Reproduction in Heteroteuthis dispar (Ruppell, 1844) (Mollusca: Cephalopoda): a sepiolid reproductive adaptation to an oceanic lifestyle
| Autor: | Hoving, H. J. T., Laptikhovsky, V., Piatkowski, U., Onsoy, B., Oensoy, B. |
|---|---|
| Přispěvatelé: | Ocean Ecosystems |
| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
0106 biological sciences
REDESCRIPTION Zoology Aquatic Science SQUID 010603 evolutionary biology 01 natural sciences FECUNDITY DIET Heteroteuthis dispar Reproductive biology 14. Life underwater Mollusca AEGEAN SEA Ecology Evolution Behavior and Systematics Ecology biology 010604 marine biology & hydrobiology biology.organism_classification JUVENILE CEPHALOPODS Sperm Female sperm storage Spermatophore Coelom Sepiolidae |
| Zdroj: | Marine Biology, 154(2), 219-230. SPRINGER HEIDELBERG Marine Biology, 154 . pp. 219-230. |
| ISSN: | 0025-3162 |
| Popis: | Small cephalopods of the genus Heteroteuthis are the most pelagic members in the family Sepiolidae. This study examines the reproductive biology of Heteroteuthis dispar (Ruppell, 1844), the first such study on any member of the genus, based on 46 specimens (27 females and 19 males) collected during the Mar-Eco cruise in the North Atlantic in the region of the Mid-Atlantic Ridge in 2004, and compares it with reproductive features in the less pelagic members of the family. The unusually large spermatophores of the males have a very small ejaculatory apparatus and cement body, relative to the size of the sperm mass. Females first mate when they are still maturing: a large sperm mass (up to 3.4% of the female body mass), consisting of one to several spermatangia, was found in an internal seminal receptacle of the majority of the females examined regardless of their maturity state. The seminal receptacle has a unique form and position in this species. The receptacle is a thin-walled sac at the posterior end of the visceral mass that is an outpocketing of, and opens into, the visceropericardial coelom. Spermatangia and sperm from the spermatangia apparently enter into the visceropericardial coelom (which is mostly occupied by the ovary) from the seminal receptacle indicating that ova are fertilised internally, a strategy unknown for decapodiform cephalopods (squid and cuttlefish), but present in most octopods. Fecundity of Heteroteuthis dispar (1,100-1,300 oocytes) is much higher than in other sepiolids whereas the egg size (mean max. length similar to 1.6 mm) is the smallest within the family. Spawning is continuous (sensu Rocha et al. in Biol Rev 76:291-304, 2001). These and other reproductive traits are discussed as being adaptations to an oceanic lifestyle. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink