Caulleriella nobska, Blake, 2021

Blake, James A., 2021, New species and records of Caulleriella (Annelida, Cirratulidae) from shelf and slope depths of the Western North Atlantic Ocean, Zootaxa 4990 (2), pp. 253-279: 259-261

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Caulleriella nobska

new species

Caulleriella nobska   new species

Figure 3 View FIGURE 3

Material examined. (71 specimens) Northeastern USA, off Nobska Point, Woods Hole, Massachusetts, coll. Oct 1975, N.J. Maciolek, 41°30.86ʹN, 70°39.36ʹW. ca. 5–10 m, holotype ( MCZ 161683 View Materials ), 70 paratypes ( MCZ 161684 View Materials ) GoogleMaps   .

Description. A moderately sized species, with long narrow body widest in middle segments; holotype complete, with 88 setigers, 21.5 mm long, 0.3 mm wide across anterior setigers, 0.44 mm wide across middle setigers, narrowing again in posterior setigers. Body rounded dorsally, flattened ventrally with shallow mid-ventral groove extending from peristomium to posterior segments ( Fig. 3A View FIGURE 3 ). Color in alcohol opaque white to light tan; most specimens with light brown cast in middle segments; some specimens with dark brown spots or short bands in variable patterns along body, but not consistent.

Pre-setiger region long, narrow, as long as first 3½ setigers ( Fig. 3A–B View FIGURE 3 ). Prostomium triangular in dorsal view, tapering to pointed tip ( Fig. 3B View FIGURE 3 ), relatively narrow in lateral ventral view ( Fig. 3A View FIGURE 3 ); nuchal organs semicircular grooves on lateral posterior margin; eyespots absent. Peristomium long, narrow, not divided but with well-developed broad dorsal crest ( Fig. 3A–B View FIGURE 3 ); dorsal tentacles arise from posterior margin ( Fig. 3A–B View FIGURE 3 ); first branchiae lateral to dorsal tentacles ( Fig. 3A–B View FIGURE 3 ); second pair of branchiae dorsal to notosetae on setiger 1 and in same location on subsequent setigers ( Fig. 3B View FIGURE 3 ).

Parapodia   reduced, with no distinct podia or postsetal lobes apparent; setae arising directly from body wall. Noto- and neuropodia not widely separated as in related species. Notosetae of first 10–12 setigers all capillaries; hooks first present from setigers 11–13 (13 in holotype). Neurosetae of first 9–10 setigers all capillaries; hooks first present from setigers 10–11 (11 in holotype). Capillaries of both noto- and neuropodia numbering about 8–10 in larger specimens, arranged in two rows with capillaries of first row shorter and thicker than capillaries of second row; notosetae longer than neurosetae ( Fig. 3D View FIGURE 3 ). Capillaries with broad blades and distinct fimbriated edge with individual fibrils often separated producing the appearance of a serrated edge ( Fig. 3E–H View FIGURE 3 ). Hooks accompanied by 1–2 capillaries for 1–3 segments, then capillaries entirely absent along body in both noto- and neuropodia ( Fig. 3I View FIGURE 3 ). Hooks numbering one per noto- or neuropodium through first third of body, then increasing to two and three hooks in middle and posterior setigers. Hooks in noto- and neuropodial fascicles directed toward one another, vis-à-vis ( Fig. 3I View FIGURE 3 ). Individual hooks with recurved shaft tapering to distinct bidentate apex; main fang directed at about 45° to shaft with short pointed apical tooth; hood and sheath absent. Hooks of neuropodia appearing slightly thicker and more sigmoidally curved ( Fig. 3L–M View FIGURE 3 ) than those of notopodia ( Fig. 3J–K View FIGURE 3 ).

Pygidium with two simple lobes; anal cirri absent ( Fig 3C View FIGURE 3 ).

Methyl Green staining. No pattern.

Remarks. Unlike most shallow-water species of Caulleriella   , C. nobska   n. sp. has a long narrow body lacking a distinct separation of the thorax and abdomen. The peristomium is unusually long and bears a prominent dorsal crest. In addition, the noto- and neuropodia are only moderately separated from one another. However, the nature of the recurved bidentate hooks is similar to other species where a hood or sheath is lacking.

Caulleriella nobska   n. sp. is most similar to C. venefica   , another species from the northeastern United States that is widespread on the continental shelf. Both species have a pointed prostomium, an elongate, smooth peristomium with a dorsal crest, and bidentate hooks lacking a crest or sheath. Caulleriella nobska   n. sp. differs from C. venefica   in having a shorter prostomium, up to three hooks in posterior neuropodia instead of two, and no anal cirri on the pygidium instead of two cirri. In addition, the bidentate hooks of C. venefica   as illustrated by Doner & Blake (2006) and as observed in this study, have the main fang at a more acute angle than the 45° angle observed in C. nobska   n. sp. and C. venefica   may have a single thin capillary seta accompanying the hooks in middle and posterior setigers instead of capillaries being entirely absent in posterior setigers of C. nobska   n. sp.

Etymology. The epithet is from the collecting locality off Nobska Point, a promontory in Woods Hole, Massachusetts and the location of a historic lighthouse.

Distribution. Massachusetts, shallow subtidal.