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Fossils

Exceptional fossilization

Apart from the Eocene of Monte Bolca, the Sinemurian of Osteno is the only fossil deposit in Italy in which soft bodies are preserved. The Osteno site was discovered in 1964. It was recovered from a series of 6 metres (20 ft) package of fine laminated, gray, spongiolitic, micritic limestone.⁷ Coroniceras bisulcatum allowed to date the outcrop as the Bucklandi zone, lower Sinemurian.⁸ The outcrop is a good documentation of a particularly complete fauna and flora of the Lower Jurassic which is not exactly common in the Southern Alps.⁹ The Osteno outcrop, part of the formation, is worldwide known due to the exceptional preservation of mostly marine biota, including rare fossilized components, helping to understand the ecosystems of the local Sinemurian margin of the Monte Generoso Basin.¹⁰ The high local variety of fossils found is most likely due to unique conditions of preservation, where phosphatized soft tissues have not been observed in any fish or polychaetes, but they are common in crustaceans (33%) and also occur in a smaller percentage of teuthids (14%).¹¹ Soft part preservation through phosphatization in this deposit includes the muscles and branchia of Crustaceans, fish tissues, and the digestive tracts of coleoids, polychaetes, and nematodes. These fossils are interpreted as having been preserved in a stagnant, restricted basin with anoxic conditions likely within the sediment pore waters.¹²

Structural scheme illustrating the syn-rift setting of the western Lombardian Basin during late Triassic and early Jurassic (most of the early jurassic terms belong to the calcare di Moltrasio and secondarily to Calcare di Domaro and Rosso Ammonitico Lombardo). The approximated location in the context of Osteno lagerstätte is indicated. References in the image.Artistic reconstruction of a hypothetical scene related to the Osteno deposit (Sinemurian-Lower Jurassic). Thylacocephalan Ostenocaris cypriformis are hunting cephalopods (Ostenoteuthis) and other arthropods (Coleia, Phlyctisoma). Two feed on the carcass of a conspecific. The sediment, which is very rich in siliceous sponge spicules, indicates that these forms were common and formed true “grasslands” on the seabed. The shark-like Palaeospinax pinnai passes in the background.

Nematoida

Genus	Species	Material	Location	Notes	Images
Eophasma1314	E. jurasicum	Six specimens with soft parts	Osteno Outcrop	A nematode, type member of the family Eophasmidae inside Desmoscolecida.15 A rare find, since nematode fossils are absent in most Mesozoic marine rocks.16

Annelida

Genus	Species	Material	Location	Notes	Images
Melanoraphia171819	M. maculata	Eleven specimens, complete with soft parts	Osteno Outcrop	A polychaete, member of the group Phyllodocemorpha with incertae sedis assignation, suggested to be a member of Lumbrineridae.20

Crustacea

Genus	Species	Material	Location	Notes	Images
Aeger21222324	A. foesteri A. muensteri A. robustus A. rostrospinatus A. elongatus A. macropus	Multiple specimens fairly preserved	Osteno Outcrop	A decapod, type member of the family Aegeridae. This genus is the most abundant local crustacean, and was a shrimp-like creature that was probably necrophagous.25
Coleia262728293031	C. vialiii C. medilerranea C. cf. antiqua C. pinnnai	Multiple specimens fairly preserved	Osteno Outcrop	A decapod, type member of the family Coleiidae. Probably a bottom dweller predatory crustacean.32
Eryma3334	E. sinemuriana	41 specimens, fairly preserved	Osteno Outcrop	A decapod, type member of the family Erymidae. The species was originally identified as Pustulina sinemuriana.35
Glyphea36	G. tricarinata	137 complete and fragmentary specimens	Osteno Outcrop	A decapod, type member of the family Erymidae. The species was originally identified as Pustulina sinemuriana.37
Mecochirus38	M. germari	81 complete and fragmentary specimens,	Osteno Outcrop	A decapod, member of the family Mecochiridae. Rather rare compared to other local crustacean genera.
Ostenosculda39	O. teruzzii	Single Specimen fairly preserved	Osteno Outcrop	A mantis shrimp
Palaeastacus4041	P. meyeri	Multiple specimens fairly preserved	Osteno Outcrop	A decapod, member of the family Erymidae. The species was originally included in the genus Eryma as E. meyeri, although the specimens reveal morphological characters diagnostic of Palaeastacus.42
Phlyctisoma43	P. sinemuriana	10 specimens, in a fairly good state of preservation	Osteno Outcrop	A decapod, type member of the family Erymidae. The species was originally identified as Pustulina sinemuriana.44
Pseudoglyphea454647	P. ancylochelis	7 complete specimens, in a fairly good state	Osteno Outcrop	A decapod, member of the family Litogastroidae. Probably a bottom dweller predatory crustacean.48
Teruzzicheles49	T. popeyei	Various specimens fairly preserved	Osteno Outcrop	A decapod belonging to the family Polychelidae

