Trilobite eggs in New York


Trilobite eggs in New York

Despite a plethora of exceptionally preserved trilobites, trilobite reproduction has remained a mystery. No previously described trilobite has had unambiguous eggs or genitalia preserved. This study by Thomas A. Hegna and colleagues reports the first occurrence of in situ preserved trilobite eggs from the Lorraine Group in upstate New York, USA.

Like other exceptionally preserved trilobites from the Lorraine Group, the complete exoskeletons are replaced with pyrite. The eggs are spherical to elliptical in shape and nearly 200 micrometers in size.

The location of the eggs is consistent with where modern female horseshoe crabs release their unfertilized eggs from the ovarian network within their head. Trilobites likely released their eggs and sperm through a genital pore of as-yet-unknown location (but probably near the posterior boundary of the head).

Because pyrite preferentially preserves the external features of fossils, there is probably a bias in the fossil record toward the preservation of arthropods that brood eggs externally. If the reproductive biology of these trilobites is representative of other trilobites, they likely spawned with external fertilization as well, which may be the ancestral mode of reproduction for early arthropods.



Add Comment

all comments

  Other news

more
Singapore teen blogger Amos Yee granted US asylum

Singapore teen blogger Amos Yee granted US asylum..

24-Mar, 23:42

Singapore teen blogger Amos Yee, who was jailed twice in his homeland for...

County Londonderry: Prisoner dies in custody at Magilligan Prison

County Londonderry: Prisoner dies in custody at Magilligan Prison..

25-Mar, 12:21

The Northern Ireland Prison Service has confirmed that a prisoner has...

Zayn Malikís sister SLAMS Scarlett Moffatt after she branded him 'a d***head'

Zayn Malikís sister SLAMS Scarlett Moffatt after she branded him 'a d***head'..

24-Mar, 16:01

So Zaynís sister, Doniya, has hit back at the Gogglebox star, calling her...

Police investigate serious assault in Dumfries town centre

Police investigate serious assault in Dumfries town centre..

25-Mar, 07:10

A man is being treated in hospital following a serious assault in...

Why Did the N.Y. Times Enlarge This Woman?

Why Did the N.Y. Times Enlarge This Woman?..

06-Mar, 09:05

A photo of "Mad Men" star Christina Hendricks posted on the New York...

Purged from Turkey's army, officers seek asylum in Belgium

Purged from Turkey's army, officers seek asylum in Belgium..

09-Mar, 14:33

In the days after rogue soldiers tried to take over Turkey last year, the...

Metro of Love Episode 18

Metro of Love Episode 18..

13-Feb, 03:14

The following Metro of Love Episode 18 English Sub has been released....

Islamic State vows more attacks on Egypt's Christians

Islamic State vows more attacks on Egypt's Christians..

20-Feb, 06:50

An Islamic State affiliate in Egypt has released a new video showing the...