Photo 13833112, (c) Jay L. Keller, all rights reserved

Medium
Attribution © Jay L. Keller
all rights reserved
Uploaded by jaykeller jaykeller
Source iNaturalist.org
Original https://www.inaturalist.org/photos/13833112
Associated observations

Photos / Sounds

What

Grant's Hercules Beetle Dynastes grantii

Observer

jaykeller

Date

March 1, 2018 07:46 PM PST

Description

The photos in this observation show four larval specimens as of March 1, 2018 that resulted from the pairing of this male:
https://www.inaturalist.org/observations/8046156
and this female:
https://www.inaturalist.org/observations/7689439
Grant's Hercules Beetles (Dynastes grantii) in captivity that were originally captured at black lights at the Mount Wrightson picnic area at Madera Canyon, Santa Cruz Co, AZ on 25 August, 2017.

The adults were kept in captivity and mated multiple times until the eggs were laid in two batches on October 23, 2017 (9 eggs) and about November 14, 2017 (3 eggs). The first three photos depict the hatchlings from the first batch and the fourth photo shows the only surviving specimen from the 2nd batch. Two eggs remain unhatched from the original batch (one visible in the primary photo). The rest dessicated.

The egg hatched during the 2nd week of February, 2018.

I will attempt to maintain periodic updates to these specimens' growth over time assuming they survive.

They are being maintained in a moist mixture of pulverized coconut husk mixed liberally with rotting (pre-baked) Western Sycamore (Platanus racemosa) wood obtained at Marian Bear Park, San Diego, CA.

Prior to the introduction of the sycamore wood about one week after hatching, it was clear that the larvae were happily subsisting on the coconut husk substrate.

Larvae generally take between 2 and 3 years to reach adulthood.

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