| Summary: | Leodamas cuneatus new species Figures 28–29 urn:lsid:zoobank.org:act: 5650CFB0-06EA-4527-B0A1-AC0C167C54C8 Leodamas sp. 1: Maciolek et al . 1987b: D-3. Material examined . Off New England, US North Atlantic ACSAR Program , coll. G.W. Hampson, Chief Scientist. Sta. 5: Cruise NA-2, Rep. 1, 20 Apr 1985, 40°05.07′N, 67°29.78′W, 2060 m, holotype (USNM 1622267). Sta. 11 : Cruise NA-1, 3 Dec 1984, Rep. 2, 40°01.29′N, 70°55.04′W, 255 m, 2 paratypes (USNM 1622268).— Off New Jersey and Delaware, U.S. Mid-Atlantic ACSAR Program , coll. R.M. Petrecca, Chief Scientist. Sta. 11: Cruise Mid-3, Rep. 2, 04 Dec 1984, 38°40.14′N, 72°56.31′W, 1520 m (1, USNM 1622269). Description. A moderately sized species, holotype nearly complete with 90 setigers, about 30 mm long and 1.4 mm across thorax; larger of two juvenile paratypes (USNM 1622268) complete with 39 setigers, 3.7 mm long, 0.43 mm wide across thorax. Thorax of holotype with 14 setigers and branchiae from setiger 5; larger paratype with eight thoracic setigers and branchiae from setiger 5. Thoracic segments slightly wider than abdominal segments. Thoracic segments flattened dorsally and ventrally; abdominal segments also flattened dorsally, but rounded ventrally, with parapodia shifted dorsally. Thoracic setigers short, about 5 times wider than long; individual thoracic segments separated dorsally by prominent intersegmental ridge (Fig. 28A), ridges less prominent ventrally; in abdominal segments intersegmental area expanding across segments and with parapodial ridge individual segments visibly biannulate. Color in alcohol opaque white. Pre-setiger region triangular, wedge-shaped, merged dorsally with setiger 1 (Fig. 28 A–B). Prostomium short, broadly triangular, narrowing to pointed tip (Fig. 28 A–B); nuchal organs not observed; eyespots absent. Peristomium smooth dorsally, not divided by annular rings; ventrally surrounding mouth and forming upper and lower lips (Fig. 28B); upper lip a smooth circular ring; ventral lip with about 10 short lobes; proboscis partially everted ...
|
|---|