Comprehensive Description

Read full entry

Description

Holotype, entire animal, with 25 chaetigers, length 1.9 mm with palps but without anal cirri; width at sixth chaetiger 250 µm without parapodia, 300 µm with parapodia. Body small, slender, widest at level of proventricle (Fig. 1). Dorsal papillation on anterior chaetigers irregular, after proventricle in four longitudinal rows: two mid-dorsal rows with two papillae per segment, lateral rows with three papillae near dorsal cirri (Fig. 2a). Ventrum without visible papillation. Prostomium wider than long with 4 coalescent lensed eyes in trapezoidal arrangement. Anterior eyespots absent. Antennae pyriform with bulbous bases and elongated tips, median antenna 40 µm long, lateral ones 33 µm, longer than prostomium and palps together. Median antenna inserted between anterior pair of eyes, lateral ones attached on anterior margin of prostomium (Fig. 1). Palps directed ventrally, fused along their length, with a dorsal notch and few small papillae. Peristomium indistinct, dorsal fold partly covering prostomium. One pair of tentacular cirri, shaped like antennae but shorter (23 µm). Second chaetiger without dorsal cirri but with large papilla instead. Dorsal cirri similar in shape and length to tentacular cirri, anteriorly as long as parapodial lobes (23 µm), posteriorly slightly longer (28 µm). Ventral cirri conical, half as long as parapodial lobe, originating at bases of parapodia. Parapodial lobes triangular, with small papilla on each side of distal end. Parapodial glands with fibrillar material and with conical opening; from fourth chaetiger. Anterior parapodia with 4-5, rarely with 6 falcigers per fascicle; blades slender, unidentate with small subdistal spine and strong serration on 1-2 dorsalmost falcigers (Figs 2b-d, 3a). Dorso-ventral gradation in length of blades, dorsal ones maximally 14 µm, ventral ones 10 µm. Posteriorly, dorsal blades of similar length (13 µm), but stouter and more curved with robust subdistal spine and strong serration as long as subdistal spine (Figs 2e, f, 3b, c). Dorsalmost falciger posteriorly thicker than remaining ones in fascicle. Blades of ventral falcigers similar throughout body (Fig. 2g). All shafts with fine serration (Fig. 2c). Dorsal simple chaeta from chaetiger 1, subdistally serrated (Figs 2h, 4a). Ventral simple chaeta on posterior chaetigers, sigmoid, smooth (Fig. 4b). Anteriorly two aciculae per parapodium, one distally bent at right angle, acuminate tip curved upwards, the other straight and blunt (Fig. 4c); posteriorly only one acicula of the former type per parapodium. Pharynx occupying three chaetigers. Width more than ? of width of proventricle. Pharyngeal tooth located on anterior margin, surrounded by a crown of soft papillae. Proventricle in chaetigers 3-4 (120 µm long) with 15-17 muscle cell rows. Pygidium papillated, with two cirriform anal cirri twice as long as dorsal cirri (60 µm) (Fig. 1).

Trusted

Creative Commons Attribution 3.0 (CC BY 3.0)

© Sarah Faulwetter, Georgios Chatzigeorgiou, Bella S. Galil, Artemis Nicolaidou, Christos Arvanitidis

Source: ZooKeys

Belongs to 0 communities

This taxon hasn't been featured in any communities yet.

Learn more about Communities

Disclaimer

EOL content is automatically assembled from many different content providers. As a result, from time to time you may find pages on EOL that are confusing.

To request an improvement, please leave a comment on the page. Thank you!