The new species can be distinguished from its congeners by the inner plate of maxilla 1 having four setae, the outer ramus of uropod 2 being about 66% of the length of the inner ramus, the ramus of uropod 3 being about 3.25 times as long as the peduncle and the telson being cleft for one-fifth of its length.
It was found that: All the ACP activity in substantia gelatinosa of the middle segment (L1) was lost after transection of dorsal roots, whereas at the upper and lower adjacent segments (T13.L2),the ACP was absent in the lateral part of RS.
richardsonae Lombardo, 1988) by the presence of a large, subconical median tubercle on the telson, a much higher uropodal exopod partly covered with spiny and rounded tubercles, and a distinct spinulation pattern on all pereiopods.
We decided to propose a subspecific status to the West Pacific population, in order to emphasize the slight but constant differences observed in the telson in this obviously allopatric form of the species.
Nous avons décidé de proposer un statut de sous-espèce pour la population du Pacifique ouest afin de marquer les différences, légères mais constantes, observées sur le telson chez cette forme manifestement allopatrique de l'espèce.
Les trois espèces peuvent être différenciées par la suture transversale de l'uropode, les épines du telson et des péréiopodes et enfin la structure du sternite du péréiopode 4.
The shared 2,2 setal pattern on the endopod of the maxilla and the same type of antenna and telson in all of these species, confirm a close phylogenetic relationship among them and their placement within the family Varunidae.
The thickened margins of the periproct and peristome apertures account for load-bearing capacity as well as the thickned meridional structures which carry a greater portion of stress than the thinner parts of the test.
miliaris application of time lapse photography allows a study of the very slow movements of coelom cells during the healing process of small wounds on the surface of the calcareous skeleton near the periproct.
type and arrangement of chaetae, modified fifth setiger, caruncle, branchiae, pygidium) when examined with SEM.
triestinus the upper lip is hypertrophied and strongly protruding) and the pygidium (in P.
Müller consists only of the differentiation of the pygidium.
However, an histological study of these regenerates shows a beginning of mesodermal segmentation and parapodial differentiation in the area between the regenerated pygidium and the stump.
A simple model is proposed, allowing for these results, which states that the larval body of a polychaete consists of two regions with completely different positional values (episphere - prostomium; hyposphere - pygidium).