Typhlotanais greenwichensis Shiino, 1970

Błażewicz-Paszkowycz, Magdalena, 2007, Figure 6. Typhlotanais Compactus, Female A In Family Nototanaidae Sieg, 1976 And Typhlotanaidae Sieg, 1984, Zootaxa 1598, pp. 1-141 : 98-103

Typhlotanais greenwichensis Shiino, 1970

( Figs 55–57 )

Typhlotanais greenwichensis: Shiino (1970) 1: 95–98; Kudinova-Pasternak (1975) 103: 211, 226; Shiino ((1978)1979) 5: 85–86; Larsen (2005): 209.

Peraeospinosus adipatus: Błażewicz & Jażdżewski (1996) 17(3–4): 215–216, 219; Błażewicz-Paszkowycz & Jażdżewski (2000): 179, non Peraeospinosus adipatus ( Tzareva, 1982) .

Material examined: Admiralty Bay – central basin: 12 females , OC-336, 24 Mar 1981, depth 21 m; one female, C-734, 10 Jan 1988, depth 400–600 m; two females, OC-736, 17 Dec 1988, depth 480m; Ezcurra Inlet: one female, OC-366, 19 Oct 1983, depth 226m; one female, OC-411, 11 Jan 1985, depth 81 m; Section I: one female, OC-270, 21 Jan 1980, depth 175 m; one female, OC-452, 15 Mar 1985, depth 37 m; one female, OC-431, 8 Feb 1985, depth 120 m; one female, OC-444, 21 Feb 1985, depth 175 m; one female, OC- 496, 9 Sep 1985, depth 187 m; 3 females, OC-485, 10 Oct 1985, depth 232 m; two females, OC-548, 8 Jan 1985, depth 296 m; one female, OC-447, 9 Sep , depth 317 m; one female , OC-520, 3 Nov 1985, depth 335 m; one female, OC-449, 9 Mar 1985, depth 349 m; one female, OC-448, 9 Mar 1985, depth 352 m; Section II: 14 females OC-321, 17 Mar 1980, depth 290 m; one female OC-252 Jan 1980, depth 240 m,; Section III: four females, OC-303, 7 Mar 1980, depth 12 m.

Diagnosis: Antennule longer than carapace; article-2 half as long as article-3. Antenna article-4 seven times as long as wide. Cheliped carpus three times as long as wide. Pereopods 2–3 merus with long setae (longer than half of carpus); propodus with simple seta ventrally; uropod rami one-articled.

Complementary description: Female 4.6 mm ( Fig. 55A, B ), body long, 6.8 times as long as wide; carapace smooth, slightly longer than wide, lateral margins slightly rounded; rostrum pointed; pereonites smooth, all wider than long; pereonite-1 shortest, almost twice as wide as long, half as long as pereonite-3; pereonites 2, 4 and 5 subequal, 1.5 times as long as pereonite-1; pereonite-3 longest; pereonite-6 0.6 times as long as pereonite-5. Pleon 1.5 times as long as carapace; pleonites 1–5 similar in size; pleotelson rounded.

Antennule ( Fig. 56A ): Article-1 slender, almost four times as long as wide, with two simple setae along article and five simple setae distally; article-2 with one simple seta distally; article-3 twice as long as article-2, with apical spur and four distal setae.

Antenna ( Fig. 56B ): Article-2 with two setae distally, just longer than wide, almost twice as long as article-3; article-4 7.5 times as long as wide, twice as long as article-5, with one long and six short setae distally; article-5 with one simple seta distally; article-6 very short, with three terminal setae.

