Hapsidopareiidae

Hapsidopareiontidae is an extinct family of tuditanomorph microsaurs. Hapsidopareiontids are known from the Early Permian of the United States and possibly Germany and the Czech Republic.[1]

Hapsidopareiidae
Temporal range: Early Permian
Life restoration of Llistrofus
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subclass: †Lepospondyli
Order: †"Microsauria"
Suborder: †Tuditanomorpha
Family: †Hapsidopareiontidae
Daly, 1973

Hapsidopareiontids are characterized by a large temporal embayment near the cheek region in which the quadratojugal is greatly reduced or absent. Members of Ostodolepidae, another microsaur family, also possess temporal embayments, but they not as extensive as those of hapsidopareiontids, which extend into the skull roof. In hapsidopareiontids, the embayment may have provided space for an enlarged jaw adductor musculature, although certain characteristics of the skull do not support this idea. Hapsidopareion and Llistrofus both possess this embayment, but in Saxonerpeton, the temporal region is complete. The lack of a temporal embayment may exclude Saxonerpeton from Hapsidopareiontidae; Bolt and Rieppel (2009) considered Hapsidopareiontidae to include only Hapsidopareion and Llistrofus because of this.[2]

References
  1. Carroll, R. L.; Gaskill, P. (1978). "The Order Microsauria". Memoirs of the American Philosophical Society. 126.
  2. Bolt, J.R.; Rieppel, O. (2009). "The holotype skull of Llistrofus pricei Carroll and Gaskill, 1978 (Microsauria: Hapsidopareiontidae)". Journal of Paleontology. 83 (3): 471–483. doi:10.1666/08-076.1.


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