Stylomma palmatum ( Quatrefages, 1866 )

Capa, María & Murray, Anna, 2015, A taxonomic guide to the fanworms (Sabellidae, Annelida) of Lizard Island, Great Barrier Reef, Australia, including new species and new records, Zootaxa 4019 (1), pp. 98-167: 153-155

publication ID

http://dx.doi.org/10.11646/zootaxa.4019.1.8

publication LSID

lsid:zoobank.org:pub:8C14F828-F8FB-4783-928B-399B33B4246D

persistent identifier

http://treatment.plazi.org/id/039D9472-FFEC-2A0D-DA94-0BFED7B7CD16

treatment provided by

Plazi

scientific name

Stylomma palmatum ( Quatrefages, 1866 )
status

 

Stylomma palmatum ( Quatrefages, 1866) 

( Fig. 22 View Figure G–J)

Sabella palmata Quatrefages, 1866: 453  .

Sabella monophthalma Augener, 1922: 35  .

Stylomma palmatum  .— Knight-Jones 1997: 322; Knight-Jones & Perkins 1998: 451 –452, figs. 29, 31A–B; Capa 2008: 321 – 324, figs 10 A–D, 11.

Material examined. Queensland, Lizard Island: AM W. 41156, AM W. 36455, AM W. 36456, Watsons Bay, 14 ° 39 ′ 26 ′′S, 145 ° 27 ′03′′E, coral rubble, 4.5 m, 28 Aug 2010.

Other material examined. Queensland, Heron Island: AM W. 41154, AM W. 41155, lagoon, 23 ° 26 ′ 30 ′′S, 151 ° 54 ′02′′E, coral rubble, 1–15 m, 19 Nov 2010.

Description of material examined. Largest complete specimen 43 mm long (including crown of 13 mm length), 2.5 mm wide, with 8 thoracic and> 100 abdominal chaetigers. Live specimens are mainly white, with the base of the radiolar crown bright white with conspicuous brown markings. Radioles have longitudinal dark lines basally, and transverse bands on radioles and pinnules on the distal 2 / 3 rds of their length ( Fig. 22 View Figure G–H, J). Body without colour pigment. ( Fig. 22 View Figure G, I). Interramal eyespots are present in both thorax and abdomen. Preserved specimens maintain same pigmentation pattern. Radiolar crown rigid, with long semicircular basal lobes, with rounded and long dorsal basal flanges joined dorsally with a “press-stud” structure ( Fig. 22 View Figure G, J). Radioles with smooth radiolar flanges, broader distally; basal membrane present. Distal compound radiolar eye on each radiole, over a stalk, all similar in size. Numerous small vacuolated cells (over 20) support each radiole basally, with other smaller ones extending into and supporting flanges at the distal end. Dorsal lips with long pointed radiolar appendage; pinnular appendages absent. Ventral lips and parallel lamellae present, ventral sacs inside crown. Posterior peristomial ring collar with dorsal margins separated by a wide gap, oblique lateral margins increasing in length ventrally, ventral lappets separated by a midventral incision ( Fig. 22 View Figure G, I). Glandular ridge on anterior chaetigers absent. Thoracic ventral shields in contact with neuropodial tori, or separated by a small gap ( Fig. 22 View Figure I). Collar chaetae arranged in two short oblique rows, superior row with elongate narrowly-hooded chaetae and inferior row with spine-like chaetae. Thoracic notopodia conical, with chaetae arranged in longitudinal bundles; superior thoracic chaetae elongate narrowly-hooded, inferior spine-like. Thoracic uncini with over 10 rows of minute teeth above main fang, covering half its length. Companion chaetae with dentate appearance on proximal half of hood, distally asymmetrical. Abdominal neuropodia conical, lacking superior abdominal chaetae, inferior abdominal chaetae spine-like, arranged in a C-shaped to a spiral arrangement. Abdominal uncini similar to thoracic, but with slightly larger teeth above main fang. Pygidium a raised lobed rim with some lateral patches of pigment. Pygidial eyes and pygidial cirrus absent. Tube not studied.

Remarks. This species is easily distinguished from any other sabellid by the presence of single distal stalked eyes on all radioles, autapomorphy of the species. Moreover, it also has a distinctive pigmentation pattern as well as a robust and rigid radiolar crown with the two lobes joined by a press-stud structure. First record for Lizard Island.

Habitat. Dead coral and coral rubble.

Type locality. Kilinailau Islands, Micronesia.

Distribution. French Polynesia, Papua New Guinea, Queensland (Cape York, Lizard Island).

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Sabellidae

Genus

Stylomma

Loc

Stylomma palmatum ( Quatrefages, 1866 )

Capa, María & Murray, Anna 2015

2015
Loc

Stylomma palmatum

Capa 2008: 321
Knight-Jones 1998: 451
Knight-Jones 1997: 322

1997
Loc

Sabella palmata

Quatrefages 1866: 453

Loc

Sabella monophthalma

Augener 1922: 35