Mouth parts: Labrum ( Fig. 56C ) hood-shaped, with minute setae. Mandible ( Figs 56D,E ) molar welldeveloped, longer than incisor with irregular edges; incisor blunt; lacinia mobilis well-developed, crenulated. Maxillule ( Fig. 56F ) endite with eight apical spiniform setae, palp with two terminal setae (not drawn). Labium both lobes ( Fig. 56G ) poorly separated and sparsely setose distally. Epignath ( Fig. 56I ) curved, simple distally. Maxilliped ( Fig. 56H ): coxa reduced; basis fused into heart-shaped plate, 1.5 times as long as wide, with long seta; endite with two simple setae and two tubercles distally; palp article-1 unarmed; article-2 wedge-shaped, with three setae on inner margin and one minute seta on outer margin; article-3 trapezoidal, with four serrated setae on inner margin; article-4 slender, with one simple seta on outer margin and five serrated distal setae.

Cheliped ( Fig. 57A ): Basis slightly rounded, twice as long as wide; merus wedge shaped, with one seta ventrally; carpus with one long, one short and one minute seta ventrally and with seven minute setae along dorsal margin; propodus slightly shorter than carpus, with distal seta on inner side; fixed finger (propodus projection) tipped by strong spine, with three setae on well-calcified inner margin and two setae ventrally.

Pereopod-1 ( Fig. 57B ): Slender (walking type); coxa with spur; basis six times as long as wide, almost as long as carpus and propodus combined, with four setae dorsally; ischium short, with one seta; merus almost as long as carpus, with two simple setae distally; carpus with six simple setae distally; propodus 1.3 times as long as carpus, with three setae subdistally and one seta ventrally; dactylus half as long as unguis; both together little shorter than propodus.

Pereopod-2 ( Fig. 57C ): Slender (walking type); coxa with spur; basis 4.5 times as long as wide, with four setae dorsally and one ventrally; ischium with simple seta; merus a little shorter than carpus, with three simple setae distally; carpus with four simple setae and one spiniform distally; propodus almost as long as merus and carpus combined, with one simple seta ventrally and two setae dorsally; dactylus almost as long as unguis, with one simple seta.

Pereopod-3 ( Fig. 57D ): Similar to pereopod-2.

Pereopod-4 ( Fig. 57E ): Clinging type; basis robust, twice as long as wide, with three setae ventrally; ischium with two setae; merus with two spiniform seta ventrally; carpus with spine distally and with prickly tubercles surrounded by row of minute spines; propodus with two spiniform ventrally and one dorso-distal setae little shorter than dactylus; dactylus three times as long as unguis; both subequal to propodus.

Pereopod-5 ( Fig. 57F ): Similar to pereopod-4.

Pereopod-6 ( Fig. 57G ): Similar to as pereopod-5, but propodus with three dorso-distal setae.

Pleopod ( Fig. 57H ): Basal article naked; exopod with one seta on inner margin and twelve plumose setae on outer margin; endopod with eighteen plumose setae on outer margin; clear gap between proximal seta and other setae.

Uropod ( Fig. 57I ): Basal article as long as wide; both rami one-articled; exopod 0.7 times as long as endopod, with one strong seta and one regular seta distally; endopod tipped by one strong, four regular and one pinnate setae.

Distribution: Antarctic: Antarctic Peninsula, South Shetland Islands, South Sandwich Islands at the depth range of 12– 757 m.

Remarks: Typhlotanais greenwichensis can be distinguished from the Mediterranean T. messinensis by lacking a spiniform seta on the merus of pereopods 2 and 3 and in having relatively long setae on the merus, carpus and propodus of the same appendages (those on the merus reach half the length of the carpus). T. messinensis also has spiniform setae on the ventral side of the propodus.

Figures

FIGURE 55. Typhlotanais greenwichensis, female. A), lateral view; B) dorsal view. Scale 1 mm.

FIGURE 56. Typhlotanais greenwichensis, female. A) Antennule; B) Antenna; C) Labrum; D) Left mandible; E) Right mandible incisor; F) Maxillule; G) Labium; H) Maxilliped; I) Epignath. Scale: A, B = 0.1 mm; C-I = 0.01 mm.

FIGURE 57. Typhlotanais greenwichensis, female. A) Cheliped; 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.