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Pipiscius

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Extinct genus of lampreys

Pipiscius Temporal range:Moscovian (Middle)Pennsylvanian Epoch, Carboniferous Period

Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Infraphylum:	Agnatha
Superclass:	Cyclostomi
Class:	Petromyzontida
Order:	Petromyzontiformes
Genus:	†Pipiscius Bardack & Richardson, 1977
Species:	†P. zangerli
Binomial name
†Pipiscius zangerli Bardack & Richardson, 1977

Pipiscius is an extinct genus of lamprey that lived about 300 million years ago, during the MiddlePennsylvanian Epoch of theCarboniferous Period. The genus contains asingle species,P. zangerli, known from theMazon Creek fossil beds located in present-dayIllinois.^[1]

It has a distinctive crown-like mouth comprising a ring of radially arranged teeth.^[2] However, some specimens assigned to the coeval lampreyMayomyzon, also found in the Mazon Creek beds, also have similar mouthparts. SincePipiscius does not have many any other defining features, it has been suggested that the two genera aresynonymous, with the nameMayomyzon havingpriority.^[3]

Fossil collectors have nicknamedPipiscius the "Push me-Pull you" in reference to each end being very similar in shape.^[4]

References

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^Bardack, David.; Richardson, Eugene Stanley (1977)."New agnathous fishes from the Pennsylvanian of Illinois".Fieldiana.3 (26).Field Museum of Natural History:489–510.doi:10.5962/bhl.title.5167.
^Shu, D.; Conway Morris, S.; Zhang, X-L.; Chen, L.; Li, Y.; Han, J. (1999). "A pipiscid-like fossil from the Lower Cambrian of south China".Nature.400 (6746): 746.Bibcode:1999Natur.400..746S.doi:10.1038/23445.S2CID 204995356.
^Gabbott, Sarah E.; Sansom, Robert S.; Purnell, Mark A. (2021-08-24). Lomax, Barry (ed.). "Systematic analysis of exceptionally preserved fossils: correlated patterns of decay and preservation".Palaeontology.64 (6):789–803.doi:10.1111/pala.12571.ISSN 0031-0239.
^Wittry, Jack (2012).The Mazon creek fossil fauna. Downers Grove, Ill: Esconi.ISBN 978-0578111483.