Glossary of Morphological and Anatomical Terms
tabella - See adminicula.
taxolophous lophophore - Rudimentary lophophore with tentacles not completely encircling mouth.
teeth ridges - Linear elevations bounding delthyrium laterally, representing growth track of hinge teeth and commonly forming low elevations on internal surface of cardinal area in absence of dental plates.Fig.351_1b,Fig.351_2c.
telae - Pair of pointed terminations of beak ridges projecting into and beyond pedicle opening, formed by apical migration of pedicle.
terebrataliiform - Long reflected loop typical ofTerebratalia and related genera, with lateral connecting bands extending between descending lamellae and median septum.
terebratelliform - Long reflected terebratellide loop with lateral connecting bands uniting descending lamellae to median septum morphologically similar to terebrataliiform loop but deriving from dissimilar loop ontogeny.
terebratulid - Strongly curved posterior margin much less than maximum width of shell.
terebratulid stage - See sulciplicate.
terebratuliform - Short, typically U-or W-shaped loop found in most terebratuloids.
terebratuliniform - Short (deltiform) loop in which crural processes are fused medially to complete ringlike structure.
tertiary layer - Continuous layer of prismatic shell secreted by outer epithelium within margin of secondary layer and in internal succession to that layer.Fig.254,Fig.255.
tichorhinum - Small, suboval chamber, with or without median partition formed by medially directedstruts arising from dental plates converging onto median septum in spiriferide ventral valve; possibly accommodated base of adductor muscles.Fig.354.
tongue - See linguiform extension.
torynidium - See camarophorium.
trabecular - Long reflected loop typical of adult state of several remotely related long looped stocks (e.g., Terebratalia, Calloria), with lateral connecting bands extending between descending lamellae and median septum.
track - See muscle track.
trail - Subparallel extensions normally of both valves anterior to corpus and commonly resulting in a geniculate shell profile.Fig.287_6.
transmedian muscles - Pair of muscles in some lingulides anterior to umbonal muscle one muscle originating on left side of ventral valve rising dorsally to be inserted on right side of dorsal valve second muscle originating on right side of ventral valve and inserted on left side of dorsal.Fig.346_2,Fig.377.
transmuscle septa - Assemblage of narrow elevations comprising one median and two pairs of diverging laterals associated with strophomenoid dorsal adductor field.
transverse plate - See echmidium.
trocholophe - Lophophore disposed as ring surrounding mouth, bearing either single row of unpaired (or more rarely double row of paired) tentacles.Fig.112,Fig.113,Fig.114.
trocholophus - See trocholophe.
tropoconate - Brachia coiled parallel with plane of symmetry.
truncate - Ventral umbo of articulated brachiopods with beak abraded due to pedicle movement and foramen in transapical position (submesothyrid, mesothyrid permesothyrid and epithyrid).
