Early Ordovician Orthide Brachiopods from Mount Arrowsmith, Northwestern New South Wales, Australia
Author
Paterson, John R.
Author
Brock, Glenn A.
text
Records of the Australian Museum
2003
2003-08-13
55
2
221
230
https://journals.australian.museum/paterson-and-brock-2003-rec-aust-mus-552-221230/
journal article
10.3853/j.0067-1975.55.2003.1384
2201-4349
4685529
Alocorthis
n.gen.
Type
species
.
Alocorthis psygmatelos
n.gen. and n.sp.
Etymology
. Greek, f.,
alokos
, meaning furrow; referring to the furrows extending along the dorsal surfaces of the brachiophores.
| museum no. |
valve |
Mw |
Ml |
Hti |
Mrc |
| AM F120719 |
dorsal |
holotype |
12 |
6 |
NA |
NA |
| AM F120720 |
dorsal |
paratype |
10 |
5 |
NA |
74 |
| AM F120721 |
dorsal |
paratype |
6 |
5.5 |
NA |
NA |
| AM F120722 |
ventral |
paratype |
7.5 |
5.5 |
NA |
NA |
| AM F120723 |
ventral |
paratype |
6.5 |
5.5 |
1.5 |
NA |
| AM F120724 |
ventral |
paratype |
5.5 |
6.5 |
2 |
NA |
Diagnosis
. Shell transverse, weakly ventribiconvex. Ventral muscle field subtriangular, raised above valve floor and restricted to delthyrial cavity, bounded by short receding dental plates. Notothyrial platform short and very wide, anteriorly elevated above valve floor, supported by broad median ridge. Cardinal process absent. Brachiophores short, widely divergent (100–110°), with furrows extending along dorsal surfaces and with fan-like terminations. Dental sockets simple, subcircular. Fulcral plates absent.