Typhlamia bella, 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 : 94-98

Typhlamia bella n. sp.

( Figs 52–54 )

Material examined: Holotype, female ( K 41413 ), ANT XXII-3 , PS67/81-8-E 70°32.02'– 70°32.19'S, 14°35.05'– 14°35.13'W, depth 4392-4385, 24 Feb 2005 ; Paratypes: ten juveniles females, three females (one dissected on slides, one half, one broken) ( K 41414 ), ANT XXII-3 , PS 67/81-8-E, 70°32.02'- 70°32.19'S, 14°35.05'– 14°35.13'W, depth 4392– 4385 m , EBS, 24 Feb 05;? Typhlamia bella one female ( K 41435 ), ANT XXII-3 , PS 67/154-9, 62°31.47'– 62° 31.36'S, 64°39.45'– 64° 39.25'W, depth 3804–3808 m, 30 Mar 2005 .

Diagnosis: Carapace as long as wide. Pereopod-1 carpus seta just half of propodus length; pereopod-2 merus and carpus with setae reaching end of following article. Uropod exopod as long as endopod proximal article.

Etymology: Bella (Lat.) = pretty, neat. The name reflects the author’s personal impression of the habitus of the animal.

Description: Non-ovigerous female ( Fig. 52A,B ). Body length 3.6 mm, 7.8 times as long as broad. Carapace smooth, rounded laterally, as long as wide, 13% of body length, rostrum blunt. Pereonites smooth, slightly rounded lateral margins; pereonite-6 trapezoidal; pereonite-1 is 0.7 times length of carapace; pereonites 2, 3 and 6 of similar size; pereonite-2 a little longer than pereonite-1; pereonite-4 a little longer than wide; pereonite-5 as long as wide. Pleon 20% of body length, a little shorter than pereonites 5 and 6 combined; pleonites 1–5 similar in size; pleotelson semi-rounded; caudal projection weak.

Antennule ( Fig. 53A ): Twice as long as carapace; article-1 seven times as long as wide, with five simple setae and five pinnate setae arranged in groups on inner and outer margin; article-2 with two distal setae; article-3 2.5 times as long as article-2, over ten times as long as wide, tipped by four long simple setae.

Antenna ( Fig. 53B ): Article-2 three times as long as article-3; article-4 twice as long as article-5, with three simple and two pinnate setae distally; article-5 with one distal setae; article-6 tipped by four setae.

Mouth parts: Labrum ( Fig. 53C ) covered by minute setae. Mandible ( Figs 53D,E ) stout; molar process ( Fig. 53 D’) well-developed, with crenulated distal margin; lacinia mobilis well-developed, crenulated. Maxillule ( Fig. 53F ) endite with eight spiniform setae distally; palp lost during dissection. Maxilla ( Fig. 53G ) semitriangular. Maxilliped ( Fig. 53I ) bases fused little longer than wide; each with simple seta reaching far over endites; endite armed with two setae and two tubercles on distal margin; palp four-articled: article-1 naked; article-2 wedge-shaped, with three setae on inner margin; article-3 trapezoidal, with three bipinnate and one simple setae on inner margin; article-4 slender (1.5 times as long as wide), with one simple seta on outer margin and five bipinnate terminal setae. Epignath lost during dissection. Labium ( Fig. 53H ) bilobed, outer corner of inner lobe and outer lobe with minute setae.

Cheliped ( Fig. 54A ): Basis 1.3 times as long as wide; merus wedge-shaped with one short seta ventrally; carpus about 2.5 times as long as broad with two dorsal setae and with two long setae ventrally; propodus and fixed finger about as long carpus, about three times as long as wide; fixed finger with three setae on inner margin and two setae on ventral margin.

Pereopod-1 ( Fig. 54B ): Coxa with seta; basis a little shorter than merus, carpus and propodus combined; ischium with simple seta; merus slightly shorter than carpus, with simple seta distally; carpus with four short and two long (longer than half of propodus) setae distally; propodus 1.2 times as long as carpus, with one ventral and one dorsal setae subdistally; dactylus almost as long as unguis, with seta reaching end of unguis, together 0.6 times length of propodus.

Pereopod-2 ( Fig. 54C ): Coxa with seta; basis slightly longer than merus and carpus combined; ischium with simple seta; merus a little shorter than carpus, with one short and long (as long as carpus) seta distally; carpus with two short, two long and two spiniform setae distally; propodus slightly longer than carpus, with one spiniform seta ventrally and two subdistal simple setae on dorsal margin; dactylus almost as long as unguis, with short seta.

Pereopod-3 broken.

Pereopod-4 ( Fig. 54D ): Clinging type; basis with two pinnate setae; ischium with two setae ventrally; merus with one spiniform seta and one short simple seta; carpus with two spiniform setae, small prickly tubercle, and one seta distally; propodus six times as long as wide, with two spiniform ventro-distal setae and with distal setae just reaching end of dactylus; unguis broken.

Pereopod-5 ( Fig. 54F ): Similar to pereopod-4; unguis with bifid tip.

Pereopod-6 ( Fig. 54E ): Similar to pereopod-4, but propodus with three distal setae, little shorter than dactylus..

Pleopods 1–5 ( Fig. 54G ): Basal article naked; exopod with twelve plumose setae on outer margin andone seta on inner margin; endopod with 20 plumose setae on outer margin. Gap between most proximal seta and the other setae in both rami.

Uropod ( Fig. 54H ): Endopod two-articled; proximal article 1.5 times length of distal article, with one distal seta; distal article tipped by three simple setae. Exopod one-articled, as long as endopod proximal article; tipped by one short and one long setae.

Distribution: The species occurs in the Antarctic Ocean: Eastern part of Weddell Sea, at depths of 4392- 4385 m, and in the vicinity of the South Shetland Islands at depths of 3804–3808 m.

Figures

FIGURE 52. Typhlamia bella n. sp., holotype, female A), dorsal view; B) lateral view. Scale 1 mm.

FIGURE 53. Typhlamia bella n. sp., female paratype. A) Antennule; B) Antenna; C) Labrum; D) Right mandible; D’) Molar process; E) Left mandible; F) Maxillule; G) Maxilla; H) Labium; I) Maxilliped. Scale: A, B = 0.1 mm; C-I = 0.01 mm.

FIGURE 54. Typhlamia bella n. sp., female paratype. A) Cheliped; B) Pereopod-1; C) Pereopod-2; D) Pereopod-4; E) Pereopod-6; F) Pereopod-5; G) Pleopod; H) Uropod. Scale = 0.1 mm.