Hydroides albiceps ( Grube, 1870 ),

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

publication ID

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

DOI

http://doi.org/10.5281/zenodo.3509339

persistent identifier

http://treatment.plazi.org/id/0E31FB6E-FFC7-5870-FF23-FF06FE73F9BB

treatment provided by

Plazi

scientific name

Hydroides albiceps ( Grube, 1870 )
status

 

Hydroides albiceps ( Grube, 1870) 

( Figure 3 A –BView FIGURE 3. A – B, Figure 4View FIGURE 4 A –H)

Serpula (Eupomatus) albiceps Grube, 1870: 520  –521.

Hydroides albiceps  — Fauvel 1953: 460; Imajima 1976 a: 133 –135; Mak 1982: 601–602; Imajima and ten Hove 1984: 43 –44; Yang and Sun 1988: 311; Wang and Huang 1993: 1 –12; Fiege and Sun 1999: 112 –114.

Material examined. AM W40534View Materials, 11 specimens (22 ° 21 ’N, 114 ° 17 ’E, Sharp Island, on dead coral, 3–6 m, May 21, 2009).

Description. TUBE: white, with two longitudinal ridges. Subtrapezoid in cross-section. Medial keel absent. External tube diameter from 1.0 mm to 1.6 mm (n= 5, µ= 1.3 ± 0.3), lumen diameter from 0.6 mm to 1.2 mm (n= 5, µ= 0.9 ± 0.2).

BRANCHIAE: radioles on each side arranged in semicircle, numbers ranging from 7 to 12 (n= 6, µ = 10 ± 1.8), terminal filaments long. Interradiolar membrane absent.

PEDUNCLE: smooth, circular in cross-section, inserted just below left branchial lobe (n= 3). Constriction hardly visible. Pseudoperculum club-shaped, present in all specimens.

OPERCULUM: funnel light yellowish, bearing conical radii with blunt and slightly chitinized tip, numbers of radii ranging from 12 to 24 (n= 9,µ= 20.4 ± 3.1) ( Figure 3 A –BView FIGURE 3. A – B). Verticil milky white basally, yellowish marginally, consisting of one large vesicular spine with a dorsolateral extension on each side of its tip, and eight smaller, subequal conical spines with blunt, outward curving tip ( Figure 3 A –BView FIGURE 3. A – B). Interradial grooves almost 3 / 4 of funnel length. Lateral and internal spinules absent. Central tooth absent. Three specimens with two opercula each. Operculum length from 0.5 mm to 1.0 mm (n= 9, µ= 0.7±10.2), width from 0.5 mm to 1.0 mm (n= 9, µ= 1.6 ± 0.2).

COLLAR AND THORACIC MEMBRANES: collar high, with entire edge.

THORAX: with 7 chaetigers, 6 uncinigerous. Collar chaetae of two types: bayonet-type with two conical teeth at the base of a finely striated blade and finely striated capillaries ( Figures 4View FIGURE 4 A –B). Subsequent chaetae of two sizes (limbate and capillary, Figure 4View FIGURE 4 C). Uncini along entire thorax saw-shaped, with 7 to 8 curved teeth including anterior fang ( Figure 4View FIGURE 4 D). Tori of similar size throughout.

ABDOMEN: total number of abdominal chaetigers varies from 63 to 80 (n= 3, µ= 72.3 ± 12). Uncini saw-shaped anteriorly, with fang and 5 to 6 teeth ( Figure 4View FIGURE 4 E –F); rasp-shaped with 2 to 4 rows of teeth, fang and 8 to 9 teeth in profile view posteriorly ( Figure 4View FIGURE 4 G –H). Chaetae flat trumpet-shaped. Capillaries present posteriorly, glandular pad absent.

SIZE: total worm length: 11.4 mm to 20.0 mm (n= 3, µ= 15.6 ± 6.1), width of thorax: 0.5 mm to 1.0 mm (n= 6, µ= 0.7 ± 0.1). Branchiae and operculum accounting for one fifth of entire length.

COLOUR: in ethanol pale white or yellowish.

Habitat. Depth, 3–6 m, on dead corals.

Distribution. Widely distributed in tropical and subtropical waters of the Indian Ocean and Pacific Ocean.

Remarks. The opercula of Hydroides albiceps  show a large variability in morphology. The tips of the radii and verticil spines may range from blunt (our specimens from Hong Kong) to laterally dilated as mentioned in the literature, e.g. in the holotype. It remains to be studied if such differences are ontogenetic, or if there is a geographical component to these variations.

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Serpulidae

Genus

Hydroides

Loc

Hydroides albiceps ( Grube, 1870 )

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

Hydroides albiceps

Fiege 1999: 112
Wang 1993: 1
Yang 1988: 311
Hove 1984: 43
Imajima 1976: 133
Fauvel 1953: 460
1953
Loc

Serpula (Eupomatus) albiceps

Grube 1870: 520