Varese Echinoid (Jurassic of Italy)

Where: Varese, Italy (45.8° N, 8.8° E: paleocoordinates 33.4° N, 17.5° E)

• coordinate estimated from map

When: Late/Upper Pliensbachian (189.6 - 183.0 Ma)

Environment/lithology: offshore shelf; red lime mudstone and red marl

• A 20-m section of alternating micritic limestones and marls crops out here. Individual beds are between 0·1 and 0·2m thick, occasionally reaching 0·3 m, and they vary in colour from reddish pink to off-white. The echinoids come from marly layers in the lowest seven metres of section, and are most commonly encountered at the contact between marls and limestones.

Size class: macrofossils

Preservation: recrystallized

Collection methods: surface (in situ),

• Some 40 specimens, many of them virtually complete, were found by two amateur collectors, Mr Walter Paredi and Mr Piero Conca. These are now deposited in the Museo Civico di Storia Naturale di Milano (MSNM)

Primary reference: A. B. Smith and L. Anzalone. 2000. Loriolella, a key taxon for understanding the early evolution of irregular echinoids. Palaeontology 43(2):303-324 [W. Clyde/J. Finarelli/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 37504: authorized by Will Clyde, entered by John Finarelli on 15.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Belemnoidea -
Belemnitida indet. Zittel 1895 belemnite
originally entered as "Belemnita indet."
 Ammonitida - Hildoceratidae
Protogrammoceras meneghinii Bonarelli 1899 ammonite
Canavaria sp. Gemmellaro 1886 ammonite
 Ammonitida - Amaltheidae
Pleuroceras cf. spinatum Bruguière 1789 ammonite
Amaltheus margaritatus de Montford 1808 ammonite
 Phylloceratida - Phylloceratidae
Echinoidea
 Cidaroida - Cidaridae
Cidaridae indet. Gray 1825 pencil urchin
 Euechinoidea - Hemicidaridae
Hemicidaridae indet. Wright 1857 sea urchin
 Euechinoidea -
Crinoidea
 Millericrinida - Millericrinidae
Millericrinidae indet. Jaeckel 1918 Sea lily
Brachiopoda
  -
Brachiopoda indet. Cuvier 1805
unclassified
  -
Porifera indet. Grant 1836