scholarly journals Gigantic Antarctic sea spiders need pores to breathe

2018 ◽  
Vol 221 (8) ◽  
pp. jeb181859
Author(s):  
Kathryn Knight
Keyword(s):  
Sea Spiders

scholarly journals Respiratory gut peristalsis by sea spiders

2017 ◽  
Vol 27 (13) ◽  
pp. R638-R639 ◽  
Author(s):  
H. Arthur Woods ◽  
Steven J. Lane ◽  
Caitlin Shishido ◽  
Bret W. Tobalske ◽  
Claudia P. Arango ◽  
...  
Keyword(s):  
Sea Spiders

scholarly journals THREE SPECIES OF SEA SPIDERS (PYCNOGONIDA) FROM SANTA MARTA, COLOMBIAN CARIBBEAN

2016 ◽  
Vol 29 ◽  
Author(s):  
Claudia P. Arango
Keyword(s):  
Sea Spiders ◽  
Distribución Geográfica

Se reportan tres especies de picnogónidos para la región sudoeste de Santa Marta en el Caribe colombiano. Nymphon surinamense, Anoplodactylus insignis y Pallenopsis schmitti fueron colectados en arrastres sobre fondos blandos entre 14 y 60 m de profundidad. Este reporte amplía la distribución geográfica de N. surinamense y A. insignis en el Caribe y resalta la abundancia de P. schmitti en el área. La distribución y la sistemática de las especies se discute brevemente y se presentan ilustraciones para cada una de ellas.

Recent collections of sea spiders (Arthropoda: Pycnogonida) from China seas, with some new records and a checklist of the area

Zootaxa ◽  
2020 ◽  
Vol 4802 (2) ◽  
pp. 361-373
Author(s):  
JIANJIA WANG ◽  
HESHAN LIN ◽  
DINGYONG HUANG ◽  
XINQING ZHENG ◽  
QINGHE LIU ◽  
...  
Keyword(s):  
East China Sea ◽  
New Records ◽  
East China ◽  
China Seas ◽  
The East China Sea ◽  
Sea Spiders ◽  
China Sea

Though research about sea spiders limited in China seas, a complete checklist has not yet exist so far. After checking recent collections obtained from Shandong, Zhejiang, Fujian and the East China Sea, all these sixty-eight specimens were identified as six species belonged to four families and five genera, including three ones new to China. We described and illustrated them in this study, and also revised all previous records about Chinese pycnogonids and provided a checklist for the presently known forty-one species. 

scholarly journals New sea spiders from the Jurassic La Voulte-sur-Rhône Lagerstätte

2007 ◽  
Vol 274 (1625) ◽  
pp. 2555-2561 ◽  
Author(s):  
S Charbonnier ◽  
J Vannier ◽  
B Riou
Keyword(s):  
Deep Sea ◽  
Middle Jurassic ◽  
Evolutionary History ◽  
Depositional Environment ◽  
Ecological Stability ◽  
Sea Spiders ◽  
History Of

The diverse and exceptionally well-preserved pycnogonids described herein from the Middle Jurassic La Voulte Lagerstätte fill a 400 Myr gap of knowledge in the evolutionary history of this enigmatic group of marine arthropods. They reveal very close morphological and functional (locomotion, feeding) similarities with present-day pycnogonids and, by contrast, marked differences with all Palaeozoic representatives of the group. This suggests a relatively recent, possibly Mesozoic origin for at least three major extant lineages of pycnogonids (Ammotheidae, Colossendeidae, Endeidae). Combined evidence from depositional environment, faunal associates and recent analogues indicate that the La Voulte pycnogonids probably lived in the upper bathyal zone ( ca 200 m). Our results point to a remarkable morphological and ecological stability of this arthropod group over at least 160 Myr and suggest that the colonization of the deep sea by pycnogonids occurred before the Jurassic.

