Astreptosyllis acrassiseta Kudenov & Dorsey, 1982

San Martin, G & Hutchings, PA, 2006, Eusyllinae (Polychaeta: Syllidae) from Australia with the Description of a New Genus and Fifteen New Species, Records of the Australian Museum 58, pp. 257-370: 268

publication ID

2201-4349

persistent identifier

http://treatment.plazi.org/id/038287B3-A20A-FFC1-AA9D-2032FC58F83A

treatment provided by

Felipe

scientific name

Astreptosyllis acrassiseta Kudenov & Dorsey, 1982
status

 

Astreptosyllis acrassiseta Kudenov & Dorsey, 1982  

Figs 7A–I, 8A–F

Astreptosyllis acrassiseta Kudenov & Dorsey, 1982: 576   , fig. 1.

Material examined. AUSTRALIA: NEW SOUTH WALES: Off Bass Point , 34°36'S 150°54'E, 50 m, 1 Feb 1990, 1 ( AM W22995 View Materials ) GoogleMaps   . VICTORIA: Port Phillip Bay , 38°16.3'S 144°41.5'E, medium sand, 13 m, Feb 1971, 1 paratype, ( AM W18587 View Materials ) GoogleMaps   . WESTERN AUSTRALIA: Ned’s Camp, Cape Range National Park , 21°59'S 113°55'E, limestone reef near shore, fine sediment & sand from patches in reef, 1 m, coll. H.E. Stoddart, 2 Jan 1984, 1 ( AM W26780 View Materials ) GoogleMaps   .

Description. Body up to 3.1 mm long, 0.3 mm wide, with 42 chaetigers. Prostomium rectangular, 2 pairs of eyes in trapezoidal arrangement; antennae slightly club-shaped, unarticulated, usually missing; median antenna arising from posterior margin of prostomium, between posterior eyes, lateral antennae originating between anterior eyes. Palps large, similar in length to prostomium, basally totally fused ( Figs 7A, 8A), directed anteriorly, provided with distal constriction. Tufts of cilia on lateral areas of prostomium and peristomium ( Fig. 7A). Tentacular cirri and dorsal cirri of subsequent 2 segments similar to antennae; dorsal cirri from chaetiger 3 articulated ( Figs 7A, 8A), slender, slightly longer than body width, with about 6–10 elongated articles, some with 1–2 granular, dark inclusions ( Fig. 7A,C). Parapodia of anterior segments relatively broad in contrast, to posterior ones, distally truncated, with some distal incisions ( Fig. 7B); becoming elongated and conical from proventricular segments onwards, with dorsal band of long cilia ( Fig. 7C). Ventral cirri of anterior parapodia broad, shorter than parapodial length, becoming greatly elongated posteriorly, longer than parapodial length, arising from about middle of ventral side of parapodial lobes ( Fig. 7C). Anterior 1–6 chaetigers each with 8–10, sometimes 12, compound chaetae with enlarged shafts, hemigomph articulation, with short, stout, broad blades, apparently unidentate or bifid, with distal incision ( Figs 7E, 8B), about 8–15 µm long. From chaetiger 7 onwards, parapodia with 5–8 compound chaetae with shafts much slender than those of anterior chaetae, heterogomph, with fine spines on margin ( Figs 7G, 8C,D), and blades slender, unidentate, some with distal hood, with minute spines on margin, and dorsoventral gradation in length of blades within fascicle ( Fig. 8C), 27 µm in length dorsally and 15 µm in length ventrally; under SEM, margin with several rows of spines ( Fig. 8E) and distal hood composed of minute spines ( Fig. 8E). Acicula solitary, distally knobbed ( Fig. 7B,H). Dorsal simple chaetae from chaetiger 1, thick, tip tapered, blunt, covered with longitudinally striated, rounded hood ( Fig. 7D,F); under SEM, dorsal simple chaetae with “ Banksia   -like” or “artichoke-like” appearance. Ventral simple chaetae usually absent, but one specimen with single thin, smooth, filiform, ventral simple chaeta ( Fig. 7 I) on each fascicle of last parapodium. Pharynx through about 7–8 segments, with crown of 10 soft papillae ( Fig. 7A). Proventricle through about 7–8 segments, with 30–32 muscle cell rows. No specimens with anal cirri present, probably present on undamaged specimens.

Habitat. Occurring in median to coarse sand; from intertidal to 50 m.

Distribution. Australia (Victoria, New South Wales, Western Australia).

AM

Australian Museum

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Syllidae

Genus

Astreptosyllis

Loc

Astreptosyllis acrassiseta Kudenov & Dorsey, 1982

San Martin, G & Hutchings, PA 2006
2006
Loc

Astreptosyllis acrassiseta

Kudenov & Dorsey 1982: 576
1982