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Sepiolinae (mollusca: cephalopoda) from the Strait of Sicily
Full text linkNine species belonging to three genera of the subfamily Sepiolinae (Leach, 1817) were collected in the Strait of Sicily by two series of bottom trawl surveys carried out during the years 1985-87 and 1992: Sepiola rondeletii, Sepiola intermedia, Sepiola ligulata, Sepiola robusta, Sepiola affinis, Sepietta oweniana, Sepietta neglecta, Sepietta obscura and Rondeletiola minor. For each species, abundance, distribution, sex ratio and maturity condition were analysed. S. oweniana was the most abundant species, followed by R. minor, while the single record of S. ligulata indicates that the species is rare in the area. The bathymetric distributions observed generally agree with what is known for the species from the literature, but present data support the extension of the bathymetric range inhabited by S. robusta (down to 498 m). Mature specimens represented 81.8% of the examined sample, and no substantial differences in the percentages of mature individuals with season was noticeable; this supports the existence of an extended reproductive period in the Sepiolines
Using historical series of trawl surveys data to investigate cephalopods: a new method of exploratory analysis
No full textFirst record of Stoloteuthis leucoptera (Cephalopoda: Sepiolidae) in the Sardinian waters = Primo rinvenimento di Stoloteuthis leucoptera (Cephalopoda: Sepiolidae) nelle acque sarde
No full textMorphometric and meristic data of two mature females of Stoloteuthis leucoptera (Cephalopoda: Sepiolidae) from the Sardinian waters are reported. These are the first records of the species in the Sardinian seas and they add important information to our still poor knowledge on the species in the Mediterranean Sea
Chiroteuthis veranii and Ommastrephes bartramii (Cephalopoda: Teuthidae) from the Sardinian waters
No full textChiroteuthis veranii and Ommastrephes bartramii (Cephalopoda: Teuthidae) in the Sardinian waters
No full textFirst records of Ommastrephes bartramii and Chiroteuthis veranii (Cephalopoda: Teuthida) in the Sardinian waters are reported. Morphometric and meristic data of the specimens are listed and commented. Mature females of C. veranii were caught year-round; they had smaller size than maturing males and carried about 10 large ripe eggs (4.0-4.5 mm). Occurrence of O. bartramii near the bottom was linked to feeding descent
On the abundance and spatial distribution of Illex coindetii and Eledone moschata in the Sardinian Seas (central - western Mediterranean) – A preliminary and qualitative investigation with special attention to some environmental constraints
No full textMale reproductive system in Neorossia caroli (Joubin, 1902) (Cephalopoda: Sepiolidae) from the Sardinian waters (western Mediterranean Sea)
No full textThe male reproductive system of the bobtail squid Neorossia caroli (Cephalopoda: Sepiolidae) is described
in details for the first time, basing on 90 mature males caught from 500 to 1600 meters in the Sardinian
waters (western Mediterranean Sea). Up to 83 spermatophores were found inside the Needham‘s Sac.
Medium spermatophore length was 16.7 mm. Sperm mass, cement body and ejaculatory apparatus represented
52.4%, 29.3% and 29.7%, respectively, of the total spermatophore length. Empty spermatophores,
spermatophore sheaths and spermatangia also were found in the sac and are described.
Spermatangia implanted in several parts of males body (e.g. head, funnel and eyes) were recorded and
their occurrence is discussed. The spermatophoric reaction was induced in the laboratory by submerging
spermatophores in seawater and it is describe
Using historical series of trawl surveys data to investigate cephalopod life cycles. A new methodological approach towards an integrated fishery science
No full textAnomalies in Sepiolinae hectocotylization
No full textFour cases of anomalies of the copulatory arm in Sepiolinae (Cephalopoda: Sepiolidae) are reported. In one case (Sepietta oweniana), both dorsal arms were modified resulting in double hecocotylization. In another specimen probably of the same species the copulatory apparatus was formed by two fleshy multilobed formations situated on the dorsal and ventral side of the arm base. In one specimen of Rondeletiola minor the copulatory apparatus was inversely positioned on the arm base, and in one Sepiola intermedia specimen the inner free portion of the wrinkled tubercle was markedly enlarged
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