Brachaniec, T., Lach, R., Salamon, M. A., and Brom, K. R., 2017: Echinoid Bite Traces on Late Cretaceous (Early Maastrichtian) Sea Lilies from Southern Poland. Paleontological Research, Vol.21 No.1, 1-6. doi:10.2517/2016PR015.
This study describes a new genus of melocrinitid crinoid from the Middle Devonian, Givetian Stage, of Iowa (subclass Camerata, family Melocrinitidae). The specimen described is assigned to Ronsocrinus gen. nov. within the family Melocrinitidae. Ronsocrinus rabia gen. et sp. nov. possesses a long heteromorphic column, small calyx plates with raised stellate patterns and a well-developed, long anal tube. Species within the family Melocrinitidae do not commonly possess a long anal tube or a spherical cup shape and the family diagnosis is expanded to include species with these characteristics.
Matsuoka, K., Yurimoto, T., Chong, V. C., and Man, A., 2017: Marine palynomorphs dominated by heterotrophic organism remains in the tropical coastal shallow water sediment; the case of Selangor coast and estuary of Manjung River in Malaysia. Paleontological Research, Vol.21 No.1, 14-26. doi:10.2517/2016PR006.
Ishida, Y., Fujita, T., Kiyomoto, M., Roper, M., Komatsu, T., Kato, K., Shigeta, Y., and Kumagae, T., 2017: How striations of ophiuroid and asteroid trace fossils were produced -Observations of tube-feet movement in living ophiuroids and asteroids. Paleontological Research, Vol.21 No.1, 27-36. doi:10.2517/2016PR003.
Shigeta, Y. and Nakajima, Y., 2017: Discovery of the early Spathian (late Olenekian, Early Triassic) ammonoid Tirolites in the Hiraiso Formation, South Kitakami Belt, Northeast Japan. Paleontological Research, Vol.21 No.1, 37-43. doi:10.2517/2016PR017.
Ali, M. S. M., 2017: First Record of a New Species of Amblypygus (Echinoidea) from the Middle Miocene of Mersa Matruh, Western Desert, Egypt. Paleontological Research, Vol.21 No.1, 44-53. 10.2517/2016PR016.
The echinoid genus Amblypygus Agassiz is reported for the first time from the middle Miocene and is represented by a new species, A. matruhensis sp. nov., from the area west of Mersa Matruh, Western Desert, Egypt. This extends the range of Amblypygus from the lower Eocene to the middle Miocene. A morphological comparison between the two genera Amblypygus and Echinoneus shows that they differ in that Amblypygus has a semi-ethmolytic apical disc and crenulate, perforate tubercles whereas Echinoneus has an ethmophract apical disc and non-crenulate, non-perforate tubercles. The paleoecology and the paleogeography of the genus Amblypygus are discussed.
Yamaguchi, T., Matsui, H. and Nishi, H., 2017: Taxonomy of Maastrichtian—Thanetian Deep-Sea Ostracodes from U1407, IODP Exp 342, Off Newfoundland, Northwestern Atlantic, Part 1: Families Cytherellidae, Bairdiidae, Pontocyprididae, Bythocytheridae, and Cytheruridae. Paleontological Research, Vol.21 No.1, 54-75. 10.2517/2016PR010.
In ocean drilling sites, the taxonomy of Paleocene ostracodes has been poorly investigated. We describe and illustrate 18 ostracode taxa from Cretaceous?Paleocene sediments at U1407 of Integrated Ocean Drilling Program Expedition 342 off Newfoundland, Northwestern Atlantic; these 18 taxa belong to the families Cytherellidae, Bairdiidae, Pontocyprididae, Bythocytheridae, and Cytheruridae, and include five new species: Bythoceratina subumbonata sp. nov., Bythoceratina wilsoni sp. nov., Cytheropteron newfoundlandense sp. nov., Cytheropteron americanum sp. nov., and Nemoceratina (Pariceratina) guerneti sp. nov. Our identification and description of the taxa enable us to assess paleobiodiversity and paleoenvironments on the seafloor in the North Atlantic.
All species of the genus Sinamia (Sinamiidae, Amiiformes) are reviewed on the basis of the examination of the holotypes, paratypes, other specimens, and original descriptions of each species. Diagnoses are provided for all species. Phylogenetic analysis supports the monophyly of the family Sinamiidae and demonstrates that the long dorsal fin base in Sinamia and Amia is a matter of convergence. It is considered that the species having a long dorsal fin base lived in still water with vegetation, like Amia calva, while the species having a short dorsal fin base probably lived in the open water.