Propeamussium manaricum (Smith, 1906)
SMITH, E. A. 1906. Natural history notes from H.M. Indian Marine Survey Steamer “Investigator”, series 3 (10). On Mollusca from the Bay of Bengal and the Arabian Sea. The Annals and Magazine of Natural History [7th serie], 18: 157-175, 245-264. [p. 256]
1906 Amussium [sic] manaricum E. A. Smith, 1906
«Testa fragilis, pellucido-albida, opaco-albo radiata, inicquivalvis, leviter obliqua, et paulum inaequilateralis, valva sinistra couvexiuscula, concentrice tenuiter lamellata, lirisque radiantibus tenuibus plus minus cancellata, valva dextra concentrice lamellata, versus marginem concava; umbones acuti, ad angulum circa 115° convergentes; lirae internae circiter 15, haud ad marginem continuae, illis in valva sinistra tenuioribus; auriculce inaequales, anticis paullum majoribus.
Longit. 24.5 mm., alt. 26, diam. 4.5. Hab. Station 333, Gulf of Manar, 401 fath.; Station 322, Andaman Islands, 378 fath.
The valves are fairly strong up to the ends of the radiating lirae, but beyond that point they become very fragile and easily break away. The concentric fine lamellae are very similar in both valves, but the left valve, which is gently convex from the umbo to the opposite margin, also exhibits fine radiating lirae. These, however, gradually disappear about the middle of the valve, so that only the upper half of the surface is cancellated. The auricles, of which the anterior are a trifle larger than the posterior, exhibit fine lines of growth and a few radiating threads also, excepting the hinder auricle of the right valve, which hardly shows any trace of this radiating sculpture. The front auricle of the same valve is bounded below by a narrow groove at the byssal sinus.» EDGAR ALBERT SMITH, 1906
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«Smith, 1906: 256
Type locality. “Investigator” stn 333, Gulf of Manar, 401 fathoms (733 m); stn 322, Andaman Islands, 378 fathoms (691 m).
Type material. Syntype ZMB 58.735 (“Amussium manaricum Smith/Gulf of Manar/401 fathoms”; pair of articulated valves; material obtained from Sowerby & Fulton).
Seven syntypes BMNH 1906.10.12.91–98 (pairs of articulated valves). Syntype NMW 1955.158.786 (a pair of matching valves). Syntype ZSI M 3748/1 (a pair of articulated valves). Cited measurements by Smith (1906: 256): “Longit. 24.5 mm., alt. 26, diam. [thickness] 4.5.” Remarks. The current taxonomic position of this species is Propeamussium manaricum (Smith, 1906), placed in the family Propeamussiidae. So far only
recorded from the type locality and lives bathyally on soft bottom assemblages.» DIJKSTRA, H. H. & F. KÖHLER. 2008. An annotated catalogue of Recent Pectinoidea (Mollusca, Pectinidae and Propeamussiidae) type material in the Museum of Natural History, Humboldt University, Berlin. Zoosystematics and Evolution, 84 (1): 31-44, figs. 1-4. [p. 38]
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Amussium
manaricum, syntype; H. H. Dijkstra & F. Köhler, 2008, An annotated catalogue of Recent Pectinoidea type material in the Museum of Natural History, Humboldt University, Berlin, figure 1d. |