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Found 10 results

  1. here Sana KHEMIRI Sana, François J.Meunier , Michel LAURIN,Louise ZYLBERBERG Morphology and structure of the scales in the Gadiformes (Actinopterygii: Teleostei: Paracanthopterygii) and a comparison to the elasmoid scales of other Teleostei Cah. Biol. Mar. (2001) 42 : 345 - 362 DOI: 10.21411/CBM.A.FBAB4704 about 22 Mb CONTAINS cladograms (no pictorial outtakes possible,BTW,alas) When reputable vertebrate histologists get together,this is what you get
  2. true to scale

    here A scale atlas for common Mediterranean teleost fishes Zsuzsanna Bräger ,Timo Moritz Vertebrate zoology,66(3)/2-16
  3. gars

    WIL The Phylogeny and Biogeography of Fossil and Recent Gars (Actinopterygii: Lepisosteidae) E. O. Wiley University of Kansas museum of Natural History Misc.Publ. 64 1976 because it's E.O.Wiley: cladistics! HIGHLY recommended,it doesn''t get any better than this,but: the scans are good,but NOT top-notch about 11 MB fig 36:holotype skull of L.Indicus
  4. A highly diverse molluscan assemblage associated with eelgrass beds (Zostera marina L.) in the Alboran Sea: Micro-habitat preference, feeding guilds and biogeographical distribution José L. Rueda, Serge Gofas, Javier Urra and Carmen Salas Scientia Marina 73(4) December 2009, 679-700 ruedamollusca1137.pdf size :3.1 MB
  5. lucinids

