Harmothoe benthaliana McIntosh, 1885

Barnich, Ruth & Fiege, Dieter, 2009, Revision of the genus Harmothoe Kinberg, 1856 (Polychaeta: Polynoidae) in the Northeast Atlantic, Zootaxa 2104 (1), pp. 1-76 : 26-28

publication ID

https://doi.org/ 10.11646/zootaxa.2104.1.1

persistent identifier

https://treatment.plazi.org/id/03A61979-C23A-FFC2-FF18-F9E2FD7013A6

treatment provided by

Felipe

scientific name

Harmothoe benthaliana McIntosh, 1885
status

 

Harmothoe benthaliana McIntosh, 1885 View in CoL

( Figs. 4 View FIGURE 4 ; 12A–E View FIGURE 12 )

Harmothoe benthaliana McIntosh, 1885: 95 View in CoL , pl. 13 fig. 3, pl. 20 fig. 7, pl. 10A figs. 9–10.

Harmothoe joubini Fauvel, 1913: 15 View in CoL , fig. 5; Fauvel (1914a): 54, pl. 3 figs. 6–12 [new synonymy].

Harmothoe joubini rosaurae Monro, 1939: 350 View in CoL , textfig. 281 [new synonymy].

Type material. Harmothoe benthaliana : 2 syntypes, BMNH 1885.12 .1.75, "Challenger" St. 45, off the American coast, 38°34'N 72°10'W, 3 May 1873, dredged, 1240 fms, blue mud GoogleMaps .

Harmothoe joubini : 2 syntypes, IEA I/30 (slides with fragments), Campagne scientifique d’Albert Ier 1902, St. 1269, 60 miles SSE off Cape Saint Vincent, Portugal, 1473 m, mud .

Harmothoe joubini rosaurae : 4 syntypes (2 cs, 2 af), BMNH 1941.1.1.16–19, "Rosaura" St. 49, between Fuerteventura and Africa, 28°25’N 13°34’W, Agassiz trawl, 1300 m GoogleMaps .

Diagnosis. Anterior pair of eyes dorsolateral at widest part of prostomium. Elytral margin smooth; conical microtubercles in a patch near anterior margin. Noto- and neurochaetae with faint rows of spines; tip of neurochaetae distinctly falcate. Neuropodial supra-acicular process thick, stout.

Description (based on syntypes of H. benthaliana (juveniles), except for number of elytra and segments, cf. Fauvel 1913).

Body with up to 39 segments. At anterior end ( Fig. 12A View FIGURE 12 ), prostomium bilobed, with blunt cephalic peaks; ceratophore of median antenna in anterior notch, lateral antennae inserted ventrally, styles of antennae papillate, tapering; anterior pair of eyes situated dorsolaterally at widest part of prostomium, posterior pair dorsally near hind margin of prostomium; palps papillate, tapering.

Tentaculophores inserted laterally to prostomium, each with a dorsal and ventral tentacular cirrus, styles of cirri papillate, tapering (notochaetae indistinct). Second segment with first pair of elytra, biramous parapodia, and long buccal cirri. Following segments with tapering, short ventral cirri.

Fifteen pairs of elytra, covering dorsum, on segments 2, 4, 5, 7, then on every second segment to 23, 26, 29, 32; last seven segments cirrigerous; elytral margin smooth; conical microtubercles present in a patch near anterior margin ( Fig. 12B View FIGURE 12 ). Cirrigerous segments with distinct dorsal tubercles; dorsal cirri with cylindrical cirrophore, style papillate, tapering.

Parapodia biramous; notopodia with elongate acicular lobe; neuropodia with elongate prechaetal acicular lobe with thick, stout supra-acicular process; neuropodial postchaetal lobe shorter than prechaetal lobe, rounded; tips of noto- and neuroacicula penetrating epidermis ( Fig. 12C View FIGURE 12 ). Noto- and neurochaetae with faint rows of spines; tip of notochaetae blunt; tip of neurochaetae distinctly falcate, mainly bidentate with small secondary tooth (often abraded) ( Fig 12D,E View FIGURE 12 ).

Measurements. Syntypes of H. benthaliana, BMNH 1885.12.1.75: 1 cs, juvenile, cut in two, L 6 mm, W 2.5 mm for 28 segments; 1 af ( Fig. 12A View FIGURE 12 ), juvenile, L 5 mm, W 2.5 mm for 24 segments. Large syntype of H. joubini rosaurae, BMNH 1941.1.1.16–19: cs, L 17 mm, W 6 mm for 37 segments.

Remarks. Although the description of Harmothoe benthaliana is based on juveniles, the diagnostic characters can also be observed in adult specimens, like those of H. joubini rosaurae .

Harmothoe benthaliana View in CoL and H. longisetis ( Grube, 1863) View in CoL have similar elytra, but they differ mainly due to their chaetae; i.e. faint rows of spines and tip of neurochaetae distinctly hooked in H. benthaliana View in CoL and distinct rows of spines and tip of neurochaetae straight to slightly bent in H. longisetis View in CoL . Moreover the neuropodial supra-acicular process is slender digitiform in the latter and thick, stout in the former.

Distribution. Deep North Atlantic.

Habitat. Muddy sediments, in 1300–2275 m.

IEA

Instituto DI Entomologia Agraria

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Polynoidae

Genus

Harmothoe

Loc

Harmothoe benthaliana McIntosh, 1885

Barnich, Ruth & Fiege, Dieter 2009
2009
Loc

Harmothoe joubini rosaurae

Monro, C. C. A. 1939: 350
1939
Loc

Harmothoe joubini

Fauvel, P. 1914: 54
Fauvel, P. 1913: 15
1913
Loc

Harmothoe benthaliana

McIntosh, W. C. 1885: 95
1885
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