Comprehensive Description

provided by Smithsonian Contributions to Zoology
Malmgreniella berkeleyorum

Harmothoe lunulata.—Berkeley and Berkeley, 1945:321; 1948:11. [Not Delle Chiaje, 1830.]

MATERIAL EXAMINED.—EASTERN PACIFIC OCEAN: British Columbia: Gulf of Georgia, Mittelnacht Island off east coast of Vancouver Island, 183 m, 16 Jan 1929, E. and C. Berkeley, collectors, holotype (USNM 55039).

DESCRIPTION.—Holotype, female with eggs, with 30 segments, last 8 smaller, regenerating, 11 mm long, 4 mm wide including setae. Body dark. Elytra 14 pairs, on usual segments, last pair on segment 29 small (probably 15 pairs when complete). Elytra oval and subreniform, dark, opaque, darker around area of attachment, showing “veins,” with large group of microtubercles on anterior part, except first pair (Figure 41H–J).

Bilobed prostomium with anterior lobes wide, subtriangular, eyes rather small, anterior pair anterolateral, anterior to greatest width of prostomium, slightly larger than posterodorsal pair; median antenna with large ceratophore in anterior notch, style missing; ceratophores of lateral antennae inserted ventrally, converging midventrally, with styles short, subulate, papillate; palps stout, tapered; tentaculophores lateral to prostomium, each with 0–1 seta on inner side; tentacular cirri longer than prostomium, with short papillae and filamentous tips, dorsal ones longer than ventral ones (Figure 41A). Segment 2 with first pair of large elytrophores, biramous parapodia, and long ventral buccal cirri, similar to tentacular cirri (Figure 41A,B); notosetae similar to those following; neurosetae more slender than those following, otherwise similar (Figure 41C).

Biramous parapodia with notopodium short, rounded, with projecting acicular lobe on lower side; longer neuropodium with subconical presetal acicular lobe continuing distally as subtriangular supraacicular process and shorter, rounded postsetal lobe (Figure 41B,D,E). Short and long notosetae forming radiating bundle, stouter than neurosetae, with double row of minute spines along one border and tapered blunt bare tip (Figure 41F). Neurosetae forming fan-shape bundle, rather slender, upper ones (5 or so) with longer spinose region and long, bare, slender, slightly knobbed tip; middle ones with shorter spinose region and bifid tip with extra long secondary tooth; lower ones (10 or so) with shorter spinose region and slightly knobbed bare tip (Figure 41C,G). Dorsal cirri with cylindrical cirrophore with style long, papillate, tapering distally and extending beyond tips of neurosetae; dorsal tubercles nodular; ventral cirri short, subulate, papillate (Figure 41E).

ETYMOLOGY.—The species is named for Edith and Cyril Berkeley, in recognition of their early work on the polychaetes of British Columbia.

DISTRIBUTION.—Eastern Pacific Ocean from British Columbia, in 183 meters.
bibliographic citation
Pettibone, Marian H. 1993. "Scaled polychaetes (Polynoidae) associated with ophiuroids and other invertebrates and review of species referred to Malmgrenia McIntosh and replaced by Malmgreniella Hartman, with descriptions of new taxa." Smithsonian Contributions to Zoology. 1-92. https://doi.org/10.5479/si.00810282.538