Arthrotelsonichnus CHIPLONKAR & GHARE, 1975

Type ichnospecies:
Arthrotelsonichnus namadicus CHIPLONKAR & GHARE, 1975

Diagnosis:
Bilaterally symmetrical depressions on bedding planes showing a division along the longitudinal axis into three parts: front, middle and rear, being broad, medium and narrow in width respectively (VALLON & RÖPER, 2006).

Derivation of name:
From Latin tres = three and pars = part; after the morphological division of the trace fossils into three parts.

Remarks:
None.

Environment:
Resting traces of arthropods that may occur in a variety of environmental settings. T. triassicus derives from fluvial deposits, perhaps with an occasional slightly brackish influence. T. imbergi occurs in the lagoons of the lithographic limestones around  Solnhofen, especially in the localities of Pfalzpaint that are interpreted as tidal canals connecting several lagoonal basins with each other (VALLON & RÖPER, 2006) and therefore fully marine.

Known Stratigraphic Range:
Lower Triassic – Upper Jurassic (VALLON & RÖPER, 2006)

Known ichnospecies:

• Tripartichnus triassicus VALLON & RÖPER, 2006
• Tripartichnus imbergi VALLON & RÖPER, 2006

Detailed information for each ichnospecies

• Tripartichnus triassicus VALLON & RÖPER, 2006
• Synonymy:
  

  *

  2006

  Tripartichnus triassicus

  - VALLON & RÖPER, p.157; Fig. 2; Fig. 3.

• Diagnosis: Tripartichnus in which the front and the middle parts are divided longitudinally; elongated and lanceolate at its rear.
• Orientation: Preserved as negative epichnion or positive hypichnion.
• Trace fossil type (Knaust 2012): Imprint.
• Ethological category: Cubichnia.
• Environment: Fluvial, perhaps slightly brackish in times.Derivation of name:
  After the Triassic system.
• Holotype: Deposited in the Staatliches Museum für Naturkunde Stuttgart, Germany; Inventary-No.: SMNS 64849/1.
• Paratypes: Deposited in the Staatliches Museum für Naturkunde Stuttgart, Germany; Inventary-No.: SMNS 64849/2 to SMNS 64849/11.
• Type locality: Former building site in Keltern-Dietlingen, Germany (address: Felix-Wankel-Straße 6, D-75210 Keltern-Dietlingen; GPS: 48°53'26"N 8°37'03"E).
• Type horizon: Lower Triassic, Upper Buntsandstein, Plattensandstein, Rö-Folge.
• Occurrence: Only known from the type locality.
• Remarks: As tracemaker of T. triassicus was Euthicarcinus sp. identified with high probability.

• Tripartichnus imbergi VALLON & RÖPER, 2006
• Synonymy:
  

  ?	1969	Körperabdrüucke von  Crustaceen	- JANICKE, p. 164; Pl. 9 Fig. 1.
  	1999	Hörnergrabgänge	- RÖPER et al., p. 16; Fig. 11, Fig. 12.
  *	2006	Tripartichnus triassicus	- VALLON & RÖPER, p.157; Fig. 2; Fig. 3.

• Diagnosis: Tripartichnus is preserved as a negative epirelief. It consists of a front part bearing two lengthwise orientated ovals and two antenna-like extensions, a middle rounded triangular part, and a rear rectangular part.
• Orientation: Preserved usually as negative epichnion, but also as positive hypichnion.
• Trace fossil type (Knaust 2012): Imprint.
• Ethological category: Cubichnia.
• Environment: Fully marine or marginal marine.Derivation of name:
  After Theodor Imberg, founder of the Natursteinwerke Imberg (Bochum, Dortmund, Pfalzpaint, Munich).
• Holotype: Deposited in the Bürgermeister-Müller-Museum Solnhofen, Germany; Inventary-No.: BMMS 537.
• Paratypes: Deposited in the Bürgermeister-Müller-Museum Solnhofen, Germany; Inventary-No.: BMMS 701 to BMMS 703.
• Type locality: Imberg Quarry between the villages Pfalzpaint, Gungolding and Walting, Germany; GPS: 48°54'46"N 11°19'39"E).
• Type horizon: Lithographic limestones of Pfalzpaint (Solnhofen Formation; Early Tithonian, hybonotum Zone, rueppellianum Subzone).
• Occurrence: Schrimmel Quarry near Walting (N 48°54’44’’, E 011°19’18’’); Imberg quarry near  Pfalzpaint; and others.
• Remarks: As tracemaker of T. imbergi was Palinurina sp. identified with high probability.

Similar ichnogenera (Please allow for pop-up windows!):

• Craticulichnum