye
Acanthalomina minuta #AM0136
Pos/Neg
Silurian
, 420 million years old
Kosov, Czech Republic
Size : 0.44 inch / 1.1 cm
Price: Euro 45.--
Acanthalomina minuta #AM0138
Pos/Neg
Silurian
, 420 million years old
Kosov, Czech Republic
Size : 0.28 inch / 0.7 cm
Price: Euro 45.--
Acanthalomina minuta #AM0139
Multiple specimen
Silurian
, 420 million years old
Kosov, Czech Republic
Size : 0.28 inch / 0.7 cm
Price: Euro 40.--
Acanthalomina minuta #AM0140
Pos/Neg
Silurian
, 420 million years old
Kosov, Czech Republic
Size : 0.44 inch / 1.1 cm
Price: Euro 45.--
Acanthalomina minuta #AM0141
Pos/Neg
Silurian
, 420 million years old
Kosov, Czech Republic
Size : 0.4 inch / 1 cm
Price: Euro 
Acanthalomina minuta #AM0142
multiple specimen
Silurian
, 420 million years old
Kosov, Czech Republic
Size : 0.36 inch / 0.9 cm
Price: Euro 40.--
Paradoxides gracilis (2) #1698
and Stromatocystites pentagularis
Pos/Neg specimen, Nice specimen
Paradoxides gracilis zone
Middle Cambrian, 530 million years old
Jince, Czech Republic
Size centre trilo.: 6.8 inch / 13.5 cm
Size matrix.:  13.2-5.2 & 10.8-6 inch
                    / 33-13 & 27-15cm
Price: Euro 


