Moenocrinus deeckei

Moenocrinus deeckei
	Moenocrinus deeckei HILDEBRAND, 1926, Unterer Muschelkalk, Oberthulba, Museum Terra Triassica Euerdorf : A – A4: Krone, SMTE 5825 / 9-150; A1 and A2 view from the left, A3 and A4 view from the front. B: Columnale, B1, SMTE 5825-9-152A; B2, SMTE 5825-9-155; B3, SMTE 5825-9-152C; B4, SMTE 5825-9-152D; B5, SMTE 5825-9-152B; C: Moenocrinus bench , fracture surface with column and nodal, SMTE 5825-9-151.
Temporal occurrence
	Anisium ( Bithynium ), Triassic
Locations
	Urphar , Lower Muschelkalk ; Oberthulba , Lower Muschelkalk;
Systematics
Class :	Sea lilies and starfish (Crinoidea)
Subclass :	Articulata
Order :	Holocrinida
Family :	Holocrinidae
Genre :	Moenocrinus
Type :	Moenocrinus deeckei
Scientific name
	Moenocrinus deeckei
	Hildebrand , 1926

Moenocrinus deeckei Hildebrand 1926, is so far the only type of the tribe of echinoderms (Echinodermata Bruguière 1791 [ex Klein , 1734]), and the class of Crinoids (Crinoidea Miller , 1821) belonging to the genus Moenocrinus Hildebrand are, 1926. genus and species extinct and have so far only been found in Central Triassic marine deposits of the Central European Basin .

history

As part of the preparatory work for his dissertation in 1924 at the Albert-Ludwigs-Universität Freiburg on the geology and morphology of the area around Wertheim am Main , Erich Hildebrand succeeded in finding numerous crinoid goblets in geological surveys in the Triassic of the area around Wertheim in the Lower Muschelkalk their structure differed significantly from that previously known from shell limestone and prompted him to establish a new genus and a new species in 1924 . He named the genus Moenocrinus in honor of the location Urphar am Main (moenus fluvius) and the species in honor of his teacher Wilhelm Deecke as Moenocrinus deeckei . Since Hildebrand only wanted the first description in his publication in 1924 to be an announcement and, from his point of view, he had only described an abnormally developed crown, he described the sea lily again in 1926 and showed the ideal-typical normal development of this sea lily in writing and in a schematic representation. Unfortunately, he did not provide any information about the future whereabouts of the material he had found and some of which were described.

description

Moenocrinus deeckei Hildebrand , 1926 belongs to the cirrus-bearing sea lilies. The calyx, which has 15 single-line arms, is constricted above the radial, the infrabasalia is visible from the outside and the basalia is more than three times as long as the stem is wide. The left arm of the first division, seen from the outside, divides again after two limbs.

The shape of the stem links is pentagonal or rounded on five sides. The cirrus carrier carries 5 cirrus. The Hildebrand initially opposed to the species of the same family of Holocrinidae Jaekel , 1918, belonging to the genus Holocrinus (eg Holocrinus wagneri ( Benecke , 1887)) with long, tendril-like cirrus clouds in Moenocrinus deeckei as characteristic exposed feature of short, thick cirrus, nestled up against the stem, he later put into perspective himself and suspected the presence of different ages.

Information on the initial description

Hildebrand did not establish a holotype. If the original material is found, an example corresponding to Ill. HILDEBRAND 1926, plate 20, FIG. 6 or FIG. 7 could be identified as a lectotype.

1924 - Moenocrinus Deeckei ngn sp. - HILDEBRAND, p. 47, (Fig. 7 abnormal)
* 1926 - Moenocrinus deeckei - HILDEBRAND, 1926 (a), p. 274, plate 20, fig. 1 to 7), 1926 (b), p. 142

Stratum typicum: Lower Muschelkalk, according to an estimate by Erich Hildebrand about 5 m above the upper wave dolomite boundary (the red sandstone / muschelkalk boundary was not exposed in the small quarry in the Höhefelder Lücke in Urphar)
Locus typicus: Höhefelder gap above Urphar, lowest break
Collection: Hildebrand. The whereabouts of the original material is unknown.

