Coronocephalus

Coronocephalus is an extinct genus of trilobites in the Phacopid family Encrinuridae. Species are from the Silurian of Australia and from the Silurian and Ordovician of China.

Coronocephalus
Temporal range: 443.7–426.2 Ma
Coronocephalus gauluoensis
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
†Trilobita
Order:
†Phacopida
Family:
†Encrinuridae
Genus:
†Coronocephalus

Grabau, 1924
Species

Several, including:

  • †Coronocephalus elegans Xia
  • †Coronocephalus gauluoensis
Synonyms
  • Coronocephalina
  • Senticucullus
Fossil of Coronocephalus - picture taken at Museo di Arsago Seprio, Varese Province, Lombardy, Italy

Sexual differences between male and female Trilobite

The first sexual different between male and female trilobites proposed by amateur researcher Goo Chee Eng indicate that male will typical have elongated and slim body shape while female have Librigena and Thorax looks side expended and flat. The slightly curve and side expend of Librigena spine may provide the volume expend of upper Thorax during pregnant period. The Thorax portion of the first 6 segment will be inflated for pregnant female as it carry eggs at bottom of this first 6 segment.

Main difference between male and female for species Coronocephalus gauluoensis (Wu, 1979):

Male: Long and slim body shape; both Librigena straight and vertical extend to Pygidium portion (very close to body);

Female: Body shape look "U" shape with slightly shorter than male; both Librigena slightly curve and expend to outside;

See also
Sexual different between Coronocephalus proposed by amateur researcher Goo Chee Eng
The growth of Coronocephalus male(left) vs female(right) proposed by amateur researcher Goo Chee Eng
Coronocephalus gauluoensis male proposed by amateur researcher Goo Chee Eng, 3.7cm, China
Coronocephalus gauluoensis male proposed by amateur researcher Goo Chee Eng, 4.8cm, China
Coronocephalus gauluoensis male proposed by amateur researcher Goo Chee Eng, 6cm, China
Coronocephalus gauluoensis male proposed by amateur researcher Goo Chee Eng, 7.3cm, China
Coronocephalus gauluoensis male proposed by amateur researcher Goo Chee Eng, 7.8cm, China
Coronocephalus gauluoensis female proposed by amateur researcher Goo Chee Eng, 2.3cm, China
Coronocephalus gauluoensis female proposed by amateur researcher Goo Chee Eng, 4.5cm, China
Coronocephalus gauluoensis female proposed by amateur researcher Goo Chee Eng, 4.3cm, China
Coronocephalus gauluoensis female proposed by amateur researcher Goo Chee Eng, 5.6cm, China
Coronocephalus gauluoensis female proposed by amateur researcher Goo Chee Eng, 6.3cm, China
Coronocephalus gauluoensis female proposed by amateur researcher Goo Chee Eng, 5.8cm, China
Coronocephalus gauluoensis female proposed by amateur researcher Goo Chee Eng, 6.7cm, China
Coronocephalus gauluoensis female proposed by amateur researcher Goo Chee Eng, 6.2cm, China


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