Perkinsiana magalhaensis ( Kinberg, 1867 ),

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: 43-47

publication ID

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

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scientific name

Perkinsiana magalhaensis ( Kinberg, 1867 )
status

 

Perkinsiana magalhaensis ( Kinberg, 1867)  , redescription

( Figs 22–24View FIGURE 22View FIGURE 23View FIGURE 24)

Sabella magalhaensis Kinberg, 1867: 353  .— Ehlers 1901: 215.— Kinberg 1910: 72, pl. 27, fig. 7.— Johansson 1925: 22, fig. 7.

Not Bispira magalhaensis  .— Fauvel 1916: 471, pl. 9, figs. 34–43.— Monro 1930: 201.— Hartman 1966: 123, pl. 39, figs 2–6 = Parasabella sensu Knight-Jones & Perkins (1998: 430)  .

Perkinsiana magalhaensis  .— Tovar-Hernández et al. 2012: 61.

Potamethus littoralis Hartman, 1967: 174  –176, pl. 51.

Perkinsiana littoralis  .— Knight-Jones 1983: 288 –289, fig. 20.— Giangrande & Gambi 1997: 268 –270, figs 3–4.

Material examined. CHILE, Beagle Channel, HF 9, Costa Holgar, UANL 8087View Materials, dive 17, sample C 440, 15 m depth, 23 December 2010, coll. D. Bybee, 1 specimen  ; HF9, Islas Gemelos , UANL 8088–8091View Materials: 10–15 m depth, 14–15 December 2010, coll. D. Bybee, 4 specimens  . Seno Ibáñez , UANL 8092–8093View Materials: 3–20 m depth, 19 December 2010, coll. G. Forsterra, 2 specimens  . Isla Martínez, UANL 8094–8095View Materials: 10–16 m depth, 21 December 2010, coll. D. Bybee, 2 specimens  . Isla Dumas, UANL 8096–8097View Materials: 10 m depth, 22 December 2010, coll. D. Bybee, 2 specimens  . Islas Holger , UANL 8098–8103View Materials: 10–14 m depth, 23 December 2010, coll. D. Bybee, 6 specimens  .

Redescription. Trunk length 19–35 mm, width 3–5 mm. Branchial crown length 7–10 mm, with 11–26 pairs of radioles, 4–5 radioles involute mid-ventrally. Six –8 thoracic and 70–94 abdominal segments. Body plump, dorso-ventrally flattened ( Fig. 23View FIGURE 23 G). Radioles with irregular brown bands in pinnules along radiole length, radioles lacking pigmentation. Palmate membrane very low. Radioles with narrow flanges along entire length ( Fig. 23View FIGURE 23 A, F). Longest pinnules at mid-radioles ( Fig. 23View FIGURE 23 B). Radioles with long tips, as long as equivalent space of 8–10 pinnules ( Fig. 23View FIGURE 23 A, B). Dorsal lips 1/4 branchial crown length, with a rigid radiolar appendage and two broad lateral lamellae ( Fig. 23View FIGURE 23 C, D), 2–4 dorsal pinnular appendages. Ventral lips broadly rounded, ear-shaped ( Fig. 23View FIGURE 23 E), two ventral pinnular appendages. Parallel lamellae present ( Fig. 22View FIGURE 22 B, E). Dorsal collar margins not fused to faecal groove ( Fig. 22View FIGURE 22 A, C). Faecal groove wide and depth in thorax ( Fig. 22View FIGURE 22 A, C). Anterior peristomial ring margin exposed dorsally ( Fig. 22View FIGURE 22 A, C). Ventral lappets of collar distally rounded, overlapping ( Fig. 22View FIGURE 22 B, D). Lateral collar margins oblique, higher ventrally, covering junction of anterior peristomial ring and radioles ( Fig. 22View FIGURE 22 F). Ventral shield of chaetiger 1 divided transversely, anterior part slightly narrower and shorter than posterior ( Fig. 22View FIGURE 22 B, D). Sometimes shield is also divided mid-ventrally, forming four square areas ( Fig. 22View FIGURE 22 B). Chaetiger 1 with elongate narrowly hooded notochaetae. Thoracic ventral shields rectangular ( Fig. 22View FIGURE 22 B, C). Thoracic neuropodial tori of equal length, contacting ventral shields ( Fig. 22View FIGURE 22 B, C, F). Superior thoracic notochaetae narrowly hooded, hood one-quarter width of shaft ( Fig. 24View FIGURE 24 B). Inferior thoracic notochaetae paleate with hoods same width as shafts ( Fig. 24View FIGURE 24 A). Thoracic uncini with 9–10 rows of teeth of equal size above main fang, occupying one half main fang length, hood absent, breast well developed, handles as long as three times the length of main fang. Companion chaetae with symmetrical, teardrop-shaped membranes ( Fig. 24View FIGURE 24 C). Abdominal neurochaetae Type C (elongate with narrow hoods, hood one-quarter width of shaft, slightly curved at base of hooded area) ( Fig. 24View FIGURE 24 F). Abdominal uncini with dentition similar to those in thorax, 8–10 rows of teeth and handles short, as long as main fang ( Fig. 24View FIGURE 24 D). Pygidium bilobed, with two groups of small dorsolateral pygidial eyes located dorsally, unequal in size only in larger specimens ( Fig. 24View FIGURE 24 E). Anus ventral. Tubes amber.

