Notaulax tilosaula ( Schmarda, 1861 )

Tovar-Hernández, María Ana, León-González, Jesús Ángel De & Bybee, David R., 2017, Sabellid worms from the Patagonian Shelf and Humboldt Current System (Annelida, Sabellidae): Phyllis Knight-Jones’ and José María Orensanz’s collections, Zootaxa 4283 (1), pp. 1-64: 21-24

publication ID

http://doi.org/ 10.5281/zenodo.828032

publication LSID

lsid:zoobank.org:pub:E62F2AD9-112F-40F0-B8E4-6FF79D27C8B2

persistent identifier

http://treatment.plazi.org/id/EE3E87C6-FFBF-A35B-FF7F-DAFAFCC858BB

treatment provided by

Plazi

scientific name

Notaulax tilosaula ( Schmarda, 1861 )
status

new combination

Notaulax tilosaula ( Schmarda, 1861)   , new combination

( Figs 9 View FIGURE 9 , 10 View FIGURE 10 , 32 View FIGURE 32 B)

Sabella tilosaula Schmarda, 1861: 34   , pl. 23, fig. 191, text fig. a –d.— Ehlers 1901: 216.— Perkins 1984: 328.

Material examined. CHILE, ( UANL 8057, 8058), Puerto de Valparaíso   , Chile, 33°02’09.76’’S, 71°37’37.30’’W, dock fouling, 13 m depth, 19 April 2005, coll. E. Schwindt & L. Prado, 2 specimens GoogleMaps   . PERU, UANL 8059 View Materials , Callao, Crab trap, 25 August 1977, 1 specimen. Sabella phaeotaenia Schmarda, 1861   , syntype   , NHMW 1902, only trunk, branchial crown not preserved. Sabella tilosaula Schmarda, 1861   , NHMW 1733, labelled as type but instead a member of Terebellidae   .

Redescription (based on specimens from Valparaíso). Trunk length 7.6 – 8 cm, width 3 – 4 mm. Branchial crown length 15 – 18 mm, with 18 pairs if radioles. Eight to 15 thoracic chaetigers, number of abdominal segments not determined (posterior abdomen inside tubes). Branchial lobes joined mid-dorsally. Basal lamina as long as length of collar segment in lateral view ( Fig. 9 View FIGURE 9 B). Base of branchial crown with flanges; dorsal ones prominent ( Fig. 9 View FIGURE 9 A, D), triangular in side view ( Fig. 9 View FIGURE 9 B), ventral flanges reduced. Radioles arranged in two semicircles, not involuted mid-ventrally and joined by palmate membrane extending 1/4 length of branchial crown. Outer margins of radioles flat, with broad flanges extending only from distal-most eyes to radiolar tips. Radiolar tips short, occupying space of three pinnules width ( Fig. 10 View FIGURE 10 D). Two rows of 30 – 38 lensed eyes, beginning above palmate membrane and extending 1/2 branchial crown length, present on all radioles ( Fig. 9 View FIGURE 9 E, F). Dorsal lips long, extending to end of palmate membrane, triangular with radiolar appendage. Ventral lips short, rounded lobes. Ventral radiolar appendages and dorsal radiolar appendages all absent. Parallel lamellae and ventral sacs present, between branchial lobes. Dorsal margins of collar diagonal, fused to faecal groove ( Fig. 9 View FIGURE 9 A, D). Lateral collar margins oblique (or V-shaped) ( Fig. 9 View FIGURE 9 B). Ventral collar lappets triangular, distal margins rounded with short incision, not longer than 1/4 ventral length of collar ( Fig. 9 View FIGURE 9 C); below incision, a pair of small diagonal lines of cilia is present. Ventral shield of chaetiger 1 divided transversely in two rectangular glandular areas with diagonal lateral margins, anterior glandular area narrower than posterior ( Fig. 9 View FIGURE 9 C). Subsequent ventral shields entire, nearly trapezoidal, laterally indented by neuropodial tori ( Fig. 9 View FIGURE 9 C). Chaetiger 1 with pair of long, slightly oblique longitudinal row of more than 45 spine-like notochaetae. Remaining thoracic notopodia with superior broadly hooded chaetae ( Fig. 10 View FIGURE 10 E), inferior paleate, without mucros ( Fig. 10 View FIGURE 10 E, F). Neurochaeta avicular uncini, with medium-sized handles, developed breast and several rows of minute, similar-size teeth above main fang; neuropodial companion chaetae with rounded denticulate head and long, gently tapering asymmetrical membrane ( Fig. 10 View FIGURE 10 G). Abdominal segments with interramal eyespots ( Fig. 10 View FIGURE 10 C). Avicular abdominal uncini similar to thoracic; neuropodial tori with five abdominal paleate neurochaetae with long mucros ( Fig. 10 View FIGURE 10 H) and 5 needle-like chaetae, posterior to paleae, two times longer than paleae. Pygidial eyespots not observed. Tubes fibrous, with rough outer surfaces ( Fig. 10 View FIGURE 10 A, B), 10 – 13 cm long, 3 mm wide in distal portion, narrower towards basal region. Tube walls composed of several layers, externally brown, internally olive-green. One specimen male ( UANL 8057) with a dense spermatic mass in the abdomen, as well as patches of sperm attached to the interior sides of the tube, spermatozoa have rounded heads and long flagella. The additional specimen fromValparaíso ( UANL 8058) is a female with an abdomen full of oocytes.

