Callinectes sapidus (blue crab) megalops larva

callinectes mega ventra spines w arrows BIGl 3

Blue Crab, Callinectes sp., (megalopa)

Collected: Off of Assateague Island, VA, June 2008 in the surf at a depth of 1-1.5m using an epibenthic sled

Notes. 1. Larvae of many swimming crabs in the genus  are common in this region. They are difficult to distinguish.

2. This specimen harbors a collection of the colonial ciliate Zoothamium sp. attached to its carapace and appendages (4).

 

ID notes: Arrows:

1. Rostrum (1)

2. spine on rostrum (2)

3. Lateral spines (3) on the ventral side of the carapace. These spines are characteristic features of many of the swimming (portunid) crab megalopae. The upper spine in this photo is obscured by a colony of Zoothamnium.

 

 

 

 

 

 

 

 

 

 

Below: Anterior of blue crab megalops

ID Notes:

1. The rostrum is pointed with two short, rounded, lateral projections. Most other common crab.

2. There are two posteriorly directed projections from the ventral side of the carapace best viewed if the crab is ventral-side up.

 uca mega 6-05 big