Haumea Dall, Bartsch & Rehder, 1938

Dijkstra, Henk H. & Beu, Alan G., 2018, Living Scallops of Australia and Adjacent Waters (Mollusca: Bivalvia: Pectinoidea: Propeamussiidae, Cyclochlamydidae and Pectinidae), Records of the Australian Museum (Rec. Aust. Mus.) 70 (2), pp. 113-330 : 303

Haumea Dall, Bartsch & Rehder, 1938

Haumea Dall et al., 1938: 86 . Type species (by original designation): Haumea juddi Dall et al., 1938 (= Pecten loxoides G. B. Sowerby II, 1882 ); Recent, Hawaiian Islands .

Diagnosis. Small Aequipectinini of circular to prosocline shape, both valves convex, right valve the more convex in most specimens; macrosculpture of narrow, evenly spaced radial plicae and delicate, closely spaced, commarginal lamellae throughout ontogeny of most specimens; auricles relatively narrow; internal rib carinae present; hinge teeth broad and prominent, anterior resilial tooth prominent, posterior weak; byssal notch deep, ctenolium well-developed.

Distribution.?Pliocene, Kenya (Cox, 1930); Pleistocene– Recent. Indo-West Pacific, living in the littoral to sublittoral zones.

Discussion. Hertlein (1969: N357) treated Haumea as a junior synonym of Argopecten Monterosato, 1889 , a subgenus of Chlamys , as did Vaught (1989: 118), placed in the suprageneric Chlamys group by Hertlein, and in the subfamily Chlamydinae (i.e., Pedinae ) by Vaught.

Haumea is considered here to be an extant Indo-Pacifc genus, differing morphologically from the extant eastern Pacific and western Atlantic genus Argopecten in its smaller size, its more strongly prosocline shape (more elongate to circular in Argopecten ), its smaller auricles, its more closely spaced interstitial commarginal lamellae, its very weak or lacking interstitial radial microsculpture (more prominent between the commarginal lamellae in Argopecten ), its more prominent internal rib carinae, and its weaker dorsal teeth (very prominent in Argopecten ). These characters indicate that Haumea is related to Aequipecten , Argopecten , and Cryptopecten , which are also all included in Aequipectinini (see Waller, 1991, 1993).