Spawn in two deep-sea volute gastropods (Neogastropoda: Volutidae) from southwestern Atlantic waters

PASTORINO, GUIDO; PASTORINO, GUIDO; TESO, VALERIA; TESO, VALERIA; PENCHASZADEH, PABLO E.; PENCHASZADEH, PABLO E.

DEEP-SEA RESEARCH. PART 1. OCEANOGRAPHIC RESEARCH PAPERS

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2017 vol. 130 p. 55 - 62

0967-0637

The gastropods Odontocymbiola pescalia and Provocator corderoi and their egg capsules were collected by the R/VPuerto Deseado from the Mar del Plata Submarine Canyon (~ 37°53′S, at depths of 291?1404 m) and fromBurdwood Bank (~ 54°27′S, 128?785 m). Odontocymbiola pescalia egg capsules measured 15.67±3.38 mm indiameter. They were subspherical in shape with an external calcareous layer. Each egg capsule contained 3?5embryos and white material as extra embryonic food. Embryos grew to a size of up to 9.3±1.1 mm in meanshell length before hatching as crawling juveniles. The spawn of P. corderoi consisted of a single dome shaped eggcapsule of 14.17±1.5 mm in diameter, attached to hard substrata by a basal membrane with a rounded outline.A curved semilunar furrow (seam) on one side of the capsules was always present. The number of embryos percapsule was 2?6. Embryos hatched as crawling juveniles with a shell length of 5.9±0.6 mm.The size and number of whorls in the hatchling shell suggested a slow rate of development, akin to manyother deep-sea invertebrates. The egg capsules and reproductive development strategies of both species werecompared with those from other congeneric representatives.