Trophoniella minuta, SALAzAR-Vallejo, 2012

SALAzAR-Vallejo, Sergio I., 2012, Revision of Trophoniella Hartman, 1959 (Polychaeta, Flabelligeridae), Zoosystema 34 (3), pp. 453-519: 453-519

publication ID

http://doi.org/ 10.5252/z2012n3a1

persistent identifier

http://treatment.plazi.org/id/03F987D8-FFB0-AE2D-D151-03B3FECCFD95

treatment provided by

Felipe

scientific name

Trophoniella minuta
status

 

Trophoniella minuta  

(Blanchard in Gay, 1849) n. comb. ( Fig. 21 View FIG )

Siphostoma minutum Blanchard   in Gay, 1849: 36. — Rozbaczylo 1985: 161.

Pherusa minuta   – Quatrefages 1866: 480.

Pherusa heteropapillata Hartmann-Schröder, 1965: 227   , figs 222, 223. — Rozbaczylo 1985: 160.

TYPE MATERIAL. — Southeastern Pacific Ocean. Holotype of S. minutum   ( MNHN 628), Chile (specific locality not stated, probably Valparaiso), 1834, Fontaine (complete, some parapodia removed, body wall with a transverse anterior fracture; 14 mm long, 3 mm wide, cephalic cage 4 mm long, 59 chaetigers; first anchylosed neurohooks in chaetiger 6). — Paratypes of P. heteropapillata   ( ZMH unnumb.), off Puerto Estero Cisne, Isla James, Los Chones Archipelago, Chile, mussel-bed, shallow water, 11.VII.1958, Stuardo (4 complete 40-43 mm long, 5.0- 10.5 mm wide, cephalic cage 10.0- 10.5 mm long, 82-84 chaetigers; all with anchylosed neurohooks from chaetiger 6; description based on the best paratype).

ADDITIONAL MATERIAL. — Southeastern Pacific Ocean. 1 specimen ( MCZ 55674 View Materials ), Paraca Bay, Peru, no further data (108 mm long, 11 mm wide, cephalic cage 10.5 mm long, 87 chaetigers). — 1 specimen ( MCZ 55675 View Materials ), Valparaiso, Chile, no further data (70 mm long, 10 mm wide, cephalic cage 9 mm long, 78 chaetigers). — 1 specimen ( LACM-AHF 2498), most chaetae undamaged, R/ V Velero III, stn 376 (14°15’35”S, 76°11’35”W), E of Viejas (or Independencia) Island, Independencia Bay , Peru, 7 fathoms, rock, 13.I.1935 (15 mm long, 4 mm wide, cephalic cage 6 mm long, 60 chaetigers; gonopodial lobes visible once the tunic is removed, low rounded lobes on the anteroventral surface of chaetiger 5) GoogleMaps   .

DISTRIBUTION. — From Peru to Chile, in shallow water along rocky or mixed bottoms.

DESCRIPTION

Holotype ( MNHN 628 View Materials )pale,soft,preserved in alcohol ( Fig.21A View FIG )   . Paratypes of Pherusa heteropapillata   (ZMH unnumb.) large, dark, stiff ( Fig.21D View FIG ).Body fusiform, wider anteriorly, tapering posteriorly, 43 mm long, 9 mm wide, cephalic cage 10 mm long, 84 chaetigers. Tunic sparsely papillated, without sediment particles ( Fig. 21B, C View FIG ), surface wooly with fine to very fine sediment particles ( Fig. 21E View FIG ). Body papillae thin, globose, most not exposed,few larger papillae arranged in longitudinal rows, two dorsal, four ventral, distally exposed (more clearly seen in holotype).