Xiphosurida

Genus	Species	Material	Location	Notes	Images
Ostenolimulus50	O. latus	A nearly complete specimen	Osteno Outcrop	A horseshoe crab, member of the family Limulidae. This genus represents the oldest Jurassic limulid and only the second xiphosuran known from Italy.51 Also indicates that this family were a diverse and widespread clade during the Jurassic.52

Thylacocephala

Genus	Species	Material	Location	Notes	Images
Ostenocaris53545556	O. cypriformis	Multiple specimens, complete and incomplete	Osteno Outcrop	A thylacocephalan, type member of the family Ostenocarididae inside Conchyliocarida. It is the most common fossil of the formation, and the main identified thylacocephalan from the formation.57

Cephalopoda

Genus	Species	Material	Location	Notes	Images
Arietites5859	A. bucklandi	Shells	Osteno outcrop	An ammonitidan, type member of the family Arietitidae inside Psiloceratoidea. The main ammonite identified locally.
Angulaticeras606162	A. sp.	Shells	Osteno outcrop	An ammonitidan, member of the family Schlotheimiidae inside Psiloceratoidea. It was not the most abundant ammonite, but was rather common.
Coroniceras636465	C. bisulcatum	Shells	Osteno outcrop	An ammonitidan, member of the family Arietitidae inside Psiloceratoidea. It was less common than other ammonites, although index for some locations.
Ectocentrites666768	E. sp.	Shells	Osteno outcrop	An ammonitidan, member of the family Lytoceratidae inside Lytoceratina. It was not the most abundant ammonite, but was rather common.
Ostenoteuthis6970717273	O. siroi	Several specimens with decent preservation	Osteno outcrop	A coleoid, type member of the family Ostenoteuthidae. A unique group of coeloids, only found at this location. Coleoids with ten arms each bearing pairs of hooks, Ostenoteuthis measure between 18 and 30 cm length.74
Oxynoticeras7576	O. oxynotum	Shells	Osteno outcrop	An ammonitidan, type member of the family Oxynoticeratidae inside Ammonitida. It was not the most abundant ammonite, but was rather common.
Uncinoteuthis7778	U. cuvieri	An incomplete specimen consisting of the arm crown only	Osteno outcrop	A coleoid, member of the family Ostenoteuthidae. A unique group of coeloids, only found at this location.79

Echinoderms

Genus	Species	Material	Location	Notes	Images
Hispidocrinus80	H. scalaris	Multiple ossicles	Pradalunga	An Crinoidean, member of the family Isocrininae inside Isocrinida.
Isocrinus81	I. spp.	Multiple ossicles	Ubiale - Clanezzo	An Crinoidean, member of the family Isocrininae inside Isocrinida.
Millericrinus82	M. cf. adneticus	Multiple ossicles	M. di Grone	An Crinoidean, member of the family Millericrinidae inside Millericrinida.
Palaeocoma8384	P. milleri	Multiple specimens	Ubiale - Clanezzo	An ophiuridan, member of the family Ophiodermatidae inside Ophiodermatina. Extant tropical species like Ophioderma are benthic predators and scavengers that show the same short spines seen in Palaeocoma.85

