Abstract
A new leuconid cumacean, Leucon (Crymoleucon) rossi n. sp., is described from depths of 84 to 458 m in the Ross Sea off the Victoria Land coast. Leucon rossi n. sp. is distinguished from other members of the genus by a combination of characters including 1) a blunt, horizontally directed pseudorostrum without a distinctly protruding siphon; 2) strongly developed antennal notch; 3) entire dorsomedian margin of carapace appearing serrate, armed with 14 to 19 anteriorly curved spines in female (up to 21 in subadult males); 4) a small, but distinct, spine behind the frontal lobe; and 5) the uropodal peduncle slightly shorter than the exopod. After Leucon antarcticus Zimmer, 1907, L. rossi was the second most frequently occurring cumacean in the samples collected off Victoria Land. Statistical analyses showed significant differences in the proportion of carapace length and height of adult (all incubating in the present study) and immature females compared to immature males; no adult males were available for study.
Highlights
Zimmer 1907 is the only species of the genus Leucon Krøyer, 1846 currently reported from the Ross Sea (Jones, 1971)
The material of Leucon rossi was collected during the 19th expedition of RV Italica to the Ross Sea
From February 9 to 22, 2004, 13 of 19 samples containing specimens of the species were collected in depths of 84 to 458 off the coast of Victoria Land with a modified Rauschert dredge
Summary
Leucon (Crymoleucon) rossi, a New Species (Crustacea: Cumacea: Leuconidae) From the Shelf Waters of the Ross Sea (Antarctica), With a Key to the Genus Leucon South of 60°S Follow this and additional works at: https://aquila.usm.edu/fac_pubs Part of the Marine Biology Commons. Leucon (Crymoleucon) rossi, a new species (Crustacea: Cumacea: Leuconidae) from the shelf waters of the Ross Sea (Antarctica), with a key to the genus Leucon south of 60°S. Palabras clave: Crustacea, Cumacea, Leuconidae, Leucon rossi, nueva especie, Antártida, mar de Ross
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