Phaneropora galatheae Zezina, 1981

Bitner, Maria Aleksandra & Logan, Alan, 2016, Recent Brachiopoda from the Mozambique-Madagascar area, western Indian Ocean, Zoosystema 38 (1), pp. 5-41 : 28

publication ID	https://doi.org/10.5252/z2016n1a1
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scientific name	Phaneropora galatheae Zezina, 1981
status

Treatment

Phaneropora galatheae Zezina, 1981 View in CoL

( Fig. 15 View FIG ; Table 13)

Phaneropora galatheae Zezina, 1981a: 18-19 View in CoL , pl. 4, figs 1-7; 1985: 205; 1987: 560. — Foster 1989: 298, fig. 14.29-14.30. — Laurin 1997: 449, 450, figs 36A-D, 37. — Bitner 2008: 444, fig. 15A- F.; 2009: 16, fig. 9A.

Leptothyrella cf. ignota View in CoL – Hiller 1986: 137, 138, fig. 19A-D.

MATERIAL EXAMINED. — Mozambique Channel. MAINBAZA, stn CC 3152, 29 bivalved specimens. — Stn CC 3153, 4 bivalved specimens. — Stn CC 3154, 5 bivalved specimens.

South Madagascar. ATIMO VATAE, stn DW 3515, 1 bivalved specimen. — Stn CP 3585, 10 bivalved specimens. — Stn CP 3592, 22 bivalved specimens, 1 ventral valve, 1 dorsal valve. — Stn CP 3615, 5 bivalved specimens.

DEPTH RANGE. — 184- 636 m.

MEASUREMENTS. — See Table 13.

REMARKS

The subfamily Phaneroporinae is represented by two genera, the monospecific genus Phaneropora Zezina, 1981 and Leptothyrella Muir-Wood, 1959 having three species, L. ignota , L. incerta , and L. fijiensis . Both genera are very similar exter- nally but clearly differ internally. In Phaneropora there is a gap between the crura and septal pillar ( Zezina 1981a, 1987; Bitner 2008) whereas Leptothyrella has continuous descending branches attached to the septum (Muir-Wood 1959; Logan 1983, 1998; Álvarez & Emig 2005; Bitner 2008). Thus, the presence or absence of descending branches constitute the main criterion for separating those genera ( MacKinnon & Lee 2006b; see also discussion in Bitner 2008: 444).

Phaneropora galatheae has already been reported from the Madagascar region ( Hiller 1986; Zezina 1987). It is a small species, weakly biconvex with a smooth surface. Its foramen is large, margined by two, narrow deltidial plates; beak ridges are distinctly tuberculate ( Fig. 15F, H View FIG ). The teeth are supported by short dental plates ( Fig. 15I View FIG ). The flattened area at the extremity of each crura is interpreted as the rudiment of a descending branch ( Fig. 15L, M View FIG ).

References

ALVAREZ F. & EMIG C. C. 2005. - Brachiopoda, in ALVAREZ F., EMIG C. C., ROLDAN C. & VIEITEZ J. M., Lophophorata, Phoronida, Brachiopoda. Fauna Iberica, vol. 27. Museo Nacional de Ciencias Naturales, Madrid: 57 - 177.

FOSTER M. W. 1989. - Brachiopods from the extreme South Pacific and adjacent waters. Journal of Paleontology 63: 268 - 301.

HILLER N. 1986. - The South African Museum's Meiring Naude cruises. Part 16. Brachiopoda from the 1975 - 1979 cruises. Annals of the South African Museum 97: 97 - 140.

LAURIN B. 1997. - Brachiopodes recoltes dans les eaux de la Nouvelle Caledonie et des iles Loyaute, Matthew et Chesterfield, in CROSNIER A. (ed.), Resultats des Campagnes MUSORSTOM, vol. 18. Memoires du Museum national d'Histoire naturelle 176: 411 - 471.

LOGAN A. 1983. - Brachiopoda collected by CANCAP I-III expeditions to the South-East North Atlantic. 1976 - 1978. Zoologische Mededelingen 57: 165 - 189.

LOGAN A. 1998. - Recent Brachiopoda from the oceanographic expedition SEAMOUNT 2 to the north-eastern Atlantic in 1993. Zoosystema 20 (4): 549 - 562.

MACKINNON D. I. & LEE D. E. 2006 b. - Platidioidea, in KAESLER R. L. (ed.), Treatise on invertebrate Paleontology. Part H. Brachiopoda Revised. Geological Society of America and University of Kansas. Boulder, Colorado and Lawrence, Kansas, vol. 5: 2225 - 2228.

ZEZINA O. N. 1981 a. - Recent deep-sea Brachiopoda from the Western Pacific. Galathea Report 15: 7 - 20.

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.

Figures

FIG. 15. — Phaneropora galatheae Zezina, 1981, South Madagascar, South-West Point Barrow, ATIMO VATAE, stn CP 3592, 450-455 m: A-C, dorsal view (A) of immature complete specimen (MNHN IB-2013-84), and enlargement of the umbonal part to show details of the beak (B) and the dorsal protegular node (C); D, dorsal view of complete specimen (MNHN IB-2013-85); E, F, dorsal view of complete specimen (E) and enlargement of the umbonal part (F) (MNHN IB- 2013-86); G-I, inner view of ventral valve (MNHN IB-2013-87), and enlargement of posterior part (H), and tilted view to show dental plates (I); J-M, dorsal valve (MNHN IB-2013-88), inner and oblique views, and enlargement (L, M) to show details of brachidium and cardinalia. All SEMs. Scale bars: A, F, H, I, L, 500 µm; B, M, 200 µm; C, 50 µm; D, E, G, J, K, 1 mm.