Trace-Fossil Systematics - Trace Fossils as Indicators of Sedimentary Environments - page 89

Uniserial

One track Two tracks One track Two tracks

1

Medial trail(s) optional
*Taxonomic status unclear

FIGURE 4 Morphological classification of trackways made by invertebrates. See text for details
and Lists 5 and 8 for complete lists of valid and invalid ichnogenera, including references (Supple-
mentary Material: http://booksite.elsevier.com/9780444538130 ) .

Imprints

Avolatichnium
Rotterodichnium
Radichnus
Stiallia
Striatichnium

Circular,
subcircular

* Medusinites
Rotamedusa

Linear, curved
striations

Kingella
Musculopodus
Naviculichnium
Solusichnium
Surculichnus

Ellipsoidal,
ovoid

Biserial
striations

Arborichnus
Ramosichnus

Cone-shaped,
multisegmented

Pollichianum
Tonganoxichnus

Hook-shaped,
sinuous

Ophioichnus
Zhadaichnus

Tripartite, variably
segmented

Craticulichnum
Tripartichnus

Elongated,
linear, tortious

Tortilichnus

T-shaped Limulicubichnus

Selenichnites

Monofungites

Lunate

Dumb-bell-
shaped

Arthraria

Bilobate

Gluckstadtella

Asteriacites

Star-shaped

Irregular Orbiculichnus

Asterichnites
Ichnocumulus

*Taxonomic status unclear
Ichnotaxa in blue font may also occur as burrows

Radiating

FIGURE 5 Morphological classification of imprints made by invertebrates. See text for details and
Lists 6 and 8 for complete lists of valid and invalid ichnogenera, including references (Supplemen-