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Placentinechinus davolii Borghi & Garilli 2016

Diagnosis

provided by World Register of Marine Species
Small temnopleuroid echinoid with wheelshaped test, flattened above and below. Apical disc always much larger than the peristome and forming up to 82% of the test diameter in the largest (adult) specimens. The first 4-6 couples of pores adorally not well separated by a wall and confluent on the inner surface of the plates. Interambulacral plates wide and low adapically, becoming narrower and taller adorally, always with a single primary tubercle. Angular pits deep, with steep edges; they are lacking adapically. Small sutural pits occur at each triple junction, also in the ambulacra. Primary tubercles surrounded by a slightly depressed areole. Low horizontal ridges at the adapical edge of both ambulacral and interambulacral plates. All tubercles finely, but distinctly, crenulate. Auricles not joined above. Buccal notches almost absent. No morphological trace of dimorphism.

Reference

Borghi, E. & Garilli, V. (2016). A new subtropical-temperate brooding echinoid with no marsupium: the first Mediterranean and the last European Temnopleuridae from the Early Pleistocene of Italy. Journal of Systematic Palaeontology. 1-25.

license
cc-by-4.0
copyright
WoRMS Editorial Board
contributor
Andreas Kroh [email]

Stratigraphy

provided by World Register of Marine Species
Arda River section, sandy layer about 1 m below the base of the calcarenite bed and 40 m below the first occurrence of Arctica islandica.

Reference

Borghi, E. & Garilli, V. (2016). A new subtropical-temperate brooding echinoid with no marsupium: the first Mediterranean and the last European Temnopleuridae from the Early Pleistocene of Italy. Journal of Systematic Palaeontology. 1-25.

license
cc-by-4.0
copyright
WoRMS Editorial Board
contributor
Andreas Kroh [email]