Hydroides diramphus Mörch, 1863

Sun, Yanan, Ten, Harry A. & Qiu, Jian-Wen, 2012, Serpulidae (Annelida: Polychaeta) from Hong Kong, Zootaxa 3424, pp. 1-42 : 7-11

publication ID

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

DOI

http://doi.org/10.5281/zenodo.5107876

persistent identifier

http://treatment.plazi.org/id/0E31FB6E-FFC7-587C-FF23-F9F8FF4AFAA2

treatment provided by

Plazi

scientific name

Hydroides diramphus Mörch, 1863
status

 

Hydroides diramphus Mörch, 1863  

( Figure 2 A View FIGURE 2. A , Figure 5 View FIGURE 5 A–I)

Hydroides (Eucarphus) dirampha Mörch, 1863: 379   .

Hydroides lunulifera   — Day 1967: 807.

Hydroides dirampha   —Huang and Mak 1982: 780; Mak 1982: 600, 602; Morton and Morton 1983: 278; Wang and Huang 1993: 1 –12.

Hydroides diramphus   —Bastida-Zavala and ten Hove 2003: 83–86; Ben-Eliahu and ten Hove 2011: 17 –19.

Material examined. AM W40539 View Materials , 10 specimens (22 ° 25 ’N, 114 ° 16 ’E, Tolo Harbour, on the submerged side of the floating Styrofoam boxes in the fish farm, 3–10 m, April 15, 2009); AM W41404 View Materials , 3 specimens (22 ° 17 ’N, 114 ° 11 ’E, Victoria Harbour, on pier concrete columns, 0–1 m, May 20, 2009).

Description. TUBE: white, circular in cross-section; longitudinal ridges, if present, very low, collar-like rings absent. Transversal ridges present throughout the whole tube. External tube diameter from 1.4 mm to 2.6 mm (n= 8, µ= 1.9 ± 0.4), lumen diameter from 1.1 mm to 2.0 mm (n= 8, µ= 1.5 ± 0.3).

BRANCHIAE: radioles on each side arranged in semicircle, numbers ranging from 14 to 18 (n= 8, µ= 15.6 ± 1.6). Interradiolar membrane absent. Terminal filament long.

PEDUNCLE: smooth, circular in cross-section, inserted below left branchial lobe in 12 specimens, right in 1 specimen. Constriction well-defined. Pseudoperculum club-shaped with an inflated tip, present in all specimens.

OPERCULUM: funnel radii with pointed tip, numbers ranging from 30 to 42 (n= 8 µ= 35.5 ± 5.6). Interradial grooves almost 3 / 4 of funnel length. Verticil with 12 to 18 yellowish spines (n= 8, µ= 14.3 ± 3.2), straight, all spines similar in size and shape. Tip of spines T-shaped and flattened ( Figure 5 View FIGURE 5 A), each having a basal internal spinule. External and lateral spinules absent. Central tooth absent. Length of operculum from 0.8 mm to 1.8 mm (n= 8, µ= 1.1 ± 0.4), width from 1.1 mm to 1.8 mm (n= 8, µ= 1.3 ± 0.3).

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

THORAX: with 7 chaetigers, 6 uncinigerous. Collar chaetae of two types: bayonet chaetae with two long pointed teeth and smooth distal blade ( Figure 5 View FIGURE 5 B), and capillaries with minute denticles ( Figure 5 View FIGURE 5 C). Subsequent chaetae of two sizes (limbate and capillary, Figure 5 View FIGURE 5 D). Uncini along entire thorax saw-shaped with 7 curved teeth including anterior fang ( Figure 5 View FIGURE 5 E). Tori of similar size throughout, approaching each other posteriorly, leaving a ventral depression.

ABDOMEN: total number of abdominal chaetigers varies from 64 to 103 (n= 8, µ= 85.3 ± 12.9). Uncini sawshaped throughout with fang and 4 teeth anteriorly, increasing to 8 to 9 teeth (incl. fang) posteriorly ( Figure 5 View FIGURE 5 F–H). Chaetae flat trumpet-shaped ( Figure 5 View FIGURE 5 I). Capillaries present posteriorly, glandular pad absent.

SIZE: total worm length: 12.0 mm to 32.0 mm (n= 8, µ = 19.4 ± 8.2), thoracic width: 1.2 mm to 2.0 mm (n= 8, µ= 1.6 ± 0.5). Branchiae and operculum accounting for one fifth of entire length.

COLOUR: yellow to light brown.

Habitat. Depth: 1–10 m, on pier piles or other artificial substrate, fouling.

Distribution. Circum(sub)tropical.

Remarks. Hydroides diramphus   has been reported as a fouling species, being ship-transported easily (Bastida- Zavala & ten Hove 2003) and present in both polluted and non polluted areas ( Bastida-Zavala 2008). In Hong Kong, Hydroides diramphus   occasionally occurs in the fouling community of local fish farms, co-occurring with Hydroides sanctaecrucis   and Hydroides elegans   on various submerged surfaces, with the latter species being dominant.

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Serpulidae

Genus

Hydroides

Loc

Hydroides diramphus Mörch, 1863

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

Hydroides diramphus

Hove 2011: 17
2011
Loc

Hydroides dirampha

Wang 1993: 1
Morton 1983: 278
1983
Loc

Hydroides lunulifera

Day 1967: 807
1967
Loc

Hydroides (Eucarphus) dirampha Mörch, 1863 : 379

Morch 1863: 379
1863