Collettea alicjae, Blażewicz-Paszkowycz, Magdalena & Larsen, Kim, 2005

Blażewicz-Paszkowycz, Magdalena & Larsen, Kim, 2005, New species of the genus Collettea Lang, 1973 (Peracarida: Tanaidacea, Colletteidae) from the Antarctic., Zootaxa 1085, pp. 1-19 : 4-8

publication ID	https://doi.org/ 10.5281/zenodo.170459
DOI	https://doi.org/10.5281/zenodo.6267795
persistent identifier	https://treatment.plazi.org/id/E93D87E7-9340-F64B-4324-FC69FBBEFB47
treatment provided by	Plazi
scientific name	Collettea alicjae
status	sp. nov.

Treatment

Collettea alicjae View in CoL n. sp. ( Figs. 1 View FIGURE 1 , 2 View FIGURE 2 )

Diagnosis, Female. Pereonites 1–3 subequal length. Pereonite 6 only twothirds as long as pereonite 5. Pleon shorter than pereon. Pleonites short, less than half as long as wide. Antenna article 4 without fusion line. Maxilliped endite each with one tuberculous process. Cheliped fixed finger with nine small but clearly defined pointed denticles. Cheliped dactylus not longer than fixed finger. Uropods short but with protruding apex of pleotelson; endopod biarticulated.

Male. Unknown.

Material examined. Nonovigerous female holotype ( USNM 1078734), body length 2.5 mm: Eltanin Cr. 38, Sta. 11/32, 49°45.57'S, 152°36.18'W, depth 4304 m, 30 Apr 1969. Paratypes: 1 nonovigerous female, dissected; 1 manca III, ( USNM 1078735) same locality and depth; 1 female ( USNM 1078736): Eltanin Cr. 38, Sta. 11/33, 49°45.57'S, 152°36.18'W, 4303 m, 1 May 1969; 1 female ( USNM 1078737): Eltanin Cr. 38, Sta. 7/5, 64°13.05'S, 150°06.67'E, depth 3543 m, 30 Mar 1969; 1 specimen half ( USNM 1078738): Eltanin Cr. 38, Sta. 7/2, 64°13.05'S, 150°06.67'E, depth 3543 m, 29 Mar 1969; 1 female ( ZMH K 40910): Polarstern Cr. PS61/1313, 65°19,83' 65°19,95' S, 51°31,62' 51°31,41' W, depth 30493050 m, 5 Mar 2002.

Etymology. Named in honor of our colleague and friend Dr. Alicja Konopacka.

Description. Adult female. Body nine times as long as broad ( Figs. 1 View FIGURE 1 A, 1B). Cephalothorax as long as combined length of pereonites 13. Pereonites 13 subequal. Eye lobes present but without visual pigment. Pereonites all wider than long. Pereonite 5 longest. Pleon long, about 40% of total body length. All pleonites subequal, without pleopods. Pleotelson longer than combined length of three pleonites.

Antennule ( Fig. 1 View FIGURE 1 C). With five articles. Shorter than cephalothorax. Article 1 shorter than rest of antennule combined, with one distal seta. Article 2 shorter than article 4, with two simple distal setae. Article 3 shorter than article 2, with two simple distal setae. Article 4 length less than half the length of article 1, with four simple and one setulate distal setae. Article 5 minute and partly obscured under extension of article 4, with 1 simple seta.

Antenna ( Fig. 1 View FIGURE 1 D). Fourfifth length of antennule, with six articles. Article 1 fused to body, naked. Article 2 longer than article 3, with one robust distal seta. Article 3 with one robust distal seta. Article 4 as long as articles 2, 3 and 5 combined, with two simple and two setulate distal setae, no trace of fusion line. Article 5 as long as article 2, with one distal simple seta. Article 6 minute, with five distal setae.

