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Monte Colombo, Italy

Bello G.,Arion
Neues Jahrbuch fur Geologie und Palaontologie - Abhandlungen | Year: 2012

The holopelagic mode of life in the superfamily Argonautoidea was achieved thanks to the evolution of peculiar characters, mainly relating to neutral buoyancy and egg brooding away from the sea floor. Some of these adaptations - egg-carrying structures in females of Tremoctopus and Argonauta, ovoviviparity in Ocythoe, swimbladder in females of Tremoctopus, Haliphron and Ocythoe, buoyancy regulating egg-case in female Argonauta - are indeed exaptations, i.e. either characters previously shaped by natural selection for particular functions (adaptations) or characters whose origin cannot be ascribed to the direct action of natural selection (nonaptations) that are coopted for new uses. Other exaptations are the pouch holding the coiled long hectocotylus in the males of all argonautoid genera and the autotomizing dorsal arms and adjoining pieces of web for defensive purposes in female Tremoctopus. © 2012 E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany.

In the last quarter of a century, two different specific names have been used in the scientific literature to indicate the same sepioline species, that is Sepietta obscura Naef 1916 and Sepietta petersi (Steenstrup 1887). The original description of the latter binomen was reviewed, as well as other relevant literature, and S. petersii iuas shown to be an invalid nominal species according to the rules of the International Code of Zoological Nomenclature. The nomenclatural revision of the genus Sepietta and the species contained in it was also carried out.

Dance M.A.,Texas A&M University | Bello G.,Arion | Furey N.B.,Texas A&M University | Furey N.B.,University of British Columbia | Rooker J.R.,Texas A&M University
Marine Biology | Year: 2014

Stable carbon (δ13C) and oxygen (δ18O) isotopes in cuttlebones of three species of Mediterranean cuttlefish (Sepia elegans, S. officinalis, and S. orbignyana) with different life histories were contrasted. Cuttlebone δ13C and δ18O were quantified at both the core and edge (representing early life and recent deposition, respectively) for all three species sampled from the southern Adriatic Sea in 2010 (n = 28). For S. officinalis, cuttlebone δ13C and δ18O values were both lower relative to S. elegans and S. orbignyana at the core by approximately 1.0-2.0 and 3.0 ‰, respectively. Differences between core and edge in cuttlebone δ13C and δ18O were also observed for S. officinalis with observed values at the cuttlebone edge (recent) exceeding core (early life) values by 2.5 ‰ for δ13C and 1.4 ‰ for δ18O. Differences in isotopic composition across S. officinalis cuttlebones are possibly reflective of ontogenetic migrations from nearshore nurseries (lower seawater δ13C and δ18O values) to offshore overwintering habitats (higher seawater δ13C and δ18O values). Overall, results from this study suggest that cuttlebone δ13C and δ18O hold promise as natural tags for determining the degree of spatial connectivity between nearshore and offshore environments used by cuttlefish. © 2013 Springer-Verlag Berlin Heidelberg.

Diversity among members of the genus Sepiola (Cephalopoda: Sepiolidae) in the NE Atlantic-Mediterranean area is fairly high; 10 species have been recorded. In this paper, a new species, Sepiola bursadhaesa n. sp., is described based on ten specimens from the Catalan Sea. They are lodged in the Museo Nacional de Ciencias Naturales of Madrid. The new species is compared with the closely related species Sepiola affinis Naef, 1912 and Sepiola intermedia Naef, 1912, the latter of which is possibly its sister species. Male Sepiola bursadhaesa n. sp. differs from Sepiola intermedia in having a very wrinkled and outward projecting tubercle on the copulatory apparatus, and the first three (rather than two) suckers of the dorsal row of the distal part of the hectocotylus enlarged. The middle sucker of the three suckers is the largest. In female S. bursadhaesa n. sp., unlike all other species in the genus, the bursa copulatrix is fused throughout its posterior rim to the inner side of the mantle. The relationships between the species of the Sepiola atlantica group sensu Naef (1923), to which S. bursadhaesa n. sp. belongs, are described. An identification key for this group is provided. 10.3989/scimar.03720.31A.

Arion | Date: 1980-05-20


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