MACNBR   00242
MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Marsupial brooding in the sea cucumber Cladodactyla crocea (Lesson, 1830) (Holothuroidea : Cucumariidae) from Southwestern Atlantic Ocean.
Autor/es:
MARIANO IGNACIO MARTINEZ; PABLO ENRIQUE PENCHASZADEH; EZEQUIEL ALBA-POSSE
Lugar:
San José
Reunión:
Congreso; 3er Congreso Latinoamericano de Equinodermos; 2016
Institución organizadora:
Universidad de Costa Rica
Resumen:
Around 120species of echinoderms were reported as brooders in Southern waters. We studiedsamples of Cladodactyla crocea fromthe Argentine Sea. Fourteenfemales of C. crocea (Echinodermata : Holothuroidea) with 2 to 35 brooders were analyzed in samples from August. Mothers´ sizes were up to 20.0mm length. Brooders were found in a dorsal tube or marsupia made by the bindingof the two dorsal ambulacral rows. This structure protects the brooders throughbrooding period (May to August). Oocytesizes were analyzed before release; with a diameter up to 1 mm. Brooderswere all in a near free stage, measuring up to 1.5 mm length. The oldest stagesrecorded were adult like specimens, with 3 ambulacra on ventral side, two rowsof podia quite similar to the adult, and tentacles slightly extended. About theinternal anatomy, the calcareous ring is delicate and thin. There is one notcalcified madreporite and one polian vesicle. This primary study indicates manydifferences in ossicles? shape and internal anatomy of brooders. Those havebars and plates without holes, instead of well-developed plates with multipleholes, and bars with two holes, quite common on adults. This work will helpwith the recognition of free juveniles of C.crocea in SWAO. Besides it will enlarge the knowledge about brooding onthis family, with a great heterogeneityand a particular concentration in southern oceans.