1. A phylogenetic study of the squid family Onychoteuthidae (Cephalopoda: Oegopsida)
- Author
-
Bonnaud, L., Rodhouse, P. G., and Boucher-Rodoni, R.
- Abstract
The oegopsid squid family Onychoteuthidae presently comprises six genera (Moroteuthis, Onychoteuthis, Ancistroteuthis, Kondakovia, Onykiaand Chaunoteuthis) but the status of some of these is still uncertain. An interdisciplinary study was undertaken to clarify the phylogenetic relationships, which included a morphological approach (morphometric analysis), and a molecular study of a mitochondrial gene portion (l–rRNA gene, 16S).The morphometric analysis identified two groups, one including some Onychoteuthisand some Moroteuthis knipovitchi, and another including the remaining genera or species. At the intrageneric level, M. knipovitchiappears to be separated from the other species of the genus; M. robustais closely related to M. ingensand M. pacifica. Morphometric analysis confirmed that Kondakovia longimanais different from M. ingens. Likewise, Onychoteuthiswas clearly separated from the other genera, but there is neither geographical grouping nor morphometric differentiation of the Onychoteuthisspecies with the parameters measured. Some specimens were apparently intermediate between the Onychoteuthisand Ancistroteuthisgroups.On a molecular basis, the Onychoteuthidae appeared to be monophyletic. Monophyly of the genus Moroteuthis(four species studied) was not strongly supported: M. knipovitchiwas distinct from the others. The molecular analysis showed three Hawaiian species, Onychoteuthis compacta, O. sp. B and O. sp. C, to be closely related. The gene sequence for the newly created species of Onykiais clearly different from all the others, indicating that it is a true species.
- Published
- 1998
- Full Text
- View/download PDF