Pancolini Sieg, 1980

Esquete, Patricia, Bamber, Roger & Aldea, Cristian, 2012, On some shallow-water Tanaidomorpha (Crustacea: Peracarida: Tanaidacea) of Chilean fjords, with description of a new species of Zeuxoides Sieg, 1980, Zootaxa 3257, pp. 38-55 : 45-46

Tribe Pancolini Sieg, 1980

Genus Pancoloides Sieg, 1980 Pancoloides cf. litoralis ( Vanhöffen 1914) Figs 5–8

Tanais litoralis Vanhöffen, 1914 , pp. 465-467, fig. 5 Tanais littoralis Monod, 1926 , p. 12

Tanais litoralis Nordenstam, 1930 , p. 259 Tanais litoralis Dudich, 1931 , p. 142

Tanais novae-zelandiae Monod, 1931, p. 11 Anatanais litoralis Stephensen, 1936 , p. 371

Tanais litoralis Hale, 1937 , p. 10

Anatanais litoralis Larwood, 1954 , p. 34

Pancoloides litoralis Sieg, 1980a , pp. 134-140, figs. 36-37.

Material examined: 1male, 3 preparatory females, 6 neuters, 51º31.79ʹS 73º57.95ʹW, red algae, 5–15 m, 26 January 2010; 2 preparatory females, 51º09.51ʹS 73º42.62ʹW, red algae, 5–15 m, 27 January 2010. All coll. M. Palacios, C. Cárdenas, A. Montiel, M. Hune and C. Aldea.

Chilean material is drawn herein in some detail to complement the descriptions of Vanhöffen (1914) and Sieg (1980a). Morphological differences with these previous descriptions are discussed.

Diagnosis: With characteristics of the genus. Dorsal surface showing brown pigmentation. Second article of antenna ( Fig 5 C) about twice as long as broad in male. Left mandible ( Fig. 6 A) with bifid, setulose spine. Male cheliped ( Fig. 5 B) very large, with elongate fixed finger, strongly curved. Pleopods 1 ( Fig. 7 F) and 2 similar; basal article with five plumose setae on outer margin and one on inner margin. Pleopod 3 ( Fig. 7 G) with reduced setation; basal article with only one seta on outer margin. Uropods ( Fig. 7 H) of four articles, distal article minute.

Remarks: Pancoloides litoralis is a littoral to shallow-water species widely distributed in cold regions of the Southern Hemisphere ( Sieg, 1980a, 1986a); it has been recorded from the Kerguelen Islands ( VanHöffen, 1914), Campbell Island, New Zealand ( Monod, 1931), and Macquarie Island, Australia ( Hale, 1937) and the Magellanic region ( Sieg, 1986a). It mainly occurs in intertidal waters, in rocky intertidal pools and Macrocystis holdfasts. In South America, its distribution was restricted to Tierra de Fuego ( Sieg, 1986a); this record extends its distribution northwards.

Pancoloides litoralis was first described by Vanhöffen (1914) as Tanais litoralis . Later, Sieg (1980a) moved it to his new genus Pancoloides , supplying the first complete description of the species. Morphological differences with previous descriptions shown by the present material include: the number of aesthetascs in the male: our specimens have five aesthetascs ( Fig. 5 C), while Sieg (loc. cit.) figured three (although this number is not specified in the text). In Sieg’s description the right mandible shows two plumose spines, while we observed only one in our specimens ( Fig. 6 A). The distal article of the maxilliped ( Fig. 6 E) is 1.8 times as long as broad, while Sieg described it as three times as long as broad. The merus, carpus and propodus of pereopods 2 and 3 ( Fig. 7 B, C) are proportionally stouter in our specimens (1.7, 1.4 and 2.5 times as long as broad, respectively) than in Sieg’s description (3, 2 and 4 times as long as broad, respectively); the merus of each of these pereopods bears three ventrodistal spines, not mentioned by Sieg (although he figured at least two). Similarly, the merus, and propodus of pereopods 4 to 6 ( Fig. 7 D, E) are proportionally stouter and shorter in our specimens (about 2.2 and 2.5 times as long as broad, respectively; merus about as long as carpus) than in Sieg’s description (3.5 and 2.5 times as long as broad, respectively; merus about 1.5 times as long as carpus).

Figures

FIGURE 5. Pancoloides litoralis, male: A, habitus, dorsal. B, cheliped. C, antennule. D, antenna.

FIGURE 6. Pancoloides litoralis: A, right mandible. B, left mandible. C, labium. D, maxillule. E, maxilliped. F, maxilliped endite. G, epignath.

FIGURE 7. Pancoloides litoralis: A-D, pereopods 1 – 4 respectively. E, pereopod 6. F, pleopod 1. G, pleopod 3. H, uropod.

FIGURE 8. Pancoloides litoralis, female: A, habitus, dorsal. B, cheliped. C, antennule. D, antenna.