Figure 6. Typhlotanais Compactus, Female A In Family Nototanaidae Sieg, 1976 And Typhlotanaidae Sieg, 1984 Author Błażewicz-Paszkowycz, Magdalena text Zootaxa 2007 2007-09-28 1598 1 141 http://dx.doi.org/10.5281/zenodo.178692 journal article 10.5281/zenodo.178692 1175­5334 7604A52C-F935-459C-91DD-F7C7AD9F2CC6 Larsenotanais amabilis n. sp. ( Figs 20–22 ) Material examined: Holotype : non-ovigerous female, ( K 41345 ), ANT XXII/2 , 60 °38.35'– 60° 38.12'S , 53°57.36'– 53° 57.49'W , depth 2893– 2893 m , EBS, 30 Jan 2002 ; Paratypes : two females (one dissected on slides), ( K 41346 ), the same locality ; one female , ( K 41438 ), ANT XXII/2 , PS 61/42-2, 59°40.29'– 59°40.42'S , 57°35.43'– 57°35,27'W , depth 3683– 3680 m , EBS, 27 Jan 2002 . Diagnosis: as for the genus Etymology: Amabilis (Lat.) = pleasant. Description: Non-ovigerous female ( Figs 20A, B ). Body short, 4.4 times as long as wide. Carapace 0.8 times as long as wide, tapering proximally, rounded laterally; all pereonites wider than long, clearly rounded laterally; pereonites 1–3 subequal, three times as wide as long; pereonites 4–5 2.4 times as wide as long; pereonite-6 a little shorter than pereonite-5, 2.7 times as wide as long; pereonites 1 and 2 with small lateral seta; pleon 1.5 times as long as carapace; pleotelson gently rounded; caudal projection well-developed, with two setae. Antennule ( Fig. 21A ): Article-1 about three times as long as wide, 1.4 times as long as article-2 and 3 combined, with five simple setae on inner margin, outer margin with one simple and two pinnate setae at middle and distally; article-2 0.6 times as long as article-3, with one long, simple seta and two pinnate setae distally; article-3 with three long and two short, terminal setae. Antenna ( Fig. 21B ): Article-1 damaged during dissection; article-2 with one distal seta; article-3 naked; article-4 twice as long as article-5, with two simple and two pinnate setae distally; article-5 with simple seta distally; article-6 with four three terminal setae. Mouth parts: Labrum lost during dissection. Mandible ( Fig. 21D,E ) stout; molar well-developed (Fig. E’), with regular tubercles on distal edges and three spines on lower margin; lacinia mobilis well-developed, crenulated. Maxillule ( Fig. 21F ) inner endite with eight terminal setae; palp lost during dissection. Maxilla ( Fig. 21G ) semi-oval. Labium ( Fig. 21H ) with bunch of setae on outer corner of inner lobe; outer lobe with small setae. Maxilliped ( Fig. 21I ) bases with simple setae reaching over endite; each endite armed with two middle setae and two tubercles on distal margin; palp article-1 naked; article-2 wedge-shaped, with three setae (one strongly serrated) on inner margin and one short, simple seta on outer margin; article-3 trapezoidal, with four setae on inner margin; article-4 with one simple seta on outer margin and five terminal setae (one shorter than others). Cheliped ( Fig. 22A ): Basis 1.8 times as long as wide; merus wedge-shaped with seta ventrally; carpus three times as long as wide, with two simple setae ventrally and two short setae dorsally; carpal shield poorly developed; chela as long as carpus, three times as long as wide; fixed finger with three setae on inner margin and two simple setae ventrally; dactylus almost straight, with one short seta proximally. Pereopod-1 ( Fig. 22B ): Of walking type ; coxa present; basis as long as merus, carpus and half of propodus combined, with one medial seta dorsally; ischium with one simple seta; merus slightly shorter than carpus with three setae distally; carpus a little longer than merus with three setae distally and one minute seta subdis- tally on ventral margin; propodus slightly longer than carpus with one seta dorsally and one ventral seta subdistally; unguis 1.5 times as long as dactylus; unguis and dactylus combined 0.6 times length of propodus. Pereopod-2 ( Fig. 22C ): Of walking type ; coxa with one seta; basis little shorter than rest of articles combined, with one proximal setae dorsally; ischium with one seta; merus as long as carpus, with three setae distally; carpus as long as merus, with two simple setae, two minute and one spiniform setae distally; propodus with two subdistal setae dorsally (one longer than unguis) and one spiniform seta ventrally; dactylus shorter than unguis. Pereopod-3 ( Fig. 22D ): Similar to pereopod-2. Pereopod-4 ( Fig. 22E ): Similar to pereopod-5 (basis damaged). FIGURE 20. Larsenotanais amabilis n. sp. , holotype, female. A) dorsal view; B) lateral view. Scale = 0.1 mm FIGURE 21. Larsenotanais amabilis n. sp. , female paratype. A) Antennule; B) Antenna; C) Left mandible incisor; D) Right mandible; E) Molar details F) Maxillule; G) Maxilla H) Labium; I) Maxilliped. Scale: A, B = 0.1 mm; C-I = 0.01 mm. Pereopod-5 ( Fig. 22F ): Of clinging type ; basis wide, with two pinnate setae disto-ventrally; ischium with two setae; merus almost as long as carpus, with two subdistal spiniform setae and numerous combs of spines on ventrally; carpus with hooks distally, one sensory seta dorsally, and with rounded, small (less than half as long as article) prickly tubercles ventrally; propodus five times as long as wide, with one pinnate seta dorsally and two spiniform setae ventrally, one seta reaching half dactylus; dactylus tipped by simple unguis; dactylus and unguis 0.7 times as long as propodus. FIGURE 22. Larsenotanais amabilis n. sp. , female paratype. A) Cheliped; B) Pereopod-1; C) Pereopod-2; D) Pereopod-3; E) Pereopod-4; F) Pereopod-5; G) Pereopod-6; H) Pleopod; Uropod. Scale = 0.1 mm. Pereopod-6 ( Fig. 22G ): Similar to pereopod-5, but propodus with three terminal setae not reaching half length of unguis. Pleopods 1–5 ( Fig. 22H ): All pleopods similar; exopod outer margin with eight plumose setae, innermargin with one plumose seta; endopod armed with fourteen plumose setae on outer margin; both rami with gap between proximal seta and others. Uropod ( Fig.22I ): Basal article less than half as long as endopod; both rami uni-articled; endopod 1.5 times as long as exopod, with pinnate setae on inner margin and six setae terminally; exopod and endopod two-articled; exopod tipped by short and long seta. Distribution: West Antarctic, North Weddell Sea and North of South Shetland Island at depths ranging from 2893 to 3683 m .