Monodechenella breviceps ( Mitchell 1918 )

Vanderlaan, Tegan A. & Ebach, Malte C., 2015, A review of the Carboniferous and Permian trilobites of Australia, Zootaxa 3926 (1), pp. 1-56 : 19-20

publication ID

https://doi.org/ 10.11646/zootaxa.3926.1.1

publication LSID

lsid:zoobank.org:pub:342DDB94-4739-464B-AF67-4B17C6EE35D7

DOI

https://doi.org/10.5281/zenodo.5623223

persistent identifier

https://treatment.plazi.org/id/1B76A233-D746-FFA9-A6C7-A7B267EC9BE1

treatment provided by

Plazi

scientific name

Monodechenella breviceps ( Mitchell 1918 )
status

 

Monodechenella breviceps ( Mitchell 1918)

Figs.. 4.7–4.9

1892a Phillipsia sp. indet.(b); Etheridge Jr., p. 129, pl. 22, fig. 14. 1918 Phillipsia dungogensis Mitchell ; p. 474, pl. 47, figs. 6–7.

1918 Phillipsia breviceps Mitchell ; p. 449, pl. 46, figs. 11–12, pl. 51, figs. 2–3. 1963 Conophillipisa brevicaudata Roberts; p. 25, pl. 6, figs. 13–20. 1965 P. cf. Phillipsia dungogensis ; Roberts, p. 56.

1965 Conophillipsia brevicaudata; Roberts, p. 57.

1967 Conophillipsia brevicaudata; Hahn & Hahn, p. 327, text-fig. 2e. 1969 Proetus (Pudoproetus) breviceps ; Hahn & Hahn, p. 60.

1970 Conophillipsia brevicaudata; Osmólska, p. 26, tab. 1.

1972 Phillipsia ? ( Phillipsia ?) dungogensis ; Hahn & Hahn, p. 392. 1972 Conophillipsia brevicaudata; Hahn & Hahn, p. 382.

1984 Conophillipsia breviceps breviceps Engel & Morris; p. 31–35, figs. 4–5. 1984 Conophillipsia breviceps dungogensis Engel & Morris; p. 35–36, figs. 6–7. 1994 Monodechenella breviceps ; Lieberman, p. 141–143.

Lectotype. AMF28383 (part external mould of cranidium).

Paralectotype material. Unknown locality: AMF28371 (internal pygidium). From NU L372: AMF35851a/b (external/internal pygidium).

Locality. Type—unknown. Others—NU L372.

Emended diagnosis. Cephalon flat with a semicircular outline; glabella tapers anteriorly; S1 very distinct, S2 faint. Anterior border concave, glabella just touches border furrow; genal spines short. Pygidial border concave; 11+ pleural ribs, 12+ axial rings.

Remarks. Engel & Morris (1984) separated Monodechenella breviceps into two sub-species based on the larger number of ribs and rings in M. breviceps dungogensis . However, there are few preserved cranidial features for this second sub-species, and the pygidia are almost identical. It is also apparent that not all rings in many of the M. breviceps breviceps specimens are preserved, so they may in fact consist of more. The specimens identified as M. breviceps dungogensis have therefore been synonymised with M. breviceps breviceps , removing the need for subspecies names. The pygidial axial ring and rib pair counts in the emended diagnosis has been changed to reflect this.

Kingdom

Animalia

Phylum

Arthropoda

Class

Trilobita

Order

Proetida

Family

Proetidae

Genus

Monodechenella

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