Pulcherella juraszi, 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 : 61-65

Pulcherella juraszi n. sp.

( Figs 32–34 )

Material examined: Holotype: female, ( K 41342 ), ANT XXII/3 , PS 78-9, 71°09.39'– 71°09.36'S 13°59.30'– 13°58.81'W, depth 2156– 2147 m, epibenthic sledge, 21 Feb 2005 ; Paratypes: two females, ( K 41343 ), ANT XXII/3 , PS 121-11-E, 63°37.73'- 63°37.55'S, 50°38.09'– 50°38.37'W, depth 2663– 2659 m, epibenthic sledge, 15 Mar 2005 ; two females, ( K 41344 ), ANT XXII/3 , PS 133-2, 62°46.49'– 62°46.38'S, 53°03.50'–53°03.98', depth 1584– 1579 m, epibenthic sledge, 16 Mar 2005 .

Diagnosis: Pereopod-1 carpus with long seta (little shorter than propodus), dactylus and unguis combined longer than propodus; pereopods 2 and 3 carpus with seta (-ae) about half as long as following article; pereopods 4–6 with long unguis (over half as long as dactylus); pereopod-6 compact (propodus twice as long as wide). Uropod exopod little longer than endopod proximal article.

Description: Non-ovigerous female. Body length 1.7 mm ( Figs 32A, B ), long, ten times as long as broad. Carapace smooth, rounded laterally, 1.5 times as long as wide, 18 % of total body length; rostrum blunt. Pereonite-1 trapezoid, tapering distally as long as wide; pereonites 2 and 3 slightly rounded 1.5 times as long as wide; pereonites 4 and 5 little shorter than pereonite-3; pereonite-6 shortest, almost twice as wide as long. Pleon little longer than carapace, tapering distally; pleonites 1–5 similar in size; pleotelson semi-rounded; caudal process poorly developed.

Antennule ( Fig. 33A ): Shorter than carapace; article-1 half as long as article-2, with one simple and two pinnate setae at middle and one seta distally; article-2 with one seta; article-3 five times as long as wide, 2.5 times as long as article-2, tipped by two short and three long setae.

Antenna ( Fig. 33B ): Article-2 about half as long as article-3; article-3 with one small seta; article-4 thick, three times as long as wide, just twice as long as article-5, with two long, two short and two pinnate setae distally; article-5 with one distal setae; article-6 tipped by four setae distally.

Mouth parts: Labrum ( Fig. 33C ) covered by numerous small setae. Mandible ( Figs 33D , D’,E) stout; molar process well-developed, distal margin with about eight tubercle-like structures; lacinia mobilis welldeveloped, with four teeth distally. Maxillule ( Fig. 33F ) endite with eight spiniform setae distally. Maxilla ( Fig. 33G ) suboval. Maxilliped ( Fig. 33I ): bases fused, about as long as wide, with simple setae reaching end of endites; endite with one tubercle and one seta in mid-distal corner; palp four-articled: article-1 naked; article-2 wedge-shaped, with three setae on inner margin and one seta on outer margin; article-3 trapezoidal, with three bipinnate and one short simple setae on inner margin; article-4 with one simple seta on outer margin and five bipinnate terminal setae. Epignath lost during dissection. Labium ( Fig. 33H ) bilobed, outer corner of inner lobe and outer lobe with minute setae.

Cheliped ( Fig. 33J ): Basis twice as long as wide, with one seta long on dorsal margin; merus wedgeshaped, with one long seta ventrally; carpus twice as long as broad, with two dorsal setae and with two long setae ventrally; propodus and fixed finger little longer than carpus, about 2.5 times as long as wide; fixed finger with three setae and three calcified teeth on inner margin and two setae on ventral margin; dactylus with one seta in proximal part of dorsal margin.

Pereopod-1 ( Fig. 34A ): Coxa with seta; basis as long as merus, carpus and half of propodus combined; ischium with simple seta; merus little shorter than carpus, with simple seta distally; carpus with one short seta ventrally, two setae dorso-distally (one little shorter than propodus); propodus 1.4 times as long as carpus, with one subdistal seta ventrally and two subdistal setae dorsally; dactylus little shorter than propodus, dactylus and unguis combined longer than propodus.

Pereopod-2 ( Fig. 34B ): Coxa without seta; basis as long as merus, carpus and half of propodus combined with one pinnate seta dorsally; ischium with simple seta; merus little shorter than carpus, with simple seta distally; carpus with two long and two short setae distally; propodus 1.2 times as long as carpus, with one subdistal seta ventrally and two subdistal setae dorsally; dactylus little shorter than unguis; dactylus and unguis combined a little shorter than propodus.

Pereopod-3 ( Fig. 34C ): Similar to pereopod-2, but merus with two seta and one of propodus dorsal seta shorter than the others.

Pereopod-4 ( Fig. 34D ): Clinging type; basis with one pinnate seta proximally on dorsal margin; ischium with one seta ventrally; merus with two spiniform setae distally; carpus with spiniform seta distally and flat prickly tubercle as long as half of carpus; propodus over three times as long as wide, with two spiniform ventro-distal setae and with distal seta reaching dactylus; unguis simple, little shorter than dactylus.

Pereopod-5 ( Fig. 34E ): Similar to pereopod-4.

Pereopod-6 ( Fig. 34F ): Similar to pereopod-4, but propodus compact, twice as long as wide, with three distal setae, little shorter than dactylus.

Pleopod: Both exopod and endopod without setae.

Uropod ( Fig. 34G ): Endopod two-articled, 2.5 times as long as basal article; proximal article almost as long as distal article, with one distal seta; distal article tipped by five simple setae; exopod one-articled, a little longer than endopod proximal article, tipped by strong, long and short simple setae.

Distribution: Antarctic: Weddell Sea, in the vicinity of Elephant Island at depths of 1579–2663 m.

Remarks: The inclusion of Pulcherella juraszi n. sp. in the genus Pulcherella may be doubtful owing to the lack of setation on the pleopods, and the presence of a simple and relatively long unguis on pereopods 4– 6. Also it has two spiniform setae on the merus of pereopods 4–6 instead of one simple and one spiniform seta as in the other species of Pulcherella . Although these characters clearly distinguish P. juraszi from the other Pulcherella species , the new species has been included in the genus as it shares more characters in common with its members than with the other typhlotanaids.

Figures

FIGURE 32. Pulcherella juraszi n. sp. A) Holotype, female, dorsal view; B) Holotype, female, lateral view. Scale = 0.1 m.

FIGURE 33. Pulcherella juraszi n. sp., female paratype. A) Antennule; B) Antenna; C) Labrum; D) Left mandible; D’) Molar process; E) Right mandible; F) Maxillule; G) Maxilla; H) Labium; I) Maxilliped; J) Cheliped. Scale: A, B, J = 0.1 mm, C-H = 0.01 mm.

FIGURE 34. Pulcherella juraszi n. sp., female paratype. A) Pereopod-1; B) Pereopod-2; C) Pereopod-3; D) Pereopod-4; E) Pereopod-5; F) Pereopod-6; G) Uropod. Scale = 0.1 mm.