The hypostome is the hard mouthpart of trilobites found on the ventral side of the cephalon (head). The hypostome can be classified into three types based...

exit for the molting trilobite. It is absent in some trilobites like Lachnostoma. The hypostome is the hard mouthpart of the trilobite found on the ventral...

up hypostome in Wiktionary, the free dictionary. In zoology, the hypostome can refer to structures in distinct animal groups: Hypostome (trilobite), the...

occasionally the hypostome, a small rigid plate comparable to the ventral plate in other arthropods. A toothless mouth and stomach sat upon the hypostome with the...

trilobites and their close relatives. The group is united by several morphological characters, including reduced or absent lateral eyes, a hypostome with...

Proetida is an order of trilobite that lived from the Ordovician to the Permian. It was the last surviving order of trilobite, dying out in the Permian-Triassic...

Desmarest (1817), sometimes erroneously spelled blumenbachi, is a species of trilobite discovered in the limestone quarries of the Wren's Nest in Dudley, England...

line with the eyes. The hypostome is almost flat and kidney-shaped and has a poorly defined central body. "Largest Trilobites". Sam M. Gon III. 2005-08-17...

Librostoma is a subclass of trilobites defined by having a natant hypostome, which is a hypostome (mineralized trilobite mouthpart) that is free from the...

Eldredgeops rana (formerly Phacops rana) is a species of trilobite from the middle Devonian period. Their fossils are found chiefly in the northeastern...

Eodiscina is trilobite suborder. The Eodiscina first developed near the end of the Lower Cambrian period (late Atdabanian) and became extinct at the end...

not illustrated until 1847, when they were interpreted as the hypostome of the trilobite Prionocheilus. Antonin Fritsch was the first to formally describe...

Phacopida ("lens-face") is an order of trilobites that lived from the Late Cambrian to the Late Devonian. It is made up of a morphologically diverse assemblage...

Dalmanites is a genus of trilobite in the order Phacopida. They lived from the Late Ordovician to Middle Devonian. The trilobites of this genus have slightly...

Emucarididae is an extinct family of soft-shelled trilobite-like arthropods (nektaspids) from the Lower Cambrian of South Australia and South China. It...

Trimerus is an extinct genus of trilobite in the family Homalonotidae. Trimerus is one of North America's largest trilobites, reaching over 20 cm (7.9 in)...

Calymene celebra is a Silurian species of trilobites of the order Phacopida and also the state fossil of Wisconsin. It is found in Illinois, Indiana, and...

Saperion is an extinct genus of trilobite-like arthropod. It lived during the late Atdabanian stage, which lasted from 521 to 514 million years ago during...

is an order of trilobites, a group of extinct marine arthropods. Species assigned to the order Redlichiida are among the first trilobites to appear in the...

anterior pair of appendages in trilobites. In O. serratus, these are attached about halfway the immediately adjacent to the hypostome, and appear from the dorsal...

Hypodicranotus striatulus is an extinct, pelagic trilobite in the order Asaphida, of the family Remopleuridae. Its fossils are found in Middle Ordovician-aged...

Flexicalymene Shirley, 1936. is a genus of trilobites belonging to the order Phacopida, suborder Calymenina and Family Calymenidae. Flexicalymene specimens...

away from the trilobites, although he later described a second species of Cyclus which was later recognised as the hypostome of a trilobite. Cycloids were...

Aulacopleura is a genus of proetid trilobite that lived from the Middle Ordovician to the Middle Devonian. Some authors may classify this group as subgenus...

[ˌvɪvəzˈæspɪs]) (meaning "Veevers' shield") is an extinct genus of bathyurid trilobite from the Nambeet Formation in Western Australia. The type species is M...

Colpocoryphe is a genus of trilobites in the family Calymenidae. Convex Cephalon Trapezoidal glabellae, frequently distinctly furrowed and surelevated...

first harpetid trilobites appear in the Upper Cambrian, and the last species die out at the end of the Devonian period. Harpetid trilobites are characterized...

uralicum † Maksimova, 1979 Schematic Trilobite Bojoscutellum paliferum (Beyrich, 1845). A) cephalon B) hypostome C) pygidium D) width of pygidium Biolib...

Odontochile is a genus of trilobites in the order Phacopida, family Dalmanitidae. These trilobites were fast-moving low-level epifauna and detritivore...

Metacalymene is a genus of trilobites in the order Phacopida, family Calymenidae. This genus is considered monotypic, containing only the type species:...