'Reticulosa' sp: A Reticulosan Sponge from the Early Ordovician of Salta Province, northwestern Argentina.
[sciencythoughts.blogspot.com]
Reticulosan Sponges are a group of hexactine (six-rayed spicule) bearing early Sponges, that are considered typical components of the Cambrian Evolutionary Fauna. They are abundant in Cambrian deposits, scarce in the Early Ordovician, and subsequently unknown. Isolated fragments and partial specimens of 'Reticulosans' are known from the Tremadocian (earliest Ordovician, 485.4 to 477.7 million years ago) but they are not confidently assigned to a suitable taxon. The only diverse assemblages to date are those from Little Métis, Quebec, which is of uncertain age within the late Cambrian–Early Ordovician interval, and the Tremadocian-Floian Fezouata Biota of Morocco. A new association was described more recently from the Early Ordovician of Wales.
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