Hemichordata

Genus	Species	Material	Location	Notes	Images
Megaderaion86	M. sinemuriense	A nearly complete specimen with soft tissue	Osteno Outcrop	An acorn worm, member of the family Harrimaniidae inside Enteropneusta. This genus was probably benthic, linked with burrowing systems.87

Chondrichthyes

Genus	Species	Material	Location	Notes	Images
Hybodontiformes88	Indeterminate	Teeth	Osteno Outcrop	A shark, member of the family Hybodontiformes.
Myriacanthidae89	Gen et sp. nov	Virtually complete skull with associated parts of the branchial skeleton	Osteno Outcrop	A chimaerid, member of the family Myriacanthidae inside Chimaeriformes.
Ostenoselache9091	O. stenosoma	One complete articulated specimen	Osteno Outcrop	An euselachiian, type member of the family Ostenoselachidae inside Elasmobranchii. A unique genus of shark, only found in the Osteno Formation. With an elongated eel-shaped morphology, the specimens found measure at least 240 mm in length, with a neurocranium with a long, complex rostrum.92 It has been suggested it was an animal able to produce electric shocks, probably to kill prey.93
Palaeospinax9495	P. pinnai	A single specimen in four contiguous pieces and including parts of the dentition and squamation	Osteno Outcrop	A shark, type member of the family Palaeospinacidae inside Synechodontiformes. Open water swimmer.
Squaloraja969798	S. sp.	One complete articulated specimen	Osteno Outcrop	A chimaerid, type member of the family Squalorajidae inside Squalorajoidei. This genus belongs to a lineage of ray-like chimaeras.

Actinopterygii

Genus	Species	Material	Location	Notes	Images
Cosmolepis?99100	C. ornatus?	MSNM V617, complete specimen	Osteno Outcrop	A primitive actinopterygiian, member of the order Palaeonisciformes. A late surviving representative of the family. The specimens may not represent members of the genus.101
Dapedium102	D. sp.	MSNM V630, caudal fin with associated scales	Osteno Outcrop	A primitive actinopterygiian, type member of the family Dapediidae inside Holostei. Probably a Coral Environment wanderer.
Furo103	F. ("Eugnathus") sp.	MSNM V659, skull & anterior truncal body	Osteno Outcrop	A primitive actinopterygiian, type member of the family Furidae inside Ionoscopiformes. An enlongated Gar-alike taxon.
Pholidophorus104	P. cf.bechei	MSNM V621, complete specimen MSNM V556, isolated complete skull Multiple referred specimens	Osteno Outcrop	A primitive actinopterygiian, type member of the family Pholidophoridae inside Teleostei. Open water swimmer, probably forming schools. It is the main fish recovered on the formation.
Pholidolepis105	P. sp.	MSNM V409, complete specimen MSNM V594, isolated complete skull Multiple referred specimens	Osteno Outcrop	A primitive actinopterygiian, member of the family Pholidophoridae inside Teleostei. Open water swimmer, probably forming schools.
Palaeonisciformes?106107	Indeterminate	MSNM V618-19, skull & toracic section specimen Other 3 Specimens	Osteno Outcrop	Primitive actinopterygiians, suggested to be members of the order Palaeonisciformes. The features inferred to refer this specimens aren't enough to confirm the family association.108
Peripeltopleurus?109110	P. sp.	MSNM V659, almost complete specimen lacking the tail	Osteno Outcrop	A primitive actinopterygiian, member of the family Peltopleuridae inside Neopterygii. Probably represents the only known Jurassic survivor of the order Peltopleuriformes

Sarcopterygii

Genus	Species	Material	Location	Notes	Images
Undina111112	U. (Holophagus) cf. gulo	MSNM V587, isolated scales	Osteno Outcrop	A Coelacanth, member of the family Latimeriidae inside Coelacanthiformes. Isolated 20 mm scales of coelacanths analogous to the genus Holophagus are quite frequent on the Osteno deposits, suggesting a taxon up to 75 cm long.

