Torquella eltaninae, 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 : 80-83

Torquella eltaninae n. sp.

( Figs 44–45 )

Diagnosis: Carapace 1.3 times as long as wide. Pereonite-2 about 1.3 times as long as pereonite-1; pereonites 3 and 5 about as long as wide. Chela 2.5 times as long as wide. Antennule article-3 1.6 times as long as article- 2. Pereopod-1 merus with short seta; pereopod-2 propodus with one simple seta reaching half of unguis, merus with one spiniform seta, carpus with spiniform setae ventrally and two short simple seta dorsally; pereopods 4 and 5 propodus distal seta reaching end of dactylus; pereopods 4–6 with numerous spines around prickly tubercles; pereopod-6 propodus with one long and two short setae distally. Uropod endopod twice as long as basal article; uropod exopod about half of endopod proximal article.

Material examined: Holotype: one female, ( K 41454 ), ANT XXII/3 , PS67/078-9, 71°09.39'– 71°09.36'S, 13°59.30'– 13°58.81'W, depth 2156– 2147 m, epibenthic sledge, 21 Feb 2005 ; Paratypes: one female, ( USNM 1100142 ), Eltanin 9, Sta.724, 54°05'– 54°04'S, 033°43'– 033°37'W, depth 2714–2727 m, 9 Sep 1963 ; two females (one damaged), ( USNM 100141 ) Eltanin 4, Sta.127, 61°45’S – 61°14’W, depth 4758 m, 1 Aug 1962 .

Etymology: The name is given after the research vessel Eltanin from which the species was collected.

Description: Female. Body length 2.3 mm ( Figs 44A,B ), 7.2 times as long as wide. Carapace smooth, 20% of body length, 1.3 times as long as wide, slightly narrowing rostrally, rounded laterally, rostrum acute. Pereonite-1 twice as wide as long, antero-lateral corners expanded forward; pereonite-2 is 1.2 times as wide as long; pereonites 4 and 5 subequal, a little wider than long; pereonite-6 twice as wide as long. Pleon 18% of body length, pleonites 1–5 similar in size; pleotelson rectangular.

Antennule ( Fig. 44D ): Article-1 stout, over twice as long as wide, with few pinnate setae distally; article- 2 with two setae distally; article-3 1.6 times as long as article-2, with six setae distally.

Antenna ( Fig. 44E ): Article-2 twice as long as article-3, with one seta; article-3 naked; article-4 is 2.6 times as long as article-5, with two simple and five pinnate setae distally; article-5 with one simple seta distally; article-6 very short, with five terminal setae.

Mouth parts: Labrum lost during dissection. Mandible ( Fig. 44F,G ) stout; molar process ( Fig. 44 G’) welldeveloped, edges supported with tubercle-like structures, lower edge with spines; lacinia mobilis well-developed, crenulated. Maxillule ( Fig. 44H ) inner endite with eight apical spiniform setae; palp with two distal setae. Maxilla lost during dissection. Maxilliped ( Fig. 45A ): bases fused, bilobed with simple setae reaching half of endites; endite armed with seta in dorso-lateral corner and two tubercles on distal margin; palp fourarticled: article-1 naked; article-2 wedge-shaped, with three setae on inner margin and one short seta on outer margin; article-3 with three biserrated setae, one simple setae on inner margin; article-4 with one bipinnate seta on outer margin and five terminal setae.

Cheliped ( Fig. 45B ): Basis 1.5 times as long as wide, with one seta; merus wedge-shaped with one seta ventrally; carpus over twice as long as broad, with two dorsal setae and with two long setae ventrally; propodus and fixed finger 1.2 times as long as carpus, about three times as long as wide, with one setae near insertion of dactylus; fixed finger with three setae on inner margin and with two setae on ventral margin.

Pereopod-1 ( Fig. 45C ): Of walking type; coxa present: basis longer than merus and carpus combined, with one simple and pinnate setae proximally and one seta ventrally; ischium with one seta; merus little shorter than carpus, with one seta distally; carpus with three setae distally; propodus 1.6 times as long as carpus, with one seta ventrally and one spiniform seta dorsally; dactylus with seta; unguis broken.

Pereopod-2 ( Fig. 45D ): Of walking type; coxa present; basis with one seta proximally and one seta on ventral margin; longer than merus and carpus combined; ischium with one seta; merus almost as long as car- pus, with one spiniform setae distally; carpus with three spiniform setae ventrally and two (short and long) dorso-distal setae; propodus a little longer than merus and carpus combined, with spiniform seta ventrally and one long seta (reaching half length of unguis) dorsally; dactylus half as long as unguis.

Pereopod-3 ( Fig. 45E ): Similar to pereopod-2, but merus with spiniform and simple seta.

Pereopod-4 ( Fig. 45F ): Coxa absent: Basis clearly shorter than rest of articles combined, with two pinnate setae on ventral margin; ischium with two setae ventrally; merus with two spiniform setae ventrally and small spines arranged in combs on ventral margin; carpus with two spiniform setae and prickly tubercles surrounded by dense spines; propodus five times as long as wide, with two spiniform ventral setae and with distal setae reaching end of dactylus; dactylus and unguis combined half as long as propodus; unguis distally simple with row spines on ventral margin.

Pereopod-5 ( Fig. 45G ): Similar to pereopod-4.

Pereopod-6 ( Fig. 45H ): Similar to pereopod-4, but propodus with two short setae (as long as half of dactylus) and one long seta (reaching over unguis).

Pleopods 1–5 ( Fig. 45I ): Endopod with 16 plumose setae on outer margin; exopod with eleven setae on outer margin and one seta on inner margin; large gap between most proximal seta and others.

Uropod ( Fig. 45J ): Exopod and endopod two-articled; endopod twice as long as peduncle; exopod twothirds length of endopod.

Distribution: Vicinity of South Georgia, South Shetland Islands and Eastern Weddell Sea and at depths from 2147 to 4758 m.

Remarks: From the other Torquella species T. eltaninae n. sp. can be distinguished by its more compact body, with pereonites 2–4 about as wide as long. The main diagnostic character is the long seta on the propodus of pereopod-6.

Figures

FIGURE 44. Torquella eltaninae n. sp. A) Holotype, female, dorsal view. B) Holotype, female, lateral view; C) Carapace ventral side; D) Antennule; E) Antenna; F) Right mandible; G) Left mandible; G’) Molar process; H) Maxillule; H’ detail of terminals setae. Scale = 0.1 mm.

FIGURE 45. Torquella eltaninae n. sp., female paratype. A) Maxilliped; B) Cheliped; C) Pereopod-1; D) Pereopod-2; E) Pereopod-3; F) Pereopod-4; G) Pereopod-5; H) Pereopod-6; I) Pleopod; J) Uropod. Scale 0.1 mm.