Minnivola pyxidata (Born, 1778)
BORN, I. VON. 1778. Index Rerum Naturalium Musei Caesari Vindobiniensis. Pars I. Testacea. Vindobonae [Vienna], ex Officina Krausiana [p. 93]
1778 Ostrea pyxidata Born, 1778
1845 Pecten crebricostatus Philippi, 1845
1939 Minnivola isomeres Iredale, 1939
1845 Pecten crebricostatus Philippi, 1845
1939 Minnivola isomeres Iredale, 1939
Ostrea pyxidata; I. von Born, 1780, Testacea Musei Caesarei Vindobonensis, plate 6, figures 5, 6.
|
Mus. Caes. Vindobon
IGNAZ VON BORN, 1778
|
«Additional description. – Shell up to ca. 50 mm high, circular, inequivalve, equilateral, left valve flattened to slightly concave, right valve strongly convex, auricles left valve subequal, right valve unequal in size and shape, with delicate radial striae, left valve with 20-24 radial ribs, interstices broader than ribs, right valve with smooth plicae (20-24) and narrow interstices. Colour left valve brownish with pale spots, right valve pale brown or whitish.
Type locality. – Not indicated (Index, 1778). “Patria ignota” (Testacea, 1780). Type material. – There is an articulated syntype (H 37.1 mm, W 39.9 mm), NHMW 14110, figured in Testacea (1780: pl. 6 figs 5-6). A small rectangular label with the number “2685.” in Indian ink is glued on the inside of the right valve. This high number is an original number used in Born’s time. Also a small oval label with “O.I.7” in Indian ink is glued at this side. The mark on the label corresponds with the numbers in the catalogues of Megerle von Mühlfeld (1809-1818) and Bremser & Partsch (1827-1835). A large rectangular label with “Gen. 15 Sp. 7. Ostrea sulcata“ in Indian ink is a showcase label, used after Born’s time. On this label is also a ‘new’ catalogue number “1822” in red ink, which is additionally marked on the inside of both valves, and on two ‘newer’ labels, probable added when Bremser & Partsch worked on the collection. The handwritings in pencil on one of the labels and in the catalogue of Bremser & Partsch are clearly corresponding. Taxonomic position. – Ostrea pyxidata is currently placed in Minnivola Iredale, 1939. Distribution. – Minnivola pyxidata occurs in the tropical Indo-West Pacific from the South China Sea southwards to Queensland (Australia).» DIJKSTRA, H. H. 2009. Type specimens of Pectinidae (Bivalvia) described by Ignaz von Born (1778 -1780). Basteria, 73: 99-116. [p. 113]
|
Ostrea pyxidata Born, 1778, NHMW 14110 (syntype); H. H. Dijkstra, 2009, Type specimens of Pectinidae described by Ignaz von Born, figures 47-50.
|
«Type material: Holotype NHMW 1822.
Type locality: Unknown. Type locality will be designated in a forthcoming publication on type material described by Born.
Material examined: The type material. HANSA BAY, PAPUA NEW GUINEA: PNG 1980: 6l, SE Wanginem 2, dredged, 40 m, leg. J. Pierret, 23.x.1980, 1 valve, IG 26.253.
Distribution: Northern Indian Ocean, western and southwestern Pacific. Living amongst seaweed on muddy sand sediments at littoral to sublittoral depths. Judging from the absence of ctenolium in the mature stage, specimens are probably not byssally attached.
Remarks: The present specimen is similar to the type material. Minnivola isomeres Iredale, 1939 from Queensland (Australia) is probably only an ecomorphical form of M. pyxidata. It differs somewhat from the present species by a slightly more concave left valve, fewer radial riblets and a more uniform colour. Intermediate variations, however, are also observed (AMS, HO, MNHN, NNM, WAM, ZMA).»
DIJKSTRA, H. H. 1998. Pectinoidea (Mollusca: Bivalvia: Pectinidae: Propeamussiidae) from Hansa Bay, Papua New Guinea. Molluscan Research, 19 (1): 11-52, pls. 1-9. [p. 26]
|
B. K. Raines & G. T. Poppe, 2006, A Conchological Iconography, The Family Pectinidae, plate 120, figures 2, 3 (Minnivola isomeres Iredale, 1939); figures 1, 4-7 (Minnivola pyxidata Born, 1778).
|
«Remarks:— The type species of Minnivola (M. isomeres Iredale) has not previously been illustrated. Miss Joyce Allan has located the holotype in the Australian Museum, and has very kindly sent the photographs now reproduced (PI. 13, figs. 5a, b). We are convinced that Minnivola isomeres and another Recent species, Pecten crebricostatus Philippi (specimens of which, in the British Museum (Natural History), have been labelled as Minnivola by Dr F. K. North), are congeneric with the series of fossil species described below. The genus seems to have originated in the region of S.E. Persia and W. Pakistan in the M. Miocene, to have persisted there into the Pliocene, and thereafter to have migrated to the Australasian-Philippines region, where it is represented rarely in the Recent faunas.»
EAMES, F. E. & L. R. COX. 1956. Some Tertiary Pectinacea from East Africa, Persia, and the Mediterranean region. Proceedings of the Malacological Society of London, 32 (1): 1-68, pls. 1-20. [p. 28]
|
Minnivola isomeres Iredale; F. E. Eames & L. R. Cox, 1956, Some Tertiary Pectinacea from East Africa, Persia, and the Mediterranean region, plate 13, figures 5a, 5b.
|