Mouthparts. Labrum ( Fig. 1 View FIGURE 1 E) rounded and setulose. Mandible molar process longer than incisor and relatively broad, distal part with few tubercles and group of small spines. Left mandible ( Fig. 1 View FIGURE 1 F) lacinia mobilis pointed, shorter than incisor, with three denticles on outer margin; incisor with two blunt denticles. Right mandible ( Fig. 1 View FIGURE 1 G) incisor with three denticles. Maxillule ( Fig. 1 View FIGURE 1 H) endite with nine distal spiniform setae. Palp not recovered. Maxilla not recovered. Maxilliped ( Fig. 1 View FIGURE 1 I) basis wider than endite, rectangular. Each endite with two subdistal setae and one distal tubercular process. Palp article 1 smooth; article 2 with three inner setae and one small outer seta; article 3 with four inner setae; article 4 with four inner and one outer setae. Epignath ( Fig. 1 View FIGURE 1 J) shorter than maxillule endite, smooth.

Cheliped ( Fig. 2 View FIGURE 2 A). Basis divided unequally by sclerite attached distally, shorter than carpus, naked. Merus with one ventral seta. Carpus shorter than propodus including fixed finger, with two ventral and two dorsal setae. Propodus naked. Fixed finger with two ventral and three inner setae, with nine small but clearly defined pointed denticles on inner margin. Dactylus as long as fixed finger, with two small ventral setae.

Pereopod 1 ( Fig. 2 View FIGURE 2 B). Coxa with one seta. Basis as long as combined length of ischium, merus, carpus, and half of propodus, naked. Ischium naked. Merus shorter than carpus, widening distally, with one small spiniform ventrodistal seta. Carpus threequarters the length of propodus, with three spiniform distal setae. Propodus half as long as basis, with four spiniform subdistal setae and dorsal spine. Dactylus and unguis of subequal length and combined as long as propodus.

Pereopod 2 ( Fig. 2 View FIGURE 2 C). As pereopod 1 except: propodus with one ventral serrated and one spiniform dorsal seta and dorsal spine. Dactylus naked.

Pereopod 3 ( Fig. 2 View FIGURE 2 D) (described from holotype). As pereopod 2 except: merus with one serrated spiniform seta. Carpus with one small and two serrated spiniform setae. Propodus with one spiniform ventral seta and several small dorsodistal spines.

Pereopod 4 ( Fig. 2 View FIGURE 2 E). Coxa naked. Basis as long as combined length of ischium, merus, carpus, and half of propodus, naked. Ischium with one seta. Merus shorter than carpus, with two serrated setae. Carpus with four serrated spiniform and one small simple setae. Propodus with two spiniform ventrodistal setae and dorsal spine. Dactylus and unguis combined longer than propodus. Dactylus shorter than unguis, with small distal spines at unguis insertion.

Pereopod 5 ( Fig. 2 View FIGURE 2 F). As pereopod 4, except ischium naked. Merus with two serrated spiniform setae. Carpus with four serrated spiniform setae. Propodus with one ventral serrated spiniform distal seta. Dactylus and unguis combined longer than propodus. Dactylus longer than unguis, with small distal spines at unguis insertion.

Pereopod 6 ( Fig. 2 View FIGURE 2 G). As pereopod 5, except basis with two setulose setae. Ischium with one seta. Carpus with two simple and two serrated spiniform setae. Propodus with one small spiniform and two serrated spiniform distal setae.

Pleopods. No pleopods on female.

Uropods ( Fig. 2 View FIGURE 2 H). Short (just protruding apex of pleotelson). Protopod as long as endopod first article, naked. Endopod with two articles; article 1 naked; article 2 with four long simple and two small setulate distal setae. Exopod about half as long as endopod first article distally, with one small simple and one long seta.

Distribution. Pacific sector of Southern Ocean, north from Ross Sea at the depth range 3543–4303m and northwestern part of Weddell Sea, in eastern direction from tip of Antarctic Penninsula, at the depth range 3049–3050 m.

Remarks. Collettea alicjae n. sp. is characterized by the combination of a pleon being shorter than pereon and subequal length of pereonites 1–3. Those two characters are sufficient to distinguish C. alicjae from the others members of the genus.

The distribution of the C. alicjae in the Southern Pacific and in the Weddell Sea is puzzling. However, we located no differences between the specimens from the two localities and have there therefore decided to classify them as one species.