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44
Solaster affinis, Brandt1.
Tab. Vin, Fig. 11. Tab. IX, Fig. 7. 8. 14.
Denne Søstjerne, hvoraf vi have indsamlet 10 voxne
Exemplarer og nogle Unger i forskjellige
Udviklingsstadier, er efter alt at dømme den af H. Martens i
Behringsstrædet fundne Solaster affinis, af hvilken han
efterlod en saa god Tegning, at Brandt fandt sig
foranlediget til at opstille den som en fra Solaster pappo&us
forskjellig Art, under Navnet affinis. Men da Brandt’s
Beskrivelse er meget kort, synes Arten at være for saa vidt
glemt, som den kun omtales af enkelte Forfattere,
hvoriblandt Lütken,2 der dog er tilbøielig til at antage den for
et ungt Exemplar af Solast, papposus. Wyville Thomson
omtaler en Varietet af Solaster papposus med 10 Arme af
•±0mm Størrelse fra Armspids til Armspids, og som er
funden i den kolde Area i Færø-Shetlandsrenden paa 610
Favnes Dyb i temmelig stor Mængde.3
Siden vor første Afhandling i Magazin for
Naturvidenskaberne4, hvori vi opstillede Solaster affinis som en
selvstændig Art, har der af DHerrer Dnncan & Sladen5
været reist Tvivl om Artens Selvstændighed. Omendskjønt
disse Forskere have henført den til Solaster papposus,
erkjende de dog, at den afviger i enkelte Dele væsentlig fra
denne og mene derfor, at den kan betragtes som en
Dyb-vandsvarietet. Da vi efter vore første Undersøgelser have
faaet et rigere Materiale at raade over, have vi ogsaa
kunnet anstille Sammenligninger, ligesom Skeletdelene ere
blevne nøiagtigere undersøgte, og vi ere derved komne til
det Resultat, at Afvigelserne fra Solaster papposus ere saa
betydelige og saa konstante, at vi fremdeles maa anse
Solaster affinis for en god Art.
Forholdet imellem den lille og store Radius er som
1 : 21/i. Det største Exemplar maalte 60mm fra Armspids
til Armspids, det mindste 61/2mm.
Skiven er temmelig bred med 10 Arme, der ere korte
1 Prodromu8 descriptions animalium ab H. Martensis in orbis
terrarum circumnavigatione observatorium auctore J. F. Brandt.
Fase. 1. Petropoli 1835, pag. 71.
2 Oversigt over Grønlands Echinodermata af C. F. Lütken.
Kjøbenhavn 18">7, pag. 415.
3 The depths of the "sea by C. Wyville Thomson. London 1847,
pag. 118.
4 Nyt Magazin for Naturvidenskaberne, 23 B. 3 H., pag. 57,
1877.
5 Duncan & Sladen. A Memoir on the Echinodermata of the
Arctic Sea to the West of Greenland 1881, pag. 39.
Solaster affinis, Brandt1.
PL VIII, fig. 11. Pl. IX, figs. 7. s. 14.
This starfish, of which we have collected 10 full
grown specimens, and. also, a few young ones in various
stages of development: is, judging from all appearances,
the Solaster affinis found by H. Martens at Behrings straits,
and, of which lie left behind him such a good illustration,
that Brandt found himself under the necessity, of assigning
it, as a genus differing from Solaster papposus, and which
he designated affinis. But, as Brandt’s description is very
short, the genus seems to have been so far forgotten, that
it is, only, occasionally, referred to by a very few writers,
amongst whom we may name Lütken2, who however, is
disposed to assign it, as being a young specimen of Solaster
papposus. Wyville Thomson3 speaks of a variety of
Solaster papposus having 10 rays, measuring 40 millimetres
in length between the extremities of two opposite rays; and
which is found in the cold area of the Farøe
Islands-Shetland channel, at a depth of 610 fathoms and in rather
considerable numbers.
Since our first paper appeared in Magazin for
Naturvidenskaberne1, in which, we assigned Solaster affinis. to be
an independent species; Messrs. Duncan and Sladen5 have
raised a doubt as to the individuality of this species.
Although these naturalists have assigned it to Solaster
papposus, they yet admit, that in a few points it differs
materially from that species, and, they therefore, suppose that
it may be considered to be a deep sea variety. Since our
first observations were made, we have obtained a more
abundant supply of material to work with, and, we have
consequently, been able to institute comparative examinations,
whilst, we have also more minutely examined the skeleton
parts, and have now arrived at the conclusion, that the
difference between Solaster affinis and Solaster papposus
is so great, and, also, so constant, that we must still affirm
the former to be a distinct species.
The proportion between the disk-radius and the
brachial radius is, as 1 :21/i. The largest specimens measured
60mm from the extremity of a ray, to the extremity of the
opposite ray. The smallest specimen, when measured in
the same manner, had a diameter of 61/2""n.
The disk is rather broad, and from it, emanate, 10
1 Prodromus descriptiouis animalium ab H. Martensis in orbis
terrarum circum-navigatione observatorium auctore J. F. Brandt.
Fase. 1. Petropoli 183"», pag. 71.
2 Oversigt over Grønlands Echinodermata af C. F. Lütken.
Kjøbenhavn 1857, pag. 43.
3 The depths of the sea by C. Wyville Thomson. Loudon 1847,
pag. 118.
4 Nyt Magazin for Naturvidenskaberne, 23 B. 3 H., pag. ."i7,
1877.
5 Duncan & Sladen. A Memoir on the Echinodermata of the
Arctic Sea to the West of Greenland 1881, pag. 39.
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