Treadwell described two new species from the Philippine Islands among genera of the Polynoidae, types in USNM. Their secretion may aid in the separation of the compact spindle into the spinning fibers. TUBES.—The tubes of the Acoetidae are unique among the Polychaeta for their general construction and the absence of any membranous lining.
The gastropods were found on the surface of the worms and may have had a cleaning function.
Prostomium oval or bilobed, with 2 pairs of sessile eyes or eyes lacking; lateral antennae anterior, not hidden by ocular peduncles or ommatophores [Figures
FIGURE 4 – Euarctu tubifex, holotype of Eupanthalis perlae from the Pacific Ocean (UZMC): A, dorsal view of the anterior end; B, right elytragerous parapodium from segment 2, anterior view, acicula dotted, neurosetae largely broken; C, right cirrigerous parapodium from segment 3, posterior view; T>-F, upper (point broken), middle and lower neurosetae of the same; G, right elytragerous parapodium from segment 4, anterior view, acicula dotted; Notopodia from segment 9 broad, rounded, flattened, on the anterodorsal half of larger neuropodia, with revolving glands (Figure 16A,F). Parapodia from segment 9 with notopodia large, round, flattened, on the anterodorsal half of neuropodium, with revolving glands, sometimes with some short capillary notosetae (usually hidden by notopodium); neuropodium large, with slightly bilobed conical anterior lobe and truncated postsetal lobe, with anteroventral bract enclosing the lower group of neurosetae and anterodorsal bract enclosing the upper group of neurosetae (Figure 17HJ).
Notopodium from segment 9 broad, rounded, flattened, on anterodorsal half of larger neuropodium, with notoaciculum and internal spinous glands, without notosetae; upper group of neurosetae of 2 types: (a) longer, spinous, aristate and (b) shorter, more slender, bipinnate;.
Punta Colorado, 3–5 m, shell and grass bottom, Tomas Barrera Expedition, 10 May 1914, Henderson and Bartsch, collectors, paratype with tube (USNM 16707). NOTES.— When this original manuscript was submitted to the Smithsonian Institution, I studied, figured, and described the above specimens as a new species of Eupolyodontes. The description and figures are deficient in many respects, but I have no doubt that the specimens I have examined should be referred to the new species of Ibarzibal.
Prostomium bilobed, with large ommatophores occupying the lateral parts of the prostomium, darkly pigmented with crescent-shaped transparent anterior part; central part of prostomium with a pair of large prostomial gills, attached to basal two-thirds, with free terminal portion; lateral antennae with short ceratophores attached to the anterior part of the prostomium, medial to ommatophores, with short styles; tentacular segment fused with prostomium, medial dorsal part forming elevated papillary nuchal lobe with rudimentary median occipital antenna with rounded ceratophore and minute style; papillary tentaculophores laterally and ventrally to large ommatophores, each with a single aciculum, a small needle lobe and a pair of dorsal and ventral tentacular cirri, with styles longer than the lateral antennae; paired short palps medially tentaculophores extending slightly.
Notopodia of segment 9 large, truncate, flattened, on the anterodorsal half of a large neuropodia, with internal spinnerets and a gap on the lower side for the formation of spinnerets; neuropodia with truncate or slightly bilobed presetal lobes and truncate postsetal lobes, with anterodorsal bract below notopodium and anteroventral bract crescentic (Fig. 241). TUBES.—The tube of the Bahamas specimen is grayish white, thick, and felt-walled. Second segment with first pair of large elytrophores and ventral buccal cirri longer than subsequent ventral cirri.
PIPES.—The two specimens described by Malaquin and Dehorne (1907) were found in pipes 1 meter and 750 mm. Prostomium broad, slightly bilobed, with weak middorsal depression, without cephalic branchiae; large ommatophores occupying lateral sides of prostomium, projecting forward to form transparent lenses; pair of small, oval, lateral antennae on the front of the prostomium medial to the ommatophores;. FKHJRB 2».—Eupolyodontes thomassini, holotype (MNHNP): A, dorsal view of anterior end; B, ventral view of anterior end; C, internal view of the distal end of the pharynx, cut ventrally; D, right 1st elytron from segment 2;.