Oberthulba site

Fund layer: Lower Muschelkalk, Jena Formation, cycle mu1e (cycle sequence 5), about 15.5 m above the upper edge of the border yellow limestone
Location: Quarry Albert & Hochrein GmbH, Höhfeldsberg, Oberthulba
Collection: Museum Terra Triassica Euerdorf , collection number SMTE 5825 / 9-150

Life picture of Triassic sea lilies of the order Holocrinida, Museum Terra Triassica Euerdorf

Way of life

Moenocrinus deeckei was like all Holocriniden not grown fast as many other sea lilies (Encrinida) with an adhesive disc on the sea floor but could with their cirrus active underground or at byssustragenden mussels cling, however, solve the anchor again and their living place move independently again. According to Tomasz Baumiller and Hans Hagdorn (1995), the Holocrinids, like their descendants, the Isocrinids still living in the deep sea, had predetermined breaking points in their stems under the nodal links, at which the stalk could be thrown off in such a way that the animal with its terminal cirrus wreath came to rest could easily anchor again.

literature

Tomasz Baumiller & Hans Hagdorn: Taphonomy as a guide to functional morphology of Holocrinus, the first post-Paleozoic crinoid . In: Lethaia, 28 :, 1995, pp. 221-228
Hans Hagdorn: Triassic: the crucial period of post-Palaeozoic crinoid diversification . In: Swiss J. Palaeontol., 130, 2011, pp. 91-112
Erich Hildebrand: Geology and morphology of the area around Wertheim a. M. Henn, Freiburg i. Br. 1924
Erich Hildebrand: Moenocrinus Deeckei, a new genus of crinoids from the Franconian wavy limestone and its systematic position . In: N. Jb. Min., Beil.-Bd. 54, Stuttgart 1926, pp. 259–288, plate 20
Erich Hildebrand: Moenocrinus Deeckei, a new genus of crinoids from the Franconian wavy limestone and its systematic position . In: Paläontologische Zeitschrift, 8, 1926, pp. 140–142
Erich Hildebrand: On the stratigraphy of the shell limestone crinoids . In: Centralblatt für Mineralogie, Geologie und Palaeontologie, B, 1926, pp. 69–71
Erich Hildebrand: Contribution to the knowledge of the Franconian wave mountains . In: Centralblatt für Mineralogie, Geologie und Palaeontologie, B, 1927, pp. 171–193
Erich Hildebrand and Julius Pia : Two crinoid goblets from the aniseed level of the southern Alps . In: Paläontologische Zeitschrift, 11, 1929, pp. 129–140
Martin Schmidt : The living world of our triad . Hohenlohesche Buchhandlung Ferdinand Rau, Öhringen 1928, pp. 125–126

Remarks

↑ The life data of Erich Hildebrand could not yet be determined. In 1924 he was awarded a Dr. rer. nat. doctorate and was at least in October 1924 still at the Geological-Paleontological Institute of the University of Freiburg. In 1926 he was in Hanover and in 1929 in Wacholtzstrasse. 1 lives in Braunschweig. According to Bruno von Freyberg (1974) his full name was Erich Karl Hildebrand and came from Braunschweig. See: Bruno von Freyberg: The geological literature on Northeast Bavaria (1476-1965) Part II: Biographical Author Register, Geologica Bavarica 71, Bavarian Geological State Office 1974, p. 68. In 1931 he wrote for Otto Krone : Prehistory of the country Braunschweig. Appelhans, Braunschweig 1931, the " Geological Introduction ".

[1] The life data of Erich Hildebrand could not yet be determined. In 1924 he was awarded a Dr. rer. nat. doctorate and was at least in October 1924 still at the Geological-Paleontological Institute of the University of Freiburg. In 1926 he was in Hanover and in 1929 in Wacholtzstrasse. 1 lives in Braunschweig. According to Bruno von Freyberg (1974) his full name was Erich Karl Hildebrand and came from Braunschweig. See: Bruno von Freyberg: The geological literature on Northeast Bavaria (1476-1965) Part II: Biographical Author Register, Geologica Bavarica 71, Bavarian Geological State Office 1974, p. 68. In 1931 he wrote for Otto Krone : Prehistory of the country Braunschweig. Appelhans, Braunschweig 1931, the " Geological Introduction ".