Feracrinus heinzelleri Eléaume, Bohn, Roux & Améziane, 2012, n. sp.

• Main Authors: Eléaume, Marc, Bohn, Jens-Michael, Roux, Michel, Améziane, Nadia
• Format: Other/Unknown Material
• Language: unknown
• Published: 2012
• Subjects: Biodiversity; Taxonomy; Animalia; Echinodermata; Crinoidea; Hyocrinida; Hyocrinidae; Feracrinus; Feracrinus heinzelleri; Queen Maud Land
• Online Access: https://zenodo.org/record/6180833; https://doi.org/10.5281/zenodo.6180833

Feracrinus heinzelleri n. sp. Figures 4–6. Etymology. This new species is dedicated to Professor T. Heinzeller Ludwig-Maximilian-University, Munich (Germany), who has contributed substantially to our understanding of crinoid anatomy. Material examined. Holotype (catalogue number ZSM 0000/ 1) and one paratype (catalogue number ZSM 0000/ 2) R/V Polarstern cruise ANT IX/ 3, station 18 / 192, 27.02. 1991, off Queen Maud Land, 69 ° 40.3 ’ to 69 ° 40.5 ’ S –00° 51.1 ’ to 00° 54.8 ’ E, 1393–1398 m, housed in the Bavarian State Museum Collection of Zoology (ZSM) in Munich. Diagnosis. A small species with robust arms of proximal pattern 1 + 2 3 4 5 + 6 7 + 8 or 5 + 6 7; beyond Br 6 series of successive brachial pairs (a+b c+d e+f…) or brachial pairs alternating with free brachials (a+b c d+e f.); series of up to 4 successive muscular articulations. Pinnules relatively robust and rigid; insertion deep, carved on arm side and impacting the following brachial pair; synarthrial articulation on brachial with strong symmorphy; concave cover plates varying from lanceolate to rounded; genital pinnules with one row of additional H-shaped plates. Ratio of primibrachial width to upper radial height 0.73 to 0.85. Tegmen with oral cone higher than anal cone; orals large and erect around mouth; anal cone conspicuous in C–D inter-ray and bearing large bulging plates. Conical dorsal cup with ratio of cup height to upper diameter 1 to1.3; basals fused; radials trapezoidal. Columnal symplexies with 8 crenular units; distal syzygies unknown. Description of the holotype. Specimen consisting of proximalmost stalk, theca and partly broken crown (Fig. 4 A). Tegmen heavily plated and not inflated; tegminal plates of variable shape, some perforated by hydropores; anal cone height 2.8 mm, covered by relatively large bulging plates and conspicuous in C–D inter-ray (Fig. 4 B); oral cone height 3.6 mm with conspicuous, convex and smooth orals surrounding beak-like mouth (Fig. 4 C); ambulacral grooves merging into arms at height of Br 4. Aboral cup ...