Report Fossil
-
Daohugounectes primitivus Wang, Ponomarenko & Zhang, 2009
Images:
By oilshale
Taxonomy
Water beetle grub
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta Linnaeus 1758
Order: Coleoptera Linnaeus 1758
Family: Coptoclavidae Ponomarenko, 1961
Genus: Daohugounectes
Species: Daohugounectes primitivus
Author Citation Wang, Ponomarenko & Zhang, 2009
Geological Time Scale
Eon: Phanerozoic
Era: Mesozoic
Period: Jurassic
Sub Period: None
Epoch: Middle
International Age: Callovian to Oxfordian
Stratigraphy
Jiulongshan Formation
Daohugou Bed
Provenance
Acquired by: Purchase/Trade
Dimensions
Length: 22 mm
Location
Daohugou
Ningcheng County
Nei Mongol
China
- ningcheng
- nei mongol
- daohugou
- grub
- water beetle
- daohugounectes
- coptoclavidae
- china
- tff-oilshale-ar2509
Comments
Taxonomy from Wang et al. 2009.
Daouhugounectes primitivus is a predaceous water beetle grub with raptorial forelegs and natatorial mid- and hindlegs.
Diagnosis from Wang et al. 2009, p. 653." Head transverse, narrowing anterior of the base; nasale with rounded lateral lobes. Mandible with retinaculum near its middle. Prothoracic tergite somewhat longer than meso- and metathoracic tergites. Legs relatively short; mid- and hindleg distinctly longer than foreleg, their femora, tibiae and tarsi subequal in length, tibae slightly dilated at apex, tarsi roundly dilated anteriorly. Forelegs with sparse strong setae; meso- and metafemora with sparse thin hairs at posterior margin, tibiae and tarsi with short oblique setae and long think hairs along both sides. Abdomen with nine segments, seven of them transverse; sclerites in tergal position; sclerite VIII almost circular, curved ventromedially. Small subquadratic segment IX present between urogomphi. The closing apparatus of the spiracles on segment VIII weakly developed; trachea with helical thickening weak (compared to that of Coptoclava). Urogomphi approximately 2.5 times as long as tergite VIII."
Line drawing from Wang et al, 2009 (scale bar 5 mm):
Reference:
B. Wang, A. G. Ponomarenko, and H.-Ch. Zhang (2009): A new coptoclavid larva (Coleoptera: Adephaga: Dytiscoidea) from the Middle Jurassic of China, and its phylogenetic implication. Paleontological Journal 43(6):652-659.
Report Fossil
User Feedback
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now