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Polychaeta source details
Thompson, Ida. (1979). Errant polychaetes (Annelida) from the Pennsylvanian Essex fauna of northern Illinois. Palaeontographica Abteilung A Palaeozoologie-Stratigraphie. 163(Lfg. 4-6): 169-199, 7 plates.
51915
Thompson, Ida
1979
Errant polychaetes (Annelida) from the Pennsylvanian Essex fauna of northern Illinois
Palaeontographica Abteilung A Palaeozoologie-Stratigraphie
163(Lfg. 4-6): 169-199, 7 plates
Publication
World Polychaeta Database (WPolyDb)
The Essex Fauna is the marine phase of the Maxon Creek beds; soft-bodied animals, including the polychaetes, are preserved as whole-body fossils in siderite concretions within the Francis Creek Shale. Descriptions of the polychaetes include details of the jaws, setae, prostomia, cuticles, and cirri. Nine of the species are placed in the order Phyllodocida, extant families Aphroditidae, Hesionidae, Phyllodocidae, Nephtyidae, and Glyceridae, and the new family Fossundecimidae. One species is placed in the order Amphinomida, extant family Amphinomidae. The Essex polychaetes comprise the earliest (and only Paleozoic) record for all the families. For the families Hesionidae, Nephtyidae, and Fossundecimidae this is the only fossil record.
As a group, the polychaetes were large, active, predaceous, and epifaunal. This contrasts with Recent polychaete faunas on soft bottoms, where the dominant polychaete type is a sedentary deposit feeder. Possible reasons for this difference are discussed, none proving entirely satisfactory.
America, North
Paleontology, Fossils, Paleobiology
Astreptoscolex Thompson, 1979 † (original description)
Astreptoscolex anasillosus Thompson, 1979 † (original description) Didontogaster Thompson, 1979 † (original description) Didontogaster cordylina Thompson, 1979 † (original description) Dryptoscolex Thompson, 1979 † (original description) Dryptoscolex matthiesae Thompson, 1979 † (original description) Fastuoscolex Thompson, 1979 † (original description) Fastuoscolex gemmatus Thompson, 1979 † (original description) Fossundecima Thompson, 1979 † (original description) Fossundecima konecniorum Thompson, 1979 † (original description) Hystriciola Thompson, 1979 † (original description) Hystriciola delicatula Thompson, 1979 † (original description) Levisettius Thompson, 1979 † (original description) Levisettius campylonectus Thompson, 1979 † (original description) Pieckonia Thompson, 1979 † (original description) Pieckonia helenae Thompson, 1979 † (original description) Raphidiophorus Thompson, 1979 † accepted as Rhaphidiophorus Thompson, 1979 † (basis of record) Rhaphidiophorus Thompson, 1979 † (original description) Rhaphidiophorus hystrix Thompson, 1979 † (original description) Rutellifrons Thompson, 1979 † (original description) Rutellifrons wolfforum Thompson, 1979 † (original description) Etymology From Greek Rhaphid = needle, phorus = bearer [details] Spelling Spelling error in heading for intended Rhaphidiophorus. Thompson uses the intended Rhaphidiophorus five times in ... [details] Spelling The article has a lapsus in the genus name heading spelling, presenting it as "Raphidiophorus". This has apparently ... [details] |