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From Saunders and Spinosa, 1978 (Sexual dimorphism in Nautilus from Palau):

 

5abd3d681461a_nautilusdimorphism.thumb.jpg.a1b3948e8b33373d94a4b2efe275ca77.jpg

 

5abd3d67711dd_nautilusdimorphismdesc..jpg.17b90f57445c6c59256db3f447a4bfb1.jpg

 

@Pilobolus @Auspex

"I am glad I shall never be young without wild country to be young in. Of what avail are forty freedoms without a blank spot on the map?"  ~Aldo Leopold (1887-1948) 

 

New Mexico Museum of Natural History Bulletins    

 

point.thumb.jpg.e8c20b9cd1882c9813380ade830e1f32.jpg research.jpg.932a4c776c9696d3cf6133084c2d9a84.jpg  RPV.jpg.d17a6f3deca931bfdce34e2a5f29511d.jpg  SJB.jpg.f032e0b315b0e335acf103408a762803.jpg  butterfly.jpg.71c7cc456dfbbae76f15995f00b221ff.jpg  Htoad.jpg.3d40423ae4f226cfcc7e0aba3b331565.jpg  library.jpg.56c23fbd183a19af79384c4b8c431757.jpg  OIP.jpg.163d5efffd320f70f956e9a53f9cd7db.jpg

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"I am glad I shall never be young without wild country to be young in. Of what avail are forty freedoms without a blank spot on the map?"  ~Aldo Leopold (1887-1948) 

 

New Mexico Museum of Natural History Bulletins    

 

point.thumb.jpg.e8c20b9cd1882c9813380ade830e1f32.jpg research.jpg.932a4c776c9696d3cf6133084c2d9a84.jpg  RPV.jpg.d17a6f3deca931bfdce34e2a5f29511d.jpg  SJB.jpg.f032e0b315b0e335acf103408a762803.jpg  butterfly.jpg.71c7cc456dfbbae76f15995f00b221ff.jpg  Htoad.jpg.3d40423ae4f226cfcc7e0aba3b331565.jpg  library.jpg.56c23fbd183a19af79384c4b8c431757.jpg  OIP.jpg.163d5efffd320f70f956e9a53f9cd7db.jpg

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  • 2 months later...

I was able to take some pictures of the specimen mentioned here...

5ab915d4d66c9_Angulithesfleuriausianus.thumb.jpg.23d549887f8ed6ea80c08357f47f6068.jpg.d5c343946d5d467265c077a36e71d922.jpg

 

...and figured I would add them here...

 

5b2af40ac37d3_IMG_3923(915x1280)(2).thumb.jpg.8b090865c15755c77533dcf556d8e862.jpg

 

5b2af403d7419_IMG_3926(913x1280).thumb.jpg.76c344719263f4d4e71a5c9ee61b6545.jpg

 

5b2af3f7bc22f_IMG_3927(912x1280).thumb.jpg.0a2c8cceda680ad30059c16688d0cd37.jpg

 

... :) .

"I am glad I shall never be young without wild country to be young in. Of what avail are forty freedoms without a blank spot on the map?"  ~Aldo Leopold (1887-1948) 

 

New Mexico Museum of Natural History Bulletins    

 

point.thumb.jpg.e8c20b9cd1882c9813380ade830e1f32.jpg research.jpg.932a4c776c9696d3cf6133084c2d9a84.jpg  RPV.jpg.d17a6f3deca931bfdce34e2a5f29511d.jpg  SJB.jpg.f032e0b315b0e335acf103408a762803.jpg  butterfly.jpg.71c7cc456dfbbae76f15995f00b221ff.jpg  Htoad.jpg.3d40423ae4f226cfcc7e0aba3b331565.jpg  library.jpg.56c23fbd183a19af79384c4b8c431757.jpg  OIP.jpg.163d5efffd320f70f956e9a53f9cd7db.jpg

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  • 4 months later...

In my search for some confirmation on Angulithes as an identification for this Nautilus specimen, I reached out to RNDr. Jiří Frank, Ph.D. [National Museum (Prague)] regarding it and he had this to say...

 

"...Could you please provide me a photo of dorsal and ventral view with measure? There is a close connection between genera Angulithes and Pseudocenoceras, but also with some representatives of very morphologically heterogeneous genus Cymatoceras. If we will be not only depending on the morphological features (often affected by deformations), this genus will be not valid any-more. But this is for long discussion and in my opinion, the shell surface (cask) morphology should not be the major taxonomic feature for determination. 

 

But back to your specimen, the combination of morphological features as shape of ventral size, suture line, size of phragmocone chambers are the major distinguish between two above mentioned genera. Indeed also the position of siphuncle, but I guess it is not preserved on this specimen. If you compare the whorl shape, it is important to also compare  the size of the shale or determine the ontogenetic stadium, because it change during the ontogeny. So there is obvious morphological variation in some features during the ontogeny, specially the whorl shape on section. On the first glance Angulithes is a good direction..."

 

... :) ...onward.

 

 

"I am glad I shall never be young without wild country to be young in. Of what avail are forty freedoms without a blank spot on the map?"  ~Aldo Leopold (1887-1948) 

 

New Mexico Museum of Natural History Bulletins    

 

point.thumb.jpg.e8c20b9cd1882c9813380ade830e1f32.jpg research.jpg.932a4c776c9696d3cf6133084c2d9a84.jpg  RPV.jpg.d17a6f3deca931bfdce34e2a5f29511d.jpg  SJB.jpg.f032e0b315b0e335acf103408a762803.jpg  butterfly.jpg.71c7cc456dfbbae76f15995f00b221ff.jpg  Htoad.jpg.3d40423ae4f226cfcc7e0aba3b331565.jpg  library.jpg.56c23fbd183a19af79384c4b8c431757.jpg  OIP.jpg.163d5efffd320f70f956e9a53f9cd7db.jpg

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