Torquella longisetosa ( Kudinova-Pasternak, 1990 ) Błażewicz-Paszkowycz, 2007

Błażewicz-Paszkowycz, Magdalena, 2007, Figure 6. Typhlotanais Compactus, Female A In Family Nototanaidae Sieg, 1976 And Typhlotanaidae Sieg, 1984, Zootaxa 1598, pp. 1-141 : 73-78

Torquella longisetosa ( Kudinova-Pasternak, 1990) n. comb.

( Fig. 39–42 )

Typhlotanais longisetosus: Kudinova-Pasternak (1990 a) 126: 96–97; Kudinova-Pasternak (1993) 127: 141; Larsen (2005): 210.

Material examined: Holotype: female (Mh 10), Akademik Kurchatov Sta. 4923, 25°17’S, 12°24’E, depth 3175m; one female, three mancae, ( K 41411 ), ANT XXII/3 , PS 67/81-8-E, 70°32.02'–70°30.3l'S, 14°35.05– 14°35.13'W, depth 4392– 4385 m, epibenthic sledge, 24 Feb 2005; ( K 41412 ), ANT XXII/2 , PS 67/43-8, 60°27.12'– 60°27.24' S, 56°05.10'– 56°05.25'W, depth 3961.0– 3962.4 m, epibenthic sledge, 4 Feb 2002.

Diagnosis: Carapace 1.2 times as long as wide; pereonite-2 1.6 times as long as pereonite-1; pereonites 2 and 3 subequal; pereonite-5 longest, 1.3 times as long as wide; chela about four times as long as wide; anten- nule article-3 less than three times as long as article-2; pereopod-1 merus and carpus more than half of basis length, merus with spiniform and simple seta, propodus two short and one long rod setae dorsally; pereopod-2 propodus with two setae dorsally (one short and one reaching over unguis), merus with spine and simple seta (half length of carpus), carpus with three spiniform setae and two simple setae reaching half length of propodus; pereopods 4 and 5 propodus distal seta barely reaching half length of dactylus; pereopods 4–6 with few spines around prickly tubercles; pereopod-6 propodus distal setae subequal; uropod rami two-articled; exopod reaching to about half length of endopod distal article.

Description: Ovigerous female. Body length 2.9 mm ( Fig. 40 ), 7.5 times as long as wide. Carapace smooth, 15% of body length, a little longer than wide, slightly narrowing rostrally, rounded laterally, rostrum acute. Pereonite-1 three times as wide as long, latero-proximal corners expanded forward; pereonite-2 and 3 subequal, both about 1.3 times as long as wide; pereonite-4 as long as wide; pereonite-5 longest, as long as carapace; pereonite-6 rhomboidal. Pleon 15% of body length, pleonites 1–5 similar in size; pleotelson rectangular.

Antennule ( Fig. 41A ): Article-1 stout, three times as long as wide, with three setae along article; article-2 with one seta distally; article-3 three times as long as article-2.

Antenna ( Fig. 41B ): Article-2 twice as long as article-3, with one seta; article-3 naked; article-4 is 2.4 times as long as article-5, with three simple and one pinnate setae distally; article-5 with one simple seta distally; article-6 very short, with five terminal setae.

Mouth parts: Labrum ( Fig. 41C ) hood-shaped, covered by numerous minute setae. Mandible ( Fig. 41D,E ) stout; molar process well-developed, with crenulated edges; lacinia mobilis well-developed, crenulated. Maxillule ( Fig. 41F ) endite with eight apical spiniform setae; palp ( Fig. 41 F’) with two setae. Maxilla ( Fig. 41G ) semi-oval, naked. Maxilliped ( Fig. 41H ) bases fused about as wide as long, with two simple setae reaching end of endites; endite armed with pinnate seta and two tubercles on distal margin; palp four-articled: article-1 naked, article-2 wedge-shaped with one bipinnate seta and two simple setae on inner margin, article-3 with three serrated setae and one simple seta on inner margin, article-4 slender (twice as long as wide) with one simple seta on outer margin and five terminal setae. Labium ( Fig. 41I ) bilobed, outer corner of inner lobe and outer lobe with minute setae.

