ISSN 1063-0740, Russian Journal of Marine Biology, 2008, Vol. 34, No. 1, pp. 9–16. © Pleiades Publishing, Ltd., 2008.
Original Russian Text © E.L. Markhaseva, 2008, published in Biologiya Morya.
The deep-sea copepods (Calanoida) are still rather
poorly studied, especially with respect to the abyssope-
lagic fauna of the World Ocean. However, the results of
investigations that have been carried out demonstrate
that this fauna is rich and diverse. Therefore, the ﬁnding
of a new genus and species belonging to the superfam-
ily Spinocalanoidea from the lower ultraabyssal zone of
the Kuril–Kamchatka Trench is of obvious interest.
sp.n. was found in samples col-
lected during an expedition of the P.P. Shirshov Insti-
tute of Oceanology (Moscow), performed in the 39th
cruise of RV
One female of the new species selected from sam-
ples ﬁxed with 4% formaldehyde solution was stained
with 70% alcohol solution of chlorazol black E. For
detailed morphological study, the mouth appendages
and swimming legs of the crustacean were detached
and placed into glycerol, then they were sketched using
a drawing tube, and ﬁnally placed into permanent prep-
The specimens of
Hulsemann et Grice,
1963 were obtained from the materials of a Russian
expedition to the Kuril–Kamchatka Trench aboard the
(39th cruise) and also from the collections of
a German expedition into the Northern Atlantic aboard
(sixth and seventh cruises).
Free segments of antennules and ancestral segments
are designated in the text by Arabic and Roman numer-
als respectively . One seta and one aesthetasc of an
antennular segment are designated as 1s + 1ae; the ﬁrst
to fourth pairs of swimming legs—as P1–P4.
The type material is deposited in the Zoological
Institute RAS (St. Petersburg).
Subclass Copepoda Milne–Edwards, 1830
Order Calanoida G.O. Sars, 1903
Superfamily Spinocalanoidea Vervoort, 1951
Family Arctokonstantinidae Markhaseva et. Koso-
Rostrum is in shape of a plate or absent.
Caudal rami and their inner setae are either symmetri-
cal or asymmetrical. Proximal segment of antennal
exopod is lacking the seta. Mandibular palp: basis bears
one to two setae, ﬁrst segment of the endopod has no
setae. Maxillula: distal endite of basis is fused to endo-
pod; rarely they are separated from each other (
), both the segments together bear two to four
setae, or no setae is present (
). Maxilla: Prox-
imal coxal endite bears one to two setae. Maxilliped:
terminal segment of endopod has two to three setae. P1:
on basal segment the seta is absent; endopod consists of
a single segment and has no inner lobe, bears four to
ﬁve setae; exopod consists of one or three segments.
P2: endopod consists of one or two segments; exopod
gen. n., sp. n.—A New Genus and Species
of Copepods (Copepoda: Calanoida) from the Abyssopelagic
Zone of the Kuril–Kamchatka Trench
E. L. Markhaseva
Zoological Institute RAS, St. Petersburg, 199034 Russia
Accepted May 17, 2007
—A female of
gen. n., sp. n., a new genus and species of copepods, is described
from the abyss of the Kuril–Kamchatka Trench. The new genus is placed in the family Arctokonstantinidae,
whose diagnosis is emended and supplemented with the following characters: mandibular basis with one to two
setae; mandibular endopod one without setae; maxillular distal basal endite plus endopod with two to four setae
or without setae. The features that distinguish
gen. n. from other representatives of this family are
as follows: mandibular palp with a long endopod segment one, endopod segment two with seven setae, and exo-
pod segment ﬁve with two setae; maxillula with distal basal endite lacking setae and separated from endopod
bearing three setae; maxillular precoxal arthrite with seven to eight setae and exopod with four setae; maxilliped
syncoxa without setae on precoxal endites and endopod of three segments. The genera
earlier included in the Spinocalanidae are herein transferred to the Arctokonstantinidae.
: copepods, Calanoida, Arctokonstantinidae, new genus and species, Kuril–Kamchatka Trench