Life reconstruction of Phantaspis auritus at different ontogenetic stages。（Image source： Zhixin Sun ， CC BY-SA 4.0 ） Age Cambrian（Wuliuan） 509-504 Ma Taxonomy Kingdom: Animalia Phylum: Arthropoda Class: Trilobita Order: Ptychopariida Genus: Phantaspis Species: Phantaspis auritus Morphological description In the mudstone layers of the Honghe Member from the middle Cambrian of Shandong, a distinctive trilobite was discovered, named Phantaspis auritus . In adult individuals,

Reconstruction of Ogygopsis klotzi （Image source：PaleoEquii， CC BY-SA 4.0 ） Age Cambrian（Wuliuan） 505 Ma Taxonomy Kingdom: Animalia Phylum: Arthropoda Class: Trilobita Order: Corynexochida Family: Dorypygidae Genus: Ogygopsis Species: Ogygopsis klotzi Morphological description Ogygopsis klotzi can reach a body length of up to 13 cm. Its overall outline is oval in shape, with a crescent-shaped cephalon. The thorax consists of eight segments. The pygidium is exceptionally la

Fossil specimen of Heliopeltis johnsoni （Image source：Bob's Fossils， CC BY 4.0 ） Age Devonian（Eifelian） 388 Ma Taxonomy Kingdom: Animalia Phylum: Arthropoda Class: Trilobita Order: Corynexochida Family: Scutelluidae Genus: Heliopeltis Species: Heliopeltis johnsoni Morphological description Heliopeltis johnsoni has a body length of approximately 5.5 cm. The glabella is prominently raised. Each eye lobe bears two spines of unequal size, one large and one small. The genal spi

Reconstruction of Redlichia rex , Image source：Katrina Kenny Age Cambrian（"Stage 4"） 514 Ma Taxonomy Kingdom: Animalia Phylum: Arthropoda Class: Trilobita Order: Redlichiida Family: Redlichiidae Genus: Redlichia Species: Redlichia rex Morphological description Redlichia rex is a very large trilobite, reaching a maximum body length of approximately 30 cm. It possesses prominent genal spines, a thorax composed of 15 segments, and a relatively small pygidium. Fossil specimen of

Fossil specimen of Redlichia chinensis （Image source：Dwergenpaartje， CC BY-SA 3.0 ） Age Cambrian（"Stage 4"） 514 Ma Taxonomy Kingdom: Animalia Phylum: Arthropoda Class: Trilobita Order: Redlichiida Family: Redlichiidae Genus: Redlichia Species: Redlichia chinensis Morphological description Redlichia chinensis is a relatively large trilobite, reaching up to 7.5 cm in length. The cephalon is broad, with long genal spines. The thorax consists of 15 segments, with the eleventh

Fossil specimen of Emuella dalgarnoi Paterson, J., Edgecombe, G. E. (2006) Age Cambrian（"Stage 3"） 521 Ma Taxonomy Kingdom: Animalia Phylum: Arthropoda Class: Trilobita Order: Redlichiida Family: Emuellidae Genus: Emuella Species: Emuella dalgarnoi Morphological description Emuella dalgarnoi has a cephalon that is roughly pentagonal in outline, with a semicircular cranidium and well-developed genal spines. The prothorax consists of six segments, with the sixth segment bearin

Fossil specimen of Emuella polymera （ Image source： Dave Simpson ， CC BY 4.0 ） Age Cambrian（"Stage 3"） 521 Ma Taxonomy Kingdom: Animalia Phylum: Arthropoda Class: Trilobita Order: Redlichiida Family: Emuellidae Genus: Emuella Species: Emuella polymera Morphological description Emuella polymera has a cephalon that is roughly pentagonal in outline, with a semicircular cranidium and well-developed genal spines. The prothorax consists of six segments, with the sixth segment b

Fossil specimen of Balcoracania dailyi （ Image source： Dave Simpson ， CC BY 4.0 ） Age Cambrian（"Stage 3"） 521 Ma Taxonomy Kingdom: Animalia Phylum: Arthropoda Class: Trilobita Order: Redlichiida Family: Emuellidae Genus: Balcoracania Species: Balcoracania dailyi Morphological description Balcoracania dailyi has a semicircular cephalon with relatively well-developed genal spines. The prothorax consists of six segments, with the sixth segment bearing a distinct pleural spin

Fossil specimen of Yunnanocephalus yunnanensis （Image source：Dwergenpaartje， CC BY-SA 3.0 ） Age Cambrian（"Stage 3"） 521 Ma Taxonomy Kingdom: Animalia Phylum: Arthropoda Class: Trilobita Order: Redlichiida Family: Yunnanocephalidae Genus: Yunnanocephalus Species: Yunnanocephalus yunnanensis Morphological description Yunnanocephalus yunnanensis is a small trilobite, reaching approximately 2 cm in length. The body is anteriorly broad and gradually tapers posteriorly, giving i

Fossil specimen of Estaingia bilobata （Image source：PAR， CC BY 4.0 ） Age Cambrian（"Stage 4"） 514 Ma Taxonomy Kingdom: Animalia Phylum: Arthropoda Class: Trilobita Order: Redlichiida Family: Estaingiidae Genus: Estaingia Species: Estaingia bilobata Morphological description Estaingia bilobata is a small trilobite, reaching about 2 cm in length. The genal spines are of moderate length. The thorax consists of 13 segments, with relatively short pleural spines. The pygidium is

Fossil specimen of Peachella brevispina , Image source：Mark Webster Age Cambrian（"Stage 4"） 514 Ma Taxonomy Kingdom: Animalia Phylum: Arthropoda Class: Trilobita Order: Redlichiida Family: Olenellidae Genus: Peachella Species: Peachella brevispina Morphological description Peachella brevispina is a medium-sized trilobite, reaching approximately 3.5 cm in length. The cephalon is semicircular, with a columnar glabella. The genal spines are broad but relatively short. The third

Reconstruction of Peachella iddingsi （Image source：Apokryltaros， CC BY-SA 3.0 ） Age Cambrian（"Stage 4"） 514 Ma Taxonomy Kingdom: Animalia Phylum: Arthropoda Class: Trilobita Order: Redlichiida Family: Olenellidae Genus: Peachella Species: Peachella iddingsi Morphological description Peachella iddingsi is a medium-sized trilobite, reaching approximately 3.5 cm in length. The cephalon is semicircular in shape, and the glabella is columnar. The genal spines are broad and infl

Reconstruction of Olenelloides armatus （Image source：Nobu Tamura， CC BY-SA 4.0 ） Age Cambrian（"Stage 4"） 514 Ma Taxonomy Kingdom: Animalia Phylum: Arthropoda Class: Trilobita Order: Redlichiida Family: Olenellidae Genus: Olenelloides Species: Olenelloides armatus Morphological description Olenelloides armatus is a small trilobite, reaching a maximum body length of about 1 cm. Its exoskeleton is narrow and elongated. The cephalon is hexagonal in outline, with a spine projec

Waukeshaaspis eatonae fossil（Image source：Kennethgass， CC BY-SA 4.0 ） Age Silurian（Telychian） 435 Ma Taxonomy Kingdom: Animalia Phylum: Arthropoda Class: Trilobita Order: Phacopida Family: Dalmanitidae Genus: Waukeshaaspis Species: Waukeshaaspis eatonae Morphological description Waukeshaaspis eatonae is a medium-sized trilobite with noticeable variation among individuals. The average body length is approximately 6 cm. The cephalon is semicircular in shape, and the genal s