Publications by authors named "Matus Hyzny"

Based on the re-examination of the type and additional material of a fossorial shrimp Callianassa kerepesiensis Müller, 1976, from the middle Miocene (Badenian) of Hungary, the species is re-assigned to Calliax de Saint Laurent, 1973. Additionally, Callianassa reinhardpalorum sp. nov.

View Article and Find Full Text PDF

Today representatives of the giant cirolanid isopods of the genus Bathynomus inhabit tropical to warm-temperate waters of the West Atlantic and the Indo-West Pacific. In not so distant geological past, however, the genus was present also in the Mediterranean, as documented by numerous fossils from the Plio-Pleistocene of Italy. Herein, a somewhat older occurrence of the genus is reported, from the North-East Atlantic.

View Article and Find Full Text PDF

With approximately 1,500 extant species, freshwater crabs (Decapoda: Brachyura) are among the most diverse decapod crustaceans. Nevertheless, their fossil record is extremely limited: only Potamidae, Potamonautidae and Trichodactylidae are reported up to the Eocene of the Neotropics so far. This work documents unusually large decapod claws from the Upper Cretaceous (Campanian) continental deposits of Velaux and vicinity (southern France), in close association with large vertebrate remains.

View Article and Find Full Text PDF

Alpheid snapping shrimps (Decapoda: Caridea: Alpheidae) constitute one of the model groups for inferences aimed at understanding the evolution of complex structural, behavioural, and ecological traits among benthic marine invertebrates. Despite being a super-diverse taxon with a broad geographical distribution, the alpheid fossil record is still poorly known. However, data presented herein show that the strongly calcified fingertips of alpheid snapping claws are not uncommon in the fossil record and should be considered a novel type of mesofossil.

View Article and Find Full Text PDF

Background: Isopods (woodlice, slaters and their relatives) are common crustaceans and abundant in numerous habitats. They employ a variety of lifestyles including free-living scavengers and predators but also obligate parasites. This modern-day variability of lifestyles is not reflected in isopod fossils so far, mostly as the life habits of many fossil isopods are still unclear.

View Article and Find Full Text PDF
Article Synopsis
  • A new study identifies and describes two new species of ghost shrimps from the Paleocene and Eocene periods in Pakistan, showcasing unique morphological features similar to modern shrimp from the Indo-West Pacific.
  • These new species are part of a broader "group" of seven fossil species with similar cheliped structures, including finds from Hungary, Italy, Myanmar, Java, the Philippines, and Thailand.
  • The research highlights challenges in tracing the migration patterns of these shrimp, but suggests a notable similarity in ghost shrimp across both Eastern and Western Tethyan regions.
View Article and Find Full Text PDF

Cenozoic decapod crustaceans housed in the collections of the Universalmuseum Joanneum (Graz, Austria) are reviewed. Previous descriptions, geographic and stratigraphic provenance and collection history are discussed. Altogether 72 specimens are figured, including five holotypes.

View Article and Find Full Text PDF

Decapod associations have been significant components of marine habitats throughout the Cenozoic when the major diversification of the group occurred. In this respect, the circum-Mediterranean area is of particular interest due to its complex palaeogeographic history. During the Oligo-Miocene, it was divided in two major areas, Mediterranean and Paratethys.

View Article and Find Full Text PDF

Although decapod crustaceans of the Central Paratethys were diverse during the Badenian (Langhian-Early Serravallian), a dramatic drop in their diversity occurred at the boundary with the Sarmatian. A crab is one of the few decapods reported from the Lower Sarmatian ( Zone) of the Paratethys. Until now, this species has been known from only a handful of specimens from Austria, Croatia and Bulgaria (Central Paratethys), and its systematics and ecology remain poorly known.

View Article and Find Full Text PDF

A new fossil species of the iphiculid genus Iphiculus Adams & White, 1849, (Crustacea, Brachyura) is described on the basis of three specimens from the Middle Miocene Florian Beds of Styria, Austria. Iphiculus eliasi sp. nov.

View Article and Find Full Text PDF

Ghost shrimps of Callianassidae and Ctenochelidae are soft-bodied, usually heterochelous decapods representing major bioturbators of muddy and sandy (sub)marine substrates. Ghost shrimps have a robust fossil record spanning from the Early Cretaceous (~ 133 Ma) to the Holocene and their remains are present in most assemblages of Cenozoic decapod crustaceans. Their taxonomic interpretation is in flux, mainly because the generic assignment is hindered by their insufficient preservation and disagreement in the biological classification.

View Article and Find Full Text PDF
Sakai, 2011 (Decapoda: Axiidea: Callianassidae) in the fossil record: systematics and palaeobiogeography.