Hox genes in sea spiders (Pycnogonida) and the homology of arthropod head segments

2006 ◽  
Vol 216 (7-8) ◽  
pp. 481-491 ◽  
Author(s):  
Michaël Manuel ◽  
Muriel Jager ◽  
Jérôme Murienne ◽  
Céline Clabaut ◽  
Hervé Le Guyader
Keyword(s):  
Hox Genes ◽  
Sea Spiders

scholarly journals Cambrian bivalved arthropod reveals origin of arthrodization

2012 ◽  
Vol 279 (1748) ◽  
pp. 4699-4704 ◽  
Author(s):  
David A. Legg ◽  
Mark D. Sutton ◽  
Gregory D. Edgecombe ◽  
Jean-Bernard Caron
Keyword(s):  
Cladistic Analysis ◽  
Major Constituent ◽  
Burgess Shale ◽  
Sea Spiders ◽  
Horseshoe Crabs ◽  
Stem Lineage ◽  
Trunk Limbs ◽  
Shale Formation ◽  
Early Palaeozoic

Extant arthropods are diverse and ubiquitous, forming a major constituent of most modern ecosystems. Evidence from early Palaeozoic Konservat Lagerstätten indicates that this has been the case since the Cambrian. Despite this, the details of arthropod origins remain obscure, although most hypotheses regard the first arthropods as benthic predators or scavengers such as the fuxianhuiids or megacheirans (‘great-appendage’ arthropods). Here, we describe a new arthropod from the Tulip Beds locality of the Burgess Shale Formation (Cambrian, series 3, stage 5) that possesses a weakly sclerotized thorax with filamentous appendages, encased in a bivalved carapace, and a strongly sclerotized, elongate abdomen and telson. A cladistic analysis resolved this taxon as the basal-most member of a paraphyletic grade of nekto-benthic forms with bivalved carapaces. This grade occurs at the base of Arthropoda (panarthropods with arthropodized trunk limbs) and suggests that arthrodization (sclerotization and jointing of the exoskeleton) evolved to facilitate swimming . Predatory and fully benthic habits evolved later in the euarthropod stem-lineage and are plesiomorphically retained in pycnogonids (sea spiders) and euchelicerates (horseshoe crabs and arachnids).

Neuroanatomy of sea spiders implies an appendicular origin of the protocerebral segment

Nature ◽  
2005 ◽  
Vol 437 (7062) ◽  
pp. 1144-1148 ◽  
Author(s):  
Amy Maxmen ◽  
William E. Browne ◽  
Mark Q. Martindale ◽  
Gonzalo Giribet
Keyword(s):  
Sea Spiders

Impact of sea spider parasitism on host clams: susceptibility and intensity-dependent mortality

2017 ◽  
Vol 98 (4) ◽  
pp. 735-742
Author(s):  
Katsumasa Yamada ◽  
Katsumi Miyazaki ◽  
Takeshi Tomiyama ◽  
Gen Kanaya ◽  
Yoshifumi Miyama ◽  
...  
Keyword(s):  
Clearance Rate ◽  
Adductor Muscle ◽  
Ruditapes Philippinarum ◽  
Mass Mortality ◽  
Manila Clam ◽  
Tokyo Bay ◽  
Sea Spiders ◽  
Sea Spider ◽  
Massive Scale ◽  
The Impact

Nymphonella tapetis (Pycnogonida, Ascorhynchidae) is an endoparasitic sea spider affecting bivalves. Recently, sea spiders have been found on a massive scale in the commercially important Manila clams (Veneridae, Ruditapes philippinarum) in Japan (Tokyo Bay). Simultaneously, mass mortality has occurred in this area. Local fishers assumed that this mass mortality was caused by the parasitic sea spider, despite the effect of the parasite and parasite intensity on the host being unknown. To evaluate the susceptibility of the Manila clam to sea spider infestation and the impact on mortality levels, we established six treatments at different infection intensities (density of newly hatched larvae of sea spiders) over a 6-month long laboratory experiment. We monitored mortality and three susceptibility indices (clearance rate, sand-burrowing speed and adductor muscle strength) under sufficient food conditions. Parasitization by sea spider affected clearance rate and sand-burrowing speed. The pattern of parasitic intensity effects on survival of Manila clam hosts was shown to be dependent on the levels of parasite numbers, i.e. clams with lower parasitic levels (total of <200 hatching larvae of sea spider given to a host) have a higher survival rate, and high mortality of host clams was shown in excessively higher parasitic densities (400–4000 individuals). Such pattern of parasitic effects on host survival might be one of the causes of mass mortality of Manila clams occurring in the field.

A variation of the smooth septate junction in sea spiders (Pycnogonida)

1981 ◽  
Vol 13 (1) ◽  
pp. 189-195 ◽  
Author(s):  
Colin R. Green
Keyword(s):  
Septate Junction ◽  
Sea Spiders
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