Jolonica suffusa (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

Jolonica suffusa (Cooper, 1973)

( Fig. 13 B-E)

Compsoria suffusa Cooper, 1973a: 25 , pl. 7, figs 26-44, pl. 8, figs 1-10. — Zezina 1985: 170.

Jolonica suffusa – MacKinnon & Hiller 2010: 194, text-figs 1E-J, 2E, F, 4A-D, 5A-B, 6A-D, 7A-F. — Zezina 2010: 1190.

MATERIAL EXAMINED. — Mozambique Channel. MAINBAZA, stn CP 3130, 1 bivalved open specimen.

North-West Madagascar. MIRIKY, stn CP 3261, 1 ventral valve.

South Madagascar. ATIMO VATAE, stn CP 3587, 1 bivalved, slightly damaged specimen.

DEPTH RANGE. — 112- 217 m.

MEASUREMENTS. — Length 25.8 mm, width?20.5 mm, thickness 15.9 mm.

REMARKS

This species was originally described by Cooper (1973a) from off Mozambique as Compsoria suffusa . Re-study of the loop and cardinalia resulted in the placing of Compsoria in synonymy with Jolonica ( MacKinnon & Lee 2006a; MacKinnon & Hiller 2010). This laqueoid genus is represented in modern oceans by four species, of which three (including the type species) have been previously recorded from the Indian Ocean ( Logan 2007) . The collection from Madagascar contains only three specimens but they are well enough preserved to be able to identify them with the type species J. suffusa which was comprehensively described and illustrated by Cooper (1973a). While the early adult loop in Fig. 13F is slightly shorter in relative length than that shown in Cooper (1973a: pl. 7, fig. 35), the two forms are otherwise closely similar. Its shell is elongate oval, smooth, pale pink in colour. In the ventral valve the deltidial plates are conjunct ( Fig. 13C, D ). The teeth are supported by well-developed dental plates ( Fig. 13E ). The cardinal process is prominent. The loop is long with descending branches attached to the short median septum by connecting bands.

Figures

FIG. 13. — A, Frenulina sanguinolenta (Gmelin, 1791), dorsal view of complete specimen (MNHN IB-2013-77), South Madagascar, Bay of Galions, ATIMO VATAE, stn TA01, 7-14 m, SEM. B-E, Jolonica suffusa (Cooper,1973):B, C, interior views of dorsal and ventral valves, showing brachidium, of open specimen (MNHN IB- 2013-78), Mozambique Channel, Maputo transect,MAINBAZA,stn CP 3130, 112-127 m, D, E, inner view of ventral valve (MNHN IB-2013-79), and tilted view (H) to show dentral plates, North-West Madagascar, between Majumga and Cap Saint-André, MIRIKY, stn CP 3261, 197-217 m. Scale bars: A, 2 mm; B-E, 5 mm.