▁exam ined ▁long ▁b one ▁hist ological ▁data ▁and ▁concluded ▁that ▁the ▁di pl od oc id ▁M f N . R . 2 6 2 5 ▁we ighed ▁, ▁reached ▁sexual ▁m atur ity ▁at ▁ 2 3 ▁years ▁and ▁died ▁at ▁age ▁ 2 4 . ▁The ▁same ▁growth ▁model ▁indicated ▁that ▁the ▁di pl od oc id ▁M f N . R . N W 4 ▁we ighed ▁, ▁and ▁died ▁at ▁age ▁ 2 3 , ▁before ▁reaching ▁sexual ▁m atur ity . ▁ ▁Classification ▁ ▁Di pl od oc idae ▁was ▁the ▁third ▁name ▁given ▁to ▁what ▁is ▁now ▁recognized ▁as ▁the ▁single ▁family ▁of ▁long - ne ck ed , ▁wh ip - ta iled ▁sau rop ods . ▁Edward ▁Dr ink er ▁C ope ▁named ▁the ▁family ▁Am ph ico eli idae ▁in ▁ 1 8 7 8 ▁for ▁his ▁genus ▁Am ph ico el ias , ▁sometimes ▁considered ▁a ▁di pl od oc id . ▁However , ▁the ▁name ▁Am ph ico eli idae ▁did ▁not ▁come ▁into ▁wider ▁use ▁and ▁was ▁not ▁used ▁in ▁the ▁scientific ▁literature ▁after ▁ 1 8 9 9 , ▁making ▁it ▁a ▁nom en ▁ob lit um ▁(" f org ot ten ▁name ") ▁according ▁to ▁the ▁IC Z N , ▁prevent ing ▁it ▁from ▁disp la cing ▁the ▁name ▁Di pl od oc idae ▁as ▁a ▁senior ▁syn onym . ▁More ▁recent ▁studies ▁have ▁also ▁shown ▁that ▁Am ph ico el ias ▁itself ▁does ▁not ▁belong ▁to ▁this