Peraeospinosus subtigaleatus, Błażewicz-Paszkowycz, 2005

Błażewicz-Paszkowycz, Magdalena, 2005, Revision of the genus Peraeospinosus Sieg, 1986 (Crustacea: Peracarida: Tanaidacea), Journal of Natural History 39 (45), pp. 3847-3901 : 3890-3899

publication ID	https://doi.org/ 10.1080/00222930500450879
persistent identifier	https://treatment.plazi.org/id/03A787E0-FF89-FF8B-FE7B-FBACFB7946A7
treatment provided by	Felipe
scientific name	Peraeospinosus subtigaleatus
status	sp. nov.

Treatment

Peraeospinosus subtigaleatus View in CoL n. sp.

( Figures 20–23 View Figure 20 View Figure 21 View Figure 22 View Figure 23 )

Material examined

Holotype: non-ovigerous ♀, USNM 306708 View Materials , Eltanin 32, Sta. 1996, 72 ° 059– 72 ° 059S, 172 ° 089–172 ° 099E, depth 348–352 m. Paratypes: two non-ovigerous ♀♀, USNM 306707 View Materials , Eltanin 32, Sta. 1996, 72 ° 059– 72 ° 059S, 172 ° 089–172 ° 099E, depth 348–352 m; adult „, USNM 1082154 View Materials , body length 2.3 mm, Eltanin 32, Sta. 1996, 72 ° 059– 72 ° 059S, 172 ° 089– 172 ° 099E, depth 348–352 m; 14♀♀; 1♀ dissected on slides USNM 1082155 View Materials ; one adult „ dissected on slides , USNM 306708 View Materials , Eltanin 32, Sta. 1996, 72 ° 059– 72 ° 059S, 172 ° 089– 172 ° 099E, depth 348–352m; 3♀♀ , two mancas, USNM 306709 View Materials , Eltanin 32, Sta. 1996, 72 ° 059– 72 ° 059S, 172 ° 089–172 ° 099E, depth 348– 352m.

Diagnosis

Non-ovigerous female. Carapace narrow, 1.3 times as long as wide, truncated anteriorly. Pereonite 1 short (one-third length of carapace) and subequal to pereonite 6. Pereonites 2– 5 wider than long. Pleon subequal to carapace length. Pleotelson truncated posteriorly. Antennule article 3 two times as long as article 2. Antennule article 1 with row of six setae on inner margin. Labrum sparsely covered with needle-like setae. Lower margin of mandibule molar with few needle-like setae. Propodus of pereopod 2 length: width ratio about 5. Pereopods 4–6 with blunt and robust (well-calcified) combs of setae on merus and carpus. Pleopod endopod with one dorsal seta. Uropod rami equal.

Etymology Named for the relatively narrow carapace (Latin: subtilis + galeatus 5slender+helmeted).

Description

Female without oostegites, holotype, body length 4.1 mm ( Figure 20A, B View Figure 20 ).

Body. Body about seven times as long as wide.

Cephalothorax. Smooth, long (1.3 times as long as wide), rostrum distinctive, blunt.

Pereonites. Pereonites wider than long; pereonite 1 short (one-third length of carapace) and two-thirds length of pereonite 2. Pereonite 1 subequal to pereonite 6.

Pleon. All pleonites similar in size. Pleon only a little shorter than carapace. Pleotelson truncated posteriorly.

Antennule ( Figure 21A View Figure 21 ). Article 1 massive, less than twice length of articles 2 and 3 combined, with three groups of simple and pinnate setae on outer edge and row of six simple setae on inner margin; article 2 with simple seta distally, half as long as article 3; article 3 tipped with eight simple setae, one pinnate seta, and one aestethasc.

Antenna ( Figure 21B View Figure 21 ). Articles 1 and 3 subequal; article 2 a little longer than article 3, with short distal seta; article 4 twice as long as article 5, with three minute and one pinnate setae distally; article 5 with one simple seta distally; article 6 very short with six apical setae.

