31. The species is related to " Carodista gracilis ", but can be distinguished by the male genitalia. 32. They range in length from about in " Hymenogadus gracilis " to in " Albatrossia pectoralis ". 33. In particular, the peristome is wider than in " N . gracilis " and has scattered red bands. 34. It is known only from Lake Okeechobee in Florida, and is probably conspecific with " Philobdella gracilis ". 35. This hybrid has the growth habit of " N . gracilis ", with the stem scrambling along the ground. 36. It is thought that " S . gracilis " had an average body mass of around 2.1 kilograms. 37. This morphology unites the North American and European specimens of " Erpetosuchus " with " Parringtonia gracilis ". 38. The thigh adductors have their origins on the semitendinosus, gracilis reaches beyond the knee to their common insertion on the tibia. 39. This nudibranch is similar in appearance to " Flabellina gracilis " and many other " Flabellina " species. 40. It prefers substantially more solid substrates than the sand dunes occupied by its close relatives " P . gracilis ".
