Sao Barrande, 1846

Unger, Tanja, Hildenbrand, Anne, Stinnesbeck, Wolfgang & Austermann, Gregor, 2022, Biostratigraphy and taxonomy of polymerid trilobites of the Manuels River Formation (Drumian, middle Cambrian), Newfoundland, Canada, Geodiversitas 44 (33), pp. 1051-1087 : 1062

Genus Sao Barrande, 1846

Sao Barrande, 1846: 13 . —

Type species: Sao hirsuta Barrande, 1846 , by original designation.

Monadina – Barrande 1846: 19.

Monadella – Barrande 1847: 391.

Crithias – Hawle & Corda 1847: 17.

Tetracnemis – Hawle & Corda 1847: 17.

Goniacanthus – Hawle & Corda 1847: 18.

Enneacnemis – Hawle & Corda, 1847: 19.

Acanthocnemis – Hawle & Corda 1847: 20.

Acanthogramma – Hawle & Corda 1847: 20.

Endogramma – Hawle & Corda 1847: 21.

Micropyge – Hawle & Corda 1847: 21.

Selenosema – Hawle & Corda 1847: 23.

Staurogmus – Hawle & Corda 1847: 28.

DIAGNOSIS. —Wide cephalic border, strongly convex; glabella with three deep glabellar furrows and one longitudinal furrow; preglabellar field concave without ornamentation; cephalon with densely packed tubercles and small spines; thorax of 17 segments; pygidium short with one segment and one terminal piece (based on Harrington et al. 1959; Laibl et al. 2014, with modifications).

REMARKS

Barrande (1852b) was the first to describe the different growth stages of Sao . He revised different genera previously introduced by Barrande (1846) and Hawle & Corda (1847). Šnajdr (1958) further described the wide morphological range of ontogenetic stages, which is followed here. For further details see Šnajdr (1958).

Richter (1941) made a formal request to the International Commission on Zoological Nomenclature in favour of Sao Barrande, 1846 . He argued that the genus Sao Billberg, 1820 , was preoccupied by a Stomatopoda, but that the name was not used subsequently. While Monadina Barrande, 1846 was available, Sao was already a well-established name for the trilobite. Richter’s (1941) request was accepted and Sao Barrande, 1846 was given priority.