Plants

Genus	Species	Material	Location	Notes	Images
Brachyphyllum113114115	B. saportum B. spp.	Branched Shoots	Osteno Outcrop Dintorni di Moltrasio	A coniferophytan, member of the family Cheirolepidiaceae inside Pinopsida.
Clathropteris116	C. platyphylla	Fronds	Carate-Lario	A Fern, member of the family Dipteridaceae
Ctenopteris117	C. grandis	Fronds	Moltrasio	A Fern, member of the family Polypodiaceae
Equisitites118119	E. bunburyanus	Stems	Osteno Outcrop	A Horsetail, member of the family Equisetaceae inside Equisetales. A freshwater-related plant, that grew as fast as modern bamboo on tropical settings.
Lomatopteris120	L. jurensis	Fronds	Carate-Lario	A "Seed Fern", affinities with Cyclopteridaceae inside Pteridospermatophyta.
Otozamites121122123	O. bunburyanus O. bechei O. latior O. brevifolius O. pterophylloides O. sp.	Leaflets	Osteno Outcrop Moltrasio Carate-Lario	A spermatopsidan, member of the family Bennettitales inside Bennettitopsida. Cycad-like flora, common on dry settings.
Pachypteris124125	P. cf. rhomboidalis	Fronds	Osteno Outcrop	A "Seed Fern", member of the family Corystospermaceae inside Corystospermales.
Pagiophyllum126127128	P. peregrinum P. sp.	Branched Shoots	Osteno Outcrop Carate-Lario	A coniferophytan, member of the family Araucariaceae inside Pinopsida.
Thinnfeldia129	T. rhomboidalis T. obtusa	Fronds	Carate-Lario	A "Seed Fern", member of the family Corystospermaceae inside Corystospermales.
Williamsonia130131	W. sp.	Reproductive Organ	Osteno Outcrop	A spermatopsidan, member of the family Bennettitales inside Bennettitopsida. Cycad-like flora, common on dry settings.
Widdringtonites132	W. baehmanni	Branched Shoots	Mombello	A coniferophytan, member of the family Araucariaceae or Cupressaceae inside Pinopsida.
Zamites133134	Z. sp.	Leaflets	Osteno Outcrop	A spermatopsidan, member of the family Bennettitales inside Bennettitopsida. Cycad-like flora, common on dry settings.

See also

• List of fossiliferous stratigraphic units in Italy
• Calcare di Sogno, Toarcian fossiliferous formation of Lombardy
• Saltrio Formation, Sinemurian fossiliferous formation of Lombardy
• Rotzo Formation, Pliensbachian fossiliferous formation of Veneto
• Coimbra Formation, Sinemurian fossiliferous formation of Portugal
• Aganane Formation, Pliensbachian Formation of Morocco

References

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77. Pinna, G. (2000). "Die Fossillagerstätte im Sinemurium (Lias) von Osteno, Italien". Europäische Fossillagerstätten. Vol. 3. pp. 91–136. doi:10.1007/978-3-642-57198-5_13. ISBN 978-3-642-62975-4. Retrieved 2 May 2023. 978-3-642-62975-4 ↩

78. Garassino, A.; Donovan, D. T. (2000). "A new family of coleoids from the Lower Jurassic of Osteno, Northern Italy". Palaeontology. 43 (6): 1019–1038. Bibcode:2000Palgy..43.1019G. doi:10.1111/1475-4983.00160. S2CID 129455509. Retrieved 2 May 2023. https://www.researchgate.net/publication/229813495 ↩

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84. Duffin, C. J. (1998). "Ostenoselache stenosoma ngn sp., a new neoselachian shark from the Sinemurian (Early Jurassic) of Osteno (Lombardy, Italy)" (PDF). Società Italiana di Scienze Naturali. 9 (7): 1–27. Retrieved 2 May 2023. http://mmtk.ginras.ru/pdf/DUFFIN,%20C.J.%201998.pdf ↩

