Leptychaster kerguelenensis Smith 1876, Smith, 1876

Romanelli, Mariela V. & Tablado, Alejandro, 2011, Leptychaster kerguelenensis (Echinodermata: Asteroidea) from Southwest Atlantic: Redescription and geographic distribution, Zootaxa 2971, pp. 59-68: 64-66

publication ID

http://doi.org/ 10.5281/zenodo.201534

DOI

http://doi.org/10.5281/zenodo.5631985

persistent identifier

http://treatment.plazi.org/id/C00387BF-0F73-FFF3-FCC1-FF17FB60C7B0

treatment provided by

Plazi

scientific name

Leptychaster kerguelenensis Smith 1876
status

 

Leptychaster kerguelenensis Smith 1876  

Figures 3 View FIGURE 3 and 4 View FIGURE 4. a

Leptychaster kerguelenensis Smith 1876   , p. 110

Leptoptychaster kerguelenensis: Smith 1879   , p. 278, pl. 17, fig. 2 Leptoptychaster kerguelensis: Koehler 1917   , p. 52, pl. 6, figs. 1, 2, 7, 12 Leptoptychaster mendosus Koehler 1923   , p. 98, pl. 12, figs. 3–5 Leptychaster kerguelenensis mendosus: Fisher 1940   , p. 84.

Compressed disc; rays five (R:r from 2.0–5.0); width of arms do not decreases along them but it do rapidly at distal end, ending as blunt point; madreporite obscured by abactinal paxillae ( Fig. 3 View FIGURE 3 ).

Abactinal plates paxilliform, arranged irregularly, projecting proximal edges of plates lobed, reduced in size to the center of the disk and toward the midline of arms (near superomarginal plates from 2.3–2.7 mm size, carry 15– 33 spines from 0.1–0.2 mm long; center of disk and arms from 1.8 –2.0 mm size, carry 15–24 spines from 0.1–0.2 mm long) ( Fig. 4 a View FIGURE 4. a and b).

Superomarginal plates paxilliform, similar but larger than abactinals (from 2.9–3.2 mm size, carry 20–32 spines 0.1–0.2 mm long), and separates from inferomarginal ones by a well-defined groove ( Fig. 4 View FIGURE 4. a c). Inferomarginal plates tall, short, forming vertical edge of body; with prominent metapaxillar ridge raised transversally to the ambulacral groove (from 1.2–1.7 mm tall and from 0.3–0.5 mm wide) in middle of the ray, carry on top of the ridge 43–61 spines, 0.2–0.3 mm long, arranged irregularly ( Fig. 4 View FIGURE 4. a e). Slope of ridge carry small, thin and delicate hairlike spinules, parallel to base plate, and interlaced spinules forms fasciolar grooves between contiguous inferomarginal plates ( Fig. 4 View FIGURE 4. a f).

Small triangular actinal area with small paxilliform plates, arranged in a few rows from the mouth to distal end of arm (from 0.7–0.8 mm size, carry 12–22 spines 0.3–0.4 mm long). Only one row of actinal plates is present between furrow and margin in the most part of the arm ( Fig. 4 View FIGURE 4. a g). Adambulacral plates are widely spaced, consecutive plates being united by broad ligamentous bands. Each plate carry 6–10 spines, 2 furrow spines (from 1.3–1.4 mm long) and 4–8 subadambulacrals spines (from 0.9–1.2 mm long) ( Fig. 4 View FIGURE 4. a d). Oral plates elongate (from 2.9–3.3 mm long and 0.4–0.5 mm wide), 6–9 oral spines in each oral plate and 10–20 suboral spines (the oral ones are longer than the suboral) ( Fig. 4 View FIGURE 4. a h).

Distribution. Southern Indian Ocean platform (Subantarctic convergence) surrounding the Kerguelen and Marion islands, 55–182 m depth; Southwestern Atlantic platform between 48 ° to 55 ° S; from 86–152.5 m depth ( Fig. 5 View FIGURE 5 ).

Remarks. The above redescription is based on previous descriptions ( Sladen 1889, Koehler 1923) and the study of MACN-In specimens, with sizes ranging R from 12–66 mm and r from 2–16 mm.

Kingdom

Animalia

Phylum

Echinodermata

Class

Asteroidea

Order

Paxillosida

Family

Astropectinidae

Genus

Leptychaster

Loc

Leptychaster kerguelenensis Smith 1876

Romanelli, Mariela V. & Tablado, Alejandro 2011
2011
Loc

Leptychaster kerguelenensis mendosus:

Fisher 1940
1940
Loc

Leptoptychaster mendosus

Koehler 1923
1923
Loc

Leptoptychaster kerguelensis:

Koehler 1917
1917
Loc

Leptoptychaster kerguelenensis:

Smith 1879
1879
Loc

Leptychaster kerguelenensis

Smith 1876
1876