Spirobranchus kraussii ( Baird, 1865 )

Sun, Yanan, Ten, Harry A. & Qiu, Jian-Wen, 2012, Serpulidae (Annelida: Polychaeta) from Hong Kong, Zootaxa 3424, pp. 1-42 : 28-30

publication ID

http://doi.org/ 10.5281/zenodo.213363

DOI

http://doi.org/10.5281/zenodo.5107934

persistent identifier

http://treatment.plazi.org/id/0E31FB6E-FFDA-586B-FF23-F885FF71FCF2

treatment provided by

Plazi

scientific name

Spirobranchus kraussii ( Baird, 1865 )
status

 

Spirobranchus kraussii ( Baird, 1865)  

( Figure 13 View FIGURE 13 A–F)

Placostegus cariniferus   var. Kraussii   Baird, 1865: 14.

Pomatoleios kraussii   — Day 1967: 800 –801; Morton and Morton 1983: 88 –89; Wang and Huang 1993: 1 –12; Tan and Morton 1998: 392 –401; Fiege and Sun 1999: 130 –131; Sun and Yang 2001 b: 213 –214; Ben-Eliahu and ten Hove 2011: 43 –45. Pomatoceros triqueter   not ( Linnaeus, 1758), Morton and Morton 1983: 77 (error for Pomatoleios kraussii   ).

Material examined. AM W41410 View Materials , 10 specimens (22 ° 21 ’N, 114 ° 15 ’E, Hebe Haven, rocky intertidal, 0–1 m, May 25, 2009).

Description. TUBE: Tube white to blue, triangular in cross-section, with medial keel projecting into flap over the entrance. External tube diameter: from 1.9 mm to 2.4 mm (n= 3, µ= 2.2 ± 0.3), lumen diameter from 1.5 mm to 2.0 mm (n= 3, µ = 1.8 ± 0.3).

BRANCHIAE: radioles on each lobe arranged in circles, connected by interradiolar membrane for about one third of their length; numbers ranging from 21 to 26 (n= 5, µ= 23.4 ± 1.9). Terminal filaments short. Branchial eyes not observed.

PEDUNCLE: subtriangular in cross-section, inserted just below left branchial lobe in all specimens. Pair of lateral wings proximal to opercular ampulla present, constriction not observed. Pseudo-operculum absent.

OPERCULUM: operculum slightly concave, talon absent. Opercular length from 3.8 mm to 4.6 mm (n= 5, µ= 4.3 ± 0.3), width from 0.9 mm to 1.2 mm (n= 5, µ= 1.1 ± 0.1).

COLLAR AND THORACIC MEMBRANES: collar high, with entire edge. Thoracic membranes forming apron across anterior abdominal chaetigers.

THORAX: with 6 chaetigers. Collar chaetae absent. Thoracic chaetae of two sizes, largest (limbate) finely serrated ( Figure 13 View FIGURE 13 A). Uncini along entire thorax saw-shaped, with 9 curved teeth and gouged fang ( Figure 13 View FIGURE 13 B). Tori of similar size along thorax, approaching each other posteriorly, leaving ventral depression.

ABDOMEN: total number of abdominal chaetigers varies from 68 to 86 (n= 5, µ= 78.8 ± 0.2). Uncini sawshaped throughout, with 8 to 9 teeth and gouged peg ( Figure 13 View FIGURE 13 C, E–F). Chaetae true trumpet-shaped, abruptly bent, distally with two rows of denticles separated by a groove forming long pointed tip ( Figure 13 View FIGURE 13 D). Posterior abdominal capillaries absent.

SIZE: total worm length: 7.0 mm to 11.0 mm (n= 5, µ= 9.1 ± 1.5), thoracic width: 1.5 mm to 1.8 mm (n= 5, µ= 1.7 ± 0.1). Branchiae and operculum accounting for one fourth of entire length.

COLOUR: in ethanol operculum bluish, peduncle and wings light blue with dark blue pigmentation, branchial radioles banded blue and white, thorax and anterior abdomen blue, posterior abdomen colourless.

Habitat. Depth: 1 to 3 m, on rocks in higher intertidal zone.

Remarks. Spirobranchus kraussii   has been reported as one of the dominant species in fouling communities in Hong Kong, forming intertidal aggregations ( Wang and Huang 1993, as Pomatoleios kraussii   ).

Distribution. Widely distributed in the Indo-Pacific; South Africa; Lessepsian migrant to the Mediterranean Levant.

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Serpulidae

Genus

Spirobranchus

Loc

Spirobranchus kraussii ( Baird, 1865 )

Sun, Yanan, Ten, Harry A. & Qiu, Jian-Wen 2012
2012
Loc

Pomatoleios kraussii

Hove 2011: 43
Sun 2001: 213
Fiege 1999: 130
Tan 1998: 392
Wang 1993: 1
Morton 1983: 88
Morton 1983: 77
Day 1967: 800
1967
Loc

Placostegus cariniferus

Baird 1865: 14
1865