Peraeospinosus pushkini ( Tzareva, 1982 )

Błażewicz-Paszkowycz, Magdalena, 2005, Revision of the genus Peraeospinosus Sieg, 1986 (Crustacea: Peracarida: Tanaidacea), Journal of Natural History 39 (45), pp. 3847-3901 : 3868-3874

Peraeospinosus pushkini ( Tzareva, 1982)

( Figures 9–11 )

Synonyms. Typhlotanais pushkini Tzareva 1982, p 56 –58.

Peraeospinosus pushkini Sieg 1986a, p 2 , 5, 7–9, 77, 79–85; 1986b, p 5, 8, 77; Błażewicz and Jażdżewski 1996, 215–217, 219; Błażewicz-Paszkowycz and Jażdżewski 2000, p 176,

178; Błażewicz-Paszkowycz and Ligowski 2002, p 11–12, 14; Błażewicz-Paszkowycz and Sekulska-Nalewajko 2004, p 224, 226–227.

Material examined

Deposited at University of Łódź, Poland: 101 specimens (spms) , OC-733, 7 December 1988, depth 400–600 m; 23 spms, OC-736, 17 December 1988, depth 300 m; three spms, OC-737, 17 December 1988, depth 480 m; three spms, OC-216, 3 March 1978, depth 290 m; two spms, OC-219, 3 March 1978, depth 285 m; 210 spms, OC-321, 17 March 1980, depth 290 m; six spms, OC-336, 24 March 1981, depth 210 m; three spms, OC-630, 31 March 1988, depth 200–270 m; one spm., OC-467, 20 March 1985, depth 33 m; one spm., OC-511, 1 October 1985, depth 129 m; eight spms, D-40, 17 December 1993, depth 40 m; eight spms, OC-292, 1 March 1980, depth 255 m; two spms, OC-432, 8 February 1985, depth 126 m; four spms, OC-444, 21 February 1985, depth 175 m; two spms, OC- 485, 10 August 1985, depth 232 m; six spms, OC-472, 27 April 1985, depth 245 m; seven spms, OC-479, 11 May 1985, depth 240 m; eight spms, OC-478, 11 May 1985, depth 252 m; two spms, OC-482, 23 July 1985, depth 254 m; three spms, OC-486, 10 August 1985, depth 270 m; two spms, OC-484, 23 July 1985, depth 278 m; two spms, OC-420, 21 January 1985, depth 280 m; 14 spms, OC-548, 8 January 1986, depth 296 m; 17 spms, OC-447, 9 March 1985, depth 317 m; two spms, OC-535, 3 December 1985, depth 333 m; 19 spms, OC-520, 3 November 1985, depth 335 m; 19 spms, OC-549, 3 November 1985, depth 337 m; 34 spms, OC-449, 9 March 1985, depth 349 m; 28 spms, OC-448, 9 March 1985, depth 352 m; 18 spms, OC-536, 3 December 1985, depth 380 m; three spms, OC-416, 17 January 1985, depth 400 m; two spms, OC-533, 15 November 1985, depth 492 m; three spms, OC-532, 18 January 1985, depth 496 m; three spms, OC- 341, 23 March 1981, depth 400–600 m; two spms, OC-279, 7 February 1980, depth 170 m; one spm., OC-274, 7 February 1980, depth 187 m; three spms, OC-252, 4 January 1980, depth 240 m; five spms, OC-253, 4 January 1980, depth 242 m; one spm., OC-249, 4 January 1980, depth 262 m.

Diagnosis

Female. Carapace rounded, swollen, little longer than wide. All pereonites wider than long. Pereonite 1 relatively short (one-third length of carapace). Pereonites 4–6 with rounded margins. Pleon little longer than carapace, pleotelson round. Antennule article 3 only two times as long as article 2. Pereopod 2 propodus long (length: width ratio about 4.4). Pereopod 6 propodus distal setae not longer than dactylus. Uropod exopod a little shorter than two-articled endopod.

Description

Female without oostegites, holotype, length 5.3 mm ( Figures 9–11 ).

Body. Body about six times as long as wide.

Cephalothorax. Smooth, rounded, swollen, little longer than wide, rostrum round.

Pereonites. All pereonites rectangular, pereonites 4–6 with slightly rounded margins.

Pleon. All pleonites similar in size; pleotelson round.

Antennule ( Figure 10A ). Article 1 massive, about 1.5 times as long as articles 2 and 3 combined, with three groups of pinnate setae and one simple seta distally; article 2 shorter than article 3, with one simple seta; article 3 with five simple setae and two pinnate setae distally.

Antenna ( Figure 10B ). Article 2 a little longer than article 3; article 3 with four simple setae; article 4 twice as long as article 5, with two minute and two pinnate distal setae; article 5 with two simple seta distally; article 6 very short with, six terminal setae.

