[Type species= Gryphus africanus Cooper, 1973 (p. 8)]
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Small to medium, oval, ventribiconvex, smooth; anterior commissure rectimarginate; beak long, erect, labiate, foramen large, permesothyrid, symphytium visible; pedicle collar short, teeth large; cardinal process broad, semielliptical; hinge plates narrow, poorly defined; loop narrow, rounded, transverse band convex anteriorly.
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Diagnosis from volume 5 of the
Treatise on Invertebrate Paleontology (2006)
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Xenobrochus africanus (Cooper, 1973)
Type locality: “Anton Bruun Cruise 7, Station 358A, 366 m, 29°19'S, 32°00'E, Durban Bay, South Africa.”
Depth range: 70 - 850 m
Gryphus africanus Cooper 1973
Xenobrochus anomalus Cooper 1981
Diagnosis in preparation -
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Xenobrochus agulhasensis (Helmcke, 1939)
Type locality: station 106, Agulhas Bank, 35°26,8' S - 20°56,2'E - Deutsche Tiefsee-Expedition (1898)
Depth range: about 100 m
Terebratula vitrea var. minor Philippi : Davidson (1880)
Lioythyrina n. Blochmann, 1906
Lioythyrina agulhasensis Helmcke, 1939
Liothyrella agulhasensis Cooper, 1973
Diagnosis in preparation -
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Xenobrochus anomalus Cooper, 1981
Type locality: “MD.08: station 15, BB 88 - Latitude 46°57.7'S, longitude 37°59.9'E, southeast of Marion Island at 204 m.”
Depth range: 204 - 460 m
Diagnosis (Cooper, 1981)
Very small, elongate oval Xenobrochus with tubular pedicle collar and extended, erect, socket ridges.
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Xenobrochus australis Cooper, 1981
Type locality:
“MD.08: station 11, CP 7 - Latitude 53°20.3'S, longitude 72°29.2'E, west of Heard Island at 790 m.”
Depth range: 200 - 967 m
Diagnosis (Cooper, 1981)
Large Xenobrochus with width 60% of length.
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Xenobrochus rotundus Bitner, 2008
Type locality: Lau Ridge, Fiji Islands
Depth range: 255 - 550 m
Diagnosis (Bitner, 2008)
Xenobrochus rounded in outline with small foramen, prominent cardinal process, outer hinge plates rudimentary to absent, and transverse band anteriorly convex with a slight median fold.
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Xenobrochus norfolkensis Bitner, 2011
Type locality: Norfolk Ridge (seamount Eponge, SW Pacific)
Depth range: 200 - 927 m
Diagnosis (Bitner, 2011)
Small Xenobrochus with elongate oval outline, rectimarginate; beak erect, foramen medium, mesothyrid, symphytium visible; no cardinal process, outer hinge plates triangular, loop rounded with a wide, anteriorly convex transverse band.
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Xenobrochus islandicus Hansen, 2024
Type locality: The Danish "Ingolf" expedition 1896 : st. 84, 62°58'N, 25°24'W, off W Iceland; 1192 m depth.
Depth range: 260 - 1505 m
Liothyris arctica: Wesenberg-Lund (1941) [partim]
Waldheimiathyris cranium: Wesenberg-Lund (1941) [partim]
Liothyrella arctica: Zezina (1997) [partim]
Diagnosis (Hansen, 2024, p. 31, Fig. 17-18)
Xenobrochus species with elongate, pointy, eggshaped outline and evenly rounded to slightly flattened anterior margin; beak erect with visible symphytium; permesothyrid medium large foramen; transverse cardinal process; angular brachial loop reaching about 1/3 valve length, with broad transverse band with a weak median fold.
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Facsimile of the text-fig of Hansen (2024). |
