Hamatipeda longa ( Kudinova-Pasternak, 1975 ) 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 : 35-37

Hamatipeda longa ( Kudinova-Pasternak, 1975) n. comb.

( Fig. 16 )

Typhlotanais longus: Kudinova-Pasternak (1975) 103: 212–213, 215.

Material examined: Non-ovigerous female holotype (MC-978), Sta. 929, r/v Akademik Kurtchatov, Falkland Islands, 52º08.5'S, 57º16.1'W, depth 720 m.

Diagnosis (female): Pereonite-3 twice as long as wide. Pereonites 1–3 lateral margins parallel. Cheliped fixed finger ventral setae extending beyond the article. Uropod exopod clearly shorter than endopod.

Complementary description: Ovigerous female. Body length 3.5 mm ( Fig. 16A,B ), body very long, about twelve times as long as wide; carapace smooth, narrowed anteriorly, little longer than wide. Pereonites smooth with parallel lateral margins; pereonite-1 little shorter than carapace; pereonites 2 and 3 the longest; pereonite-2 1.5 times as long as pereonite-1; pereonite-6 shortest. Pleonites 1–5 subequal; pleotelson with distal projection.

Antennule ( Fig. 16C ): Article-1 about 1.5 times as long as wide, with two distal and medial pinnate setae and one simple distal seta; article-2 0.3 times as long as article-3, with one simple seta; article-3 with three terminal simple setae.

Antenna ( Fig. 16D ): Article-1 broken; article-2 longer than article-3; articles 2 and 3 with one simple seta; article-4 twice as long as article-5, with three simple and two pinnate setae distally; article-5 with one simple seta distally; article-6 with four setae.

Mouth parts: Labrum missing. Mandible ( Fig. 16E ) stout; molar process well-developed, with crenulated, well-calcified edge; lacinia mobilis well-developed with five teeth. Maxillule and maxilla missing. Maxilliped ( Fig. 16G ) basis elongate and fused; endites separated, each with one seta only on distal margin; palp with four articles: article-1 naked; article-2 wedge-shaped, with one seta on outer margin; article-3 trapezoidal in shape with five setae on inner margin; article-4 slender (1.5 times as long as wide) with six terminal setae. Labium ( Fig. 16F ) inner lobe with a few setules.

Cheliped ( Fig. 16H ): Basis twice as long as wide; merus wedge-shaped, with one seta on ventral margin; carpus over 1.6 times as long as wide, with one long seta ventrally and two short setae dorsally (proximally and distally); chela narrower than carpus, 1.5 times as long as wide, with one seta at insertion of dactylus; inner margin of fixed finger with two, or three teeth and three setae in distal part, ventral margin with two long simple setae; dactylus slightly curved.

Pereopod-1 ( Fig. 16I ): Of walking type; basis naked and shorter than merus, carpus and propodus combined length; ischium with one seta; merus almost as long as carpus, with one distal seta; carpus with four short setae distally; propodus with two, subdistal setae on dorsal margin and one small seta ventrally; unguis twice as long as dactylus; together as long as propodus.

Pereopod-2 ( Fig. 16J ): Of walking type; basis almost as long as carpus and propodus combined; ischium with one seta ventrally; merus almost as long as carpus with one distal seta; carpus with two simple seta and one spiniform seta; propodus 1.5 times as long as carpus, dorsal margin with one seta distally and one spiniform seta ventrally; dactylus almost as long as unguis.

Pereopod-3 ( Fig. 16K ): Similar to pereopod-2.

Pereopod-4 ( Fig. 16L ): Of clinging type; basis narrow about three times as long as wide; ischium with two setae ventrally; carpus little longer than merus, each with two large hook-like setae, carpus additionally with one seta dorsally; propodus as long as carpus with two setae ventrally and one dorsal terminal seta; unguis tip trifurcated.

Pereopod-5 missing.

Pereopod-6 similar to pereopod-4, but propodus with three terminal setae dorsally (according to Kudinova-Pasternak, 1975: 215).

Pleopods 1–5 ( Fig. 16M ): All pleopods similar; basal article naked, most proximal seta of both exopod and endopod separated from others by gap; exopod outer margin with eight plumose setae, inner margin with one plumose seta; endopod with twelve plumose setae on outer margin.

Uropod ( Fig. 16N ): Uropod exopod with one article, endopod two-articled; exopod about as long as proximal article of endopod.

Male: Unknown.

Distribution: Species known only from the type locality: Scotia Arch, Falkland Islands (52º08.5'S, 57º16.1'W), depth 720 m.

Remarks: This complementary description has been prepared after studying the holotype that lacks the head, pleotelson and pereopods 5 and 6, so it has had to be supported by the description and drawing made by Kudinova-Pasternak (1975). In the illustrations made by Kudinova-Pasternak there are some inconsistencies in the antennule and antenna setation. It is thought that the plumose seta drawn for antennule article-2 belongs to article-1 and the proximal seta drawn for the antenna article-5 belongs to article-4.

Figures

FIGURE 16. Hamatipeda longa. A) Holotype, female, dorsal view; B) Holotype, female, present state; C) Antennule; D) Antenna; E) Right mandible; F) Labium; G) Maxilliped; H) Cheliped; I) Pereopod-1; J) Pereopod-2; K) Pereopod-3; L) Pereopod-4; M) Pleopod; N) Pleotelson with uropods. Scale: A, B = 1 mm; C, H-M = 0.1 mm; E-G = 0.1 mm; D, F = 0.05 mm; E = 0.03 mm. A, C–G after Kudinova-Pasternak (1975).