Cephalic hood not exposed; anterior end observed by dissection of one paratype; cephalic hood short, dark, margin apparently smooth.Prostomium blackish, low; eyes large, black. Caruncle well developed, reaching the margin of branchial lobe; median keel rounded, grayish, tapering posteriorly, becoming flat by the middle of branchial lobe; marginal ridges flat, darker than median keel. Palps reduced, very short, the left one longest, about ¼ as long as branchial lobe, smooth; palp keels reduced, low, rounded.Lips fused in an oral tube (details incomplete because it was damaged by dissection). Branchiae cirriform, maculated, on a tongue-like protuberance, separated in two lateral groups, arranged in rows; each group with about 200 filaments, basal branchiae longest, decreasing in size towards the margin. Nephridial lobes short, filiform, basally darker, placed in the inner basal margin of branchial groups, not clearly separated from them.

Cephalic cage chaetae about ¼ as long as body length, or as long as body width. Chaetigers 1-3 involved in the cephalic cage; chaetae arranged in short dorsolateral series in chaetigers 1-2, lateral in chaetiger 3; chaetiger 1 with 12 noto- and six neurochaetae; chaetiger 2 with six chaetae per bundle, chaetiger 3 with 6-7 chaetae per bundle. Anterior dorsal margin of first chaetiger much contracted, not visible dorsally or ventrally. Anterior chaetigers without long papillae. Chaetigers 1-3 of about the same length. Chaetal transition from cephalic cage to body chaetae abrupt; falcate, anchylosed neurohooks present from chaetiger 6. Gonopodial lobes not seen ( MCZ 55674 View Materials with black tiny papillae in chaetiger 5; only seen after removing the tunic).

Parapodia poorly developed, chaetae emerging from the body wall ( Fig. 21E View FIG ). Parapodia lateral; median neuropodia ventrolateral. Noto- and neuropodia low, with two larger papillae per bundle, one suprachaetal, the other infrachaetal. Noto- and neuropodia distant to each other.

Median notochaetae arranged in transverse series; 11-12 per bundle, as long as ¼ body width; all notochaetae multiarticulated capillaries, each with articles short along the chaeta ( Fig. 21F View FIG ). Neurochaetae multiarticulated capillaries in chaetigers 1-5, becoming shorter in chaetigers 4-5;falcate anchylosed neurohooks from chaetiger 6, dark brown, arranged in J-patterns, 5-6 per bundle, each with short rings present to the median region, subdistally tapering, with oblique striae, surface rough, tip entire ( Fig. 21G View FIG ).

Posterior end blunt, pygidium with anus terminal, without anal cirri.

REMARKS Trophoniella minuta   n. comb. resembles other species lacking sediment on the tunic and having digitate or slighlty capitate body papillae, like T. jareckiorum   n. sp. from the Caribbean Sea and T. salazarae   n. sp. from the Mexican Pacific coast. However, T. minuta   n. comb. differs because it has about 10 notochaetae per bundle and has an often smooth and transparent tunic, at least along the anterior region, whereas the two other species have fewer notochaetae and their tunics are papillated and opaque, either whitish as in T. jareckiorum   n. sp., or grayish to reddish as in T. salazarae   n. sp. The reduction of palp size is noteworthy; they could be in regeneration, but it is very rare that both palps had been lost almost at the same time, because they have slightly different size.See T. grandis   n. comb. for other remarks on the use of the names originally applied by Blanchard and later modified by Quatrefages.

MNHN

Museum National d'Histoire Naturelle

ZMH

Zoologisches Museum Hamburg

MCZ

Museum of Comparative Zoology

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Terebellida

Family

Flabelligeridae

Genus

Trophoniella

Loc

Trophoniella minuta

SALAzAR-Vallejo, Sergio I. 2012
2012
Loc

Pherusa heteropapillata Hartmann-Schröder, 1965: 227

ROZBACZYLO N. 1985: 160
1985
Loc

Pherusa minuta

QUATREFAGES A. & DE 1866: 480
1866
Loc

Siphostoma minutum

ROZBACZYLO N. 1985: 161
GAY C. 1849: 36
1849