Paradoxides gracilis #1650
Pos/Neg specimen, Superb and big specimen
Paradoxides gracilis zone
Middle Cambrian, 530 million years old
Jince, Czech Republic
Size trilo.: 6.8 inch / 17 cm
Price: Euro 630.-- 
Paradoxides gracilis #PG1648
Pos/Neg specimen
Paradoxides gracilis zone
Middle Cambrian, 530 million years old
Jince, Czech Republic
Size trilo.: 6 inch / 15 cm
Price: Euro 360.-- 
Paradoxides gracilis #1080
Pos/Neg specimen
Paradoxides gracilis zone
Middle Cambrian, 530 million years old
Jince, Czech Republic
Size plate: 8 by 6 inch / 20 by 15cm
Size trilo.: 4.4 inch / 11 cm
Price: Euro 170.-- 
Paradoxides gracilis #1082
Paradoxides gracilis zone
Middle Cambrian, 530 million years old
Jince, Czech Republic
Size plate: 7.2 by 8.8 inch / 18 by 22 cm
Size trilo.: 5.2 inch / 13 cm
Price: Euro 235.--
Naraoia longicaudata #AI430
RARE Soft Bodied Trilobite, showing Internal organs
M. Cambrian, 525 million years old
Chengjiang, China
Size : 0.2 inch / 0.5 cm
Price: Euro 110.--
Emuella dalganoi #AI459
RARE, Old Collection
L. Cambrian, 540 million years old
Kangaroo Island, South Australia
Size : 0.36 inch / 0.9 cm
Price: Euro 230.--
Emuella polymera #AI460
RARE, Old Collection, pos/neg
L. Cambrian, 540 million years old
Kangaroo Island, South Australia
Size : 0.68 inch / 1.7 cm
Price: Euro 260.--
Balcoracania dailyi #AI461
RARE, Old Collection
L. Cambrian, 540 million years old
Kangaroo Island, South Australia
Size : 0.28 inch / 0.7 cm
Price: Euro 
Paradoxides gracilis #1083
Paradoxides gracilis zone
Middle Cambrian, 530 million years old
Jince, Czech Republic
Size plate: 11.2 by 9.2 inch / 28 by 23 cm
Size trilo.: 5.8 inch / 14.5 cm
Price: Euro 325.--
Paradoxides gracilis #1084
Paradoxides gracilis zone
Middle Cambrian, 530 million years old
Jince, Czech Republic
Size plate: 6.8 by 6.4 inch / 17 by 16 cm
Size trilo.: 3.4 inch / 8.5 cm
Price: Euro 130.--
Raphiophorus roualti #1089
Pos/Neg
Silurian
, 420 million years old
Kosov, Czech Republic
Size trilo.: 0.44 inch / 1.1 cm
Price: Euro 75.-- ON HOLD
Trinucleoides reussi #1096
Ordovician, 450 million years old
Sarka, Prague, Czech Republic
Size trilo.: 0.52 inch / 1.3 cm
Price: Euro 45.--
Placoparia zippei #1097
Ordovician, 530 million years old
Sarka, Prague, Czech Republic
Size nodule.: 1 by 1.2 inch / 2.5 by 3 cm
Price: Euro 48.--
Ectillaenus sarkaensis #1202
Pos/Neg
Ordovician, 450 million years old
Sarka, Prague, Czech Republic
Size 
trilo.:  1.8 inch / 4.5 cm
Price: Euro 160.-- 
Ectillaenus sarkaensis #1205
Ordovician, 450 million years old
Sarka, Prague, Czech Republic
Size 
trilo.: 1 inch / 2.5 cm
Price: Euro 48.--
Reedops bronni #1207
Devonian
, 390 million years old
Damil U Tetina, Czech Republic
Size 
trilo.: 1 by 1.08 inch / 2.5 by 2.7cm
Price: Euro
Conocoryphe sulzeri #1214
Middle Cambrian, 530 million years old
Jince, Czech Republic
Size trilo.: 2.08 inch / 5.2 cm
Size matrix: 6 by 4 inch / 15 by 10 cm
Price: Euro 115.--
Acanthalomina minuta #1217
6 Specimen
Silurian
, 420 million years old
Kosov, Czech Republic
Size biggest trilo.: 0.24 inch / 0.6 cm
Price: Euro 72.--
Conocoryphe sulzeri #1221
Middle Cambrian, 530 million years old
Jince, Czech Republic
Size trilo.: 1.6 inch / 4 cm
Price: Euro 64.--
Conocoryphe sulzeri #1222
Middle Cambrian, 530 million years old
Jince, Czech Republic
Size trilo.: 1.52 inch / 3.8 cm
Price: Euro 72.--
Paradoxides gracilis #1223
4 specimen
Middle Cambrian, 530 million years old

Jince, Czech Republic
Size biggest trilo.: 1.04 inch / 2.6 cm
Size matrix: 4.8 by 5.2 inch / 12 by 13 cm
Price: Euro 96.--
Placoparia zippei #1224
Pos/Neg
Ordovician, 450 million years old
Sarka, Prague, Czech Republic
Size trilo.: 1.28 inch / 3.2 cm
Price: Euro 45.--
Placoparia zippei #1225
Pos/Neg
Ordovician, 450 million years old
Sarka, Prague, Czech Republic
Size trilo.: 0.88 inch / 2.2 cm
Price: Euro 48.--
Placoparia zippei #1226
Pos/Neg
Ordovician, 450 million years old
Sarka, Prague, Czech Republic
Size trilo.: 0.96 inch / 2.4 cm
Price: Euro 
Conocoryphe cirina #1231
Middle Cambrian, 530 million years old
Jince, Czech Republic
Size trilo.: 1.72 inch / 4.3 cm
Price: Euro 52.--
Otarion diffractum #1233
Silurian
, 420 million years old
Kosov, Czech Republic
Size trilo.: 0.76 inch / 1.9 cm
Price: Euro
Ectillaenus katzeri #1241
Pos/Neg
Ordovician, 450 million years old

Osek, Czech Republic
Size trilo.: 1.4 inch / 3.5 cm
Price: Euro 80.--

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