Pechoracaris, 2004
|
publication ID |
https://doi.org/ 10.1111/j.1096-3642.2004.00121.x |
|
DOI |
https://doi.org/10.5281/zenodo.5700759 |
|
persistent identifier |
https://treatment.plazi.org/id/03DFC827-FFE4-FFC1-FF20-F083FEDAFE2B |
|
treatment provided by |
Carolina |
|
scientific name |
Pechoracaris |
| status |
sp. nov. |
PECHORACARIS ACULICAUDA SP. NOV.
( FIGS 1 View Figure 1 , 5 A View Figure 5 )
Holotype: PIN 4983/21b ( Fig. 1D View Figure 1 )
Type horizon and locality: Dark-grey claystone from between 4255.0 and 4262.7 m, Early Devonian (Lochkovian?). Borehole Medynskoye 1 in the Timan-Pechora region of polar Russia.
Material: Thirty relatively complete specimens and many more fragments.
Diagnosis: As for the genus.
Etymology: Derived from Latin acus (needle) and cauda (tail), referring to the form of the telson.
Material: Sixty relatively well preserved specimens, mostly with abdomen.
Description: The carapace lacks any hinge or separate dorsal plates, as visible in slightly obliquely compressed specimens. The lower margin frequently shows a narrow strengthening belt, probably a little thicker than the rest of the cuticle, perhaps representing a doublure. In specimens PIN 4983/20 and 4983/7, minute sparsely distributed denticles are recognizable near the posterior end of the carapace at its margin. Two somewhat more prominent spines arm the ventro-posterior lobe of the carapace in PIN 4983/1d. The anterior end of the carapace narrows parabolically and is a little pointed, as shown by PIN 4983/8a. The carapace length in the studied material ranges from 2.5 mm to 4.7 mm ( Fig. 1B View Figure 1 ). In most specimens dark crushed mandibles are visible across the compressed carapace near its anterior end ( Fig. 1F View Figure 1 ). Appendages of the abdomen are transformed into paired sharp spines ( Fig. 1D View Figure 1 ), somewhat longer than their segments. The caudal spine is definitely much longer than the carapace ( Fig. 1E View Figure 1 ) but its exact length is difficult to trace in the fossils, the spine being either exfoliated or hidden in the sediment.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.