Eunice kobiensis McIntosh 1885

Eunice kobiensis Mcintosh, 1885

Eunice kobiensis Mcintosh, 1885:278–280, figs. 37, 38, pl. 38: figs. 12, 13, pl. 20A: figs. 1, 3.—Fauchald, 1969: 4–6, fig. 2a-g.

MATERIAL EXAMINED.—Holotype, BM(NH) ZK. 1885.12.1.197, Dredged off Kobe, Japan, 8–50 fathoms. Challenger.

COMMENTS ON MATERIAL EXAMINED.—The specimen has been frontally dissected and the jaw apparatus removed; it is cut into two pieces. Two sets of maxillae are present in a small vial accompanying the specimen; the maxillary formula is the same for both sets, even if one set appears too large to fit the holotype.

DESCRIPTION.—Holotype incomplete, of unknown sex, with 131 setigers; length 55 mm; maximal width 3.5 mm; length through setiger 10, 6.5 mm.

Prostomium (Figure 61a) distinctly shorter and narrower than peristomium, less than as deep as peristomium. Prostomial lobes frontally rounded, dorsally slightly flattened; median sulcus deep. Antennae in shallow horseshoe, evenly spaced, similar in thickness. Ceratophores ring-shaped in all antennae, without articulations. Ceratostyles slender, tapering, with up to 5 long, cylindrical articulations. A-I to posterior peristomial ring; A-II to setiger 3; A-III to setiger 8. Peristomium cylindrical. Separation between rings distinct on all sides; anterior ring ˜ of total peristomial length. Peristomial cirri to middle of anterior peristomial ring, slender, with 4 articulations.

Maxillary formula 1+1, 7+8, 7+0, 10+12, and 1+1. Mx III nearly as long as left Mx II; located behind Max II.

Branchiae (Figure 61e) present, pectinate, distinctly longer than notopodial cirri, not reduced in mid-body region, erect. Branchiae from setiger 3 to setiger 41. Branchiae terminating well before posterior end, present on less than 55% of total number of setigers. Three first and last 2 pairs single filaments, all others pectinate with up to 8 filaments. Stems slender, tapering, about as long as notopodial cirri. Filaments slender, about as long as notopodial cirri.

Pre- and postbranchial neuropodial acicular lobes (Figure 61b, f) distally rounded; acicular lobes in branchial region distally bluntly conical; aciculae emerging at midline. Pre- and postsetal lobes low, transverse folds. Pre- and postbranchial ventral cirri thick, tapering. Ventral cirri basally inflated from about setiger 4. Inflated bases ovate; tips thick and tapering. Anterior notopodial cirri long, medially inflated, becoming increasingly slender and tapering in branchial and postbranchial setigers. Prebranchial and branchial notopodial cirri with up to 3 long, cylindrical articulations; postbranchial notopodial cirri without articulations.

Limbate setae slender. Pectinate setae (Figure 61d) narrow, tapering, flat. One marginal tooth distinctly longer than other teeth, with ~10 teeth. Shafts of compound falcigers (Figure 61c, g) gently inflated, marginally finely dentate at least in some hooks. Appendages narrow, tapering, bidentate. Proximal teeth smaller than distal teeth, triangular, directed laterally or slightly distally. Distal teeth gently curved, blunt or pointed. Guards asymmetrically pointed; mucros absent. Pseudocompound falcigers and compound spinigers absent. Aciculae (Figure 61i) paired, yellow, pointed, straight or gently curved; cross-sections round. Separation between core and sheath indistinct in both aciculae and subacicular hooks. Subacicular hooks (Figure 61h) yellow, bidentate. Hooks first present from setiger 30, present in all setigers thereafter, always single (except for replacements). Hooks tapering; head distinct. Proximal and distal teeth similar in size. Proximal teeth triangular, directed laterally. Distal teeth curved, distinctly narrower than proximal teeth.

UNKNOWN MORPHOLOGICAL FEATURES.—Features associated with far posterior parapodia; pygidium and anal cirri.

EXPECTED STATES OF SELECTED UNKNOWN FEATURES.—None.