Second segment with first pair of large elytrophores and ventral buccal cirrus similar to tentacular cirrus, larger than. Elytra oval to round, delicate, first pair large, covering dorsum, 2nd pair smaller, 3rd pair larger, followed by elytra leaving middle of back uncovered; elytra from segment S with shallow lateral pocket (Fig. 30C-G). The prostomium is bicuspid, with a narrow longitudinal depression and a pair of cylindrical prostomial branches joined medially at the basal part; a pair of large ommatophores occupying the lateral part of the prostomium, darkly pigmented, projecting anteriorly, forming transparent lenses; pair of short, conical lateral antennae with short ceratophores on anterior part of prostomium, medial to omatophores; tentacular segment fused to prostomium with winged papillate nuchal lobe with attached small, conical, median occipital antenna; tentaculophores.
Second segment with first pair of large elytrophores and ventral buccal cirri longer than subsequent ventral cirri, similar to but shorter than tentacular cirri; notopodium small, club-shaped, acicular lobe dorsal to larger rounded neuropodium, with 5-7 firm, smooth, acicular neurosetae (lower 2 with frayed ends) and numerous lower neurosetae, curved, lanceolate, with large spiny rows basally and short, close together spiny rows with fine points distally (Figure 30A3J-K). ETYMOLOGY. The species is named after the late Olga Hartman, in recognition of her many contributions to the Polychaeta.
Izuka based his fairly complete description and good figures on 4 large specimens, incomplete posteriorly, from Sagama Bay, Japan, in 70-183 m; largest 120+ segments, 525+ mm long, 44 mm wide with setae; the smallest 73+ segments, 170+ mm long, 24 mm wide, with pharynx fully extended. Prostomium and tentacular segment fused, with large ommatophores occupying lateral sides of prostomium, paired lateral antennae (= paired tentacula) on front of prostomium medial to ommatophores; small median occipital antennae (= median tentacula) on posterior part of prostomium (elevated nuchal lobe not clearly shown); tips of dorsal and ventral tentacular cirri (= tentacula) anterior and lateral to ommatophores; paired ventral palps (= . subtentacula) extending beyond ommatophores and transversely banded; no visible prostomial branchiae (Izuka, 1904, pi. DIAGNOSIS.-Prostomium oval, two-winged, with pair of large colorless ommatophores on anterior margin, not bounded by narrow neck, with 3 antennae: median antenna with ceratophore attached near middle of prostomium; lateral antennae inserted ventrally on ommatophores, with tips visible dorsally;.
First or tentacular segment visible dorsally; tentaculophores lateral to the prostomium, directed anteriorly, each with 1 or 2 acicula, 0 pairs of capillary setae and a pair of tentacular cirri. Second or buccal segment with first pair of elytra and long ventral buccal cirri; biramous parapodia with bundle of notosetae; neurosetae slender, spiny, lanceolate. Notopodium from segment 9 broad, rounded, flattened, on the anterodorsal half of the greater neuropodium, with notoaciculum and internal revolving glands, without notosetae; neuropodium with a lower group of numerous neurosetae in the lower anteroventral bract, curved, spiny, lanceolate; middle row of firm, acicular neurosetae with tips of spinous process, aristate; upper group of neurosetae, originating from low anterodorsal bract hidden by notopodium, of 2 types: (a) longer, with tufted tips and (b) shorter, bipinnate (hidden by notopodium).