Ann Naturhist Mus Wien Ser A Mineral Petrogr Geol Palaontol Anthropol Prahist

January 2016

The fossil record of the ghost shrimp genus Sakai, 2011 (Crustacea: Decapoda: Callianassidae) is revised. Sakai, 2011 and Sakai, 2011 are considered subjective synonyms of . Based on the examination of extant species it is argued that the morphology of the major cheliped merus, in combination with other hard part morphology characters, is sufficient for assignment of the fossil material into the genus.

View Article and Find Full Text PDF

Since its description, Typilobus Stoliczka, 1871, has become something like a catch-all taxon to accommodate fossil leucosioid crabs with uncertain affinities. As many as 17 species have been assigned to Typilobus, recorded from the Eocene to Miocene strata of Europe, Africa, and Asia. The re-examination of the type species, Typilobus granulosus Stoliczka, 1871, from the Miocene of Pakistan, has shown inconsistency in its description and published figures leading to the need of a revision of all species assigned to Typilobus.

View Article and Find Full Text PDF

Studies in systematic palaeontology are greatly aided when numerous, well-preserved specimens are available so that quantitative methods can be used to substantiate qualitative observations. This is often not the case for fossil decapod crustaceans due to their relatively low preservation potential. Here, we examined primarily two large collections of the well-preserved ghost shrimp from the Holo-Pleistocene of Panama and the late Miocene of Florida.

View Article and Find Full Text PDF

The present catalogue lists and figures the type and figured material of fossil decapod crustaceans housed in the collections of the Geological Survey of Austria in Vienna. Specimens previously believed to be lost were relocated. Lectotypes and paralectotypes are chosen herein for 11 species.

View Article and Find Full Text PDF

A new decapod crustacean faunule is described from the early Miocene of the Slovenian part of the Styrian Basin. The Ivnik Beds exposed at the Činžat locality contain seven species: (Axiidea: Callianassidae), Lepidophthalmus paratethyensis sp. nov.

View Article and Find Full Text PDF

Decapod crustaceans from the Ottnangian (middle Burdigalian, Lower Miocene) of the Western and Central Paratethys remain poorly known. In this study, we review and re-describe mud shrimps (), ghost shrimps ( sp., ) and brachyuran crabs of the families Leucosiidae, Polybiidae and Portunidae.

View Article and Find Full Text PDF
Barremian decapod crustaceans from Serre de Bleyton (Drôme, SE France).

Ann Naturhist Mus Wien Ser A Mineral Petrogr Geol Palaontol Anthropol Prahist

February 2015

Based on mostly small-sized isolated cheliped fingers, a new decapod crustacean assemblage is described from the Barremian of Serre de Bleyton (Drôme, SE France). The assemblage is composed mostly of representatives of the crab family Dynomenidae. In addition, remains of astacidean lobsters, axiidean shrimps, paguroid hermit crabs and brachyurous crabs of the families Necrocarcinidae and ?Cenomanocarcinidae occur in low numbers.

View Article and Find Full Text PDF

Numerous trace fossils are described from the Late Miocene sediments of the Bzenec Formation exposed at the Gbely section (the Vienna Basin, Slovakia). During deposition of the sediments the area was part of the large, long-lived brackish to freshwater Lake Pannon. Most of the trace fossils are attributed herein to igen et ispec.

View Article and Find Full Text PDF

Decapod crustacean assemblages from the Middle Miocene (lower 'Badenian'=Langhian) volcanoclastic Plášťovce Beds (Sebechleby Formation) in the Slovakian part of the Novohrad-Nógrad Basin comprise five species in five families (Callianassidae, Laomediidae, Munididae, Cancridae and Retroplumidae) and are dominated by the cancrid crab (Bittner, 1884). sp. constitutes the first record of this genus from Slovakia and the second from the European Neogene.

View Article and Find Full Text PDF

Ghost shrimps of the family Callianassidae are very common in the fossil record, but mostly as isolated cheliped elements only. The assignment to biologically defined genera, diagnosed on the basis of soft part morphology, is thus rather difficult. In this respect, proxy characters present on chelipeds that are the most durable ghost shrimp remains are needed to ascribe fossil material to extant genera.

View Article and Find Full Text PDF

Because of close morphological affinities, fossil cheliped fragments of the ghost shrimp (Decapoda, Axiidea, Ctenochelidae) can be easily misidentified as remains of different decapod crustacean taxa. Re-examination of the Cretaceous decapods deposited in the National Museum in Prague revealed that all supposed specimens of the lobster genus found in the Middle Coniacian calcareous claystones of the Březno Formation, including one of the Fritsch's original specimens of , actually belong to . This material together with newly collected specimens from the same locality, allowed for erection of a new species, Its major chela possesses a serrated ischium and ovoid, unarmed merus; therefore, it is considered a close relative of the extant and .

View Article and Find Full Text PDF