Page 313 - Introduction to Paleobiology and The Fossil Record

300 INTRODUCTION TO PALEOBIOLOGY AND THE FOSSIL RECORD

setae

shell
shell
lophophoral arm
mouth median muscle scar
gut posterior adductor scar
gonad
anterior adductor scar
anus
shell muscles nephridium pedicle oblique lateral scar
brachial
protractor
muscle scar
celomic cavity (c)
cuticle pedicle
muscle
(a) (b)
Dorsal valve
Ventral valve
Pedicle Lophophore
Pedicle foramen
Delthyrium
Umbo
Deltidial
plates
Rib
Growth lines
Dorsal valve
(d) Ventral valve (e)
mouth
Teeth
Cardinal process tips of brachia
Hinge axis trocholophe
Socket
Adjustor
muscle scar Adductor
muscle scars
Adductor
muscle scar zygolophe schizolophe early spirolophe
Brachidium
Diductor
muscle scar
f(i) Ventral valve f(ii) Dorsal valve
plectolophe ptycholophe spirolophe
(g)
Figure 12.1 Brachiopod morphologies: (a) internal features of a lingulate, (b) exterior of a burrowing
lingulate, (c) internal terminology of a craniform calciate, (d) internal features of a terebratulide,
(e) external terminology of a typical articulate, (f) internal terminology of both valves of a
terebratulide, and (g) main types of brachiopod lophophore.