Pliomera

Pliomera Temporal range: Middle Ordovician PreꞒ Ꞓ O S D C P T J K Pg N
Pliomera fischeri
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Trilobita
Order:	Phacopida
Suborder:	Cheirurina
Family:	Pliomeridae
Genus:	Pliomera Angelin, 1852
Species
P. fischeri (Eichwald, 1825) (type species) synonyms Asaphus fischeri, Calymene polytoma, C. frontiloba P. fischeri fischeri P. fischeri asiatica Chugaeva, 1964 P. anderkensis Weber, 1948 P. brevicapitata (Lamansky, 1903) P. iliensis Koroleva, 1959 P. ingsanigensis Reed, 1906 P. mathesii Angelin, 1854 P. pseudoarticulata Reed, 1910 P. tmetophrys Harrington & Leanza, 1957
Synonyms
Amphion Pander, 1830, non Amphion Hubner, 1816 (the Nessus sphinx, a hawkmoth)

Pliomera is a genus of trilobites that lived during the Middle Ordovician on the paleocontinent Baltica, now Norway, Sweden, Estonia and the Russian Federation, and in Argentina. It can be recognized for its pentagonal glabella widest between the frontal corners, with an inverted V-shaped occipital ring. In front of the occipital furrow that crosses the entire glabella, two pairs of dead-ending furrows create three side lobes left and right. The front of the glabella also has three dead-ending furrows, a very short one on the midline and left and right a longer one, directed inward and slightly backward. The eyes are small and are not connected to the glabella by an eye ridge. The thorax and pygidium are very regularly divided into up to 23 rather narrow segments, without a furrow within each of the pleurae. The pleurae are clearly wider than the axis. The pygidium ends in downward pointing toothlike spines.