Mouthparts. Labrum ( Figure 10C ) hood-shaped, covered by numerous short needle-like setae. Mandible ( Figure 10D, E ) robust, molar process with undulated margin and setae on ‘‘lower margin’’, lacinia mobilis well-developed, crenulated. Maxillule ( Figure 10F ) endite as long as palp, with nine apical spiniform setae (two of them fused together); palp with two pinnate setae, one longer than the other. Maxilla ( Figure 19G ) hemispherical, smooth.

Maxillipeds ( Figure 10H ). Basis fused in heart-shaped plate, with one seta on distal margin; endite with two setae and two tubercles on distal margin; palp article 1 naked; article 2 wedge-shaped, with three plumose setae on inner margin and one minute seta on outer margin; article 3 trapezoidal, with four serrated setae and one simple seta on inner margin; article 4 more slender than the others, with one simple seta in outer margin and with a group of five serrated terminal setae.

Cheliped ( Figure 10J ). Basis robust, slightly rounded, 1.8 times as long as wide, fused with the body; merus wedge-shaped, with one seta ventrally; carpus with rounded dorsal margin armed with two setae on ventral margin and row of 10 minute setae on dorsal margin; propodus with seta on inner side; fixed finger (propodus projection) tipped with a strong spine, with two to three teeth and three setae on dorsal margin, two setae on ventral margin; dactylus slightly curved, with minute seta on dorsal margin.

Pereopod 1 ( Figure 11A ). Basis smooth, with one pinnate seta in proximal part only and nine short rod setae, longer than ischium, merus and carpus together; ischium short, with one seta; merus subequal to propodus, with one spiniform and two simple setae distally; carpus with four setae and one rod seta distally; propodus with three setae, propodus length: width ratio 6; dactylus as long as unguis, with one long seta.

Pereopod 2 ( Figure 11B ). Basis little shorter than the rest of articles combined, with five rod setae; ischium short with one simple seta; merus and carpus subequal, both with one spiniform seta distally; additionally two simple setae on merus and four simple setae on carpus; propodus as long as merus and carpus combined, with one short simple seta and two spiniform distally; propodus length: width ratio 5; dactylus with one simple seta, tipped by subequal unguis.

Pereopod 3 ( Figure 11C ). Similar to pereopod 2 but spiniform setae on merus and two distal setae on carpus are modified to strong spines.

Pereopod 4 ( Figure 11D ). Basis wide, one-fifth as long as wide and clearly shorter than length of rest of articles combined, with one rod seta ventrally; ischium with two setae (one broken off); merus subequal to carpus; merus with combs of setae and two spiniform setae; carpus with two distal hooks and one seta distally; large prickly tubercles surrounded by short, blunt and well-calcified spines; propodus longer than carpus, with one pinnate setae on dorsal margin; propodus with one long seta distally and two spiniform setae ventrally; dactylus tipped by relatively short, bifurcated unguis.

Pereopod 5 ( Figure 11E ). Similar to pereopod 4 except for two additional pinnate setae on basis.

Pereopod 6 ( Figure 11F ). Similar to pereopod 5; basis with one simple seta and one pinnate seta; propodus tipped by three relatively short terminal setae (not longer than dactylus).

Pleopods ( Figure 9D ). All pleopods similar in structure; exopod and endopod with a row of plumose setae on outer margin (length: width ratio of exopod 2.6; of endopod 3.2); the most proximal seta on the exopod and endopod, separated from remainder by a gap; one plumose seta on inner margin of endopod.

Uropod ( Figure 11I ). Exopod uni-articled a little shorter than endopod; endopod with two articles; endopod article 1 with two pinnate setae distally; endopod article 2 tipped by four long and one short simple setae and two pinnate setae; exopod with short simple seta in proximal part of outer margin, one strong seta and one minute simple seta distally.

Distribution

Peraeospinosus pushkini so far has been found only at the Antarctic Peninsula at the depth range of 33–600 m ( Figure 25 ).

Remarks

Peraeospinosus pushkini is the only member of the genus which has a two-articled endopod of the uropod.

Figures

Figure 9. Peraeospinosus pushkini (Tzareva, 1982), female. (A) Dorsal view; (B) lateral view; (C) cephalon ventral view; (D) pleopod. Scale bars: 1.0 mm (A, B); 0.1 mm (C, D).

Figure 10. Peraeospinosus pushkini (Tzareva, 1982), female. (A) Antennule; (B) antenna; (C) labrum; (D, E) mandibles left and right, respectively; (F) maxillule; (G) maxilla; (H) maxilliped; (I) labium; (J) cheliped. Scale bars: 0.1 mm.

Figure 11. Peraeospinosus pushkini (Tzareva, 1982), female. (A–F) Pereopods 1–6, respectively; (G) uropod. Scale bars: 0.1 mm.

Figure 19. Peraeospinosus peculiaroides n. sp., holotype female (ZMUC CRU-3885). (A) Female dorsal view; (B) left mandible; (C, D) pereopod 5 and 6, respectively. Scale bars: 1.0 mm (A); 0.1 mm (B–D).

Figure 25. Distribution of genus Peraeospinosus based on Beddard (1886a, 1886b), Kudinova-Pasternak (1966, 1969, 1990), Lang (1968), and Shiino (1978).