Type locality. Bucket Island ( Isla Sánchez), Bahía San Nicolás, Strait of Magellan ( Chile). 

Remarks. Kinberg (1867: 353) described this species as Sabella magalhaensis  . Ehlers (1901: 215) only listed S. magalhaensis  , indicating its type locality, without any new records or remarks accompanying the species name. Illustrations of chaetae, radioles, ventrum and chaetigers were provided by Kinberg (1910: 72, pl. 27, fig. 7). Fauvel (1916: 471, pl. 9, figs 34–43) transferred S. magalhaensis  to Bispira Krøyer, 1856  and recorded it from Roy Cove ( Falkland Islands). Johansson (1925: 22, fig. 7), in his revision of sabellariid and sabellid species described by Kinberg, mentioned that the type of S. magalhaensis  was broken into four pieces (branchial crown, two pieces of thorax, and two pieces of the abdomen, nearly to 100 segments) and provided a new illustration for a thoracic paleate chaeta (not broadly-hooded as Kinberg illustrated). Monro (1930: 201) recorded Bispira magalhaensis  from East Falkland Island and Hartman (1966: 123, pl. 39, figs 2–6) recorded it from Antarctica  but provided an illustration re-drawn from Fauvel (1916). Knight-Jones & Perkins (1998) examined the type (Naturiska Rikmusset Stockholm, 1086) of S. magalhaensis  and transferred it to Perkinsiana  but they did not provide a description or illustrations to accompany this new combination, perhaps due to the bad condition of the type. They also examined Fauvel’s material of “ Bispira  magalhaensis  ( MNHN A412) and found it to be Parasabella leucaspis ( Kinberg, 1867)  (as Demonax Kinberg, 1867  ). But as indicated in remarks for the genus Parasabella  , all records of D. leucaspis  require exhaustive revision and must be used with caution because more than one species are involved.

Hartman (1967) described Potamethus littoralis  from the South Shetlands Island at a depth of 79 m and provided illustrations for chaetae. Later, Knight-Jones (1983) re-examined the holotype of P. littoralis  , transferred it to Perkinsiana  and provided illustrations of the branchial crown, thorax and chaetae. Giangrande & Gambi (1997) also examined the holotype, providing a description that agreed to that of Knight-Jones (1983). Tovar- Hernández et al. (2012) suggested that P. magalhaensis  and P. littoralis  should be considered as synonyms.

Perkinsiana magalhaensis  and P. littoralis  share the presence of overlapping ventral lappets, anterior peristomial ring exposed only dorsally, abdominal chaetae narrowly-hooded (type C), radiolar tips long, narrow flanges, dorsal lips with a rigid, radiolar appendage, with two broad lateral lamellae, and both species were described from the Antarctic region, Magellan Strait and South Shetland Islands, respectively. The name P. magalhaensis  has priority over P. littoralis  . For comparisons of P. magalhaensis  with other Magellanic Perkinsiana  species, see remarks on P. antarctica  and P. assimilis  .

UANL

Universidad Autonoma de Nuevo Leon

MNHN

Museum National d'Histoire Naturelle

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Sabellida

Family

Sabellidae

Genus

Perkinsiana

Loc

Perkinsiana magalhaensis ( Kinberg, 1867 )

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

Perkinsiana magalhaensis

Tovar-Hernandez 2012: 61
2012
Loc

Perkinsiana littoralis

Giangrande 1997: 268
Knight-Jones 1983: 288
1983
Loc

Potamethus littoralis

Hartman 1967: 174
1967
Loc

Bispira magalhaensis

Knight-Jones 1998: 430
Hartman 1966: 123
Monro 1930: 201
Fauvel 1916: 471
1916
Loc

Sabella magalhaensis

Johansson 1925: 22
Kinberg 1910: 72
Ehlers 1901: 215
Kinberg 1867: 353
1867