Nahecaris stuertzi JAEKEL, 1921

Taxonomy

Phyllocarid

Kingdom: Animalia
Phylum: Arthropoda Latreille 1829
Class: Malacostraca Latreille 1802
Order: Archaeostraca Claus 1888
Family: Rhinocarididae
Genus: Nahecaris
Species: Nahecaris stuertzi
Author Citation JAEKEL, 1921

Geological Time Scale

Eon: Phanerozoic
Era: Paleozoic
Period: Devonian
Sub Period: None
Epoch: Early
International Age: Emsian (early)

Stratigraphy

Hunsrück Slate Group
Kaub Formation

Provenance

Acquired by: Purchase/Trade

Dimensions

Length: 5 cm

Location

Grube Eschenbach
Bundenbach
Rheinland-Pfalz
Germany

• bundenbach
• devonian
• dilophaspis
• emsian
• hunsrueck slate
• nahecaris

Comments

Taxonomy from Fossilworks.com 

Brauckmann et al. 2002, p.  215 claim that "Nahecaris is a subjective junior synonym of Dilophaspis as already suggested by HAHN (1990)."

Description from Südkamp 2017, p. 83: "Nahecaris is the most common non-trilobite arthropod. The large bivalved shield (carapace) covers the head, thorax, and anterior segments of the abdomen. Dorsally, a short anterior rostral plate and a longer posterior median plate separate the valves. The carapace shape (deep  and rounded or long and narrow) and the ornamentation (generally fine ridges parallel to the oral border) varies. A strengthened rim along the margin forms a doublure. The head bears a pair of large, club-shaped, stalked eyes, and two pairs of biramous antennae, the second much larger than the first. The thoracic segments each bear a pair of biramous slender limbs (thoracopods) that decrease in size posteriorly. Mostly, the endopods are curved downwards so that they form a cone-shaped feeding basket. The abdomen consists of seven cylindrical segments, of which only up to four are visible. The first five bear biramous limbs (pleopods) made up of flap-like branches. The seventh abdominal segment is twice to three times longer than the others. The abdomen terminates with a median telson spine, flanked by two much longer, and coarser, lateral furcal branches. The ornament of abdomen and telson is similar to that of the carapace."

Line drawing from Broili, 1929, p. 256:

References:

Broili, F. (1929) Beobachtungen an neuen Arthropodenfunden aus den Hunsrückschiefern. Sitzungsber. d. b. Akad. d. Wissensch. mathem.-naturw. Abt. 253-280. Taf.
Jan Bergström et al. (1987) Nahecaris stuertzi , a phyllocarid crustacean from the Lower Devonian Hunsrück Slate. Paläontologische Zeitschrift 61(3):273-298. DOI 10.1007/BF02985909
Brauckmann, C., Koch, L., Gröning, E. (2002) New evidence for the synonymy of Dilophaspis and Nahecaris (Phyllocarida; Lower Devonian; 
Rhenish Massif). Paläontologische Zeitschrift, 76 (2): 215-222, Abb. 1-6, Tab. 1.
Südkamp, W. (2017) Life in the Devonian. Identification book Hunsrück Slate fossils. Verlag Dr. Friedrich Pfeil, München.