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The study on the structure of sporodermis and elements of ornamentation in megaspores of the genus Verrutriletes (Van der Hammen 1954) Potonié 1956 revealed that the verrucae are part of the perine sculpture.
A new ahermatypic scleractinian coral, Flabellum rariseptatum sp.n., belonging to the Flabellum thouarsii-group of species, has been described from Tertiary glacio-marine sequence of the Cape Melville Formation cropping out at the King George Island, South Shetland Islands, Antarctica.
Przedstawiono wyniki analizy Cladocera z osadów późnoczwartorzędowych, wykonane dla 5 profilów z 4 zbiorników słodkowodnych. Szczegółowa analiza jakościowa i ilościowa gatunków Cladocera pozwoliła na rekonstrukcję rozwoju kopalnych jezior z okolic Worytów (Pojezierze Mazurskie) i Niechorza (Pomorze Zachodnie). Na podstawie składu gatunkowego i ilości szczątków w osadach wydzielono fazy rozwoju Cladocera,...
The effects of the application of horizontal (population) as opposed to vertical (typologic) taxonomy on precision of ammonite chronozonation are discussed and an example of stratigraphic inference that can be derived from the population method is presented. An almost complete macroconch from Świętoszewo, Pomerania, is compared with a standard, biometrically studied series of samples from the Early...
Diffingiina subordo n., tentatively included in Stauriida Verrill, 1865, is characterized by the adaxial split of the inner end of at least one (the cardinal) septum; the development of the basal plate and the vertical position of the young corallite at the beginning of its growth; the absence of septal furrows; the shortening of the counter septum at least during some part of the neanic growth; the...
Knowledge on transport and regulation of free calcium in the living cell is used in support of the theory (Kaźmierczak et al. 1985) linking the onset of biocalcification at about the Precambrian/Cambrian boundary to a rise in Ca²⁺ concentrations in the shelf seas to levels toxic to biota. Following this event, fluctuating Ca²⁺ levels in the Phanerozoic seas are supposed to have challenged a variety...
Four specimens of Coeloterorhynchus schucherti (Stainbrook, 1945) from the Frasnian of southern Poland retain their color pattern of the shell preserved in form of several radial stripes.
Two lizards, Carolina intermedia gen. et sp. n. and Shinisauroides latipalatum gen. et sp. n. from the Late Cretaceous (? Middle Campanian) of the Gobi Desert are assigned to the new family Carolinidae. A hypothesis of a scincomorphan affiliation of this family is supported by two synapomorphies: the dentary overlap on the lateral surface of the coronoid, and the finger-like descensus parietalis,...
The ornithischian dinosaurs are analysed using the cladistic methodology. The preferred hypothesis (see fig. 1) is that: 1. Ornithischia are monophyletic, 2. Ankylosauria are sister group of all other ornithischians, 3. Pachycephalosauria + Ceratopsia are monophyletic unit sharing common characters not found in other ornithischians. Quadrupedality is considered as primitive ornithischian condition.
Elements of species of Drepanoistodus Lindström, Panderodus Ethington, and Protopanderodus Lindström systematically vary from symmetrical to pronouncedly asymmetrical (symmetry-transition series) within each species, and a group of elements with systematic increase in curvature of the cusp can be recognized for each element type; each such group is named a curvature-transition series. Panderodus and...
Two new aberrant sessile graptolites from glacial boulders are described. The Silurian form, Urbanekicrusta reversa gen. et sp.n., is interpreted as a crustoid (hormograptid?) graptolite, whereas the Ordovician (?), Maenniligraptus ursulae gen. et sp.n., represents presumably an unknown order of Graptolithina.
Bifissurinella cornifera sp.n. and Bifissurinella cf. triangularis Poignant et Ubaldo, 1973, are described from the Middle Miocene of the Central Paratethys. New morphological features are reported in the two species which may support the assignment of Bifissurinella to the Bryoza. The generic assignment of the described species is discussed.
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