    DIJK John.D.Taylor and Emily A.Glover Hanging on-lucinid bivalve survivors from the Paleocene and Eocene in the Western Indian Ocean(Bivalvia:Lucinidae) Zoosystema,2018/v.40-7 about 6.2 MB RECOMMENDED! New genus: Retrolucina(previously Eomiltha) http://zoobank.org/urn:lsid:zoobank.org:act:DAFC3EBA-0C19-4D63-8248-65A6F761670A
  6. A post by @ynot on STH teeth a while back peaked my interest in extant sawfish rostral teeth. The two extant sawfish genera are Pristis and Anoxypristis. There is only a single extant Anoxypristis species, Anoxypristis cuspidata (Knifetooth or Narrow Sawfish). There are 4 extant species of Pristis, Pristis clavata (Dwarf Sawfish), Pristis pectinata (Smalltooth Sawfish), Pristis pristis (Largetooth Sawfish), and Pristis zijsron (Green Sawfish) Last 2016. I borrowed a Pristis pectinata (Smalltooth Sawfish) rostrum from a friend so I could take pictures of it. This rostrum is from a sawfish caught off of the West coast of South Florida many years ago. If you would also like to see pictures of an Anoxypristis cuspidata rostrum check out my previous TFF post at the link below: http://www.thefossilforum.com/index.php?/topic/83865-extant-anoxypristis-cuspidata-knifetooth-or-narrow-sawfish-rostrum/&tab=comments#comment-895466 A Pristis pectinata rostrum is 21-30 % of total sawfish length. Pristis pectinata reach a total length of at least 554 cm with reports of 760 cm total length likely exaggerations. Last 2016. This rostrum is 10” long so it is from a juvenile sawfish. Pristis pectinata rostrums have 20-30 rostral teeth per side. This rostrum has 25/27 rostral teeth (Note some are damaged and/or missing) and is shown below in dorsal and ventral views: The basal view of the rostrum (20 mm by 5 mm) shows placoid scales and a thin layer of skin on the dorsal side and on the ventral side above the cartilage of the rostrum. Dorsal side, placoid scales covering the rostrum surface: Ventral Side, placoid scales covering the rostrum surface: Edit: Note I should have stated that these rostral teeth are smooth without a posterior groove. That is a rostral tooth trait of young Pristis pectinata sawfish. I didn't notice this until I just looked at the rostral teeth again after reading that young Pristis pectinata sawfish rostral teeth don't have the posterior groove in Last, White, de Carvalho, Seret, Stehmann, Naylor 2016 Rays of the World. The below picture shows a first anterior rostral tooth (10 mm) that is smooth without a posterior groove. Below are pictures of 8 different rostral teeth (5 mm to 12 mm vertical height) 6 rostral teeth dorsal views: 2 rostral teeth ventral views: Fossil Pristis cf lathami rostral tooth (2.25”) from the Eocene of Virginia for comparison to the extant Pristis teeth: Unfortunately now Pristis pectinata is a critically endangered species. Over fishing has not only drastically reduced their numbers but it has also drastically reduced the size of the largest members of the species. Populations are now fragmented and this species is considered to be extinct through most of its original range. Marco Sr.
  7. I have a large collection of extant shark and ray jaws that I use to understand tooth features. However, a number of tooth features, especially tooth root features, are really hard to see in jaws. So I’ve started to purchase (40+ species to date) and photograph individual teeth of a number of extant shark species. I’ll try to post some of the pictures (labial and lingual views) as I take them. This is another post of three extant species that most collectors don’t see. Centroscymnus coelioepis (Portuguese Dogfish Shark) Upper teeth (5 mm, 2 mm, & 4.5 mm): Lower teeth (4 mm, 5 mm & 7 mm): Scymnodon ringens (Knifetooth Dogfish Shark) Upper teeth (both 7 mm): Lower teeth (13 mm, 8 mm & 6 mm): Somniosus rostratus (Little Sleeper Shark) Upper teeth (5 mm, & 3 mm): Lower teeth (7 mm, 7 mm & 3.5 mm): Marco Sr.
  8. A post by YNOT @ynot on STH teeth peaked my interest in extant sawfish rostral teeth. The two extant sawfish genera are Pristis and Anoxypristis. There is only a single extant Anoxypristis species, Anoxypristis cuspidata (Knifetooth or Narrow Sawfish). There are 4 extant species of Pristis, Pristis clavata (Dwarf Sawfish), Pristis pectinata (Smalltooth Sawfish), Pristis pristis (Largetooth Sawfish), and Pristis zijsron (Green Sawfish) Last 2016. I borrowed an Anoxypristis cuspidata rostrum from a friend so I could take pictures of it. The rostrum is 18” long and is shown below in dorsal and ventral views: The basal view of the rostrum (35 mm by 13 mm) shows a thin layer of grey skin on the dorsal side and a thin layer of yellow skin on the ventral side above the white cartilage of the rostrum. Below are pictures of 8 different rostral teeth (6 mm to 14 mm vertical height) 6 teeth dorsal views: 2 teeth ventral views: Continued in next reply Marco Sr.
  9. I have a large collection of extant shark and ray jaws that I use to understand tooth features. However, a number of tooth features, especially tooth root features, are really hard to see in jaws. So I’ve started to purchase (40+ species to date) and photograph individual teeth of a number of extant shark species. I’ll try to post some of the pictures (labial and lingual views) as I take them. For this post I’ll post three extant species that most collectors don’t see. Glyphis gangeticus (Ganges Shark) Upper teeth (23 mm, 23 mm, & 21 mm): Lower teeth (22 mm & 21 mm): Somniosus microcephalus (Greenland Shark) Upper teeth (12 mm & 11mm): Lower teeth (14mm, 10 mm, & 12 mm): Dalatias licha (Kitefin Shark) Here is a cool lower symphyseal tooth (17 mm): Two other lower teeth (13 mm & 10 mm) Marco Sr.
  10. Here is a Hemipristis elongatus (Snaggletooth Shark) jaw that I recently acquired. The jaw is 5.25” wide and 3.25” inches high. Here is the overall jaw: To better see tooth details double clique the below pictures. If you mouse over the pictures you will see the file name which has additional positional information. Hemipristis elongatus jaws must be weak at the symphysis because a lot of the jaws for sale have distortion to both the upper and lower symphysis. The identification and number of tooth files discussed below are based upon Compagno 1988. Hemipristis elongatus have both upper jaw and lower jaw symphyseal and medial teeth files. Upper jaw symphysis: Upper jaw symphysis showing two files of symphyseal teeth (blue) and two files of medial teeth (red): Lower jaw symphysis: Lower jaw symphysis showing two files of symphyseal teeth (blue) and two files of medial teeth (red). Note a partial separation of the lower jaw at the symphysis moved the teeth relative to each other and made it very difficult to show them: Hemipristis elongatus jaws have one upper posterior tooth file on either side. This jaw did not have a posterior tooth file on the upper right side. Upper jaw left side posterior teeth: Hemipristis elongatus jaws have two lower posterior tooth files on either side. Lower jaw left and right side posterior teeth: Hemipristis elongatus jaws have two upper anterior tooth files on either side. Here are the upper jaw A1 and A2 teeth left and right side: Continued in the next reply: Marco Sr.
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