|
|
SEMELIDAE |
|
|
Click on an image to enlarge
|
Theora
lata
(Hinds, 1843) Description:
Shell translucent. Shape elongate-ovate, posterior and
anterior ends rounded, posterior much narrower. Umbo in front of
midline. Exterior polished, with weak irregular commarginal
growth ridges. Interior smooth, muscle scars and pallial line
usually not visible; pallial sinus extends past midline. Hinge
with small cardinal teeth, 1 in left valve and 2 in right; lateral teeth
long in both valves. Ligament in 2 parts; dorsal part
exterior, ventral part on prominent spoon-shaped projection. Shell
colour translucent white. Size:
Up to 18 mm in length. Distribution:
In Australia, known from the eastern half of Australia, from near
Darwin, NT, to Tas. Also recorded from Japan, Thailand, Malaysia and
Java, Indonesia. Habitat:
In NSW, known from bays and estuaries in mud, subtidally. In
Japan, in mud, down to 90 m depth (Okutani, 2000). Comparison:
This species differs from T. lubrica by not having the
ridge internally, by being more tapered at the posterior end and more
inflated. Synonymy:
Neaera fragilis A. Adams, 1856
and Theora nitida Gould, 1861. Fig.
1:
Port Hacking, NSW (C.378034) Interior eroded. |
|