Type locality. Chile (no more information provided by Schmarda 1861).

Remarks. Notaulax tilosaula   was described from the Chilean coast and illustrated by Schmarda (1861: pl. 23, fig. 191, text fig. a –d). The specimen reported by Kinberg (1867: 354) as Demonax tilosaulus   (not Sabella tilosaula Schmarda, 1861   ) is a Chone   species according to Hartman (1959: 514). Hartman (1959: 565) stated that N. tilosaula   is possibly Sabella phaeotaenia Schmarda   (currently recognized in Notaulax   ), a species described from Ceylon, but Perkins (1984) recognized them as different valid species, as is shown herein. In 2010, one of us (MAT-H) examined one specimen labeled as the type of Sabella tilosaula Schmarda   ( NHMW 1733), which was determined to be a member of the Terebellidae   . The specimens reviewed here fits completely the original description and illustrations by Schmarda for N. tilosaula   , and it has a set of unique features that allow a clear separation from N. phaeotaenia   .

The syntype of Notaulax phaeotaenia   revised in this study ( NHMW 1902) has a very long basal lamina (as long as the thorax) and the ventral margins are entire, very shallow, angle almost horizontal, while in N. tilosaula   the basal lamina is short (as long as the collar segment) and the ventral margins are incised, long, projected. The lateral collar margin in N. phaeotaenia   is even (V-shaped in N. tilosaula   ). Live color of both species are different: N. phaeotaenia   has a red branchial crown with alternating yellow bands, while in N. tilosaula   the crown is entirely red. Although chaetae and uncini of both species were not compared, the differences stated above are sufficient to consider both species separately.

There are some records of N. phaeotaenia   in South America, particularly from Patagonia ( Hartmann-Schröder 1983; Montiel et al. 2004, 2011; Rios et al. 2005), but these might be erroneous since the type locality (Ceylon, current Sri Lanka) has environmental conditions completely different from those in Patagonia and specimens have never been properly compared. A reexamination of these specimens is recommended.

The presence of interramal eyespots ( Fig. 10 View FIGURE 10 C) has never been described among members of Notaulax   . In the current study, these structures are reported for N. tilosaula   .

UANL

Universidad Autonoma de Nuevo Leon

NHMW

Naturhistorisches Museum, Wien

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Sabellidae

Genus

Notaulax

Loc

Notaulax tilosaula ( Schmarda, 1861 )

Tovar-Hernández, María Ana, León-González, Jesús Ángel De & Bybee, David R. 2017
2017
Loc

Sabella tilosaula

Perkins 1984: 328
Ehlers 1901: 216
Schmarda 1861: 34
1861