Hydroides longistylaris Chen and Wu, 1980

Sun, Yanan, Ten, Harry A. & Qiu, Jian-Wen, 2012, Serpulidae (Annelida: Polychaeta) from Hong Kong, Zootaxa 3424, pp. 1-42 : 15-17

publication ID

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

DOI

https://doi.org/10.5281/zenodo.5107886

persistent identifier

https://treatment.plazi.org/id/0E31FB6E-FFCF-5866-FF23-FBACFB65FD62

treatment provided by

Plazi

scientific name

Hydroides longistylaris Chen and Wu, 1980
status

 

Hydroides longistylaris Chen and Wu, 1980

( Figure 8 View FIGURE 8 A–I)

Hydroides longistylaris Chen and Wu, 1980: 249 –250; Fiege and Sun 1999: 118 –119; Sun and Yang 2000: 124.? Hydroides cf. fusicola not Mörch, 1863 sensu Mak 1982: 603–604.

?? Hydroides cf. ezoensis not Okuda, 1934 sensu Wang and Huang 1993: 7, 10.

Material examined. AM W40546 View Materials , 10 specimens (22 ° 21 ’N, 114 ° 17 ’E, Sharp Island, on dead coral, 3–6 m, May 21, 2009).

Description. TUBE: white, trapezoidal in cross-section with two longitudinal ridges. Collar-like rings absent. External tube diameter: from 1.0 mm to 1.4 mm (n= 3, r: 1.0– 1.4, µ= 1.2 ± 0.2), lumen diameter from 0.8 mm to 1.0 mm (n= 3, µ= 0.9 ± 0.1).

BRANCHIAE: radioles on each side arranged in semicircle, numbers ranging from 6 to 13 (n= 7, µ= 8.4 ± 2.5). Interradiolar membrane absent. Terminal filament long.

PEDUNCLE: long, smooth, with a long yellowish chitinized constriction below funnel, circular in cross-section, inserted below right branchial lobe. Pseudo-operculum club-shaped in six specimens, with an inflated tip in four.

OPERCULUM: Opercular funnel with 16 to 25 radii (n= 8, µ= 20.5 ± 3.3); distally brown, tips black, pointed and curving outward. Interradial grooves 1 / 3 of funnel length. Verticil small, strongly chitinized, with 5 to 8 smooth spines (n= 8, µ= 20.5 ± 3.3), curving outward to almost parallel with funnel radii ( Figure 8 View FIGURE 8 A). Central tooth absent. Opercular length from 0.4 mm to 1.2 mm (n= 8, µ= 0.7 ± 0.3), width from 0.5 mm to 0.8 mm (n= 8, µ= 0.6 ± 0.1).

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

THORAX: with 7 chaetigers, 6 uncinigerous. Collar chaetae of two types: bayonet chaetae with two long pointed teeth and smooth distal blade, and capillaries with minute denticles ( Figure 8 View FIGURE 8 B). Subsequent chaetae of two sizes (limbate and capillary, Figure 8 View FIGURE 8 C–D). Uncini along entire thorax saw-shaped with 8 curved teeth including fang ( Figure 8 View FIGURE 8 E). Tori of similar size throughout. Ventral depression present.

ABDOMEN: total number of abdominal chaetigers varies from 52 to 64 (n= 3, µ= 51 ± 11.5). Uncini saw-shaped with 5 to 6 teeth anteriorly ( Figure 8 View FIGURE 8 F, H), rasp-shaped posteriorly with 3 to 4 rows of teeth and 10 to 12 teeth (incl. fang) in profile view ( Figure 8 View FIGURE 8 I). Chaetae flat trumpet-shaped ( Figure 8 View FIGURE 8 G). Capillary chaetae not observed. Posterior glandular pad absent.

SIZE: total worm length: 8.3 mm to 13.8 mm (n= 5, µ= 10.8 ± 2.4), thoracic width: 0.4 mm to 1.3 mm (n= 7, µ= 0.7 ± 0.3). Branchiae and operculum accounting for one fifth of entire length.

COLOUR: in ethanol white.

Habitat. Depth: 3–6 m, on deal corals.

Distribution. South China Sea. Currently reported from Chinese coasts only.

Remarks. Hydroides longistylaris can be distinguished from other Hong Kong species of the genus by the presence of an elongated peduncle with a long chitinized constriction; such a chitinized part is present in H. rectus Straughan, 1967 as well, but this taxon has one enlarged vertical spine. The present specimens agree with the descriptions of Chen and Wu (1980), Fiege and Sun (1999), except for the numbers of radioles in the branchial crown (9 versus 15–23 pairs). Mak´s (1982: 603) statement for his H. cf. fusicola "The proximal half of the peduncle is fleshy and the distal half is transparent with a central chitinous column visible inside", as well as the 7 outward curving verticil spines clearly point to H. longistylaris rather than to the temperate H. fusicola .

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Serpulidae

Genus

Hydroides

Loc

Hydroides longistylaris Chen and Wu, 1980

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

Hydroides cf. ezoensis

Wang 1993: 7
1993
Loc

Hydroides longistylaris

Sun 2000: 124
Fiege 1999: 118
Chen 1980: 249
1980