Hydroides elegans ( Haswell, 1883 )

Sun, Yanan, Ten, Harry A. & Qiu, Jian-Wen, 2012, Serpulidae (Annelida: Polychaeta) from Hong Kong, Zootaxa 3424, pp. 1-42 : 11-13

publication ID

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

DOI

https://doi.org/10.5281/zenodo.5107878

persistent identifier

https://treatment.plazi.org/id/0E31FB6E-FFCB-587A-FF23-FACEFEB0FC64

treatment provided by

Plazi

scientific name

Hydroides elegans ( Haswell, 1883 )
status

 

Hydroides elegans ( Haswell, 1883)

( Figure 2 View FIGURE 2. A B, Figure 6 View FIGURE 6 A–H)

Eupomatus elegans Haswell, 1883: 633 .

Hydrodies [sic!] multispinosa not Marenzeller, 1885 sensu Lee and Trott 1973: 103.

Hydroides norvegica not Gunnerus sensu Day 1967: 805; Greene and Morton 1977: 231 –232, 235– 236.

Hydroides elegans — Imajima 1976 b: 237 –238; Huang and Mak 1982: 767–768, 771, 775 – 780; Mak 1982: 602–603; Mak and Huang 1982: 817–822; Morton and Morton 1983: 77, 88, 90, 121 – 122; Wang and Huang 1993: 1 –12; Qiu and Qian 1997: 79 –88; 1998: 127–134; Tan and Morton 1998: 392 –401; Bastida-Zavala and ten Hove 2002: 164–165; Ben-Eliahu and ten Hove 2011: 19 –25 [for partial, complicated synonymy].

Hydroides sp.— Thompson et. al. 1982: 748, 756.

Protohydroides elegans — Shin 1982: 170.

Material examined. AM W41405 View Materials , 4 specimens (22 ° 21 ’N, 114 ° 17 ’E, Sharp Island, on dead coral, 3m, May 21, 2009); AM W40540 View Materials , 20 specimens (22 ° 25 ’N, 114 ° 16 ’E, Tolo Harbour, on artificial substrate: fouling plates in the fish farm, 10 m, April 15, 2009)

Description. TUBE: white, circular in cross-section, fragmentary, with numerous transversal ridges, without longitudinal ridges. Collar-like rings absent. External tube diameter from 0.7 mm to 1.3 mm (n= 8, µ=1.0± 0.2), lumen diameter from 0.5 mm to 1.0 mm (n= 8, µ= 0.8 ± 0.2).

BRANCHIAE: radioles on each side arranged in semicircle, numbers ranging from 8 to 14 (n= 8, µ=1.0± 0.2). Interradiolar membrane absent. Terminal filament about 1 / 5 of whole radiolar length.

PEDUNCLE: long, smooth, circular in cross-section, inserted below left branchial lobe in five specimens, right in eighteen specimens. Constriction absent. Pseudoperculum present in 18 specimens, with an inflated tip or a primary operculum (of the Serpula - type) only.

OPERCULUM: numbers of radii ranging from 22 to 27 (n= 8, µ= 24.5 ± 2.4), radii with rounded, non-chitinized tips. Interradial grooves 2 / 3 of funnel length. Verticil with 9 to 16 straight, pointed spines (n= 8, µ = 10.8 ±2.0); spines yellowish, similar in shape, with 3 to 4 pointed lateral spinules on both sides and 1 to 3 internal spinules ( Figure 6 View FIGURE 6 A). Central tooth present in fourteen specimens, absent in eight, similar in shape and size to lateral spinules. External spinules absent. Opercular length from 0.4 mm to 0.9 mm (n= 8, µ= 0.7 ± 0.2), width from 0.4 mm to 0.9 mm (n= 8, µ= 0.7 ± 0.2).

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

THORAX: with 7 chaetigers, 6 uncinigerous. Collar chaetae of two types: bayonet chaetae with two welldefined denticulate zones delimited by a conspicuous notch, distal one with rows of tiny serrations, proximal zone with four large pointed teeth and many smaller denticles proximally ( Figure 6 View FIGURE 6 B); and finely striated capillaries. Subsequent chaetae of two sizes (limbate and capillary, Figure 6 View FIGURE 6 C–D). Uncini along entire thorax saw-shaped with 6 curved teeth ( Figure 6 View FIGURE 6 E). Tori of similar size throughout.

ABDOMEN: total number of abdominal chaetigers varies from 26 to 68 (n= 8, µ= 45.4 ± 13.9). Uncini sawshaped with fang and 3 to 4 teeth anteriorly, increasing to 5 to 6 in the middle of the abdomen ( Figure 6 View FIGURE 6 F–G); raspshaped posteriorly with 2 to 3 rows of teeth and 7 to 8 teeth (incl. fang) in profile view. Chaetae flat trumpetshaped. Capillaries present posteriorly ( Figure 6 View FIGURE 6 H), glandular pad absent.

SIZE: total worm length: 8.1 mm to 25.5 mm (n= 8, µ= 12.7 ± 5.9), thoracic width: 0.6 mm to 1.1 mm (n= 8, µ= 0.9 ± 0.2). Branchiae and operculum accounting for one fifth of entire length.

COLOUR: in ethanol yellowish.

Habitat. Depth: 3–10 m, on dead coral, artificial substrate of the fish farm. Fouling.

Distribution. Widely distributed in tropical and subtropical waters around the world.

Remarks. Hydroides elegans is an invasive and fouling species ( Zibrowius 1994; Bastida-Zavala & ten Hove 2002). It is the most common serpulid in Hong Kong. Structures submerged in eastern Hong Kong waters for several months during winter and spring can be coated by H. elegans with a thickness up to 3.8 cm and wet-weight reaching 12.5 kg m - 2 ( Wang & Huang 1993). Material from Sharp Island seemed to have slightly higher numbers of lateral spinules (4–6) to the verticil spines, the relevance of this occasional observation should be ascertained from further study.

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Serpulidae

Genus

Hydroides

Loc

Hydroides elegans ( Haswell, 1883 )

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

Hydroides

Thompson 1982: 748
1982
Loc

Protohydroides elegans

Shin 1982: 170
1982
Loc

Hydroides elegans

Hove 2011: 19
Tan 1998: 392
Qiu 1997: 79
Wang 1993: 1
Morton 1983: 77
Imajima 1976: 237
1976
Loc

Hydrodies [sic!] multispinosa

Lee 1973: 103
1973
Loc

Hydroides norvegica

Greene 1977: 231
Day 1967: 805
1967
Loc

Eupomatus elegans

Haswell 1883: 633
1883