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Genus Amphithyris Thomson, 1918 |
[Type species= Amphithyris buckmani Thomson, 1918 (p. 20)] |
Small shell (up to 5mm), planoconvex to biconvex, punctate, round to oval; shell outline variable depending on substrate of attachment. Ventral valve convex; dorsal valve slightly convex to almost flat; short pedicle; beak apicate; foramen amphithyrid; schizolophous lophophore. Hinge line nearly straight; triangular delthyrium; dental plates absent. |
Present
Diagnosis from Nauendorf et al. (2014) |
Extant Species of Amphithyris |
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Diagnosis Diagnosis Diagnosis Diagnosis Diagnosis Diagnosis Diagnosis |
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Amphithyris buckmani Thomson, 1918 Type locality: Cook Strait, off Wellington, New Zealand. Diagnosis |
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Amphithyris seminula (Philippi, 1836) Type locality: Trapani, Sicily, Mediterranean Sea Terebratula seminulum Philippi, 1836 : p. 97 Diagnosis (Nauendorf et al., 2014) |
The occurrence of Amphithyris needs to be confirmed.
Amphithyris is a South Pacific genus which had never been recorded in the Mediterranean Sea (considered as type locality of A. seminula). That is really surprising because this sea is probably the best known in brachiopod distribution, at least the Western Mediterranean Basin. As the specimens represented by various authors appear to be Amphithyris, the question is where the seminula specimens have been really sampled - thus confirmation with samples of alive specimens is need in the Mediterranean Sea. |
Amphithyris hallettensis Foster, 1974 Type locality: “Deep Freeze III, USS Atka station 23, near Cape Hallet (72°05.8'S, 172°15.2'E), 392 m; January 8, 1958.” Diagnosis (Nauendorf et al., 2014) |
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Amphithyris richardsonae Campbell & Fleming, 1981 Type locality: upper end of the Narrows, Long Sound (Preservation Inlet, New Zealand) Diagnosis (Nauendorf et al., 2014) |
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Amphithyris parva MacKinnon, Hiller, Long & Marshall, 2008 Type locality: Cook Strait, near Wellington (New Zealand) - 220 m Diagnosis (Nauendorf et al., 2014) |
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Amphithyris comitodentis Nauendorf, Wörheide & Lüter, 2014 Type locality: Hikurangi Plateau : st. 105, Cruise SO168 Zealandia (R/V Sonne) - 44º36.21'S, 174°14.77'E, 719m to 44º36.32'S, 174º14.80'E, 597m - [from personal comm. of C. Lüter, sept. 2014] Diagnosis (Nauendorf et al., 2014) |
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Amphithyris cavernicola Nauendorf, Wörheide & Lüter, 2014 Type locality: Holmes Reefs, Queensland (Australia) - from cave ceiling, at -8m Diagnosis (Nauendorf et al., 2014) Dorsal septum absent. Ventral valve with low median septum and muscle impressions visible on each side, exterior surface with tubercles and capillae. |