Mouthparts. Labrum ( Figure 21C View Figure 21 ) hood-shaped, covered by sparse, short needle-like setae. Mandible ( Figure 21D, E View Figure 21 ) typical for genus; robust, molar process well-developed with undulated margins, needle-like setae on lower margin sparsely distributed; incisor process well-calcified; lacinia mobilis strong and crenulated. Maxillule ( Figure 21F View Figure 21 ) endite longer than palp, with nine apical spiniform setae (two of them are fused together); palp with two pinnate setae (not illustrated). Maxilla ( Figure 21G View Figure 21 ) triangular, corners rounded.

Maxilliped ( Figure 21H View Figure 21 ). Basis fused in heart-shaped plate, with two plumose setae on distal margin; endite with numerous short setae on inner margins; distal margin with two flat setae (tubercles), one simple seta, and one rod-like seta; palp article 1 unarmed, article 2 wedge-shaped, with one small seta on outer margin and three setae on inner margin (simple, strongly pinnate and rod seta); article 3 trapezoidal, with four setae on inner margin (two simple, one serrated, and one rod seta); article 4 more slender than article 3, simple seta on outer margin and five serrated or simple terminal setae on inner margin.

Cheliped ( Figure 20C View Figure 20 ). Basis robust, slightly rounded distally; merus wedge-shaped with one rod seta ventrally; carpus with two setae on ventral margin and row of six minute setae on dorsal margin; propodus fixed finger (propodus projection) tipped with a strongly calcified, blunt spine, two to three strongly calcified teeth and three setae on dorsal margin, two setae on ventral margin; dactylus slightly curved, with minute seta on dorsal margin and two strong spiniform setae on ventral margin.

Pereopod 1 ( Figure 22A View Figure 22 ). Basis with six rod setae along article and one pinnate seta proximally; ischium with one seta; merus subequal to carpus, with two setae distally; carpus with two rod setae and two simple setae distally; merus and carpus combined longer than propodus; propodus with one simple and two rod setae distally, propodus length: width ratio 5.5; dactylus half as long as unguis, with one seta.

Pereopod 2 ( Figure 22B View Figure 22 ). Basis a little shorter than the rest of articles combined, with six rod setae along article and one pinnate seta proximally; ischium with one seta; merus subequal to carpus, with one tubercle and one seta distally; carpus with four blunt spiniform setae and one simple seta distally; merus and carpus with numerous well-calcified combs of setae; propodus length: width ratio 4.8; dactylus with one simple seta, unguis longer than dactylus.

Pereopod 3 ( Figure 22C View Figure 22 ). Similar to pereopod 2 but combs of setae on carpus strongly calcified; merus and carpus with two simple setae distally.

Pereopod 4 ( Figure 22D View Figure 22 ). Basis wide, twice as long as wide, with two pinnate setae distally, one pinnate seta proximally and four simple setae along article; ischium with two setae; merus a little longer than carpus, with strong spiniform seta ventrally, carpus with two distal hooks and one seta distally; ventral margin of basis, merus, and carpus covered by strong spines; propodus with pinnate seta in middle, two spiniform setae ventrally and long seta distally; dactylus tipped by a bifurcated unguis.

Pereopod 5 ( Figure 22E View Figure 22 ). Similar to pereopod 4.

Pereopod 6 ( Figure 22F View Figure 22 ). Similar to pereopod 5; basis unarmed; propodus with three terminal setae, shorter than dactylus.

Pleopods ( Figure 22G View Figure 22 ). All pleopods similar in structure; endopod with one plumose seta dorsally and 16 setae ventrally; exopod with 23 short simple setae on outer margin (length: width ratio of exopod 3.0; of endopod 3.0); proximal seta on exopod and endopod separated by gaps from the others.

