Acleistorhinidae

Acleistorhinidae is an extinct family of Late Carboniferous and Early Permian-aged (Moscovian to Kungurian stage) parareptiles. Acleistorhinids are most diverse from the Richards Spur locality of the Early Permian of Oklahoma. Richards Spur acleistorhinids include Acleistorhinus, Colobomycter, and possibly Delorhynchus and Feeserpeton. Other taxa include Carbonodraco from the Late Carboniferous of Ohio[2] and Karutia from the Early Permian of Brazil.[3] Acleistorhinidae is commonly considered a subgroup of lanthanosuchoids, related to taxa such as Chalcosaurus, Lanthaniscus and Lanthanosuchus.[4] However, a re-examination of parareptile phylogeny conducted by Cisneros et al. (2021) argued that lanthanosuchids were not closely related to acleistorhinids.[3]

Acleistorhinidae
Temporal range: Late Carboniferous and Early Permian, 306–271.6 Ma
Skull recontruction of Colobomycter pholeter
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: †Parareptilia
Order: †Procolophonomorpha
Superfamily: †Lanthanosuchoidea
Family: †Acleistorhinidae
Daly, 1969[1]
Genera

Acleistorhinidae is notable for being the oldest-known parareptilian clade. The family is diagnosed by the presence two synapomorphies: (1) the largest tooth is located far anteriorly on the maxilla; and (2) cranial ornamentation consists of sparse and shallow circular dimples.[5]

Diet

Two specimens of acleistorhinids described from the Richards Spur fissure-fill locality in Oklahoma have provided compelling evidence of the diet of acleistorhinids. One specimen, OMNH 73362, was later referred to Delorhynchus cifellii, a species named in 2014. The other specimen, OMNH 73364, has not been formally described. Fragments of arthropod cuticles are present in between the many palatal teeth of both skulls. The fragments in OMNH 73362 are thought to be the segments of an antenna, while the fragments in OMNH 73364 are thought to be part of a cercus.[6]

In acleistorhinids, the marginal teeth, which are small and recurved, are suggestive of an insectivorous diet, as they probably were used for gripping and piercing arthropod cuticle. The denticulated palate, with three pairs of tooth fields and smaller teeth in between the fields, is seen as an adaptation for holding food in the oral cavity.[6]

The teeth, which possess cutting edges, may also have been suitable for a carnivorous diet in which vertebrate flesh may have been consumed.[7] It is possible that acleistorhinids would have preyed on tetrapods that were small enough to swallow whole.[6] It is likely that one acleistorhinid, Colobomycter pholeter, specialized either on invertebrates with hard cuticles or on small tetrapods.[8]

References
  1. Daly, E. (1969). "A new procolophonoid reptile from the Early Permian of Oklahoma". Journal of Paleontology. 43 (3): 676–687.
  2. Arjan Mann; Emily J. McDaniel; Emily R. McColville; Hillary C. Maddin (2019). "Carbonodraco lundi gen et sp. nov., the oldest parareptile, from Linton, Ohio, and new insights into the early radiation of reptiles". Royal Society Open Science. 6 (11): Article ID 191191. doi:10.1098/rsos.191191. PMC 6894558. PMID 31827854.
  3. Cisneros, J. C.; Kammerer, C. F.; Angielczyk, K. D.; Fröbisch, J.; Marsicano, C.; Smith, R. M. H.; Richter, M. (2021). "A new reptile from the lower Permian of Brazil (Karutia fortunata gen. et sp. nov.) and the interrelationships of Parareptilia". Journal of Systematic Palaeontology. Online edition. doi:10.1080/14772019.2020.1863487.
  4. Marcello Ruta; Juan C. Cisneros; Torsten Liebrect; Linda A. Tsuji; Johannes Muller (2011). "Amniotes through major biological crises: faunal turnover among Parareptiles and the end-Permian mass extinction". Palaeontology. 54 (5): 1117–1137. doi:10.1111/j.1475-4983.2011.01051.x.
  5. Modesto, S. P. (1999). "Colobomycter pholeter from the Lower Permian of Oklahoma: a parareptile, not a protorothyrided". Journal of Vertebrate Paleontology. 19 (3): 466–472. doi:10.1080/02724634.1999.10011159.
  6. Modesto, S. P.; Scott, D. M.; Reisz, R. R. (2009). "Arthropod remains in the oral cavities of fossil reptiles support inference of early insectivory". Biology Letters. 5 (6): 838–840. doi:10.1098/rsbl.2009.0326. PMC 2827974. PMID 19570779.
  7. Freeman, P. W.; Lemen, C. (2006). "Puncturing ability of idealized canine teeth: edged and non-edged shanks". Journal of Zoology. 269: 51–56. doi:10.1111/j.1469-7998.2006.00049.x.
  8. Modesto, S. P.; Reisz, R. R. (2008). "New material of Colobomycter pholeter, a small parareptile from the Lower Permian of Oklahoma". Journal of Vertebrate Paleontology. 28 (3): 677–684. doi:10.1671/0272-4634(2008)28[677:NMOCPA]2.0.CO;2.


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