Hydroides operculatus ( Treadwell, 1929 )

Sun, Yanan, Ten, Harry A. & Qiu, Jian-Wen, 2012, Serpulidae (Annelida: Polychaeta) from Hong Kong, Zootaxa 3424, pp. 1-42 : 17-19

publication ID

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

DOI

http://doi.org/10.5281/zenodo.5107888

persistent identifier

http://treatment.plazi.org/id/0E31FB6E-FFD1-5864-FF23-FC8EFBF4FE91

treatment provided by

Plazi

scientific name

Hydroides operculatus ( Treadwell, 1929 )
status

 

Hydroides operculatus ( Treadwell, 1929)  

( Figure 3 View FIGURE 3. A – B C, Figure 9 View FIGURE 9 A–H)

Eupomatus operculata Treadwell, 1929: 12   .

Hydroides inornata   —Huang and Mak 1982: 780; Mak 1982: 605; Wang and Huang 1993: 1 –12. Hydroides operculatus   —Ben-Eliahu and ten Hove 1992: 44.

Material examined. AM W41406 View Materials , 3 specimens (22 ° 21 ’N, 114 ° 17 ’E, Sharp Island, on dead coral, 3–6 m, May 21, 2009); AM W40550 View Materials , 2 specimens (22 ° 25 ’N, 114 ° 16 ’E, Tolo Harbour, on artificial substrate: fouling plates in fish farm, 10 m, April 15, 2009).

Description. TUBE: white, trapezoidal in cross-section with two to three long longitudinal ridges and numerous transversal ridges. Collar-like rings absent. External tube diameter: from 0.7 mm to 1.3 mm (n= 3, µ= 1.2 ± 0.5), lumen diameter from 0.3 mm to 1.3 mm (n= 3, µ= 0.8 ± 0.5).

BRANCHIAE: radioles on each side arranged in semicircle, numbers ranging from 10 to 11 (n= 3, µ= 10.7 ± 0.6). Interradiolar membrane absent. Terminal filament long.

PEDUNCLE: long, smooth, at most slightly constricted near funnel, circular in cross-section, inserted below right branchial lobe. Pseudo-operculum short club-shaped.

OPERCULUM: numbers of radii ranging from 28 to 38 (n= 4, µ= 34.3 ± 5.1); pointed and curving outward. Interradial grooves 1 / 2 of funnel length. Verticil dark brown, consisting of 8 to 9 smooth spines (n= 5, µ= 8.8 ± 0.4), hooked, tips all curving inwards; one to three spines larger; other spines similar in shape and size; one short basal internal spinule arising from inner base of each spine ( Figure 3 View FIGURE 3. A – B C, Figure 9 View FIGURE 9 A). External and lateral spinules or knobs absent. Central tooth absent. Opercular length from 0.9 mm to 1.3 mm (n= 5, µ= 1.1 ± 0.2), width from 0.5 mm to 1.0 mm (n= 5, µ= 0.7 ± 0.2).

COLLAR AND THORACIC MEMBRANES: collar high, thoracic membranes well-developed, apron present.

THORAX: with 7 chaetigers, and 6 uncinigerous. Collar chaetae of two types: bayonet chaetae with two pointed teeth at base of smooth blade, and capillaries with minute denticles ( Figure 9 View FIGURE 9 B). Subsequent chaetae of two sizes ( Figure 9 View FIGURE 9 C). Uncini along entire thorax saw-shaped with 5 curved teeth including anterior fang ( Figure 9 View FIGURE 9 D). Tori of similar size throughout. Ventral depression present.

ABDOMEN: total number of abdominal chaetigers varies from 64 to 79 (n= 2, µ= 71.5 ± 10.6). Uncini sawshaped with 4 to 5 teeth anteriorly ( Figure 9 View FIGURE 9 E–F); rasp-shaped posteriorly with 2 to 3 rows of teeth and 6 to 7 teeth in profile view ( Figure 9 View FIGURE 9 G–H). Chaetae flat trumpet-shaped. Capillary chaetae not observed. Posterior glandular pad absent.

SIZE: total worm length: 18.0 mm to 28.0 mm (n= 4, µ = 23.8 ± 4.2), thoracic width: 0.8 mm to 1.0 mm (n= 4, µ= 0.9 ± 0.1). Branchiae and operculum accounting for one fifth of entire length.

COLOUR: in ethanol white.

Habitat. Depth: 3 m, on dead corals and artificial substrate in fish farm.

Distribution. Indian-Pacific Ocean, Lessepsian migrant in E. Mediterranean.

Remarks. One of our specimens has 9 verticil spines, three of them large, which is regarded to be an opercular variation. Hydroides operculatus   has been recorded as a ship-transported species (Bastida-Zavala & ten Hove 2002). It is recorded herein from fouling communities of the fish farm in Tolo Harbour.

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Serpulidae

Genus

Hydroides

Loc

Hydroides operculatus ( Treadwell, 1929 )

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

Hydroides inornata

Wang 1993: 1
1993
Loc

Eupomatus operculata

Treadwell 1929: 12
1929