| Summary: | Caulleriella cryptica new species Figures 1–2 urn:lsid:zoobank.org:act: D83CE795-FBD8-41D1-8242-8CA989E8A68A Chaetozone sp. B: Maciolek et al . 1987b: D-2 (in part). Material examined . ( 10 specimens ) Off New England, North Atlantic ACSAR program , coll. G. Hampson, Chief Scientist. Sta. 5 : Cruise NA-5, Rep. 3, 30 Apr 1986, 40°05.01′N, 67°29.90′W, 2085 m, holotype (USNM 1661368); Cruise NA-1, Rep. 2, 05 Nov 1984, 40°05.16′N, 67°30.01′W, 2070 m, 3 paratypes (USNM 1661369); Cruise NA-2, Rep. 2, 29 Apr 1985, 40°05.07′N, 67°29.78′W, 2065 m, 2 paratypes (USNM 1661370); Rep. 3, 29 Apr 1985, 40°05.07′N, 67°29.88′W, 2065 m, 1 paratype (USNM 1661371). Cruise NA-3, Rep. 2, 04 Jul 1985, 40°05.08′N, 67°29.85′W, 2060 m 3 paratypes USNM 1661372). Description . A small threadlike species, holotype (USNM 1661368) complete, with 70 setigers, 13.6 mm long, 0.4 mm across anterior and middle segments, only narrowing in far posterior setigers (Fig. 2A); paratype (USNM 1661370) with 75 setigers, 7.1 mm long, 0.26 mm wide. Body generally cylindrical in cross section throughout, with segments of anterior third short, ca. 1.5 to 2 times as wide as long; middle and posterior setigers rounded, moniliform (Fig. 2A, E–F), slightly wider than long. Dorsal and ventral grooves absent. Color in alcohol light tan. Pre-setiger region long, narrow, about as long as first five setigers (Figs. 1A, 2A–B, D); prostomium and peristomium merged with one another (Figs. 1A, 2D). Prostomium long, narrow, triangular, tapering to pointed tip (Figs. 1A, 2A–B, D); eyespots absent; nuchal organs narrow slits on posterior lateral margin, weakly pigmented. Peristomium smooth, merging seamlessly with setiger 1 (Fig. 1A); with partial division into two rings dorsally, not evident ventrally; dorsal tentacles arising from near anterior border of second ring, with first branchiae located lateral and posterior to tentacles (Fig. 1A); second pair of branchiae arising dorsal to notosetae on setiger 1; subsequent branchiae similarly located. Dorsal tentacles broken ...
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