Monstrilloida (Crustacea: Copepoda) from the Beagle Channel, South America

Abstract

Monstrilloid copepods were collected during zooplankton surveys in the Beagle Channel at the southernmost end of South America. These specimens represent two species of Monstrillopsis, one of them undescribed, and one new species of Monstrilla. Monstrillopsis igniterra n. sp. is related to forms of the M. dubia species group, and particularly to M. ferrarii and M. chilensis. It differs from these species in the relative length of the antennules, the shape and relative size of the genital double and anal somites, details of the antennular armature, and the possession of a short inner caudal seta. The other species of Monstrillopsis, M. chilensis, was previously known only from the Southeast Pacific off Chile, and was originally described from female specimens only. Male individuals found in the Beagle Channel are described and assigned herein to this species. These are the first records of Monstrillopsis from high latitudes of South America. The new species Monstrilla patagonica n.sp. is represented by males. It is characterized by the structure and relative size of the genital lappets, details of the antennular structure, armature, relative size and the number (6) of caudal setae. It belongs to a small group of species with highly modified, pectinate male antennules. A female specimen identified as M. helgolandica 35 years ago from southern Argentina is tentatively reidentified as the female of this new species, based on its differences from M. helgolandica and the rarity of this species group in the region.

A new species of Monstrillopsis (Crustacea, Copepoda, Monstrilloida) from the lower Northwest Passage of the Canadian Arctic

“…3A). In the other species these elements are equally or subequally long (Scott 1904; Sars 1921; Suárez-Morales and Ivanenko 2004; Suárez-Morales et al 2006, 2008); 2) the new species has a unique character on the left antennule, with a supernumerary spine on the first segment, a character that has not been observed in any other monstrilloid, probably reminiscent of an ancestral armature/fusion pattern of this segment which is known to have only a single element (Grygier and Ohtsuka 1995). …”

“…50–56% of total body length), four caudal setae, a well-defined digitiform inner lobe on the female fifth leg, an outer lobe armed with three long setae, antennule relatively short (30–35% of cephalothorax length) distinctly 4-segmented, and a relatively long genital double-somite (ca. 30% of urosome) with an expanded proximal half (Suárez-Morales et al 2006, 2008). …”

“…4B), M. dubioides (Sars 1921; Suárez-Morales and Ivanenko 2004, fig. 9A), M. chilensis (Suárez-Morales et al 2006), and Monstrillopsis igniterra (Suárez-Morales et al 2008, fig. 2B).…”

“…3E); all the known females of the genus have a conspicuous, well-developed inner lobe, reaching beyond the mid-length of the outer lobe as in M. ferrarii (Suárez-Morales and Ivanenko 2004, fig. 6D,E) and M. igniterra (Suárez-Morales et al 2008, fig. 2D), or slightly shorter, as in M. dubia (Scott 1904, pl.…”

“…18), M. dubioides (Suárez-Morales and Ivanenko 2004, fig. 8E), and M. igniterra (Suárez-Morales et al 2008, fig. 2D) the anal somite is longer than the preanal somite.…”