Cheliped ( Fig. 42A ) slender. Basis twice as long as wide; merus wedge-shaped with one seta ventrally; carpus about three times as long as broad, with two dorsal setae and with two long and one short ventral setae; propodus and fixed finger little longer than carpus, about four times as long as broad; dactylus little longer than whole; fixed finger with well-calcified inner margin, only one seta visible, ventral margin with two simple setae.

Pereopod-1 ( Fig. 42B ): Of walking type; coxa present; basis 1.4 times as long as merus and carpus combined, with two small setae on ventral margin and two simple setae and one pinnate seta on dorsal margin; ischium short with one seta; merus almost as long as carpus, with one rod and one simple setae distally; carpus with three simple and three rod setae distally; propodus 1.3 times as long as carpus with one setae ventrally and two (short and long) rod setae dorsally; dactylus and unguis combined almost as long as propodus, dactylus 0.6 times as long as unguis.

Pereopod-2 ( Fig. 42C ): Of walking type; coxa present; basis with one simple and one pinnate seta proximally, longer than ischium, merus and carpus combined; ischium with one seta; merus almost as long as carpus, with one simple and one spiniform setae distally, some microtrichae on ventral margin; carpus with three spiniform, and two simple setae distally; propodus 1.3 times as long as carpus with spiniform seta ventrally and with long simple and spiniform setae dorsally; dactylus and unguis combined 0.6 times length of propodus, dactylus almost as long as unguis.

Pereopod-3 ( Fig. 42D ): Similar to pereopod-2, but microtrichae on ventral margin well-calcified.

Pereopod-4 ( Fig. 42E ): Clinging type; coxa absent; basis with one seta ventrally; ischium with two setae ventrally; merus with two spiniform setae distally; carpus with two spiniform setae distally and with prickly tubercles surrounded by rare spines; propodus six times as long as wide, with pinnate seta mid-dorsally, two spiniform ventro-distal setae and one distal seta just reaching half of dactylus; unguis simple, with spines ventrally.

Pereopod-5 missing from specimen.

Pereopod-6 ( Fig. 42F ): Similar to pereopod-4, but propodus with three distal setae a little longer than half of dactylus.

Pleopods 1–5 damaged.

Uropod ( Fig. 42G ): Endopod with two articles, proximal and distal article subequal; proximal with two pinnate setae distally; distal article with five terminal setae. Exopod with two articles; distal article 1.6 times as long as proximal, tipped by long simple seta.

Distribution: South-eastern Atlantic (25°17’S, 12°24’E), Eastern Weddell Sea, south of Falkland Islands, depth range 3060–6100 m.

Remarks: The holotype provided by Kudinova-Pasternak lacks a carapace and most appendages, the remains of which are shown in figure 39. The finding of T. longisetosa in ANDEEP samples allows the drawing of its morphological details and redescription. It can be immediately distinguished from its congeners by the long seta on the propodus of pereopods 2 and 3.

Figures

FIGURE 39. Torquella (=Typhlotanais) longisetosa. A) Holotype, female, dorsal view. B) Uropod. Scale: A = 1 mm; B = 0.1 mm.

FIGURE 40. Torquella longisetosa female (ANDEEP material). A) lateral view; B) dorsal view. Scale = 1 mm.

FIGURE 41. Torquella longisetosa (ANDEEP material). A) Antennule; B) Antenna; C) Labrum; D) Left mandible; E) Right mandible; F) Maxillule; F’) Palp; G) Maxilla; H) Maxilliped; I) Labium. Scale: A, B, I = 0.1 mm; C-H = 0.01 mm.

FIGURE 42. Torquella (=Typhlotanais) longisetosa (ANDEEP material). A) Cheliped; B) Pereopod-1; C) Pereopod-2; D) Pereopod-3; E) Pereopod-4; F) Pereopod-5; G) Uropod. Scale = 0.1 mm.