dcsimg

Comprehensive Description

provided by Smithsonian Contributions to Zoology
Psammolyce horsti

Psammolyce flava.—Horst, 1913:189; 1917:125, pl. 27: figs. 9, 10 [not Kinberg, 1856].

MATERIAL EXAMINED.—INDO-PACIFIC OCEAN: Indonesia: Anchorage off Djangkar, Java, 07°46′S, 114°30.5′E, 330 m, mud, R/V Siboga sta 4, 10 Mar 1899, holotype (ZMA 1206, as P. flava by Horst).

TYPE MATERIAL.—The holotype, and only available specimen, is an anterior fragment of about 90 segments, 62 mm long and 6 mm wide, with setae. It is a very relaxed specimen and in rather poor condition.

DESCRIPTION.—Middorsum in anterior part of body sparsely papillated, thickly papillated more posteriorly, including 3 groups of papillae arranged in transverse row on each segment. Ventrum densely papillated with short papillae. First pair of elytra missing; anterior elytra subreniform to oval, with long papillae on borders, except on anterior borders, long papillae and low adhesive papillae on surfaces (Figure 5E,F); middle elytra with medial projections with numerous flat-topped adhesive papillae, some with large particles attached; foreign material more concentrated in central transverse areas on elytra (Figure 5G).

Prostomium and tentaculophores fused basally. Prostomium rounded, mostly hidden by segment II; eyes not visible; large ceratophore of median antenna bulbous basally, style missing; long tentaculophores each with single aciculum, dorsal tentacular cirrus (missing), long ventral tentacular cirrus, and 2 bundles of numerous, very long, finely spinous, capillary notosetae; palps emerging ventral and lateral to tentaculophores, long, tapering, and extending to tips of notosetae, with shell-like inner palpal sheaths; small subulate lateral antennae on inner bases of tentaculophores (Figure 4A,B).

Middorsum of segment II truncate anteriorly, with group of papillae between large elytrophores (Figure 4A). Biramous parapodium with short, conical notopodium with large notopodial flange enclosing long notosetae; larger subconical neuropodium with long, cirriform clavate appendage, papillate on basal half; ventral buccal cirrus very long, extending far beyond tip of neuropodium (Figure 4C; Horst, 1917, pl. 27: fig. 9). Neurosetae compound, slender, upper ones with stems with spinous rows and blades long, slender, tapering to entire curved tips; lower neurosetae with stems with fewer spinous rows and blades tapering to furcate tips (Figure 4D; Horst, 1917, pl. 27: fig. 10). Parapodia of segment III without dorsal cirri; branchiae thick, digitiform; neurosetae similar to those on following segments, except lower ones with more slender long blades.

Biramous parapodia with short, subconical notopodia, with large subdistal flanges encircling numerous notosetae (exact shape of flanges questionable, due to flaccid specimen); larger neuropodia subconical, papillate distally, enclosed in 3 papillate bracts (as in P. flava); long papillae also on anterior and posterior lower sides of neuropodia; ventral cirri with short cirrophores with few short papillae, styles with basal knobs on upper sides, and tips extending to level of ventro-anterior bracts (Figure 5A,C). Compound neurosetae with stems smooth; blades rather short, with long, furcate tips, with articulations more or less distinct (Figure 5B). Neurosetae of middle parapodia stouter and blades mostly with entire tips, few with short split tips, and few with long furcate tips; articulations distinct, faint, or absent (Figure 5D).

ETYMOLOGY.—The species is named for R. Horst, who first reported and provided a description of the specimen under the name of the closely related Psammolyce flava.

COMPARISONS.—In P. horsti the compound neurosetae in the middle region have the blades mostly with entire tips and the articulations to the stems are distinct, faint, or absent, whereas in P. flava the blades of the compound neurosetae all have furcate tips and the articulations are distinct. In P. horsti the tips of the long terminal appendages on the neuropodia of segment II are clavate, whereas in P. flava the tips are cylindrical.

DISTRIBUTION.—Indo-Pacific Ocean: Java, Indonesia; in 330 meters.

Neopsammolyce, new genus

TYPE SPECIES.—Psammolyce petersi Kinberg, 1856. Gender: feminine.

DIAGNOSIS.—Pelogeniinae without dorsal cirri on segment III. Neuropodia of segment II without long terminal appendages. Compound neurosetae falcigerous, with blades short, with bifid tips (some entire). First pair of elytra not deeply incised anteriorly (except in N. occidentalis); posterior elytra with medial processes, without posterior processes (except in N. spinosa). Prostomium without lateral ctenidia on ceratophore of median antenna. Upper lip with or without facial tubercle. Elytral and neuropodial filiform papillae not articulated (except in N. catenulata).

ETYMOLOGY.—Neo (new) plus psammolyce, indicating some differences from Psammolyce.
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bibliographic citation
Pettibone, Marian H. 1997. "Revision of the sigalionid species (Polychaeta) referred to Psammolyce Kinberg, 1856, Pelogenia Schmarda, 1861, and belonging to the Subfamily Pelogeniinae Chamberlin, 1919." Smithsonian Contributions to Zoology. 1-89. https://doi.org/10.5479/si.00810282.581