Seven Cornulites species,including a new one—Cornulites leonei n.sp.,are described from the Upper Ordovician Portixeddu Formation(Katian,stage slices Ka2-3)of Sardinia and the Cavá(lower Katian,stage slice Ka2)a...Seven Cornulites species,including a new one—Cornulites leonei n.sp.,are described from the Upper Ordovician Portixeddu Formation(Katian,stage slices Ka2-3)of Sardinia and the Cavá(lower Katian,stage slice Ka2)and Estana(upper Katian,stage slices Ka3-4)formations of the Pyrenees.The Sardinian and Pyrenean cornulitids represent an adaptation to live in environments with high sedimentation rates and limited hard substrates availability.Their prominent annuli could have had a stabilizing function in the soft sediment that helped cornulitids to keep a favourable position in the sediment to enable suspension feeding.The known Late Ordovician cornulitid diversity in different Gondwana areas is low,usually ranging from one to three taxa,being higher(seven)in Sardinia.Like other benthic groups during the Late Ordovician,the cornulitid tubeworm faunas within the high-latitude peri-Gondwana Province indicate a certain endemism and share morphological and ecological affinities,such as a small body size and tubes with a strikingly small apical angle.Although essentially endemic,some links with cornulitids from the Late Ordovician of Scotland are revealed.展开更多
基金The financial supported was provided by a Sepkoski Grant from the Paleontological SocietyKing Saud University,Riyadh,Saudi Arabia,Researchers Supporting Project Number RSP 2024R140Project PDI2021-125585NB-100 of the Spanish Ministry for Science Innovation (MICINN)。
文摘Seven Cornulites species,including a new one—Cornulites leonei n.sp.,are described from the Upper Ordovician Portixeddu Formation(Katian,stage slices Ka2-3)of Sardinia and the Cavá(lower Katian,stage slice Ka2)and Estana(upper Katian,stage slices Ka3-4)formations of the Pyrenees.The Sardinian and Pyrenean cornulitids represent an adaptation to live in environments with high sedimentation rates and limited hard substrates availability.Their prominent annuli could have had a stabilizing function in the soft sediment that helped cornulitids to keep a favourable position in the sediment to enable suspension feeding.The known Late Ordovician cornulitid diversity in different Gondwana areas is low,usually ranging from one to three taxa,being higher(seven)in Sardinia.Like other benthic groups during the Late Ordovician,the cornulitid tubeworm faunas within the high-latitude peri-Gondwana Province indicate a certain endemism and share morphological and ecological affinities,such as a small body size and tubes with a strikingly small apical angle.Although essentially endemic,some links with cornulitids from the Late Ordovician of Scotland are revealed.
