In two such instances, which were recorded in different sagittal plane slices tilted at 90[degrees], a bristle group on the lower side of the statocyst
suddenly flopped to the epithelial floor, towards the nearby ciliary dome, then straightened immediately, returning to its previous upright stance (Fig.
The squid make use of two narrowly spaced organs called statocysts
to sense sound.
Other researchers in Alkon's lab have detected GABA in the tiny, hair-bearing cells of statocysts
-- organs used by H.
Figures 3D and E illustrate the statocyst
of a juvenile that has simple setae interspersed with serrate ones.
of ctenophores is a long-studied structure whose function is generally understood.
729 Nauplius shape -- pandulate Third stage dorsomedian abdominal protozoea spines 5 3 First stage posterior ventral mysis serrations on the carapace absent absent Third stage statocyst
present absent mysis First stage scaphognathite setae postlarva in maxilla 20 21 scaphocerite spines on outer margine of antenna 1 2 thoracic sternal plate spines 2, 2, 0, 0, 0 -- M.
The appearance of larval structures, such as the velum, statocyst
, left and right digestive diverticula, eyespots, and propodium was recorded.
The ctenophore statocyst
exploits both motile and sensory functions of cilia (Tamm, 1982, 2014a, b).
The squid statocyst
and its sensory hair cells share many characteristics with vertebrate vestibular systems yet maintain intriguing morphological differences, despite the functional commonalities of the two systems (Dilly et al.
The rhopalial touch plates and sensory pads may represent sensory components of statocyst
function in cubomedusae considering the tight placement of rhopalia in their rhopalial niches (which can totally enclose the rhopalia in some species) and the constant movement of the tissues during swimming.
Additionally, GABA reduces the resting electrical activity of the squid statocyst
(Tu and Budelmann, 2000).
9 mm; rhopalium has simple statocyst
without obvious ocellus (Fig.