Uropod ( Figure 22H View Figure 22 ). Both rami uni-articled; exopod subequal to endopod; exopod with one minute seta at the middle, tipped by strong and minute simple setae; endopod with two pinnate setae at the middle; with five terminal setae.

Male. Body length 2.32 mm ( Figures 23 View Figure 23 , 24 View Figure 24 ).

Body ( Figure 23D View Figure 23 ). Body of swimming type. Cephalothorax. Relatively long (little shorter than combined length of pereonites 1–5); clearly narrow proximal and wider distally.

Pereonites. Pereonites 1–3 shorter than pereonites 4–6; pereonite 6 rounded posteriorly.

Pleon. Pleon 0.8 times as long as total body length; pleotelson elongated, with welldeveloped caudal process.

Antennule ( Figure 23A View Figure 23 ). With seven articles; articles 1 and 2 relatively robust, subequal, with groups of simple setae; articles 3–5 narrow, article 6 as long as article 7; article 3 with two long simple setae; articles 4–6 with row of aesthetascs; article 7 with four simple apical setae and one aesthetasc.

Antenna ( Figure 23B View Figure 23 ). With seven articles; articles 2–4 subequal; article 3 with one distal seta, articles 5 and 6 subequal, article 7 one-third length of article 6; last three articles with simple distal setae.

Maxilliped ( Figure 23E View Figure 23 ). Basis fused, forming heart-shaped plate; endite lobe-shaped, with two simple setae and flat setae (tubercles). Palp article 1 unarmed, article 2 with two long setae on inner margin and one on outer margin, article 3 trapezoidal, with four elongate setae on inner margin; article 4 relatively slender, with six distal setae.

Cheliped ( Figure 23C View Figure 23 ). Basis unarmed, somewhat elongated and rounded distally; merus wedge-shaped, with two simple setae on ventral margin; carpus large, trapezoidal, with two setae on ventral margin; fixed finger tipped with large spiniform seta and one simple seta on ventral margin; row of 13 setae near insertion of dactylus; dactylus curved, with two spiniform setae on inner margin and proximal seta on inner side.

Pereopod 1 ( Figure 24A View Figure 24 ). Very long and slender (walking type); basis as long as ischium, merus, carpus and half of propodus combined, with some short setae; short ischium with one seta only; merus and carpus subequal; merus with two, carpus with five distal simple setae; propodus only a little shorter than merus and carpus combined, with three setae in distal part; dactylus elongated, about twice as long as unguis; dactylus and claw combined almost half as long as propodus.

Pereopod 2 ( Figure 24B View Figure 24 ). Similar to pereopod 1; some of setae on merus and carpus are modified to spiniform setae.

Pereopod 3 ( Figure 24C View Figure 24 ). Similar to pereopod 2; all setae on merus and carpus modified to spiniform setae.

Pereopod 4 ( Figure 24D View Figure 24 ). Similar to pereopod 3, but basis, merus, and carpus stouter; two setae on ischium; dactylus and unguis combined as long as three-quarters of propodus length.

Pereopod 5 ( Figure 24E View Figure 24 ). Similar to pereopod 4.

Pereopod 6 ( Figure 24F View Figure 24 ). Similar to pereopod 5 but ischium with only one seta.

Pleopods ( Figure 24G View Figure 24 ). All pleopods of similar structure; endopod with nine elongate plumose setae on outer margin, and single seta on inner margin; exopod with 16 plumose setae on outer margin.

Uropod ( Figure 23F View Figure 23 ). Exopod three-articled: first article short, second as long as third, tipped with two elongated and four short terminal setae; exopod two-articled, first article half length of the second, with one seta on outer margin, distal article tipped with one strong and one short simple seta.

Distribution

The new species is known only from the type locality ( Figure 25 View Figure 25 ).

Remarks

Peraeospinosus subtigaleatus n. sp. is distinguishable by its narrow carapace in the female (1.3 times as long as wide) and row of six simple setae on the inner margin of antennule article 1.