Taxonomy and ontogeny of the Lituitida (Cephalopoda) from Orthoceratite Limestone erratics (Middle Ordovician) Author Aubrechtová, Martina CAF4231-8787-4051-8D76-F983332517EE Institute of Geology and Palaeontology, Faculty of Science, Charles University Prague, Albertov 6, Prague, 12843, Czech Republic. & Institute of Geology, Czech Academy of Sciences, Rozvojová 269, Prague, 16500, Czech Republic. aubrech1@natur.cuni.cz,aubrechtova@gli.cas.cz Author Korn, Dieter 286CA4F3-7EBC-4AEF-A66A-B2508D001367 Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Invalidenstrasse 43, 10115 Berlin, Germany. dieter.korn@mfn.berlin text European Journal of Taxonomy 2022 2022-03-08 799 1 1 108 http://dx.doi.org/10.5852/ejt.2022.799.1681 journal article 20271 10.5852/ejt.2022.799.1681 f53d5465-7162-45d6-892b-dfc0b8d99789 2118-9773 6341270 F52DBAB0-38C7-400F-9BA1-E2D8E6B19E7E Lituites cf. lituus de Montfort, 1808 Figs 33C , 36 , Tables 9–10 Material examined POLAND • 2 specs ; West Pomerania , Island of Chrząszczewska (former Gristow); Ordovician , Upper Grey Orthoceratite Limestone ; Müchner Coll.; MB.C.30529 , MB.C.30530 . SWEDEN • 1 spec. ; Island of Öland , Island of Öland ; Ordovician ; Technische Universität Berlin Coll.; MB .C.30531 . COUNTRY UNKNOWN • 1 spec. ; Ordovician ; MB.C.11650 . Description Specimen MB.C.30529 ( Fig. 33C ) consists of the coiled part (2.25 tightly coiled volutions; dm = 27 mm ; WER 2.3; Fig. 36A–E ) and the weakly curved backcoiled part (length = 102 mm ; wh = 18 mm ; EA ~5°). The initial chamber of the phragmocone is cup-shaped and small (whorl height ca 1.4 mm ). The initial ca 4 mm of conch length is ornamented by fine growth lines ( 0.1–0.2 mm apart); after that pairs of raised lirae appear (up to 0.7 mm apart) with extremely fine growth lines in between them. From about the beginning of the second whorl, a weak lateral sinus is developed. The ornament of the rest of the coiled and backcoiled part of the conch consists of biconvex lirae and flat ribs. The ribs are barely discernible in the second half of the specimen and only coarse lirae are visible ( 1.3 mm apart). Lateral sinus is either very shallow or the ornament elements are straight, ventral sinus is deep and rounded, dorsal projection and dorsolateral sinuses are not developed. At the end of the specimen, only lirae ( 1 mm apart) are present. Table 10. Conch measurements (in mm), and expansion rates of uncoiled conch parts of Lituites Bertrand, 1763 .

taxon	catalogue nr	max. wh	max. ww	min. wh	min. ww	fragm. length	EA (°)
L. lituus	MB.C.2497	25.4	24.0	12.3	9.8	156.3	4.8
L. lituus	MB.C.11990	25.0	–	11.4	–	146.9	5.3
L. lituus	MB.C.29650	35.8	–	25.8	24.4	88.0	6.5
L. lituus	MB.C.30527	32.0	32.0	10.5	9.4	195.3	6.3
L. lituus	MB.C.30528	45.0	–	35.0	–	127.2	4.5
L. lituus	ZPAL N/851	30.8	–	8.7	–	210.8	6.0
L. cf. lituus	MB.C.30529	18.3	18.0	9.8	8.0	99.3	4.9
L. cf. lituus	MB.C.30530	13.0	–	9.0	7.3	41.6	5.5
L. toernquisti	MB.C.30532	12.0	–	9.6	7.8	25.4	5.4
L. toernquisti	MB.C.30533	10.0	8.5	7.2	6.3	43.3	3.7
L. toernquisti	MB.C.30534	13.0	–	8.0	–	54.0	5.3
L. toernquisti	MB.C.30535	15.6	15.0	7.7	–	83.7	5.4
L. baculus	MB.C.29654	15.6	–	8.1	–	97.6	4.4
L. bottkei	MB.C.29651	41.9	–	9.7	–	287.9	6.4
L. bottkei	MB.C.30536	36.0	–	19.5	–	134.9	7.0
L. cf. bottkei	MB.T.4492.52	40.0	38.0	28.0	–	109.0	6.3
L. clavis	MB.C.30537	16.0	15.6	12.0	–	109.1	2.1
L. dewitzi	MB.C.30538	14.1	–	9.1	–	60.9	4.7
L. kruegeri	MB.C.30539	11.0	10.4	10.8	9.3	12.7	0.9
L. lasaulxii	MB.C.11678	18.4	–	10.4	–	81.8	5.6
L. lasaulxii	MB.C.11645	16.2	–	10.0	–	64.5	5.5
L. cf. lasaulxii	MB.C.11677	24.0	–	19.0	–	75.4	3.8
L. nebeni	MB.C.30541	12.7	12.3	8.6	7.3	61.8	3.8
L. perfectus	MB.C.30544	11.4	10.2	11.3	9.7	10.0	0.8
L. perfectus	MB.C.30542	11.0	10.3	9.0	229.2	0.5
L. perfectus	MB.C.30543	15.2	13.7	10.9	9.6	82.1	3.0
L. procerus	MB.C.2498	9.8	–	9.7	–	19.1	0.3
L. procerus	MB.C.30546	10.0	9.0	8.7	–	49.6	1.5
L. procerus	MB.C.30547	12.8	–	10.6	–	25.7	4.9
L. tenuicaulis	MB.C.5389	12.4	–	10.3	–	44.5	2.7
L. tenuicaulis	MB.C.30550	11.7	–	10.2	–	34.4	2.5
L. sp.	MB.C.11673.2	19.2	19.0	14.0	–	59.5	5.0
L. sp.	MB.C.29649	20.7	–	10.1	–	77.7	7.8
L. sp.	MB.C.11628	47.4	–	22.7	22.2	204.8	6.9
L. sp.	MB.C.11653	11.1	–	10.1	–	28.6	2.0
L. sp.	MB.C.30572	11.9	–	9.7	–	42.0	3.0
L. sp.	MB.C.30576	11.8	11.0	9.1	7.4	44.2	3.5
L. sp.	MB.C.29648	16.6	–	10.0	–	63.0	6.0
L. sp.	MB.C.30569	21.4	21.4	10.6	9.2	103.0	6.0
L. sp.	MB.C.9706	37.0	–	29.0	–	86.4	5.3
L. sp.	MB.C.30575	12.4	12.0	10.0	8.3	43.0	3.2
L. sp.	MB.C.30568	19.0	–	12.7	11.0	52.2	6.9

Remarks The specimens resemble Lituites lituus in their overall dimensions, but the backcoiled part in specimens MB.C.30529, MB.C.30530 ( Fig. 36F–J ) and MB.C.30531 is only weakly curved and the shell ornament is slightly finer. Specimen MB.C.30529 differs with its biconvex lirae and flat ribs on the shell surface. Specimen MB.C.11650 is a fragmentary and slightly deformed body chamber, which has a finer shell ornament; the ornament elements form a flatter lateral sinus compared to L. lituus .