Hesione reticulata von Marenzeller, 1879,

Salazar-Vallejo, Sergio I., 2018, Revision of Hesione Savigny in Lamarck, 1818 (Annelida, Errantia, Hesionidae), Zoosystema 40 (12), pp. 227-325: 300-301

publication ID

http://doi.org/ 10.5252/zoosystema2018v40a12

publication LSID

lsid:zoobank.org:pub:urn:lsid:zoobank.org:pub:6CBF9039-7E4D-4938-909A-2DB5113C8D35

DOI

http://doi.org/10.5281/zenodo.3810221

persistent identifier

http://treatment.plazi.org/id/C17687BD-FF90-FFBD-FC5B-FF7AD993F987

treatment provided by

Felipe

scientific name

Hesione reticulata von Marenzeller, 1879
status

 

Hesione reticulata von Marenzeller, 1879 

( Fig. 47View FIG)

Hesione reticulata von Marenzeller, 1879: 129-131  , pl. 3, fig. 4. — Izuka 1912: 192-194, pl. 2, fig. 7. — Imajima & Hartman 1964: 80. — Jimi et al. 2017: 32-37 View Cited Treatment , figs 1-3.

Hesione pantherina  – Fauvel 1937: 59, 60. — Wu et al. 1975: 75, pl. 2, figs 7, 8 (non Risso, 1826).

Hesione splendida  – Hessle 1925: 13, 15. — Imajima 2003: 132, 134, fig. 78 (non Savigny in Lamarck, 1818).

NON- TYPE MATERIAL. — New Caledonia. 1 specimen, UF 151, Noumea, Île Nou, Anse Kuendo, sand and reef slope, fringing rock, under rocks, 0 -3 m depth, 27.I.1999, G. Paulay coll. 

DISTRIBUTION. — Japan to New Caledonia, in shallow water mixed bottoms.

DIAGNOSIS. — (Modif. after Jimi et al. 2017) Hesione  with rectangular prostomium; parapodia with dorsal cirri basally cylindrical, dorsal cirrophore twice as long as wide; larger acicula blackish; acicular lobe double, tines short, massive, blunt, upper tine slightly longer than lower one; neurochaetal blades bidentate, 3-5 times as long as wide; subdistal tooth smaller; guards approaching distal tooth.

DESCRIPTION

Specimen macerated, UF 151, body wall broken along a posterior right section (removed for molecular analysis); body colorless in ethanol, progressively wider, tapered posteriorly, 52 mm long, 7 mm wide.

Prostomium as wide as long, anterior margin truncate, lateral margins rounded, medially expanded, posterior margin exposed, posterior depression as long as ¼ prostomial length. Antennae not visible. Eyes colorless.

Tentacular cirri macerated, transparent, tips broken, reaching chaetiger 3. Lateral cushions projected, smooth, probably by maceration.

Parapodia with chaetal lobes projected, truncate, twice as long as wide ( Fig. 47B, DView FIG); dorsal cirri with cirrophores too relaxed, four times as long as wide, cirrostyles basally cylindrical, annulated medially and distally, as long as body width (excluding parapodia). Ventral cirri smooth, surpassing chaetal lobe.

Neuraciculae blackish. Acicular lobe double ( Fig. 47B, CView FIG [insets], B, D), tines digitate, upper tine slightly longer than, or up to 1/3 longer than lower tine; in one median parapodium lower tine larger, probably a maceration artifact.

Neurochaetae about 15 per bundle in anterior chaetigers ( Fig. 47CView FIG), about 20 in median chaetigers ( Fig. 47EView FIG), handles honey-colored, blades bidentate, at a certain angle from handle, most eroded or with adsorbed particles, decreasing in size ventrally, 5-8 times as long as wide in anterior chaetigers ( Fig.47DView FIG), 4-5 times in posterior chaetigers ( Fig. 47CView FIG); subdistal teeth smaller, guards, if complete, approaching distal tooth.

Posterior region tapered into a blunt cone; pygidium macerated, relaxed, with 7 blunt papillae.

Pharynx exposed; dorsal papilla rounded, as long as wide. Oocytes not seen.

Pigmentation

Living specimen ( Fig. 47AView FIG) with longitudinal, irregular brownish bands, with oval pale areas in each chaetiger and over central areas of lateral cushions; bands extending towards lateral cushions.Tentacular, dorsal cirri and neuropodial lobes pale. A middorsal reddish line showing the dorsal blood vessel; middorsal lines slightly darker than the others.

REMARKS

Hesione reticulata von Marenzeller, 1879  resembles, as indicated in the key below, H. picta Müller, 1858  . These two species differ in two main features related to their integument and pigmentation. In H. reticulata  integument is rugose because there are transverse and longitudinal striae, and living specimens have a complex, reticulate pigmentation pattern, whereas in H. picta  the dorsum is rather smooth, annulated, but without longitudinal striae, and living specimens have transverse dark brown bands. On the other hand, by their pigmentation pattern, H. reticulata  resembles H. intertexta Grube, 1878  by having longitudinal lines throughout the body, and short antennae. However, because H. reticulata  has an acicular lobe double, it differs from H. intertexta  that has a single acicular lobe. The species has been recently redescribed, a neotype was proposed ( Jimi et al. 2017), and the acicular lobe was confirmed as double. The specimens recorded by Imajima (2003: 132), albeit partially, might belong to this species; in one of his illustrations, a thick acicular lobe can be noted, which can be confused with a single tine, but as shown elsewhere ( Jimi et al. 2017), the shorter tine is difficult to be observed.

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Hesionidae

Genus

Hesione

Loc

Hesione reticulata von Marenzeller, 1879

Salazar-Vallejo, Sergio I. 2018
2018
Loc

Hesione reticulata

JIMI N. & VALLEJO S. I. & KAJIHARA H. 2017: 32
IMAJIMA M. & HARTMAN O. 1964: 80
IZUKA A. 1912: 192
VON MARENZELLER E. 1879: 131
Loc

Hesione pantherina

WU B. & SHEN S. & CHEN M. 1975: 75
FAUVEL P. 1937: 59
Loc

Hesione splendida

IMAJIMA M. 2003: 132
HESSLE C. 1925: 13