Genetic differentiation in the circum-Antarctic sea spider Nymphon australe (Pycnogonida; Nymphonidae).
From egg to "no-body": an overview and revision of developmental pathways in the ancient arthropod lineage Pycnogonida. Front.
The Pycnogonida of the YP has the most records within Mexico (Child, 1979; Munilla, 2002).
In particular, Anoplodactylus is one of the most numerous genera of Pycnogonida, with more than 180 species widely distributed and very common in shallow waters.
All chelicerates other than the Pycnogonida have an Entosternite within the prosoma cavity to which the leg muscles are attached [9].
Morgan, "The swimming of Nymphon gracile (Pycnogonida).
A new sea spider (Pycnogonida) with a flagelliform telson from the Lower Devonian Hunsruck Slate, Germany.
Group Paleozoic Mesozoic Cenozoic Total Pycnogonida 6 3 -- 9 "Euchelicerata" 5 -- -- 5 Xiphosura 75 20 1 96 Chasmataspidida 8 -- -- 8 Eurypterida 241 -- -- 241 Scorpiones 79 16 16 111 Opiliones 7 1 17 25 Phalangiotarbida 30 -- -- 30 Pseudoscorpiones 1 2 35 38 Solifugae 2 1 2 5 Acari: Anactinotrichida -- 1 10 11 Acari: Actinotrichida 15 15 253 283 Palpigradi -- -- 1 1 Ricinulei 15 -- -- 15 "Pantetrapulmonata" 3 -- -- 3 Trigonotarbida 71 -- -- 71 Araneae 18 31 930 979 Haptopoda 1 -- -- 1 Amblypygi 5 1 3 9 Uropygi 6 1 -- 7 Schizomida -- -- 4 4 all Chelicerata 588 92 1272 1952 Arachnida only 253 69 1271 1593 Table 2.--Significant localities yielding fossil Chelicerata referred to in the text, including details of their stratigraphic position and approximate age in millions of years (Ma).
Growth and reproduction of Pycnogonum litorale (
Pycnogonida) under laboratory conditions.
Arthropoda (Aglaspidida,
Pycnogonida and Chelicerata).
1 2 Crustaceans Cancer porteri 252 137 124 115 Homalaspis plana 8 Platymera gaudichaudii 18 41 7 2 Pleuroncodes monodon 17
Pycnogonida Order Pantopoda 1 2 1 Total 279 209 143 130 Taxa Time after Total abandonment (days) 106 116 156 Chondrichthyes Schroederichthys chilensis 3 Osteichthyes Thyrsites atun 1 Ophichthus remiger 2 Prolatilus jugularis 1 Merluccius gayi gayi 25 Congiopodus peruvianus 1 Mollusks Aeneator sp.
Responses of Nymphon gracile (
Pycnogonida) to pressure cycles of tidal frequency.
Pycnogonida: Achelia assimilis (Haswell, 1885); Tanystilum orbiculare Wilson, 1878.
The epifauna was composed of 46 Scaphopoda and mollusca species, 36 Fish, 33 Polychaeta, 29 Crustacea, 6 Echinodermata, 2 Cnidaria (Anthozoa), 3 Sipuncula, 1 Nemertini, 2 Ascidiacea and 1
Pycnogonida. Of a total of 159 species, 59 species were found at the 5 m depth contour, 42 at 10 m, 76 species at shallow waters, and 99 at deep waters (Table 2).
Mollusca Bivalvia 119 spp., Gastropoda Fissurellidae 42 spp., Crustacea Isopoda 133 spp., Decapoda 619 spp., Stomatopoda 42 spp.,
Pycnogonida 54 spp., Brachiopoda 14 spp., Asteroidea 83 spp., Echinoidea 38 spp.