CHARACTERS USED IN PREPARATION OF KEY NOT SCORED.—Inappropriate Characters: 56, 58, 59. Unknown Characters: 1,2, 4, 6, 13, 14, 42,47, 50, 63.

ASSUMED STATES FOR PURPOSE OF PREPARING KEY.—None.

Eunice kobiensis McIntosh, 1885

Eunice kobiensis McIntosh, 1885, pp. 278–280, pl. 38: figs. 12–13, pl. 20A: figs. 1–3.—Izuka, 1912, pp. 117–118, pl. 13: figs. 11–12.—Berkeley and Berkeley, 1948, p. 90, fig. 135. [Not E. kobiensis Åkesson, 1967.]

[?]Eunice gracilis Moore, 1903, pp. 440–441, pl. 25: figs. 46–48.

Eunice longicirrata.—Imajima and Hartman, 1964, p. 256 [not E. longicirrata Webster].

MATERIAL.—Holotype (BMNH 1885:12:1:197) off Kobe, Japan, Challenger.

DESCRIPTION.—The holotype is an incomplete specimen with 131 setigers; it is 55 mm long and 3.5 mm wide with setae. It is brown and lacks color pattern.

The prostomium (Figure 2f) is twice as wide as long; the palpi are visible from the dorsal side and the anterior incision reaches the base of the median occipital tentacle. All occipital tentacles are slender; the outer lateral ones reach the first setiger; each has four articulations. The inner lateral tentacles reach the fourth or the fifth setiger; each has five articulations. The median tentacle reaches the tenth or eleventh setiger and has seven articulations. All articles are cylindrical. A pair of eyes is present posterior to the bases of the outer lateral occipital tentacles.

The cylindrical first peristomial segment is twice as long as the first setiger; the second peristomial segment is slightly shorter than the first setiger; the slender peristomial cirri are smooth and barely reach the anterior edge of the first peristomial segment.

Prebranchial parapodia (Figure 2b) have short and truncate presetal and postsetal lobes; the setal lobes are truncate with a short dorsal extension covering the dorsalmost aciculum. The slender dorsal cirri are nearly as long as half the width of the body; each has one basal articulation. The large ventral cirri are digitate. Parapodia in the branchial region (Figure 2g) have rounded parapodial lobes; all lobes are of the same length and there is no prolongation of the setal lobes associated with the acicula. The dorsal cirri are shorter and slenderer than in the prebranchial segments; each retains one basal articulation. The ventral cirri have slight basal swellings, but retain the large digitate tip. Parapodia in the postbranchial region (Figure 2a) have short, truncate parapodial lobes; the long dorsal cirri are smooth; the ventral cirri are digitate and somewhat slenderer than in the prebranchial region; the basal swellings are absent.

Branchiae (Figure 2g) are present on setigers 3–41; the three first and the last two pairs are single filaments; all others are pectinate. The maximal number of branchial filaments is eight, but most branchiae have only six or seven. The branchial stem is short and thick; the branchiae are not held erect over the dorsum; the branchial filaments are long.

Setae are broken off in most setigers; anterior setigers have simple limbate setae and composite hooks. The composite hooks (Figure 2c) have very short appendages; each has a thick, curved distal tooth and a small, conical proximal tooth. The short hoods are blunt; the proximal part of the hoods and the upper ends of the shafts are serrated. Pectinate setae (Figure 2e) are present in median and posterior setigers; each is distally straight with one slender whiplike prolongation and eleven to twelve teeth. Subacicular hooks (Figure 2d) are present from setiger 30 to the end of the fragment; one or two hooks are present in a parapodium. Each hook has a large proximal tooth and a small distal tooth; the hoods are short and blunt.

The pharyngeal apparatus has been dissected out and was found free in the tube with the specimen; it resembles the figure in McIntosh (1885, fig. 37) closely and it is assumed to be from the type-specimen. Maxilla I is falcate; maxilla II has seven teeth left and eight right; left maxilla III has seven teeth; the combined right maxillae III + IV have twelve teeth; left maxilla IV has ten teeth; both maxillae V and the mandibles are missing, but are assumed to have been present.