Typhlamia sandersi ( Kudinova-Pasternak, 1985 ) 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 : 90-92

Typhlamia sandersi ( Kudinova-Pasternak, 1985) n. comb.

( Figs 50–51 )

Typhlotanais sandersi: Kudinova-Pasternak (1985) 120: 52–64; Larsen (2005): 210.

Material examined: Holotype: female (Mh 4), Vitjaz Station , Great Meteor, 29°50'N, 28°08'6E, depth 3080– 3140 m. NE Atlantic.

Diagnosis: Carapace longer than wide. Pereopod-1 carpus seta almost as long as propodus; pereopod-2 merus with seta not reaching the end of carpus, carpus with two setae reaching the end of propodus. Uropod exopod as long as endopod proximal article.

Description: Nonovigerous female. Body length 4 mm ( Figs 50A ), long, 8.2 times as long as broad. Carapace smooth, rounded laterally, 1.2 times as long as wide, 14 % of total body length; rostrum blunt. Pereonites smooth, slightly rounded lateral margins, pereonite-1 shortest, a little longer than pereonite-6; pereonite- 2 almost as long as pereonite-5, 1.5 times as long as pereonite-1; pereonites 3 and 4 subequal, as long as wide. Pleon 21% of body length, as long as pereonites 5 and 6 combined; pleonites 1–5 similar in size; pleotelson semi-rounded; caudal projection prominent.

Antennule ( Fig. 50B ): Twice as long as carapace; article-1 almost seven times as long as wide, with a few simple and pinnate setae on outer, inner and distal margin; two distal setae exceeding tip of article-2; article-2 with two simple setae and one pinnate seta distally; article-3 twelve times as long as wide, tipped by five long simple setae.

Antenna ( Fig. 50C ): Article-2 more than 1.5 as long as article-3, with one seta; article-3 naked; article-4 twice as long as article-5, with two simple and two pinnate setae distally; article-5 with one distal setae; article-6 tipped by six setae distally.

Mouth parts: Labrum ( Fig. 50D ) flat, covered by minute setae. Mandible ( Figs 50 E,F ) stout; molar process well-developed, with crenulated distal margin; lacinia mobilis on left mandible well-developed, crenulated. Maxillule ( Fig. 50G ) endite with eight spiniform setae distally; palp ( Fig. 50 G’) with two setae distally. Maxilla lost during dissection. Maxilliped ( Fig. 50H ): bases fused little longer than wide; each with simple setae reaching far over endites; endite with two tubercles on distal margin; 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 four setae on inner margin; article-4 slender (twice as long as wide), with one simple seta on outer margin and five terminal setae. Epignath lost during dissection. Labium ( Fig. 50I ) bi-lobed, outer corner of inner lobe and outer lobe with minute setae.

Cheliped ( Fig. 51A ): Basis a little longer than wide, with one seta on dorsal margin; merus wedgeshaped, with one long seta ventrally; carpus less than three times as long as broad, with two dorsal setae and with two long setae ventrally; propodus and fixed finger as long as 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. 51B ): Coxa with seta; basis as long as merus, carpus and half of propodus combined; ischium with simple seta; merus as long as carpus, with simple seta distally; carpus with four short and one long (as long as propodus) setae distally; propodus 1.3 times as long as carpus, with one long seta subdistally on ventral margin and two short setae on dorsal margin; dactylus as long as half of unguis, together 0.7 times length of propodus.

Pereopod-2 ( Fig. 51C ): Coxa present; basis as long as merus, carpus and half of propodus combined; ischium with simple seta; merus little shorter than carpus, with one simple seta and one thick seta distally; carpus with one short, two long and two spiniform setae distally; propodus a little longer than carpus, with one spiniform seta ventrally and two subdistal simple setae on dorsal margin; dactylus almost as long as unguis.

Pereopod-3 broken.

Pereopod-4 ( Fig. 51D ): Clinging type; basis with one seta ventrally; ischium with two setae ventrally; merus with one simple and one spiniform seta; carpus with hooks distally and small prickly tubercles; propodus six times as long as wide, with two spiniform ventrodistal setae and with distal setae reaching over half dactylus; unguis with bifid tip.

Pereopod-5 ( Fig. 51E ): Similar to pereopod-4.

Pereopod-6 ( Fig. 51F ): Similar to pereopod-4, but propodus with three distal setae, as long as dactylus.

Pleopods 1–5 ( Fig. 51G ): Basal article naked; exopod with ten plumose setae on outer margin and one seta on inner margin; endopod with 19 pinnate setae on outer margin. Gap between most proximal setae and the other setae in both rami.

Uropod ( Fig. 51H ): Endopod two-articled; proximal article 1.3 times as long as distal, with two distal seta (one longer than proximal article), distal article tipped by four simple setae; exopod one-articled, as long as proximal endopod article, tipped by one strong, long and one short simple setae.

Distribution: This species is known only from the type locality: North-eastern Atlantic, west of Tenerife at the depth range of 3080–3140 m.

Remarks: The relatively good condition of the holotype allowed partial dissection of the specimen. T. sandersi is most similar to T. bella n. sp., but it can be distinguished by the setation of the cheliped, pereopod 1 and 2. On the carpus of pereopod-1 of T. sandersi one of the distal setae reaches the end of the propodus, while the longest seta on the same article in T. bella reaches to just half the length of the propodus. The dorsal setae on the pereopod-2 propodus are subequal in T. sandersi while in T. bella there is one short and one long; finally, the cheliped merus ventral seta is much longer in T sandersi than T. bella .

Figures

FIGURE 50. Typhlamia sandersi. A) Holotype, female, dorsal view; B) Antennule; C) Antenna; D) Labrum; E) Left mandible; F) Right mandible; G) Maxillule; G’) Palp; H) Maxilliped; I) Labium. Scale: A = 1 mm; B, C = 0.1 mm; E-I = 0.01 mm.

FIGURE 51. Typhlamia sandersi, female paratype. A) Cheliped; B) Pereopod-1; C) Pereopod-2; D) Pereopod-3; E) Pereopod-4; F) Pereopod-6; G) Pleopod; H) Uropod. Scale = 0.1 mm.