Mindeskrift i anledning af hundredaaret for Japetus Steenstrups fødsel / XXVI. The Copulatory organ (Petasma) of Sergestes Vigilax (Stimpson) H. J. H. by K. Stephensen / 4 (1914) Author: Hector Jungersen, Eugen Warming Table of Contents / Innehåll | << Previous | Next >>
	Project Runeberg | Catalog | Recent Changes | Donate | Comments? |

Full resolution (JPEG) - On this page / på denna sida - Sidor ...

<< prev. page << föreg. sida <<     >> nästa sida >> next page >>

Below is the raw OCR text from the above scanned image. Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan. Ser du något fel? Korrekturläs sidan nu!

This page has been proofread at least once. (diff) (history)
Denna sida har korrekturlästs minst en gång. (skillnad) (historik)

Senna’s figure (l. c. Pl. 11 fig. 8) shows a lobate appendage, but gives no details;
in the text he writes only (p. 295), “Nei maschi di 15 mm (in the explanation of
the piates is by a misprint written Mastigopus ♀),
il petasma è una breve lamina lobata (fig. 8)”.

Fig. 1.                Fig. 2.

In both my specimens it is very easy to see,
that already in the Mastigopus-stage the petasma
consists of the same elements as in the adult.
It is articulated to a little process in the pleopode.
On the edge towards the pleopode it bears a small
appendage, which becomes much larger in the
adult; a little more distally, but turned towards
the middle-line of the animal, another appendage
is fixed, joined to the corresponding one in the
petasma of the other side of the animal.
Apically the petasma bears 4 buds. Distinct
articulations I have not been able to see; but it is
possible that the narrow stalk in the specimen from st. 206 (fig. 1) is articulated to
the rest.

2. Petasma of the adult (fig. 3—6).

Fig. 3.                Fig. 4.                Fig. 5.                Fig. 6.

Fig. 3 shows the petasma of a young ♂, 16 mm, from st. 160 (35° 59’ N, 28° 14’ E),
1000 m wire out; fig. 4: 31 mm, st. 66 (36° 16’ N, 6° 52’ W), 1200 m wire out; figs.
5—6: respectively 35 and 26 mm, both from st. 66 (see above), 600 m wire out.

<< prev. page << föreg. sida <<     >> nästa sida >> next page >>