- 著者
- Kakui Keiichi Fujita Yoshihisa
- 出版者
- Cambridge University Press
- 雑誌
- Journal of the Marine Biological Association of the United Kingdom (ISSN:00253154)
- 巻号頁・発行日
- vol.103, 2023
- 被引用文献数
- 1
We describe a new sea spider species, Pantopipetta hosodai sp. nov., based on one juvenile female collected from a submarine cave ('Akumanoyakata' Cave) in Shimojijima Island, Miyako Island Group, Ryukyu Islands, southwestern Japan. It was collected from the second slope zone of the cave, 80-100 m from the entrance, no light, low salinity and with rocky substrate. This is the first record globally of a Pantopipetta species from a submarine cave and anchialine environment. Pantopipetta hosodai sp. nov. resembles Pantopipetta auxiliata, Pantopipetta lenis and Pantopipetta oculata in having auxiliary claws, but differs from them in having a palp with three short distal articles, lateral processes without dorsodistal tubercles, coxae 1 and 3 of legs 1-3 each with one long dorsal tubercle and one dorsodistal tubercle bearing a seta on each femur. Features of the palp appear to delineate two species groups in Pantopipetta, i.e. (1) those having four small distal articles, and a small, basal palp article between the lateral cephalon process and longest palp article (eight-articulate palp) and (2) those having three small distal articles, and lacking the small basal article (six-articulate palp), but further detail examination of the described species is needed. We discuss the diagnostic characters separating Pantopipetta and Austrodecus and the generic affiliation of Austrodecus aconae. Few pycnogonids from marine or anchialine caves have been identified to species, and it is generally unknown whether cave-dwelling pycnogonids tend to be troglobites.
- 著者
- Onuki A Somiya H
- 出版者
- Marine Biological Association of the United Kingdom
- 雑誌
- Journal of the Marine Biological Association of the UK (ISSN:00253154)
- 巻号頁・発行日
- vol.84, no.4, pp.843-850, 2004-08
The John dory, Zeus faber, has a pair of intrinsic sonic muscles on the swimbladder wall and produces sounds by rapid contractions of the muscles. The physical properties of the sounds and the detailed innervation pattern to the sonic muscle were investigated. The dory emitted two types of the sounds: "bark" and "growl". The bark consisted of continuous multiple pulses and lasted about 85ms on the average. The growl consisted of a group of intermittent single-pulses and lasted for 50 ms to 1.2 s. The main frequencies of both sounds were almost similar and ranged between 200 to 600 Hz. The sonic muscles were innervated by the sonic branches of the 1st.4th spinal nerves. Interestingly, the innervation from the first spinal nerve was newly revealed in the present study. Total of 1,700 myelinated axons innervated the sonic muscles on both sides. There was no sex difference in the sonic muscle size as judged by the sonic muscle-somatic index (SMSI, male: 0.675%, female: 0.670%). The sounds in the dory possibly function as a threatening means.