85. Pinna, G. (2000). "Die Fossillagerstätte im Sinemurium (Lias) von Osteno, Italien". Europäische Fossillagerstätten. Vol. 3. pp. 91–136. doi:10.1007/978-3-642-57198-5_13. ISBN 978-3-642-62975-4. Retrieved 2 May 2023. 978-3-642-62975-4 ↩

86. Arduini, P.; Pinna, G.; Teruzzi, G. (1981). "Megaderaion sinemuriense n. g. n. sp., a new fossil enteropneust of the Sinemurian of Osteno in Lombardy". Atti della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naturale in Milano. 122 (2): 104–108. Retrieved 2 May 2023. https://biostor.org/reference/267277 ↩

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88. Duffin, C. J. (1991). "A myriacanthid holocephalan (Chondrichthyes) from the Sinemurian (Lower Jurassic) of Osteno (Lombardy, Italy)". Atti della Società italiana di scienze naturali e del museo civico di storia naturale di Milano. 132 (23): 293–308. Retrieved 3 May 2023. https://biostor.org/reference/267139 ↩

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107. Franceschi, Fabio; Marrama, Giuseppe; Carnevale, Giorgio (2024). "The enigmatic "palaeoniscoid" fishes from the Lower Jurassic (Sinemurian) of the Southern Alps (Osteno, Como, Italy)" (PDF). Paleodays. XXIV (4): 62. https://www.paleoitalia.it/wp-content/uploads/2024/06/Paleodays-2024-Abstract-Book_DEF.pdf#page=33 ↩

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113. Pinna, G. (2000). "Die Fossillagerstätte im Sinemurium (Lias) von Osteno, Italien". Europäische Fossillagerstätten. Vol. 3. pp. 91–136. doi:10.1007/978-3-642-57198-5_13. ISBN 978-3-642-62975-4. Retrieved 2 May 2023. 978-3-642-62975-4 ↩

114. Bonci, M. C.; Vanucci, G. (1986). "I vegetali sinemuriani di Osteno (Lombardia)". Atti della Società italiana di scienze naturali e del museo civico di storia naturale di Milano. 127 (2): 107–127. ↩

115. Sordelli, F. (1896). "Flora liasica ed infraliasica" (PDF). Flora fossilis Insubrica. Studi sulla vegetazione di Lombardia durante i tempi geologici: 38–55. http://storage.lib.uchicago.edu/pres/2014/pres2014-0241.pdf ↩

116. Sordelli, F. (1896). "Flora liasica ed infraliasica" (PDF). Flora fossilis Insubrica. Studi sulla vegetazione di Lombardia durante i tempi geologici: 38–55. http://storage.lib.uchicago.edu/pres/2014/pres2014-0241.pdf ↩

117. Sordelli, F. (1896). "Flora liasica ed infraliasica" (PDF). Flora fossilis Insubrica. Studi sulla vegetazione di Lombardia durante i tempi geologici: 38–55. http://storage.lib.uchicago.edu/pres/2014/pres2014-0241.pdf ↩

118. Pinna, G. (2000). "Die Fossillagerstätte im Sinemurium (Lias) von Osteno, Italien". Europäische Fossillagerstätten. Vol. 3. pp. 91–136. doi:10.1007/978-3-642-57198-5_13. ISBN 978-3-642-62975-4. Retrieved 2 May 2023. 978-3-642-62975-4 ↩

119. Bonci, M. C.; Vanucci, G. (1986). "I vegetali sinemuriani di Osteno (Lombardia)". Atti della Società italiana di scienze naturali e del museo civico di storia naturale di Milano. 127 (2): 107–127. ↩

120. Sordelli, F. (1896). "Flora liasica ed infraliasica" (PDF). Flora fossilis Insubrica. Studi sulla vegetazione di Lombardia durante i tempi geologici: 38–55. http://storage.lib.uchicago.edu/pres/2014/pres2014-0241.pdf ↩

