Haumea juddi Dall, Bartsch & Rehder, 1938
DALL, W. H., P. BARTSCH & H. A. REHDER. 1938. A manual of the Recent and fossil marine pelecypod mollusks of the Hawaiian Islands. Bernice P. Bishop Museum Bulletin, 153: i-iv, 1-233, pls. 1-58. [p. 86, pl. 22, figs. 1-4]
«Haumea juddi, new species (pl. 22, figs. 1-4).
1935. Pecten loxoides Hertlein: Nautilus, vol. 49, p. 29. Not of Sowerby. Shell of medium size, equivalved, both valves moderately inflated. Wings well developed. The color in this species is rather striking. The right valve is white with a reddish spot at the umbo; the left valve is variously mottled and banded with reddish brown. The anterior wing of the right valve is slightly notched at the base for byssal purposes. It is marked by three rounded threads on the basal half. The posterior wing is even larger, but bears no radiating marks in the right valve. In the left valve the three radiating lines are less strongly developed than in the right in the anterior end and the posterior end shows inclications of several basal radiating threads on its basal portion. In addition to this, both wings are marked by very closely spaced, very slender concentric lamellae which in the anterior wing of the left valve form scales near the basal portion. The central portion is marked by 21 strong radiating folds which are acute in the middle portion, gradually becoming rounded on the two extremes. These ribs are about as wide as the spaces that separate them. On the early portion of the posterior prodissoconch stage, fine, equally spaced and equally strong, concentric threads are present, which give to this portion of the shell a somewhat fenestrated appearance, which is lost on the subsequent stages of the shell. On the rest of the shell slender, low, threadlike lamellae of very regular strength and spacing cross the depressed spaces and the ribs. These are about one third as wide as the spaces that separate them. The interior of the shell corresponds with the exterior in color scheme, excepting the red spot on the right valve, which here is absent. The hinge area in the right valve has a median, poorly developed fold which has a corresponding depression in the opposite valve. There is also in the right valve, an indication of a tooth on both sides of the rather broad triangular resilial pit with corresponding depressions in the opposite valve. The entire hinge area is transversely sinuously striated. The basal portion of the interior of the shell shows flutings corresponding to the ribs on the outside. The edge is scalloped, a little less so on the lateral margin than on the ventral. The type, U.S.N.M. Cat. No. 337538. was dredged by Thaanum (Coll. No. 2020d) off Kaanapali, Maui, in 4-8 fathoms. It measures: height, 2-1.6 mm.; length, 24.5 mn.; diameter, 8.8 mm. We lhave seen the following additional specimens: U.S.N.M. Cat. No. 484168 specimens from the same source. U.S.N.M. Cat. No. 337537, 3 valves collected by Thaanum (Coll. No. 2020c) off Launiupoko Camp, Maui, in 4-8 fathoms. U.S.N.M. Cat. No. 335564, 1 valve collected by the U. S. Bureau of Fisheries Steamer Albatross at Station 4074 off the northeast and north coast of Maui in 78-85 fathoms, on coarse sand and foraminifera bottom; bottom temperatrrre 70.8º F. U.S.N.M. Cat. No. 335565, 3 specimens collected by the Albatross at Station 3861 in Pailolo Channel in 30-52-0 fathorns on fine sand, small pebble and coral bottom; surface temperature 74º F. U.S.N.M. Cat. No. 335566, 1½ specimens dredged by the Albatross at Station 3863 in Pailolo Channel in 127-154 fathoms on fine broken coral, coarse gravel and rock bottom; bottom temperature 60º F. U.S.N.M. Cat. No. 335675, 1 valve also dredged by the Albatross at Station 3847 off the south coast of Molokai in 23-24 fathoms on sand and stone bottom; surface temperature 76º F. U.S.N.M. Cat. No. 337536, 8½ specimens collected by Thaanum (Coll. No. 2020b) off Waikiki, Oahu, in 33-50 fathoms. Bishop Museum No. 10, 2 specimens from Waimea, Oahu. U.S.N.M. Cat. No. 362273, 54½ specimens collected by Edward Tyson on Pupukea Beach, Oahu. U.S.N.M. Cat. No. 337535, 1½ specimens collected by Thaanum (Coll. No. 2020a) at Waimea, Kauai. U.S.N.M. Cat. No. 337534, 2 specimens collected by Thaanum (Coll. No. 2020) at the same locality. This species has at times been referred to as Pecten superbus Sowerby. Sowerby's species is much larger than the Hawaiian, attaining a height of two and a half inches. It also has smaller auricles than our species and appears less oblique than the present form. The striking color pattern of this species will easily distinguish it from all the other Hawaiian forms.» WILLIAM HEALEY DALL, PAUL BARTSCH & HARALD ALFRED REHDER, 1938
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W. H. Dall, P. Bartsch & H. A. Rehder, 1938, plate 22.
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