Aulacocerida is an order of primitive coleoid cephalopods, possibly derived from michelinoceraitids (Orthocerida) early in the Devonian, which in turn gave rise to the Belemnites. Aulococerids are characterized by a straight, slim, conical shell with a large living chamber, simple aperture. The protoconch (initial, embryonic chamber) is egg-shaped and separated from the phragnocone by a constriction. The siphucle is narrow and ventral, constricted at the septa and expanded in the middle of the chamber; necks are retrochoantiic, project backwards toward the apex. Nacre recovered from aulococerids as well as from belemnites resembles that found in recent Sepia and Spirula but differs from that of recent Nautilus.
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| - Aulacocerida (en)
- Aulacocèrides (ca)
- Aulacocerida (it)
- Aulacocerida (pl)
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| - Els aulacocèrides (Aulacocerida) són un ordre extint de cefalòpodes belemnoïdeus, que van viure entre el Devonià superior i Juràssic inferior. Van ser assignats a la subclasse Coleoidea a causa de les similituds en l'estructura del seu esquelet intern. (ca)
- Aulacocerida – rząd wymarłych zwierząt z grupy . (pl)
- Gli Aulacocerida (Stolley 1919) sono un ordine di cefalopodi, noti solo allo stato fossile. (it)
- Aulacocerida is an order of primitive coleoid cephalopods, possibly derived from michelinoceraitids (Orthocerida) early in the Devonian, which in turn gave rise to the Belemnites. Aulococerids are characterized by a straight, slim, conical shell with a large living chamber, simple aperture. The protoconch (initial, embryonic chamber) is egg-shaped and separated from the phragnocone by a constriction. The siphucle is narrow and ventral, constricted at the septa and expanded in the middle of the chamber; necks are retrochoantiic, project backwards toward the apex. Nacre recovered from aulococerids as well as from belemnites resembles that found in recent Sepia and Spirula but differs from that of recent Nautilus. (en)
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| - similar to siphuncle (en)
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| - Els aulacocèrides (Aulacocerida) són un ordre extint de cefalòpodes belemnoïdeus, que van viure entre el Devonià superior i Juràssic inferior. Van ser assignats a la subclasse Coleoidea a causa de les similituds en l'estructura del seu esquelet intern. (ca)
- Aulacocerida is an order of primitive coleoid cephalopods, possibly derived from michelinoceraitids (Orthocerida) early in the Devonian, which in turn gave rise to the Belemnites. Aulococerids are characterized by a straight, slim, conical shell with a large living chamber, simple aperture. The protoconch (initial, embryonic chamber) is egg-shaped and separated from the phragnocone by a constriction. The siphucle is narrow and ventral, constricted at the septa and expanded in the middle of the chamber; necks are retrochoantiic, project backwards toward the apex. Nacre recovered from aulococerids as well as from belemnites resembles that found in recent Sepia and Spirula but differs from that of recent Nautilus. Opinions vary as to whether aulococerids were endocochleate, having internal shells as with modern squid, or were ectocochleate, having external shells as with nautilods and ammonites. Naef (in Bandel 1985) thought of aulacocerids as slender squids that looked similar to recent ones; morphologically similar to belemnites on one hand and to orthocerids on the other, but with a mantle that completely covered the shell; making them endocochliate. Jeletzky (in Bandel 1985) considered that aulocerids were essentially ectocochleate and that they lacked a muscular mantle, the rostrum having been secreted by mantle flaps that could be folded over the chambered shell, but were not fused around it, and which could be withdrawn into the long living chamber. (en)
- Aulacocerida – rząd wymarłych zwierząt z grupy . (pl)
- Gli Aulacocerida (Stolley 1919) sono un ordine di cefalopodi, noti solo allo stato fossile. (it)
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