121. Pinna, G. (2000). "Die Fossillagerstätte im Sinemurium (Lias) von Osteno, Italien". Europäische Fossillagerstätten. Vol. 3. pp. 91–136. doi:10.1007/978-3-642-57198-5_13. ISBN 978-3-642-62975-4. Retrieved 2 May 2023. 978-3-642-62975-4 ↩

122. Bonci, M. C.; Vanucci, G. (1986). "I vegetali sinemuriani di Osteno (Lombardia)". Atti della Società italiana di scienze naturali e del museo civico di storia naturale di Milano. 127 (2): 107–127. ↩

123. Sordelli, F. (1896). "Flora liasica ed infraliasica" (PDF). Flora fossilis Insubrica. Studi sulla vegetazione di Lombardia durante i tempi geologici: 38–55. http://storage.lib.uchicago.edu/pres/2014/pres2014-0241.pdf ↩

124. Pinna, G. (2000). "Die Fossillagerstätte im Sinemurium (Lias) von Osteno, Italien". Europäische Fossillagerstätten. Vol. 3. pp. 91–136. doi:10.1007/978-3-642-57198-5_13. ISBN 978-3-642-62975-4. Retrieved 2 May 2023. 978-3-642-62975-4 ↩

125. Bonci, M. C.; Vanucci, G. (1986). "I vegetali sinemuriani di Osteno (Lombardia)". Atti della Società italiana di scienze naturali e del museo civico di storia naturale di Milano. 127 (2): 107–127. ↩

126. Pinna, G. (2000). "Die Fossillagerstätte im Sinemurium (Lias) von Osteno, Italien". Europäische Fossillagerstätten. Vol. 3. pp. 91–136. doi:10.1007/978-3-642-57198-5_13. ISBN 978-3-642-62975-4. Retrieved 2 May 2023. 978-3-642-62975-4 ↩

127. Bonci, M. C.; Vanucci, G. (1986). "I vegetali sinemuriani di Osteno (Lombardia)". Atti della Società italiana di scienze naturali e del museo civico di storia naturale di Milano. 127 (2): 107–127. ↩

128. Sordelli, F. (1896). "Flora liasica ed infraliasica" (PDF). Flora fossilis Insubrica. Studi sulla vegetazione di Lombardia durante i tempi geologici: 38–55. http://storage.lib.uchicago.edu/pres/2014/pres2014-0241.pdf ↩

129. Sordelli, F. (1896). "Flora liasica ed infraliasica" (PDF). Flora fossilis Insubrica. Studi sulla vegetazione di Lombardia durante i tempi geologici: 38–55. http://storage.lib.uchicago.edu/pres/2014/pres2014-0241.pdf ↩

130. Pinna, G. (2000). "Die Fossillagerstätte im Sinemurium (Lias) von Osteno, Italien". Europäische Fossillagerstätten. Vol. 3. pp. 91–136. doi:10.1007/978-3-642-57198-5_13. ISBN 978-3-642-62975-4. Retrieved 2 May 2023. 978-3-642-62975-4 ↩

131. Bonci, M. C.; Vanucci, G. (1986). "I vegetali sinemuriani di Osteno (Lombardia)". Atti della Società italiana di scienze naturali e del museo civico di storia naturale di Milano. 127 (2): 107–127. ↩

132. Sordelli, F. (1896). "Flora liasica ed infraliasica" (PDF). Flora fossilis Insubrica. Studi sulla vegetazione di Lombardia durante i tempi geologici: 38–55. http://storage.lib.uchicago.edu/pres/2014/pres2014-0241.pdf ↩

133. Pinna, G. (2000). "Die Fossillagerstätte im Sinemurium (Lias) von Osteno, Italien". Europäische Fossillagerstätten. Vol. 3. pp. 91–136. doi:10.1007/978-3-642-57198-5_13. ISBN 978-3-642-62975-4. Retrieved 2 May 2023. 978-3-642-62975-4 ↩

134. Bonci, M. C.; Vanucci, G. (1986). "I vegetali sinemuriani di Osteno (Lombardia)". Atti della Società italiana di scienze naturali e del museo civico di storia naturale di Milano. 127 (2): 107–127. ↩