Hydroides exaltatus ( Marenzeller, 1885 )

Sun, Yanan, Ten, Harry A. & Qiu, Jian-Wen, 2012, Serpulidae (Annelida: Polychaeta) from Hong Kong, Zootaxa 3424, pp. 1-42 : 13-15

publication ID

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

DOI

http://doi.org/10.5281/zenodo.5107880

persistent identifier

http://treatment.plazi.org/id/0E31FB6E-FFCD-5878-FF23-FB8FFBE0FE02

treatment provided by

Plazi

scientific name

Hydroides exaltatus ( Marenzeller, 1885 )
status

 

Hydroides exaltatus ( Marenzeller, 1885)  

( Figure 7 View FIGURE 7 A–I)

Eupomatus exaltatus Marenzeller, 1885: 217   .

Hydroides exaltata   — Imajima 1976 a: 127 –128; Mak 1982: 603; Imajima and ten Hove 1984: 48; 1986: 4–5; Sun and Yang 2000: 121; Fiege and Sun 1999: 116; Pillai 2009: 115 –116.

Material examined. AM W40542 View Materials , 9 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 1.7 mm to 2.3 mm (n= 3, µ=2.0± 0.4), with lumen diameter from 1.3 mm to 1.7 mm (n= 3, µ= 1.4 ± 0.2).

BRANCHIAE: each lobe with 10 to 15 radioles (n= 5, µ= 12.4 ± 1.9) arranged in semicircle. Interradiolar membrane absent. Terminal filament long, about 1 / 5 of whole radiolar length.

PEDUNCLE: smooth, circular in cross-section, inserted below left branchial lobe. Constriction well-defined, chitinized. Pseudoperculum short, club-shaped.

OPERCULUM: numbers of radii ranging from 21 to 27 (n= 7, µ= 24.4 ± 2.2); tips yellowish, pointed, chitinized, curving outward. Interradial grooves 1 / 2 to 2 / 3 of funnel length. Verticil consisting of 7 to 9 spines (n= 7, µ= 7.7 ± 1.1). The most dorsal one much larger, expanding upward before curving inward, tapering to a pointed tip, a slight depression present externally on each lateral side beneath expanded part. Remaining smaller spines similar in shape and size, all strongly curving outward, tapering to a pointed tip ( Figure 7 View FIGURE 7 A). All spines with a small internal spinule arising from the base of spine. Central tooth absent. Opercular length from 0.8 mm to 2 mm (n= 6, µ= 1.4 ± 0.5), width from 0.5 mm to 1.2 mm (n= 6, µ= 0.9 ± 0.2).

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 7 View FIGURE 7 B). Subsequent chaetae of two sizes (limbate and capillary, Figure 7 View FIGURE 7 C–D). Uncini along entire thorax saw-shaped with 6–7 curved teeth including anterior fang ( Figure 7 View FIGURE 7 E). Tori of similar size throughout.

ABDOMEN: total number of abdominal chaetigers varies from 52 to 59 (n= 2, µ= 55.5 ± 4.9). Uncini sawshaped with 4 to 5 teeth anteriorly ( Figure 7 View FIGURE 7 F), increasing to 6 to 7 in the middle ( Figure 7 View FIGURE 7 G); rasp-shaped posteriorly with 2 to 3 rows of teeth and 7 to 8 teeth (incl. fang) in profile view ( Figure 7 View FIGURE 7 H). Chaetae flat trumpet-shaped ( Figure 7 View FIGURE 7 I). Capillary chaetae not observed. Posterior glandular pad absent.

SIZE: total worm length: 9.6 mm to 19.4 mm (n= 5, µ= 13.2 ± 3.8), thoracic width: 0.9 mm to 1.2 mm (n= 5, µ= 1.1 ± 0.1). Branchiae and operculum accounting for one fourth of entire length.

COLOUR: white.

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 collar capillaries of this species have been described differently: limbate ( Imajima 1976 a), smooth ( Fiege & Sun 1999; this study), or without mentioning whether they are limbate or smooth (Mak 1982; Pillai 2009); this probably is rather a matter of quality of optics and of interpretation than of real differences. The present specimens agree with Imajima’s description. The position of the internal spinules has been reported to be on halfway of each spine ( Pillai 2009), in error, as his figures clearly depict a basal position.

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Serpulidae

Genus

Hydroides

Loc

Hydroides exaltatus ( Marenzeller, 1885 )

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

Hydroides exaltata

Pillai 2009: 115
Sun 2000: 121
Fiege 1999: 116
Hove 1984: 48
Imajima 1976: 127
1976
Loc

Eupomatus exaltatus

Marenzeller 1885: 217
1885