Pulcherella pulcher ( Hansen, 1913 ) 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 : 56-60

Pulcherella pulcher ( Hansen, 1913) n. comb.

( Figs 29–31 )

Typhlotanais pulcher: Hansen (1913) 3(3): 39–40; Nierstrasz (1913) 32 (a): 36; Stephensen (1913) 22: 267–268, 418; Stephensen (1932) 6: 350; Stephensen (1936) Medd. Gronl. 80(2): 29; Lang (1970) (2), 23 (4): 276, 287; Holdich & Jones (1983a): 62–63; Holdich & Jones (1983b) 17: 158, 172, 175, 177–179; Holdich & Bird (1985): 443; Hassack & Holdich (1987) 16(3): 224 225, 227; Larsen (2005): 210.

Material examined: Holotype: Ingolf Station , South of Davis Strait, St. 38, 59°12'N, 5l°05'W, depth 3420 m (1870 fm); two females (one dissected on slides), BIOICE 2836, Shipek Grab, 26 Aug 1995, 63º16.64’N, 16.52º00’W, depth 615 m, bottom temp. 6.74ºC, salinity 35.12, silty sand.

Diagnosis: Pereopods 2 and 3 with long setae on merus and carpus, almost as long as following article respectively; pereopods 4 and 5 propodus distal seta not reaching the end of dactylus.

Description: Female ( Figs 29A,B ). Body 2.2 mm long, cylindrical, about nine times as long as wide; cephalothorax shorter than pereonite-1. Pereonites 1–4 longer than wide. Pereonites 5 and 6 wider than long; pereonite-5 1.5 times as long as pereonite-6; pereonite-6 twice as wider as long. Pleon short (including pleotelson only about 12 % of total body length); pleonites subequal, carrying pleopods; pleotelson as long as combined length of two pleonites.

Antennule ( Fig. 30A ): Article-1 longer than distal two articles combined, four times as long as wide, with two medial and two distal simple setae; article-2 less than half as long as article-3, with two simple distal setae; article-3 about six times as long as wide, less than half of article-1 length, with three simple distal setae.

Antenna ( Fig. 30B ): Article-1 not broader than following articles, naked; article-2 little longer than article-3, with one dorsal seta; article-3 with one dorsal seta; article-4 about seven times as long as wide, three times as long as article-5, with two pinnate setae, one short and two long simple setae distally; article-5 with one distal seta; article-6 minute, with four distal setae.

Mouthparts: Labrum ( Fig. 30C ) flat and with many setules on distal margin. Mandibular molar process broad, as long as incisor, with terminal tubercles on distal edge. Left mandible ( Fig. 30D ) lacinia mobilis longer than incisor, crenulated; incisor shaped like a blunt spine. Right mandible ( Figs 30E ,E’) incisor tapering into two denticles. Labium ( Fig. 30I ) with inner and outer lobe covered with a few setules. Maxillule ( Fig. 30F ) endite with eight distal spiniform setae; palp longer than endite, with two terminal setae. Maxilla not recovered. Maxilliped ( Fig. 30G ) basis with long seta; endites as wide as basis, with two distal tubercles and one middle seta distally. Palp article-1 with microtrichae on outer margin; article-2 with one small outer and three inner setae; article-3 with four inner setae; article-4 with one outer and five inner pinnate setae. Epignath ( Fig. 30H ) rounded distally.

Cheliped ( Fig. 31A ): Basis twice as long as wide, half as long as carpus, not reaching pereonite-1 ventrally; merus with one ventral seta; carpus marginally shorter than propodus including the fixed finger, with two ventral and two small dorsal setae; propodus with one seta at dactylus insertion; fixed finger with two ventral setae and three on inner margin, well-calcified inner margin; dactylus marginally shorter than fixed finger, with two strong spiniform setae on inner margin ( Fig. 28 A’).

Pereopod-1 ( Fig. 31B ): Coxa with one seta; basis shorter than merus, carpus, and propodus combined, with three simple ventral and two small pinnate setae dorsally; ischium with one seta; merus as long as carpus, with two distal setae; carpus little shorter than propodus, with three short and one long (longer than half of propodus) setae distally; propodus longer than half of basis, with three dorso-distal setae and one ventral seta; dactylus and unguis combined shorter than propodus; dactylus half as long as unguis, with one proximal seta; unguis with spatulate tip.

Pereopod-2 ( Fig. 31C ): Coxa with one seta; basis as long as merus, carpus and propodus combined, with one dorsal seta; ischium with one ventral seta; merus with one short and one long (as long as carpus) distal setae; carpus with one short and two long (almost as long as propodus) setae; propodus with one short and one long setae (three times as long as dactylus and unguis combined length); dactylus naked.

Pereopod-3 ( Fig. 31D ): As pereopod-2, but merus with only one seta.

Pereopod-4 ( Fig. 31E ): Clinging type; basis with plumose ventro-medial seta and small dorso-proximal seta; ischium with two setae; merus little longer than carpus, with one simple and one spiniform ventro-distal seta; carpus with one distal seta and one large and flat prickly tubercle; propodus with two ventro-distal spiniform setae, and distal seta reaching about half length of dactylus; dactylus and unguis together shorter than propodus, unguis with bifid tip.

Pereopod-5 ( Fig. 31F ): As pereopod-4.

Pereopod-6 ( Fig. 31G ): As pereopod-5 except basis naked; carpus with one pinnate dorso-distal seta. Propodus with three dorso-distal setae.

Pleopod ( Fig. 31H ): Basal article naked; exopod with one inner and 14 outer plumose setae, with gap between proximal seta and other setae; endopod with 17 outer plumose setae, large gap between proximal seta and other setae.

Uropod ( Fig. 31I ): Basal article 0.3 times as long as endopod, naked; endopod 2-articled; proximal article with one simple and two pinnate medial setae; distal article with one pinnate and four simple setae; exopod 1- articled, with one medial seta and one short simple and one long thick setae distally.

Distribution: The species is known from the North Atlantic: Davis Strait (holotype) at a depth of 3422 m ( Hansen 1913), British waters (Lynn of Lorn, Western Scotland) at depth 38 m (muddy clay) and widely in the Rockall-Biscay area of the NE Atlantic (Bird pers. comm.).

Remarks: Pulcherella pulcher can be immediately distinguished from P. filatovae by presence of one long dorsal seta on the propodus of the second and third pereopods reaching far over the unguis. In P. filatovae and P. juraszi n. sp. there are two setae there, both shorter than or subequal to unguis.

According to observations by Hassack & Holdich (1987), P. pulcher constructs tubes little longer than the specimen (5 mm) covered by a fine layer of mud. The tube is sealed in front and distally deflected ventrally in the same manner as the pleotelson.

Figures

FIGURE 28. Pulcherella filiatovae (ANDEEP material). 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.

FIGURE 29. Pulcherella pulcher, holotype, female. A) lateral view; B) dorsal view; C) Pulcherella (=Typhlotanais) spiniventris. Scale: 1 mm.

FIGURE 30. Pulcherella pulcher. A) Antennule; B) Antenna; C) Labrum; D) Left mandible; E) Right mandible; E') Right mandible incisor details; F) Maxillule; F’) Palp; G) Maxilliped; H) Epignath; I) Labium. Scale: A, B,G-I = 0.1 mm; C-F = 0.01 mm.

FIGURE 31. Pulcherella pulcher, female. A) Cheliped; A’) Cheliped dactylus detalis; B) Pereopod-1; C) Pereopod-2; D) Pereopod-3; E) Pereopod-4; F) Pereopod-5; G) Pereopod-6; H) Pleopod; I) Uropod. Scale = 0.1 mm.