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of this species, which resembles a hoof. The studied specimens are well-preserved and represent numerous individuals of various growth stages, allowing an
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was described in 2020 by paleontologists
Timothy A. M. Ewin and Andrew S. Gale based on material originating from the Taba Starfish Bed of the
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were first described by paleontologists Daniel B. Blake and Robert Reid, III in a 1998 publication describing some
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330:. The authors determined that over 50 specimens (some complete and other fragmentary) originating from the
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424:"Some Albian (Cretaceous) asteroids (Echinodermata) from Texas and their paleobiological implications"
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481:"Asteroids (Echinodermata) from the Barremian (Lower Cretaceous) of the Agadir Basin, west Morocco"
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period. It was first described in 1998, and two species are currently assigned to it. The
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honors Colin
Sumrall, who discovered and prepared some of the specimens, including the
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in
Morocco and purchased from commercial fossil collectors. This species was named
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at Waco Dam Quarry was designated as the holotype, and was placed in the
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366:. Some additional fragments from the same locality and from the
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358:. A complete specimen (1786TXI) found in deposits of the
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Ewin, Timothy A. M.; Gale, Andrew S. (September 2020).
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represented a new genus and species which they named
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393:, the specific name meaning "large hoof" in
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422:Blake, Daniel B.; Reid, Robert (1998).
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298:, and fossils of an earlier species,
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397:and referencing the large terminal
674:. You can help Knowledge (XXG) by
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346:, a star in the constellation
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721:Fossil taxa described in 1998
746:Prehistoric Asteroidea stubs
731:Cretaceous genus extinctions
736:Prehistoric starfish genera
326:fossils from north-central
270:which lived in the western
16:Extinct genus of starfishes
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314:The fossilized remains of
450:10.1017/S002233600002429X
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120:Scientific classification
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485:Journal of Paleontology
429:Journal of Paleontology
266:is an extinct genus of
726:Cretaceous echinoderms
670:-related article is a
230:Blake & Reid, 1998
209:Blake & Reid, 1998
620:Paleobiology Database
387:Taboulouart Formation
364:Texas Memorial Museum
302:, have been found in
252:Ewin & Gale, 2020
405:series to be shown.
377:A second species of
310:Discovery and naming
32:Barremian–Cenomanian
497:10.1017/jpa.2020.20
442:1998JPal...72..512B
391:Alkaidia megaungula
370:were designated as
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666:This prehistoric
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607:Open Tree of Life
521:Taxon identifiers
368:Paw Paw Formation
360:Del Rio Formation
336:Alkaidia sumralli
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226:Alkaidia sumralli
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491:(5): 931–954.
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282:stages of the
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741:Forcipulatida
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300:A. megaungula
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676:expanding it
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340:generic name
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288:type species
272:Tethys Ocean
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216:Type species
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553:Wikispecies
403:ontogenetic
342:references
292:A. sumralli
113:A. sumralli
715:Categories
668:asteroidea
544:Q107274571
409:References
348:Ursa Major
284:Cretaceous
280:Cenomanian
167:Asteroidea
111:Fossil of
505:0022-3360
466:131483454
383:Barremian
372:paratypes
276:Barremian
274:from the
268:sea stars
143:Kingdom:
137:Eukaryota
559:Alkaidia
538:Wikidata
529:Alkaidia
379:Alkaidia
356:holotype
324:starfish
316:Alkaidia
263:Alkaidia
204:Alkaidia
183:Family:
153:Phylum:
147:Animalia
133:Domain:
25:Alkaidia
638:1316616
612:4146875
599:1340050
586:4872816
458:1306650
438:Bibcode
399:ossicle
304:Morocco
196:Genus:
173:Order:
163:Class:
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385:-aged
344:Alkaid
338:. The
322:-aged
320:Albian
633:WoRMS
625:77394
594:IRMNG
573:7NNKR
462:S2CID
454:JSTOR
395:Greek
328:Texas
296:Texas
672:stub
581:GBIF
501:ISSN
37:PreꞒ
568:CoL
493:doi
446:doi
278:to
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244:†
223:†
200:†
187:†
92:N
82:K
77:J
72:T
67:P
62:C
57:D
52:S
47:O
42:Ꞓ
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