AN INTERSEX IN CALANUS HYPERBOREUS 1) BY ROBERT J. CONOVER Woods Hole Oceanographic Institution, Woods Hole (Mass.), U.S.A. During laboratory studies of the behavior, feeding, and respiration of the large cold-water copepod Calanus hyperboreus (Kroyer, 1838) (see Conover, 1962), a stage V copepodid kept in the laboratory for about two months molted into an adult with a male-type, 5-segmented urosome; its first antennae were apparently lost during the molt. It was larger than any male observed in nature or produced in laboratory molts and unlike them it fed readily in the laboratory. The specimen proved to be an intersex. Within a month bright red-orange, irregularly shaped masses appeared in the dorsal part of the body (pl. II). In a typical gravid female Calanus hyperboreus, the eggs are bright red-orange, lying in oviducts on either side of the fat body in the dorsal portion of the body cavity. However, females have occasionally been found in which the gonadal material, rather than forming discrete oocytes, accumulated in the oviducts as rather amorphous orange-colored masses similar to those shown in pl. II. The intersex was captured in one of several tows taken during the afternoon of November 12, 1959, near 39°30'N
Crustaceana – Brill
Published: Jan 1, 1965
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera