Cranchiids of the South Atlantic Mid-Oceanic Ridge: results from the first southern MAR-ECO expedition

Bolstad, K.S.R., Perez, J.A.A., Strugnell, J.M., and Vidal, E.A.G. (2015) Cranchiids of the South Atlantic Mid-Oceanic Ridge: results from the first southern MAR-ECO expedition. Journal of Natural History, 49 (21-24). pp. 1351-1371.

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Abstract

Cranchiids were the most diverse squid family collected during the first southern MAR-ECO expedition in late 2009, with nine taxa identified to species. A total of 45 young specimens were collected (mantle length 7.4-59.2mm), allowing a survey of early ontogenetic tentacular morphology in cranchiids using scanning electron micrographs. Paralarval tentacular sucker morphology appeared similar among species within the same subfamily: in the Cranchiinae, the paralarval suckers possess relatively large, narrowly polygonal or ovoid-faced pegs in the innermost ring around the aperture, and the infundibular ring lacks the dentition observed in most taoniin genera. Hook development in Galiteuthis armata appears to vary widely among small individuals. Tissue samples were also collected from five genera (Cranchia, Galiteuthis, Helicocranchia, Leachia and Teuthowenia); phylogenetic trees (maximum-likelihood and Bayesian methods) built using these cytochrome oxidase subunit I sequences and others available from GenBank show some support for the subfamilies Cranchiinae and Taoniinae, and that within the latter, the hooked taxa group together. It is hoped that reporting this opportunistic systematic and genetic information may be of eventual assistance in helping to resolve this most problematic of squid families.

Item ID: 46380
Item Type: Article (Research - C1)
ISSN: 1464-5262
Keywords: South Atlantic, sucker ultrastructure, ontogeny, Cranchiidae
Funders: Cen-SEAM, Auckland University of Technology
Date Deposited: 16 Nov 2016 07:45
FoR Codes: 06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060301 Animal Systematics and Taxonomy @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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