| Hibernaspis Temporal range: EarlyDevonian | |
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| Hibernaspis macrolepis | |
| Scientific classification | |
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| Family: | Hibernaspididae |
| Genus: | Hibernaspis |
| Type species | |
| Hibernaspis macrolepis Obruchev, 1939 | |
| Species | |
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Hibernaspis is agenus of extinctamphiaspididheterostracanagnathans whose fossils are restricted to Lower Devonian marine strata ofSiberia near theTaimyr Peninsula. In life, species ofHibernaspis were thought to be benthic animals that lived most of their lives mostly buried in the sediment of a series ofhypersaline lagoons. All amphiaspids are easily distinguished from other heterostracans in that all of the plates of the cephalothorax armor are fused into a single,muff-like unit, so that, in the case ofHibernaspis, the forebody of the living animal would have looked like a large guitar pic with serrated edges, with a pair of tiny, degenerated eyes, a pair of branchial openings for exhaling, and a simple, slit-like mouth at the anterior end.
There are two species ofHibernaspis,H. macrolepis, the type species, andH. tenuicristata. Each species differs from each other through shapes of the serrated edges, and micrornamentation of the cephalothoracic armor.[1]
 | This article about aprehistoric jawless fish is astub. You can help Wikipedia byexpanding it. |
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