Argyrotheca jacksoni Cooper, 1973

Bitner, Maria Aleksandra & Logan, Alan, 2016, Recent Brachiopoda from the Mozambique-Madagascar area, western Indian Ocean, Zoosystema 38 (1), pp. 5-41 : 24-26

publication ID	https://doi.org/10.5252/z2016n1a1
publication LSID	urn:lsid:zoobank.org:pub:96BFE594-1B39-4541-9441-181617BD4CF9
DOI	https://doi.org/10.5281/zenodo.10526719
persistent identifier	https://treatment.plazi.org/id/AC16FF1A-7E56-FF80-ABCA-FA062DCD23CA
treatment provided by	Felipe (2021-03-03 16:45:34, last updated 2024-01-18 08:23:04)
scientific name	Argyrotheca jacksoni Cooper, 1973
status

Treatment

Argyrotheca jacksoni Cooper, 1973 View in CoL

( Fig. 14K, L View FIG )

Argyrotheca jacksoni Cooper, 1973a: 17 View in CoL , pl. 3, figs 9-13. — Bitner et al. 2008: 282-284, fig. 3A-K. — Logan et al. 2008: 303. fig. 3G-O. — Zezina 2010: 1191. — Logan & Bitner 2013: 169-171, fig. 6A-M.

Argyrotheca australis View in CoL – Zezina 1987: 558.

Argyrotheca View in CoL sp. — Hiller 1994: 784, fig. 12.8-12.9.

MATERIAL EXAMINED. — South Madagascar. ATIMO VATAE, stn CP 3615, 1 bivalved specimen, 1 ventral valve.

DEPTH RANGE. — 284- 286 m.

MEASUREMENTS. — Length 1.6 mm, width 1.9 mm, thickness 1.0 mm; length 1.8 mm, width 2.4 mm.

REMARKS

This species is characterized by its thin shell, small size (length of ventral valve rarely exceeding 2 mm) and numerous, shallowly rounded ribs. The investigated specimens are consistent with specimens of this species recorded by Cooper (1973a), Logan et al. (2008) and Logan & Bitner (2013) from the Red Sea. The specimens of A. jacksoni described from the Persian Gulf ( Bitner et al. 2008) differ slightly from those studied here and in the Red Sea in having more marked ribs. In outline and ornamentation the specimens from Madagascar are similar to A. cuneata (Risso, 1826) from the Mediterranean Sea, but lack the pink-red wash between the costae which is characteristic of that species.

The studied specimens differ strongly from another Argyrotheca species described from this region, A. angulata Zezina, 1987 , in outline and ornamentation. A. angulata is very transversely elongate (see below) and its shell is nearly smooth, having only four fine radial lines ( Zezina 1987).

References

BITNER M. A., LOGAN A. & GISCHLER E. 2008. - Recent brachiopods from the Persian Gulf and their biogeographical significance. Scientia Marina 72: 279 - 285.

COOPER G. A. 1973 a. - New Brachiopoda from the Indian Ocean. Smithsonian Contributions to Paleobiology 16: 1 - 45.

GMELIN J. F. 1791. - Systema Naturae. 13 ed., Beer, Lipsiae: 3021 - 4120.

HILLER N. 1994. - The environment, biogeography, and origin of the southern African Recent brachiopod fauna. Journal of Paleontology 68: 776 - 786.

LOGAN A., TOMASOVYCH A., ZUSCHIN M. & GRILL B. 2008 - Recent brachiopods from the Red Sea and Gulf of Aden. Fossils and Strata 54: 299 - 309.

LOGAN A. & BITNER M. A. 2013. - New records of Recent Brachiopoda from the Red Sea with a description of a new species. Zootaxa 3746: 161 - 174.

ZEZINA O. N. 1987. - Brachiopods collected by BENTHEDI- Cruise in the Mozambique Channel. Bulletin du Museum national d'Histoire naturelle, 4 serie, section A, 9: 551 - 563.

ZEZINA O. N. 2010. - Check-list of Holocene brachiopods annotated with geographical ranges of species. Paleontological Journal 44: 1176 - 1199.

Figures

FIG. 14. — A-J, Argyrotheca cf. angulata Zezina, 1987, North-West Madagascar, West of Cap d’Ambre, MIRIKY, stn DW 3199, 527-652 m: A-E, complete specimen (MNHN IB-2013-80), dorsal view (A); B-E, inner,oblique, tilted anterior views of dorsal valve, and enlargement (E) of septum and lateral outgrowths; F, inner view of ventral valve; G-J, complete specimen (MNHN IB-2013-81), dorsal view (G) and enlargement of umbonal part to show details of the beak; I, J, inner view of dorsal valve and enlargement (J) of tilted anterior view to show the prong; K, L, Argyrotheca jacksoni Cooper, 1973, South Madagascar, South Cap Sainte Marie, ATIMO VATAE, stn CP 3615, 284-286 m: K, inner of view of ventral valve (MNHN IB-2013-82); L, dorsal view of complete specimen (MNHN IB-2013-83). All SEMs. Scale bars: A-C, F-I, 1 mm; D, K, L, 500 µm; E, J, 200 µm.