Comprehensive Description
provided by Smithsonian Contributions to Zoology
Eunice crassitentaculata (Treadwell, 1922)
Leodice crassitentaculata Treadwell, 1922:146–148, figs. 30–33, pl. 4: figs. 1–5.
MATERIAL EXAMINED.—Holotype, AMNH 1526, Pago Pago, Samoa.
COMMENTS ON MATERIAL EXAMINED.—The holotype is an anterior fragment and a median fragment of 88 segments, which may have belonged to the same specimen. The anterior end is described in detail.
DESCRIPTION.—Anterior fragment with 158 setigers; 135 mm long; maximum width, near posterior end of fragment, 3.5 mm; length through setiger 10, 9.5 mm; width at setiger 10, 2 mm. Anterior part of body cylindrical, becoming dorsoventrally flattened and expanded from about setiger 20.
Prostomium (Figure 36a) distinctly shorter than peristomium, distinctly narrower than peristomium, less than as deep as peristomium. Prostomial lobes frontally rounded, dorsally inflated; median sulcus deep. Black eyes present between bases of A-I and A-II. Antennae in a horseshoe, evenly spaced, similar in thickness. Ceratophores long and cylindrical in all antennae, without articulations. Ceratostyles tapering, without articulations. A-I to middle of peristomium; A-II to setiger 4; A-III to setiger 7. Peristomium about twice as wide as prostomium, barrel-shaped. Separation between rings distinct dorsally and ventrally; anterior ring slightly more than of total peristomial length. Peristomial cirri short and tapering, without articulations.
Jaws not seen. Maxillary formula according to Treadwell (1922:147) 1+1, 4+5, 7+0, 5+8, and 1+1.
Branchiae (Figure 36b) present, palmate, distinctly longer than notopodial cirri. Branchiae from setiger 28 as single filaments. Maximally 2 filaments present. Branchiae present to end of body according to Treadwell, present on more than 65% of total number of setigers.
Neuropodial acicular lobes distally triangular or rounded with single prominent aciculae emerging at midline. All presetal lobes low folds. Anterior postsetal lobes project as free lobes; median and posterior postsetal lobes low, transverse folds. First 4 ventral cirri tapering or digitiform. Ventral cirri basally inflated from setiger 5; inflated bases ovate, distinct in all setigers present in fragment; narrow tips tapering. Notopodial cirri thick and basally inflated in anterior setigers, becoming medially inflated in branchial region. Notopodial cirri without articulations.
Limbate setae slender with very narrow limbation. Pectinate setae (Figure 36c) flat, flaring. Both marginal teeth longer than other teeth; about 15 teeth present. Shafts of compound falcigers (Figure 36e) distally inflated, smooth. Appendages large; heads distinct, bidentate. Both teeth of same size, directed laterally. Guards symmetrically rounded; mucros absent. Pseudocompound falcigers and compound spinigers absent. Aciculae and subacicular hooks with black cores and clear sheaths. Aciculae single, tapering to blunt tips; crosssection round. Subacicular hooks (Figure 36d) bidentate. Hooks first present from setiger 32, present in all setigers thereafter, always single (except for replacements). Hooks with both teeth well developed; proximal teeth directed laterally.
UNKNOWN MORPHOLOGICAL FEATURES.—Relationship between Mx III and left Mx IV; pygidium and anal cirri.
EXPECTED STATES OF UNKNOWN MORPHOLOGICAL FEATURES.—Mx III short, forming part of distal arc with left Mx IV.
CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 22, 60. Unknown Characters: 1,2,6,33,34,36,40,42,63.
ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—None.
- bibliographic citation
- Fauchald, Kristian. 1992. "A Review of the Genus Eunice (Polychaeta: Eunicidae) Based upon Type Material." Smithsonian Contributions to Zoology. 1-422. https://doi.org/10.5479/si.00810282.523