Ommatophores globose, anterior about equal in width to posterior part of prostomium [Figures 35A, 39A] 2 Ommatophores not as wide as posterior part of prostomium [Figures 32A, 37A, 41A, 42A] 3 2. Ceratophore of median antenna; tentaculophores with row of papillae on inner side; tips of lateral antennae over passing ommatophores with only a short distance [Figure 35A] P.fauveli, new species Ceratophores of median antenna and tentaculophores without papillae; tips of lateral antennae surpassing ommatophores by distance equal to length of prostomium [Figure 39A] P. Ommatophores globose, with short "neck"; tips of lateral antennae extending only slightly beyond ommatophores [ Figure 37A ].
TYPE MATERIAL.-Holotype of Panthalis oerstedi, now in three pieces, with pharynx elongated (jaws excised and present in vial), with 84 segments, 98 mm long, 15 mm wide with setae. The description was based on an anterior fragment of a mature female of 25 segments, 16 mm long, 2 mm wide, including setae.
G4UJUHP-R = 0.1 mm.)
Tentacular segment dorsally distinct; tentaculophores lateral to prostomium, each with or without few setae and pair of dorsal and ventral tentacular cirri, basally inflated, longer and thicker than. Second segment with first pair of elytrophores, long ventral buccal cirri similar to tentacular cirri, and biramous parapodia;. Third segment with dorsal cirri with short cirrophores and styles extending beyond tips of neurosetae, basally inflated, longer than ventral cirri; notopodium conical with few notosetae; upper and lower neurosetae similar, long, lanceolate, arachnoid, slightly curved; middle neurosetae stout, acicular, aristate (Figure 41F-H).
Parapodia of segment 8 with dorsal and ventral cirri nearly equal in length, extending to tip of parapodium; notopodium conical, without notosetae; neurose-tae corresponding to those on preceding neuropodia. Third segment with dorsal cirri with short cirrophores and subulate styles, inflated basally, about the same length as ventral cirri, both extending to tips of neurosetae; notopodium small, rounded, with few notosetae; upper and lower neurosetae similar, long, lanceolate, spinous, with capillary tips; median neurosetae stout, acicular, with tips obtuse, hairy, aristate (Figure 42K–N). Parapodia of segment 8 with short dorsal and ventral cirri, without notosetae; neurosetae similar to those of more anterior parapodia (Figure 43A–D).
Dorsal cirrus with short cirrophores and short tips on nontrager segments; ventral cirrus short, subulate. Distal margin of large muscular pharynx with 13-15 neurosetae within anteroventral bract, neurosetae curved, pairs of papillae, mid-dorsal and mid-ventral to broadly spinose, lanceolate; middle row of strong acicular neurosetae, tabular bases, middle one longer than others; 2 pairs with or without arist; upper group of neurosetae arising from hooked jaws, each with 5-9 lateral teeth,. Ommatophores of prostomium with long necks [Figs 54 A, 60A, 66A31 2 Parapodia of segment 2 not particularly large, notoseta and neurosetae not forming continuous fan-like bundles [Fig 47G] 4 2 .
Stout acicular neurosetae with hairs at distal ends near bases of aristae; more posterior neurosetae with numerous subdistal spinous rows on one side [Figures 63M.T, 64M.S]. More posterior stout acicular neurosetae with single row of subdistal spines on one side [ Figure 57J ].
- fig. 35F)
- figs. 4,5)
L, 3 middle neurosetae from same; M, right elytragerous parapodium from segment 9, anterior view, acicula and spinner gland dotted; N-P, upper, middle and lower neurosetae from the same. FIGURE 9\.—Potyodontes lupinus, juvenile from Tampa Bay, Florida (USNM 45519): A, right 12th elytron from segment 23; B, right elytragerous parapodium from segment 23, anterior view, acicula and spinner gland dotted; C, right cirrigerous parapodium from segment 24, posterior view; D–F, upper, middle and lower neurosetae from the same. LJVf, upper and middle neurosetae from same; N, right elytragerous parapodium from segment 9, front view, acicula and spinning gland doaed, some spinning fibers exposed.
